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diff --git a/dmake/man/dmake.tf b/dmake/man/dmake.tf deleted file mode 100644 index 562e872120ae..000000000000 --- a/dmake/man/dmake.tf +++ /dev/null @@ -1,3480 +0,0 @@ -.\" Copyright (c) 1990,...,1995 Dennis Vadura, All rights reserved. -.\" -.\" You must use groff to format this man page!!! -.\" -.ds TB "0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.5i +0.5i +2.0i -.de Ip -.sp \\n[PD]u -.nf -.nr dmake-indent \w@\\$1 @u -.IP "\\$1" \\n[dmake-indent]u -\\$2 -.. -.de Is -.nr dmake-indent \w@\\$1@u -.nf -.. -.de Ii -.PD 0 -.IP "\\$1" \\n[dmake-indent]u -.it 1 PD -.. -.TH DMAKE 1 "2008-02-26" "Dmake Version 4.12" -.SH NAME -\fBdmake\fR \- maintain program groups, or interdependent files -.SH SYNOPSIS -.nh -.B dmake -[\-P#] [\-{f|C|K} file] [\-{w|W} target ...] -[macro[[!][*][+][:]]=\fIvalue\fP ...] -[\-ABcdeEghiknpqrsStTuVxX] [\-v[cdfimrtw]] [\-m[trae]] [target ...] -.hy 14 -.SH DESCRIPTION -.PP -.B dmake -is a re-implementation of the UNIX Make utility with significant enhancements. -.B dmake -executes commands found in an external file called a -.I makefile -to update one or more target names. -Each target may depend on zero or more prerequisite targets. -If any of the target's prerequisites is newer than the target or if the target -itself does not exist, then -.B dmake -will attempt to make the target. -.PP -If no -.B \-f -command line option is present then -.B dmake -searches for an existing -.I makefile -from the list of prerequisites specified for the special target \fI.MAKEFILES\fR -(see the STARTUP section for more details). -If "\-" is the name of the file specified to the -.B \-f -flag then \fBdmake\fR uses standard input as the source of the makefile text. -.PP -Any macro definitions (arguments with embedded "=" -signs) that appear on the command line are processed first -and supercede definitions for macros of the same name found -within the makefile. In general it is impossible for definitions found -inside the makefile to redefine a macro defined on the command line, see the -MACROS section for exceptions. -.PP -If no -.I target -names are specified on the command line, then \fBdmake\fR uses the first -non-special target found in the makefile as the default target. -See the -.B "SPECIAL TARGETS" -section for the list of special targets and their function. -Makefiles written for most previous -versions of -.I Make -will be handled correctly by -.B dmake. -Known differences between \fBdmake\fR and other versions of make -are discussed in the -.B COMPATIBILITY -section found at the end of this document. -.B dmake -returns 0 if no errors were detected and a non-zero result if an error -occurred. -.SH OPTIONS -.IP "\fB\-A\fR" -Enable AUGMAKE special inference rule transformations -(see the "PERCENT(%) RULES" and "AUGMAKE META RULES" sections), these are -set to off by default. -.IP "\fB\-B\fR" -Enable the use of spaces instead of <tabs> to begin recipe lines. -This flag equivalent to the .NOTABS special macro and is further described -below. -.IP "\fB\-c\fR" -Use non-standard comment stripping. If you specify \fB\-c\fP then -.B dmake -will treat any \fB#\fP character as a start of comment character wherever it -may appear unless it is escaped by a \e. -.IP "\fB\-C [+]file\fR" -This option writes to \fIfile\fP a copy of standard output and -standard error from any child processes and from the -.B dmake -process itself. If you specify a \fB+\fP prior to the file name then -the text is appended to the previous contents of \fIfile\fP. -This option is active in the MSDOS implementation only and is ignored -by non-MSDOS versions of -.B dmake. -.IP "\fB\-d\fR" -Disable the use of the directory cache. Normally \fBdmake\fP caches directories -as it checks file timestamps. Giving this flag is equivalent to the -\&.DIRCACHE attribute or macro being set to \fIno\fP. -.IP "\fB\-E\fR" -Read the environment and define all strings of the -form '\fBENV\-VAR\fP=\fIevalue\fP' -defined within as macros whose name is \fBENV\-VAR\fP, -and whose value is '\fIevalue\fP'. -The environment is processed prior to processing the user -specified makefile thereby allowing definitions in the makefile to override -definitions in the environment. -.IP "\fB\-e\fR" -Same as \-E, except that the environment is processed after the -user specified makefile has been processed -(thus definitions in the environment override definitions in the makefile). -The \-e and \-E options are mutually exclusive. -If both are given the latter takes effect. -.IP "\fB\-f file\fR" -Use \fBfile\fR as the source for the makefile text. -Only one \fB\-f\fR option is allowed. -.IP "\fB\-g\fR" -Globally disable group recipe parsing, equivalent to the .IGNOREGROUP -attribute or macro being set to \fIyes\fP at the start of the makefile. -.IP "\fB\-h\fR" -Print the command summary for \fBdmake\fR. -.IP "\fB\-i\fR" -Tells \fBdmake\fR to ignore errors, and continue making other targets. -This is equivalent to the .IGNORE attribute or macro. -.IP "\fB\-K file\fR" -Turns on \fB.KEEP_STATE\fP state tracking and tells \fBdmake\fP to use -\fIfile\fP as the state file. -.IP "\fB\-k\fR" -Causes \fBdmake\fR to ignore errors caused by command execution and to make -all targets not depending on targets that could not be made. -Ordinarily \fBdmake\fR stops after a command returns a non-zero status, -specifying \fB\-k\fR causes \fBdmake\fR to ignore the error -and continue to make as much as possible. -.IP "\fB\-m[trae]\fR" -Measure timing information. Print the time when targets and/or recipes -are started and finished to stdout. The following format is used: -.IP "" -\fB{s|e} {target|recipe} time maketarget\fP -.IP "" -\fBs\fP or \fBe\fP stands for started or ended, \fBtarget\fP or -\fBrecipe\fP denotes if this line refers to the whole target or a -recipe. \fBtime\fP is displayed in Unix time format, i.e. the number -of seconds since an epoch. (Since 1970-01-01T00:00:00Z). \fBmaketarget\fP -obviously represents the target the timing information is given for. -The optional flags \fB[trae]\fP can be used to change the information that -is displayed. If no optional flags are given only the \fBt\fP flag -is assumed to be selected, ie. \fB\-mt\fP. The optional flags stand for: -.RS -.IP "\fBt\fP" -Display the start and end time of each target. -.IP "\fBr\fP" -Display the start and end time of each recipe. -.IP "\fBa\fP" -Display the target as an absolute path, i.e. prepend the current working -directory. -.IP "\fBe\fP" -Also display the start and end time of the \fB$(shell command)\fP function -(aka. shell escape) macros. -.RE -.IP "\fB\-n\fR" -Causes \fBdmake\fR to print out what it would have executed, -but does not actually execute the commands. A special check is made for -the string "$(MAKE)" inside a recipe line, if it is found, -the line is expanded and invoked, thereby enabling recursive makes to give a -full description of all that they will do. -This check is disabled inside group recipes. -.IP "\fB\-p\fR" -Print out a version of the digested makefile in human readable form. -(useful for debugging, but cannot be re-read by \fBdmake\fP) -.IP "\fB\-P#\fR" -On systems that support multi-processing cause \fBdmake\fP to use \fI#\fP -concurrent child processes to make targets. -See the "MULTI PROCESSING" section for more information. -.IP "\fB\-q\fR" -Check and see if the target is up to date. Exits with code 0 if up to date, -1 otherwise. -.IP "\fB\-r\fR" -Tells \fBdmake\fR not to read the initial startup makefile, see STARTUP -section for more details. -.IP "\fB\-s\fR" -Tells \fBdmake\fR to do all its work silently and not echo the commands it is -executing to stdout (also suppresses warnings). -This is equivalent to the .SILENT attribute or macro. -.IP "\fB\-S\fR" -Force sequential execution of recipes on architectures which support -concurrent makes. For backward compatibility with old makefiles that have -nasty side-effect prerequisite dependencies. (Implies -P1) -.IP "\fB\-t\fR" -Causes \fBdmake\fR to touch the targets and bring them up to date -without executing any commands. -Note that targets will not be created if they do not already exist. -.IP "\fB\-T\fR" -Tells \fBdmake\fP to not perform transitive closure on the inference graph. -.IP "\fB\-u\fR" -Force an unconditional update. (ie. do everything that would -be done if everything that a target depended on was out of date) -.IP "\fB\-v[cdfimrtw]\fR" -Verbose flag, when making targets print to stdout what we are going to make -and what we think its time stamp is. The optional flags \fB[cdfimrtw]\fP can be -used to restrict the information that is displayed. In the absence of any -optional flags all are assumed to be given (ie. \fB\-v\fP is equivalent to -\fB\-vcdfimrtw\fP). The meanings of the optional flags are: -.RS -.IP "\fBc\fP" -Notify of directory cache operations only. -.IP "\fBd\fP" -Notify of change directory operations only. -.IP "\fBf\fP" -Notify of file I/O operations only. -.IP "\fBi\fP" -Notify of inference algorithm operation only. -.IP "\fBm\fP" -Notify of target update operations only. -.IP "\fBr\fP" -Force output of recipe lines, warnings and executed commands. This switch -is useful when debugging makefiles that disable the output using the @ -or @@ property for recipe lines or the .SILENT target/attribute. -It also overrides the -s flag. -.IP "\fBt\fP" -Keep any temporary files created; normally they are automatically deleted. -.IP "\fBw\fP" -Notify of non-essential warnings (these are historical). -.RE -.IP "\fB\-V\fR" -Print the version of \fBdmake\fR, and values of builtin macros. -.IP "\fB\-W target\fR" -Run \fBdmake\fP pretending that \fItarget\fP is out of date. -.IP "\fB\-w target\fR" -\fIWhat if?\fP Show what would be made if \fItarget\fP were out of date. -.IP "\fB\-x\fR" -Upon processing the user makefile export all non-internally defined macros -to the user's environment. This option together with the \-e option -allows SYSV AUGMAKE recursive makes to function as expected. -.IP "\fB\-X\fR" -Inhibit the execution of \fB#!\fP lines found at the beginning of a makefile. -The use of this flag prevents non-termination of recursive make invocations. -.SH INDEX -Here is a list of the sections that follow and a short description of each. -Perhaps you won't have to read the entire man page to find -what you need. -.IP \fBSTARTUP\fP 1.9i -Describes \fBdmake\fP initialization. -.IP \fBSYNTAX\fP 1.9i -Describes the syntax of makefile expressions. -.IP \fBATTRIBUTES\fP 1.9i -Describes the notion of attributes and how they are used when -making targets. -.IP \fBMACROS\fP 1.9i -Defining and expanding macros. -.IP "\fBRULES AND TARGETS" 1.9i -How to define targets and their prerequisites. -.IP \fBRECIPES\fP 1.9i -How to tell \fBdmake\fP how to make a target. -.IP "\fBBUILTIN COMMANDS\fP" 1.9i -Internal dmake commands. -.IP "\fBTEXT DIVERSIONS\fP" 1.9i -How to use text diversions in recipes and macro expansions. -.IP "\fBVIRTUAL TARGETS\fP" 1.9i -Targets that only enforce dependencies, but which can not create a target file. -.IP "\fBSPECIAL TARGETS\fP" 1.9i -Some targets are special. -.IP "\fBSPECIAL MACROS\fP" 1.9i -Macros used by \fBdmake\fP to alter the processing of the makefile, -and those defined by \fBdmake\fP for the user. -.IP "\fBCONTROL MACROS\fP" 1.9i -Itemized list of special control macros. -.IP "\fBRUNTIME MACROS\fP" 1.9i -Discussion of special run-time macros such as $@ and $<. -.IP "\fBFUNCTION MACROS\fP" 1.9i -Description of functional macros. -.IP "\fBCONDITIONAL MACROS\fP" 1.9i -Target specific conditional macros. -.IP "\fBDYNAMIC PREREQUISITES\fP" 1.9i -Processing of prerequisites which contain macro expansions in their name. -.IP "\fBBINDING TARGETS\fP" 1.9i -The rules that \fBdmake\fP uses to bind -a target to an existing file in the file system. -.IP "\fBPERCENT(%) RULES\fP" 1.9i -Specification of recipes to be used by the inference algorithm. -.IP "\fBMAKING INFERENCES\fP" 1.9i -The rules that \fBdmake\fP uses when inferring how to make a target which -has no explicit recipe. This and the previous section are really a single -section in the text. -.IP "\fBAUGMAKE META RULES\fP" 1.9i -A subclass of the \fBPERCENT(%) RULES\fP. -.IP "\fBMAKING TARGETS\fP" 1.9i -How \fBdmake\fP makes targets other than libraries. -.IP "\fBMAKING LIBRARIES\fP" 1.9i -How \fBdmake\fP makes libraries. -.IP "\fBKEEP STATE\fP" 1.9i -A discussion of how .KEEP_STATE works. -.IP "\fBMULTI PROCESSING\fP" 1.9i -Discussion of \fBdmake's\fP parallel make facilities for architectures that -support them. -.IP "\fBCONDITIONALS\fP" 1.9i -Conditional expressions which control the processing of the makefile. -.IP "\fBEXAMPLES\fP" 1.9i -Some hopefully useful examples. -.IP "\fBCOMPATIBILITY\fP" 1.9i -How \fBdmake\fP compares with previous versions of make. -.IP "\fBLIMITS\fP" 1.9i -Limitations of \fBdmake\fP. -.IP \fBPORTABILITY\fP 1.9i -Comments on writing portable makefiles. -.IP \fBFILES\fP 1.9i -Files used by \fBdmake\fP. -.IP "\fBSEE ALSO\fP" 1.9i -Other related programs, and man pages. -.IP "\fBAUTHOR\fP" 1.9i -The guy responsible for this thing. -.IP \fBBUGS\fP 1.9i -Hope not. -.SH STARTUP -When -.B dmake -begins execution it first processes the command line and then processes -an initial startup-makefile. -This is followed by an attempt to locate and process a user supplied makefile. -The startup file defines the default values of all required control macros -and the set of default rules for making targets and inferences. -When searching for the startup makefile, -.B dmake -searches the following locations, in the order specified, -until a startup file is located: -.LP -.RS -.IP 1. -The location given as the value of the macro -MAKESTARTUP defined on the command line. -.IP 2. -The location given as the value of the environment variable MAKESTARTUP -defined in the current environment. -.IP 3. -The location given as the value of the macro -MAKESTARTUP defined internally within \fBdmake\fP. In this version, the -internal definition of MAKESTARTUP is "$(DMAKEROOT)/startup.mk", so you -can set the environment variable DMAKEROOT to the location of your startup -directory. -.sp -If DMAKEROOT is not changed, for native Windows dmake versions its value -defaults to "$(ABSMAKECMD:d)startup" (see definition of ABSMAKECMD for -details). -For unix like versions build with the autotools build system it defaults -to the value of "${prefix}/share/startup" at build time. The actual value, -usually something like /usr/local/share/startup can be checked with the \-V -command line switch. -.RE -.LP -The above search is disabled by specifying the \-r option on the command line. -An error is issued if a startup makefile cannot be found and the \-r -option was not specified. -A user may substitute a custom startup file by defining -the MAKESTARTUP environment variable or by redefining the -MAKESTARTUP macro on the command line. -To determine where -.B dmake -looks for the default startup file, check your environment or issue the command -\fI"dmake \-V"\fP. -.PP -A similar search is performed to locate a default user makefile when no -\fB\-f\fP command line option is specified. -By default, the prerequisite list of the special target .MAKEFILES -specifies the names of possible makefiles and the search order that -\fBdmake\fP should use to determine if one exists. -A typical definition for this target is: -.RS -.sp -\&.MAKEFILES : makefile.mk Makefile makefile -.sp -.RE -\fBdmake\fP will first look for makefile.mk and then the others. -If a prerequisite -cannot be found \fBdmake\fP will try to make it before going on to the next -prerequisite. For example, makefile.mk can be checked out of an RCS file -if the proper rules for doing so are defined in the startup file. -.PP -If the first line of the user makefile is of the form: -.RS -.sp -#!command command_args -.sp -.RE -then \fBdmake\fP will expand and run the command prior to reading any -additional input. If the return code of the command is zero then \fBdmake\fP -will continue on to process the remainder of the user makefile, if the return -code is non-zero then dmake will exit. -.PP -\fBdmake\fP builds the internal dependency graph as it parses a user specified -makefile. The graph is rooted at the special target \fB.ROOT\fP. .ROOT is the -top level target that dmake builds when it starts to build targets. All user -specified targets (those from the command line or taken as defaults from -the makefile) are made prerequisites of the special target \fB.TARGETS\fP. -\fBdmake\fP by default creates the relationship that .ROOT depends on .TARGETS -and as a result everything is made. This approach allows the user to customize, within -their makefile, the order and which, target, is built first. For example the -default makefiles come with settings for .ROOT that specify: -.sp -.RS -\&.ROOT .PHONY .NOSTATE .SEQUENTIAL : .INIT .TARGETS .DONE -.RE -.sp -with .INIT and .DONE defined as: -.sp -.RS -\&.INIT .DONE .PHONY:; -.RE -.sp -which nicely emulates the behaviour of Sun's make extensions. The building of -\&.ROOT's prerequisites is always forced to be sequential. However, this -definition is trivially changed by supplying the definition: -.sp -.RS -\&.ROOT : .TARGETS -.RE -.sp -which skips the preamble and postamble phases of building .TARGETS. -.PP -.B Please note -that even though .INIT and .DONE are special exceptions, see section SPECIAL -TARGETS, the use of self defined targets starting with `.' should be avoided -as they would be handled as .<suffix> meta targets. The target names _INIT -and _DONE for example would work equally well without the .<suffix> -drawback. -.SH SYNTAX -This section is a summary of the syntax of makefile statements. -The description is given in a style similar to BNF, where { } enclose -items that may appear zero or more times, and [ ] enclose items that -are optional. Alternative productions for a left hand side are indicated -by '\(->', and newlines are significant. All symbols in \fBbold\fP type -are text or names representing text supplied by the user. -.sp 2 -.RS -.Ip "Makefile" "\(-> { Statement }" -.Ip "Statement" "\(-> Macro-Definition" -\(-> Conditional-Macro-Definition -\(-> Conditional -\(-> Rule-Definition -\(-> Attribute-Definition -.Ip "Macro-Definition" "\(-> \fBMACRO = LINE\fP" -\(-> \fBMACRO [\fB!\fR]*= LINE\fP -\(-> \fBMACRO [\fB!\fR]:= LINE\fP -\(-> \fBMACRO [\fB!\fR]*:= LINE\fP -\(-> \fBMACRO [\fB!\fR]+= LINE\fP -\(-> \fBMACRO [\fB!\fR]+:= LINE\fP -.Ip "Conditional-Macro-Definition \(-> " "\fBTARGET\fP ?= Macro-Definition" -.Ip "Conditional \(-> " "\fB\&.IF\fR expression" - Makefile -[ \fB.ELIF\fR expression - Makefile ] -[ \fB.ELSE\fR - Makefile ] -\fB\&.END\fR -.Ip "expression" "\(-> \fBLINE\fR" -\(-> \fBSTRING\fR -\(-> expression \fB==\fR expression -\(-> expression \fB!=\fR expression -\(-> expression \fB<=\fR expression -\(-> expression \fB>=\fR expression -\(-> \fB(\fR expression \fB)\fR -\(-> expression \fB||\fR expression -\(-> expression \fB&&\fR expression -.Ip "Rule-Definition \(-> " "target-definition" - [ recipe ] -.PP -target-definition \(-> targets [attrs] op { \fBPREREQUISITE\fP } [\fB;\fR rcp-line] -.Ip "targets" "\(-> target { targets }" -\(-> \fB"\fRtarget\fB"\fR { targets } -.Ip "target" "\(-> special-target" -\(-> \fBTARGET\fR -.Ip "attrs" "\(-> attribute { attrs }" -\(-> \fB"\fRattribute\fB"\fR { attrs } -.Ip "op" "\(-> \fB:\fR { modifier }" -.Ip "modifier" "\(-> \fB:\fR" -\(-> \fB^\fR -\(-> \fB!\fR -\(-> \fB\-\fR -\(-> \fB|\fR -.Ip "recipe" "\(-> { \fBTAB\fR rcp-line }" -\(-> [\fB@\fR[\fB@\fR]][\fB%\fR][\fB\-\fR] \fB[ -.Is "recipe \(-> " -.Ii " " - \fR{ \fBLINE\fR } -.Ii " " -\fB]\fR -.Ip "rcp-line" "\(-> [\fB@\fR[\fB@\fR]][\fB%\fR][\fB\-\fR][\fB+\fR] \fBLINE\fR" -.Ip Attribute-Definition "\(-> attrs \fB:\fR targets" -.Ip attribute "\(-> \fB.EPILOG\fR" -\(-> \fB.ERRREMOVE\fR -\(-> \fB.EXECUTE\fR -\(-> \fB.GROUP\fR -\(-> \fB.IGNORE\fR -\(-> \fB.IGNOREGROUP\fR -\(-> \fB.LIBRARY\fR -\(-> \fB.MKSARGS\fR -\(-> \fB.NOINFER\fR -\(-> \fB.NOSTATE\fR -\(-> \fB.PHONY\fR -\(-> \fB.PRECIOUS\fR -\(-> \fB.PROLOG\fR -\(-> \fB.SETDIR=\fIpath\fP\fR -\(-> \fB.SILENT\fR -\(-> \fB.SEQUENTIAL\fR -\(-> \fB.SWAP\fR -\(-> \fB.USESHELL\fR -\(-> \fB.SYMBOL\fR -\(-> \fB.UPDATEALL\fR -\(-> \fB.WINPATH\fR -.Ip "special-target" "\(-> \fB.ERROR\fR" -\(-> \fB.EXIT\fR -\(-> \fB.EXPORT\fR -\(-> \fB.GROUPEPILOG\fR -\(-> \fB.GROUPPROLOG\fR -\(-> \fB.IMPORT\fR -\(-> \fB.INCLUDE\fR -\(-> \fB.INCLUDEDIRS\fR -\(-> \fB.MAKEFILES\fR -\(-> \fB.REMOVE\fR -\(-> \fB.ROOT\fR -\(-> \fB.SOURCE\fR -\(-> \fB.SOURCE.\fIsuffix\fR -\(-> \fB.SUFFIXES (deprecated)\fR -\(-> \fB.TARGETS\fR -\(-> \fB.INIT\fR -\(-> \fB.DONE\fR -\(-> .\fIsuffix\fR -\(-> .\fIsuffix1\fR.\fIsuffix2\fR -.fi -.RE -.sp 1 -.PP -Where, \fBTAB\fP represents a <tab> character, \fBSTRING\fP represents an -arbitrary sequence of characters, and -\fBLINE\fP represents a -possibly empty sequence of characters terminated by a non-escaped -(not immediately preceded by a backslash '\e') new-line character. -\fBMACRO\fP, \fBPREREQUISITE\fP, -and \fBTARGET\fP each represent a string of characters not -including space or tab which respectively form the name of a macro, -prerequisite or target. -The name may itself be a macro expansion expression. -A \fBLINE\fP can be continued over several physical lines by terminating it with -a single backslash character. Comments are initiated by the -pound \fB#\fR character and extend to the end of line. -All comment text is discarded, a '#' may be placed into the makefile text -by escaping it with '\e' (ie. \e# translates to # when it is parsed). -An exception to this occurs when a # is seen inside -a recipe line that begins with a <tab> or is inside a group recipe. -If you specify the \fB\-c\fP command line switch then this behavior is -disabled and -.B dmake -will treat all # characters as start of comment indicators unless they -are escaped by \e. -A set of continued lines may be commented out by placing a single # at the -start of the first line. -A continued line cannot span more than one makefile. -.PP -\fBwhite space\fP is defined to be any combination of -<space>, <tab>, and the sequence \e<nl> when \e<nl> is used to terminate a -LINE. \fBNote\fP the special treatment of \e<nl> in macro definion and recipe -lines below. -When processing \fBmacro definition\fP lines, -any amount of white space is allowed on either side of the macro operator -and white space is stripped from both before and after the macro -value string. A \e<nl> sequence in a macro definition is deleted from the -macro value before assigning this value. -During \fBrecipe expansion\fP the sequence \e<nl> is treated as white space -but is deleted from the final recipe string. -You must escape the \e<nl> with another \e in order to get a \e at the end -of a recipe or macro definition line. -.PP -When processing \fBtarget\fP definition lines, -the recipe for a target must, in general, follow the first definition -of the target (See the RULES AND TARGETS section for an exception), and -the recipe may not span across multiple makefiles. -Any targets and prerequisites found on a target definition line are taken -to be white space separated tokens. -The rule operator (\fIop\fP in SYNTAX section) is also considered -to be a token but does not require -white space to precede or follow it. Since the rule operator begins with a `:', -traditional versions of make do not allow the `:' character to -form a valid target name. \fBdmake\fP allows `:' to be present in -target/prerequisite names as long as the entire target/prerequisite name is -quoted. For example: -.sp -\ta:fred : test -.sp -would be parsed as TARGET = a, PREREQUISITES={fred, :, test}, which -is not what was intended. To fix this you must write: -.sp -\t"a:fred" : test -.sp -Which will be parsed as expected. Quoted target and prerequisite -specifications may also contain white space thereby allowing the use of -complex function macro expressions.. -See the EXAMPLES section for how to apply \fB"\fP quoting -to a list of targets. -.SH ATTRIBUTES -.B dmake -defines several target attributes. Attributes may be -assigned to a single target, a group of targets, or to all targets in the -makefile. Attributes are used to modify -\fBdmake\fP actions during target update. -The recognized attributes are: -.sp -.IP \fB.EPILOG\fP 1.2i -Insert shell epilog code when executing a group recipe associated with -any target having this attribute set. -.IP \fB.ERRREMOVE\fP 1.2i -Always remove any target having this attribute if an error is encountered -while making them. Setting this attribute overrides the .PRECIOUS attribute. -.IP \fB.EXECUTE\fP 1.2i -If the \-n flag was given then execute the recipe associated with any -target having this attribute set. -.IP \fB.FIRST\fP 1.2i -Used in conjunction with .INCLUDE. Terminates the inclusion with the first -successfully included prerequisite. -.IP \fB.GROUP\fP 1.2i -Force execution of a target's recipe as a group recipe. -.IP \fB.IGNORE\fP 1.2i -Ignore an error when trying to make any target with this attribute set. -.IP \fB.IGNOREGROUP\fP 1.2i -Disable the special meaning of '[' to initiate a group recipe. -.IP \fB.LIBRARY\fP 1.2i -Target is a library. -.IP \fB.MKSARGS\fP 1.2i -If running in an MSDOS environment then use MKS extended argument passing -conventions to pass arguments to commands. Non-MSDOS -environments ignore this attribute. -.IP \fB.NOINFER\fP 1.2i -Any target with this attribute set will not be subjected -to transitive closure if it is inferred as a prerequisite -of a target whose recipe and prerequisites are being inferred. -(i.e. the inference algorithm will not use any prerequisite with this attribute -set, as a target) -If specified as '.NOINFER:' (ie. with no prerequisites or targets) then the -effect is equivalent to specifying \fB\-T\fP on the command line. -.IP \fB.NOSTATE\fP 1.2i -Any target with this attribute set will not have command line flag -information stored in the state file if .KEEP_STATE has been enabled. -.IP \fB.PHONY\fP 1.2i -Any target with this attribute set will have its recipe executed -each time the target is made even if a file matching the target name can -be located. Any targets that have a .PHONY attributed target as a -prerequisite will be made each time the .PHONY attributed prerequisite is -made. -.IP \fB.PRECIOUS\fP 1.2i -Do not remove associated target under any circumstances. -Set by default for any targets whose corresponding files exist in the file -system prior to the execution of \fBdmake\fP. -.IP \fB.PROLOG\fP 1.2i -Insert shell prolog code when executing a group recipe associated with -any target having this attribute set. -.IP \fB.SEQUENTIAL\fP 1.2i -Force a sequential make of the associated target's prerequisites. If set -as a global attribute this implies setting MAXPROCESS=1. -.IP \fB.SETDIR\fP 1.2i -Change current working directory to specified directory when making the -associated target. You must -specify the directory at the time the attribute is specified. To do this -simply give \fI.SETDIR=path\fP as the attribute. \fIpath\fP is expanded and -the result is used as the value of the directory to change to. -If \fIpath\fP contains \fB$$@\fP then the name of the target to be built is -used in computing the path to change directory to. -If path is surrounded by single quotes then path is not expanded, and is used -literally as the directory name. -If the \fIpath\fP contains any `:' characters then the entire attribute string -must be quoted using ". -If a target having this attribute set also has the .IGNORE -attribute set then if the change to the specified directory fails it will be -ignored, and no error message will be issued. -.IP \fB.SILENT\fP 1.2i -Do not echo the recipe lines when making any target with this attribute set, -and do not issue any warnings. -.IP \fB.SWAP\fP 1.2i -Under MSDOS -when making a target with this attribute set swap the \fBdmake\fP executable -to disk prior to executing the recipe line. Also see the '%' recipe line -flag defined in the RECIPES section. -.IP \fB.SYMBOL\fP 1.2i -Target is a library member and is an entry point into a module in the -library. This attribute is used only when searching a library for a target. -Targets of the form lib((entry)) have this attribute set automatically. -.IP \fB.USESHELL\fP 1.2i -Force each recipe line of a target to be executed using a shell. -Specifying this attribute is equivalent to specifying the '+' character at the -start of each line of a non-group recipe. -.IP \fB.UPDATEALL\fP 1.2i -Indicates that all the targets listed in this rule are updated by the -execution of the accompanying recipe. -A common example is the production of the -.I y.tab.c -and -.I y.tab.h -files by -.B yacc -when it is run on a grammar. Specifying .UPDATEALL in such a rule -prevents the running of yacc twice, once for the y.tab.c file and once -for the y.tab.h file. .UPDATEALL targets that are specified in a single rule -are treated as a single target and all timestamps are updated whenever any -target in the set is made. As a side-effect, \fBdmake\fP internally sorts -such targets in ascending alphabetical order and the value of $@ is always -the first target in the sorted set. -.IP \fB.WINPATH\fP 1.2i -Switch between default (POSIX) and Windows style path representation. -(This attribute is specific for cygwin dmake executables and non-cygwin -environments ignore this attribute.) -.sp -Under Cygwin it can be useful to generate Windows style paths (with -regular slashes) instead of the default cygwin style (POSIX) paths -for dmake's dynamic macros. -The affected macros are $@, $*, $>, $?, $<, $&, $^ and $(MAKEDIR), $(PWD), -$(TMD), $(TMPFILE) and the $(mktmp ...) function macro. -This feature can be used to create DOS style path parameters -for native W32 programs from dynamic macros. -.sp -\fBNote\fP that the Windows style paths use regular slashes ('/') instead -of the usual Windows backslash ('\\') as directory separator to avoid quoting -problems (after all it is still a cygwin \fBdmake\fP!) and cygwin, as well -as native Windows, programs should have no problems using this (c:/foo/bar) -path representation. -.sp -Example: Assuming the current target to be /tmp/mytarget the $@ macro -without .WINPATH active expands to: -.RS -.sp -.RS -/tmp/mytarget -.sp -.RE -With .WINPATH set it expands to: -.sp -.RS -C:/cygwin/tmp/mytarget -.RE -.RE -.LP -All attributes are user setable and except for .UPDATEALL and .MKSARGS -may be used in one of two forms. -The .MKSARGS attribute is restricted to use as a global attribute, and -the use of the .UPDATEALL attribute is restricted to rules -of the second form only. -.sp -\tATTRIBUTE_LIST : \fItargets\fP -.sp -assigns the attributes specified by ATTRIBUTE_LIST to each target in -.I targets -or -.sp -\t\fItargets\fP ATTRIBUTE_LIST : ... -.sp -assigns the attributes specified by ATTRIBUTE_LIST to each target in -.I targets. -In the first form if -.I targets -is empty (ie. a NULL list), then the -list of attributes will apply to all targets in the makefile -(this is equivalent to the common Make construct of \fI".IGNORE :"\fP -but has been modified to the notion of an attribute instead of -a special target). -Not all of the attributes have global meaning. -In particular, .LIBRARY, .NOSTATE, .PHONY, .SETDIR, .SYMBOL and .UPDATEALL -have no assigned global meaning. -.PP -Any attribute may be used with any target, even with the special targets. -Some combinations are useless (e.g. .INCLUDE .PRECIOUS: ... ), -while others are useful (e.g. .INCLUDE .IGNORE : "file.mk" will not complain -if file.mk cannot be found using the include file search rules, -see the section on SPECIAL TARGETS for a description of .INCLUDE). -If a specified attribute will not be used with the special target a warning -is issued and the attribute is ignored. -.SH MACROS -.B dmake -supports six forms of macro assignment. -.sp -.IP "\fBMACRO = LINE\fP" 1.55i -This is the most common and familiar form of macro assignment. It assigns -LINE literally as the value of MACRO. -Future expansions of MACRO recursively expand its value. -.IP "\fBMACRO *= LINE\fP" 1.55i -This form behaves exactly as the simple '=' form with the exception that if -MACRO already has a value then the assignment is not performed. -.IP "\fBMACRO := LINE\fP" 1.55i -This form differs from the simple '=' form in that it expands LINE -prior to assigning it as the value of MACRO. -Future expansions of MACRO do not recursively expand its value. -.IP "\fBMACRO *:= LINE\fP" 1.55i -This form behaves exactly as the ':=' form with the exception that if -MACRO already has a value then the assignment and expansion are not performed. -.IP "\fBMACRO += LINE\fP" 1.55i -This form of macro assignment allows macro values to grow. It takes the -literal value of LINE and appends it to the previous value of MACRO separating -the two by a single space. -Future expansions of MACRO recursively expand its value. -.IP "\fBMACRO +:= LINE\fP" 1.55i -This form is similar to the '+=' form except that the value of LINE is expanded -prior to being added to the value of MACRO. -.PP -Macro expressions specified on the command line allow the macro value -to be redefined within the makefile only if the macro is defined using -the '+=' and '+:=' operators. Other operators will define a macro that cannot -be further modified. -.PP -Each of the preceeding macro assignment operators may be prefixed by \fB!\fP -to indicate that the assignment should be forced and that no warnings should -be issued. Thus, specifying \fB!\fP has the effect of silently forcing the -specified macro assignment. -.PP -When \fBdmake\fP defines a non-environment macro it strips leading and -trailing white space from the macro value. -Macros imported from the environment via either the .IMPORT special -target (see the SPECIAL TARGETS section), or the \fB\-e\fP, or \fB\-E\fP flags -are an exception to this rule. Their values are -always taken literally and white space is never stripped. -In addition, named macros defined using the .IMPORT special target do -not have their values expanded when they are used within a makefile. -In contrast, environment macros that are imported -due to the specification of the \fB\-e\fP or \fB\-E\fP flags -are subject to expansion when used. -.PP -To specify a macro expansion -enclose the name in () or {} and precede it with a dollar sign $. -Thus $(TEST) represents an expansion of the macro variable named TEST. -If TEST is -defined then $(TEST) is replaced by its expanded value. If TEST is not -defined then $(TEST) expands to the NULL string (this is equivalent to -defining a macro as 'TEST=' ). A short form may be used for single character -named macros. In this case the parentheses are optional, and $(I) is -equivalent to $I. -Macro expansion is recursive, hence, if the value string contains an expression -representing a macro expansion, the expansion is performed. Circular macro -expansions are detected and cause an error to be issued. -.PP -When defining a macro the given macro name is first expanded before being used -to define the macro. Thus it is possible to define macros whose names -depend on values of other macros. For example, suppose CWD is defined as -.sp -\tCWD = $(PWD:b) -.sp -then the value of $(CWD) is the name of the current directory. -This can be used to define macros specific to this directory, for -example: -.sp -\t_$(CWD).prt = list of files to print... -.sp -The actual name of the defined macro is a function of the current directory. -A construct such as this is useful when processing a hierarchy of directories -using .SETDIR attributed targets and a collection of small distributed -makefile stubs. -.PP -Macro variables may be defined within the makefile, on the command -line, or imported from the environment. -.PP -.B \fBdmake\fR -supports several non-standard macro expansions: -The first is of the form: -.RS -.IP \fI$(macro_name:modifier_list:modifier_list:...)\fR -.RE -.LP -where -.I modifier_list -may be a combination of: -.RS -.sp -.Is "b or B " -.Ii "b or B" -\- file (not including suffix) portion of path names -.Ii "d or D" -\- directory portion of all path names -.Ii "e or E" -\- suffix portion of path names -.Ii "f or F" -\- file (including suffix) portion of path names -.Ii "i or I" -\- inferred names of targets -.Ii "n or N" -\- normalized path names -.Ii "l or L" -\- macro value in lower case -.Ii "u or U" -\- macro value in upper case -.Ii "1" -\- return the first white space separated token from value -.RE -.sp -or a single one of: -.RS -.sp -.Ii "m or M" -\- map escape codes found in macro to their ASCII value -.Ii "s or S" -\- simple pattern substitution -.Ii "t or T" -\- tokenization. -.Ii "^" -\- prepend a prefix to each token -.Ii "+" -\- append a suffix to each token -.sp -.RE -.fi -Thus if we have the example: -.RS -test = d1/d2/d3/a.out f.out d1/k.out -.RE -The following macro expansions produce the values on the right of '\(->' after -expansion. -.RS -.sp -.Is "$(test:s/out/in/:f) " -.Ii "$(test:d)" -\(-> d1/d2/d3/ d1/ -.Ii "$(test:b)" -\(-> a f k -.Ii "$(test:f)" -\(-> a.out f.out k.out -.Ii "${test:db}" -\(-> d1/d2/d3/a f d1/k -.Ii "${test:s/out/in/:f}" -\(-> a.in f.in k.in -.Ii $(test:f:t"+") -\(-> a.out+f.out+k.out -.Ii $(test:e) -\(-> .out .out .out -.Ii $(test:u) -\(-> D1/D2/D3/A.OUT F.OUT D1/K.OUT -.Ii $(test:1) -\(-> d1/d2/d3/a.out -.RE -.fi -.PP -For this macro -.RS -test = d1/d2/../a.out "d1/file name.ext" -.RE -the following results are returned: -.RS -.sp -.Is "$(test:s/out/in/:f) " -.Ii "$(test:n)" -\(-> d1/a.out "d1/file name.ext" -.RE -.fi -.PP -If a token ends in a string composed from the value of the macro DIRBRKSTR -(ie. ends in a directory separator string, e.g. '/' in UNIX) and you use the -\fB:d\fP modifier then the expansion returns the directory name less the -final directory separator string. Thus successive pairs of :d modifiers -each remove a level of directory in the token string. -.PP -The infered names of targets \fB:i\fP modifier returnes the actual filename -associated to the target, see BINDING TARGETS. If the value is not a target or -prerequisite the value is returned unchanged. For the following example: -.RS -test = aprog bprog -.RE -If aprog and bprog are targets or prerequisits and they are bound -to /tmp/aprog and bprog (see .SOURCE special target) the macro expansion -has the following effect: -.RS -.sp -.Is "$(test:s/out/in/:f) " -.Ii "$(test:i)" -\(-> /tmp/aprog bprog -.RE -.fi -.PP -The normalized path names \fB:n\fP modifier honors the setting of .WINPATH to -determine the output format of the result. -.PP -The map escape codes modifier changes the following escape codes \ea => <bel>, -\&\eb => <backspace>, \ef => <formfeed>, \en => <nl>, \er => <cr>, -\&\et => <tab>, \ev => <vertical tab>, \e" => ", and \exxx => <xxx> where -xxx is the octal representation of a character into the corresponding ASCII -value. -.PP -The tokenization, prepend and append modifier may use the same escape codes -that are supported by the map escape codes modifier in the string that is -inserted, prepended or added by the respective macro modifier. -These modifiers may quote this string to include otherwise problematic -characters. E.g. spaces, colons and parentheses. -.PP -The tokenization modifier takes all white space separated tokens from the -macro value and separates them by the separator string. Thus the -expansion: -.LP -.RS -.nf -$(test:f:t"+\en") -.RE -produces: -.RS -a.out+ -f.out+ -k.out -.fi -.RE -.PP -The prefix operator \fB^\fP takes all white space separated tokens from the -macro value and prepends \fIstring\fP to each. -.LP -.RS -.nf -$(test:f:^mydir/) -.RE -produces: -.RS -mydir/a.out mydir/f.out mydir/k.out -.fi -.RE -.PP -The suffix operator \fB+\fP takes all white space separated tokens from the -macro value and appends \fIstring\fP to each. -.LP -.RS -.nf -$(test:b:+.c) -.RE -produces: -.RS -a.c f.c k.c -.fi -.RE -.PP -The next non-standard form of macro expansion allows for recursive macros. -It is possible to specify a $(\fImacro_name\fR) or ${\fImacro_name\fR} expansion -where \fImacro_name\fR contains more $( ... ) or ${ ... } macro expansions -itself. -.PP -For example $(CC$(_HOST)$(_COMPILER)) will first expand CC$(_HOST)$(_COMPILER) -to get a result and use that result as the name of the macro to expand. -This is useful for writing a makefile for more than one target -environment. As an example consider the following hypothetical case. -Suppose that _HOST and _COMPILER are imported from the environment -and are set to represent the host machine type and the host compiler -respectively. -.RS -.sp -.nf -CFLAGS_VAX_CC = \-c \-O # _HOST == "_VAX", _COMPILER == "_CC" -CFLAGS_PC_MSC = \-c \-ML # _HOST == "_PC", _COMPILER == "_MSC" -.sp -# redefine CFLAGS macro as: -.sp -CFLAGS := $(CFLAGS$(_HOST)$(_COMPILER)) -.fi -.sp -.RE -This causes CFLAGS to take on a value that corresponds to the -environment in which the make is being invoked. -.PP -The final non-standard macro expansion is of the form: -.RS -.sp -string1{token_list}string2 -.RE -.LP -where string1, string2 and token_list are expanded. After expansion, -string1 is prepended to each token found in token_list and -string2 is appended to each resulting token from the previous prepend. -string1 and string2 are not delimited by white space -whereas the tokens in token_list are. -A null token in the token list -is specified using "". -Thus using another example we have: -.RS -.sp -.Is "test/{f1 f2}.o " -.Ii "test/{f1 f2}.o" ---> test/f1.o test/f2.o -.Ii "test/ {f1 f2}.o" ---> test/ f1.o f2.o -.Ii "test/{f1 f2} .o" ---> test/f1 test/f2 .o -.Ii "test/{""f1"" """"}.o" ---> test/f1.o test/.o -.sp -.Ii and -.sp -.Is "test/{d1 d2}/{f1 f2}.o --> " -.Ii "test/{d1 d2}/{f1 f2}.o --> " -test/d1/f1.o test/d1/f2.o -test/d2/f1.o test/d2/f2.o -.sp -.RE -.fi -This last expansion is activated only when the first characters of -\fItoken_list\fP -appear immediately after the opening '{' with no intervening white space. -The reason for this restriction is the following incompatibility with -Bourne Shell recipes. The line -.RS -.sp -{ echo hello;} -.sp -.RE -is valid /bin/sh syntax; while -.RS -.sp -{echo hello;} -.sp -.RE -.fi -is not. Hence the latter triggers the enhanced macro expansion while the former -causes it to be suppressed. -See the SPECIAL MACROS section for a description of the special macros that -\fBdmake\fP defines and understands. -.SH "RULES AND TARGETS" -A makefile contains a series of entries that specify dependencies. -Such entries are called \fItarget/prerequisite\fP or \fIrule\fP definitions. -Each rule definition -is optionally followed by a set of lines that provide a recipe for updating -any targets defined by the rule. -Whenever -.B dmake -attempts to bring a target up to date and an explicit recipe is provided with -a rule defining the target, that recipe is used to update the -target. A rule definition begins with a line having the following syntax: -.sp -.RS -.nf -\fI<targets>\fP [\fI<attributes>\fP] \fI<ruleop>\fP [\fI<prerequisites>\fP] [;\fI<recipe>\fP] -.fi -.RE -.sp -.I targets -is a non-empty list of targets. If the target is a -special target (see SPECIAL TARGETS section below) then it must appear alone -on the rule line. For example: -.sp -.RS -\&.IMPORT .ERROR : ... -.RE -.sp -is not allowed since both .IMPORT and .ERROR are special targets. -Special targets are not used in the construction of the dependency graph and -will not be made. -.PP -.I attributes -is a possibly empty list of attributes. Any attribute defined in the -ATTRIBUTES section above may be specified. All attributes will be applied to -the list of named targets in the rule definition. No other targets will -be affected. -.sp -.IP NOTE: 0.75i -As stated earlier, -if both the target list and prerequisite list are empty but the attributes -list is not, then the specified attributes affect all targets in the makefile. -.sp -.PP -.I ruleop -is a separator which is used to identify the targets from the prerequisites. -Optionally it also provides a facility for modifying the way in which -.B dmake -handles the making of the associated targets. -In its simplest form the operator is a single ':', and need not be separated -by white space from its neighboring tokens. It may additionally be followed -by any of the modifiers { !, ^, \-, :, | }, where: -.sp -.IP \fB!\fP -says execute the recipe for the associated targets once for each out of date -prerequisite. (The meaning of the runtime macro \fB$?\fP is changed, see -below in the -.B "RUNTIME MACROS" -section.) Ordinarily the recipe is executed -once for all out of date prerequisites at the same time. -.IP \fB^\fP -says to insert the specified prerequisites, if any, before any -other prerequisites already associated with the specified targets. -In general, it is not useful to specify ^ with an empty -list of prerequisites. -.IP \fB\-\fP -says to clear the previous list of prerequisites before adding -the new prerequisites. Thus, -.sp -\tfoo : -.br -\tfoo : bar baz -.sp -can be replaced by -.sp -\tfoo :\- bar baz -.sp -however the old form still works as expected. -.IP \fB:\fP -When the rule operator is not modified by a second ':' -only one set of rules may be specified for making a target. -Multiple definitions may be used to add to the -list of prerequisites that a target depends on. -However, if a target is multiply defined -only one definition may specify a recipe -for making the target. -.sp -When a target's rule operator is modified by a second ':' -(:: for example) then this definition may not be the only -definition with a recipe for the target. There may be other :: target -definition lines that specify a different set of prerequisites with a -different recipe for updating the target. -Any such target is made if any of the definitions -find it to be out of date -with respect to the related prerequisites -and the corresponding recipe is used to update the -target. By definition all '::' recipes that are found to be out of date for -are executed. -.sp -In the following simple example, each rule has a `::' \fIruleop\fP. In such an -operator we call the first `:' the operator, and the second `:' the modifier. -.sp -.nf -a.o :: a.c b.h - first recipe for making a.o - -a.o :: a.y b.h - second recipe for making a.o -.fi -.sp -If a.o is found to be out of date with respect to a.c then the first recipe -is used to make a.o. If it is found out of date with respect to a.y then -the second recipe is used. If a.o is out of date with respect to -b.h then both recipes are invoked to make a.o. -In the last case the order of invocation corresponds to the order in which the -rule definitions appear in the makefile. -.IP \fB|\fP -Is defined only for PERCENT rule target definitions. When specified it -indicates that the following construct should be parsed using the old -semantinc meaning: -.sp -.nf -%.o :| %.c %.r %.f ; some rule -.sp -is equivalent to: -.sp -%.o : %.c ; some rule -%.o : %.r ; some rule -%.o : %.f ; some rule -.fi -.PP -Targets defined using a single `:' operator -with a recipe may be redefined again with a new recipe by using a -`:' operator with a `:' modifier. -This is equivalent to a target having been -initially defined with a rule using a `:' modifier. -Once a target is defined using a `:' -modifier it may not be defined again with a recipe using only the `:' operator -with no `:' modifier. In both cases the use of a `:' modifier creates a new -list of prerequisites and makes it the current prerequisite list for the target. -The `:' operator with no recipe always modifies the current list -of prerequisites. -Thus assuming each of the following definitions has a recipe attached, then: -.RS -.sp -.nf -joe : fred ... (1) -joe :: more ... (2) -.sp -and -.sp -joe :: fred ... (3) -joe :: more ... (4) -.sp -.fi -.RE -are legal and mean: add the recipe associated with (2), or (4) to the set -of recipes for joe, placing them after existing recipes for -making joe. -The constructs: -.RS -.sp -.nf -joe :: fred ... (5) -joe : more ... (6) -.sp -and -.sp -joe : fred ... (7) -joe : more ... (8) -.sp -.fi -.RE -are errors since we have two sets of perfectly good recipes for -making the target. -.PP -.I prerequisites -is a possibly empty list of targets that must be brought up to date before -making the current target. -.PP -.I recipe -is a short form and allows the user to specify short rule definitions -on a single line. -It is taken to be the first recipe line in a larger recipe -if additional lines follow the rule definition. -If the semi-colon is present but the recipe line is empty (ie. null string) -then it is taken -to be an empty rule. Any target so defined causes target to be treated -as a virtual target, see VIRTUAL TARGETS below. -.SH "RECIPES" -The traditional format used by most versions of Make defines the recipe -lines as arbitrary strings that may contain macro expansions. They -follow a rule definition line and may be spaced -apart by comment or blank lines. -The list of recipe lines defining the recipe is terminated by a new target -definition, a macro definition, or end-of-file. -Each recipe line -.B MUST -begin with a \fB<TAB>\fP character (or \fBspaces\fP, see \fB.NOTABS\fP) -which may optionally be followed with one or all the following -.I recipe property -characters -.IR "'@%+\-'" -which affect the recipe execution: -.IP "'\-'" -indicates that non-zero exit values (ie. errors) -are to be ignored when this recipe line is executed. -.IP "'\+'" -indicates that the current recipe line is to be executed using the shell. Group recipes implicitely ignore this property. -.IP "'%'" -indicates that -.B dmake -should swap itself out to secondary storage (MSDOS only) before running the -recipe. -.IP "'@'" -indicates that the recipe line should NOT be echoed to the terminal prior to -being executed. -.IP "'@@'" -is a stronger version of the previous property. The recipe line and the -output (stdout and stderr) of the executed recipe are NOT shown on the -terminal. -.LP -Each property is off by default -(ie. by default, errors are significant, commands are echoed, no swapping is -done and a shell is -used only if the recipe line contains a character found in the value of the -SHELLMETAS macro). -Global settings activated via command line options or special attribute or -target names may also affect these settings. -An example recipe: -.sp -.RS -.nf -target : -.RS -first recipe line -second recipe line, executed independent of first. -@a recipe line that is not echoed --and one that has errors ignored -%and one that causes dmake to swap out -+and one that is executed using a shell. -.RE -.fi -.RE -.PP -The second and new format of the recipe block begins the block with the -character '[' (the open group character) in the last non-white space -position of a line, and terminates the -block with the character ']' (the close group character) -in the first non-white space position of a line. -In this form each recipe line need not have a leading TAB. This is -called a recipe group. Groups so defined are fed intact as a single -unit to a shell for execution whenever the corresponding target needs to -be updated. If the open group character '[' is preceded -by one or all of the -.I recipe properties -(\-, %, @ and @@) -then they apply to the entire group in the same way that they -apply to single recipe lines. You may also specify '+' but it is -redundant as a shell is already being used to run the recipe. -See the MAKING TARGETS section for a description of how -.B dmake -invokes recipes. -Here is an example of a group recipe: -.sp -.RS -.nf -target : -[ - first recipe line - second recipe line - tall of these recipe lines are fed to a - single copy of a shell for execution. -] -.fi -.RE -.sp -.SH "BUILTIN COMMANDS" -.B dmake -supports some builtin commands. An optional leading '+' describes that -the builtin can be used also when being executed in a shell otherwise it -is only implemented when used directly. Remember that if a character of the -recipe is found in the SHELLMETAS macro the execution of the recipe in a -shell is forced. -.IP "[\fB+\fP]\fBnoop\fP [\fBsomething\fP]" -The \fBnoop\fP internal command always returns success if used but it is -not executed even though the rest of the commandline is evaluated. -This command can be used to evaluate macro expansions at the runtime of the -recipe without starting a real commmand. -.IP "[\fB+\fP]<empty recipe> -If an empty recipe line is encountered it is not executed. This sounds -more trivial than it really is because the recipe could consist of -macros that evaluated to empty or whitespace only strings. -.IP "\fBecho\fP [\fB-n\fP] \fBdata\fP" -This internal command prints data (with all leading whitespace removed, but -otherwise literally) to stdout. If the '-n' switch is given no trailing -newline is printed. Note that no quoting is removed nor that escape sequences -are handled. -.PP -No special treatment of buildin commands for group recipes is implemented -even though the <empty recipe> will most propably also not be evaluated by -most shells that can be used to handle the recipe groups. -.SH "TEXT DIVERSIONS" -.B dmake -supports the notion of text diversions. -If a recipe line contains the macro expression -.RS -.sp -$(mktmp[,[\fIfile\fP][,\fItext\fP]] \fIdata\fP) -.sp -.RE -then all text contained in the \fIdata\fP expression is expanded and -is written to a temporary file. The \fIdata\fP in the file will always -be terminated from a new line character. The \fIfile\fP parameter can -be used to override the name of the temporary file. If its expanded value -is not empty it will be used instead of the unique and thread safe file -name that otherwise would be generated internally. The return -value of the macro is the name of the temporary file unless the \fItext\fP -parameter is defined. In this case the return value is the expanded value -of \fItext\fP. -.PP -.I data -can be any text and must be separated from the 'mktmp' portion of the -macro name by white-space. The only restriction on the data text is that -it must contain a balanced number of parentheses of the same kind as are -used to initiate the $(mktmp ...) expression. For example: -.RS -.sp -$(mktmp $(XXX)) -.sp -.RE -is legal and works as expected, but: -.RS -.sp -$(mktmp text (to dump to file) -.sp -.RE -is not legal. You can achieve what you wish by either defining a macro that -expands to '(' or by using {} in the macro expression; like this: -.RS -.sp -${mktmp text (to dump to file} -.sp -.RE -Since the temporary file is opened when the -macro containing the text diversion expression is expanded, diversions may -be nested and any diversions that are created as part of ':=' macro -expansions persist for the duration of the -.B dmake -run. -If the \fIdata\fP text is to contain new lines the map escape codes macro -expasion can be used. For example the expression: -.RS -.sp -.nf -mytext:=this is a\entest of the text diversion -all: - cat $(mktmp $(mytext:m)) -.fi -.sp -.RE -is replaced by: -.RS -.sp -cat /tmp/mk12294AA -.sp -.RE -where the temporary file contains two lines both of which are terminated -by a new-line. -A second more illustrative example generates a response file to an MSDOS -link command: -.RS -.sp -.nf -OBJ = fred.obj mary.obj joe.obj -all : $(OBJ) - link @$(mktmp $(^:t"+\en")) -.fi -.sp -.RE -The result of making `all' in the second example is the command: -.RS -.sp -link @/tmp/mk02394AA -.sp -.RE -where the temporary file contains: -.RS -.sp -.nf -fred.obj+ -mary.obj+ -joe.obj -.fi -.sp -.RE -The last line of the file is terminated by a new-line which is always -inserted at the end of the \fIdata\fP string. -.PP -If the optional \fIfile\fP specifier is present it can be used to specify -the name of the temporary file to create. An example that would be useful -for MSDOS users with a Turbo-C compiler -.RS -.sp -$(mktmp,turboc.cfg $(CFLAGS)) -.sp -.RE -will place the contents of CFLAGS into a local \fIturboc.cfg\fP file. -The second optional argument, \fItext\fP, if present alters the name -of the value returned by the $(mktmp ...) macro. -.PP -Under MS-DOS text diversions may be a problem. Many DOS tools require -that path names which contain directories use the \e character to delimit -the directories. Some users however wish to use the '/' to delimit pathnames -and use environments that allow them to do so. -The macro USESHELL is set to "yes" if the -current recipe is forced to use a shell via the .USESHELL or '+' directives, -otherwise its value is "no". -The -.B dmake -startup files define the macro DIVFILE whose value is either the -value of TMPFILE or the value of TMPFILE edited to replace any '/' characters -to the appropriate value based on the current shell and whether it will be -used to execute the recipe. -.PP -Previous versions of -.B dmake -defined text diversions using <+, +> strings, -where <+ started a text diversion and +> terminated one. -.B dmake -is backward compatible with this construct only -if the <+ and +> appear literally -on the same recipe line or in the same macro value string. In such instances -the expression: -.sp -\t<+data+> -.sp -is mapped to: -.sp -\t$(mktmp data) -.sp -which is fully output compatible with the earlier construct. <+, +> -constructs whose text spans multiple lines must be converted by hand to use -$(mktmp ...). -.PP -If the environment variable TMPDIR is defined then the -temporary file is placed into the directory specified by that variable. -A makefile can modify the location of temporary files by -defining a macro named TMPDIR and exporting it using the .EXPORT special -target. -.SH "VIRTUAL TARGETS" -.B Dmake -allows to define targets with the sole purpose to enforce a dependency -chain that are unable to create the target, hence virtual targets. -When \fBdmake\fP tries to make a target, but only finds a target definition -without recipe lines, it would normally issues -a \fB"Don't know how to make ..."\fP error message, but if a target rule is -terminated by a semicolon and has no following recipe lines, -or if it has no recipe lines, but defines prerequisites, -or if the AUGMAKE mode is enabled (see the COMPATIBILITY section for details), -the target is treated as a virtual target and the error is suppressed. In -addition to this, if the default target does not have recipe lines it is also -treated as a virtual target. -.PP -Virtual targets should not have a corresponding file therefore -they inherit the time of their newest prerequisite if they have prerequisites, -otherwise they get the current time assigned when being made. -If the virtual target has a corresponding file a warning is issued, but the -time stamp of that file is taken into account. The virtual target uses the -time stamp of the corresponding file if it is newer than the one determined -by the previous rule. -.SH "SPECIAL TARGETS" -This section describes the special targets that are recognized by \fBdmake\fP. -Some are affected by attributes and others are not. -.IP \fB.ERROR\fP 1.4i -If defined then the recipe associated with this target is executed -whenever an error condition is detected by \fBdmake\fP. All attributes that -can be used with any other target may be used with this target. Any -prerequisites of this target will be brought up to date during its processing. -NOTE: errors will be ignored while making this target, in extreme cases this -may cause some problems. -.IP \fB.EXIT\fP 1.4i -If this target is encountered while parsing a makefile then the parsing of the -makefile is immediately terminated at that point. -.IP \fB.EXPORT\fP 1.4i -All prerequisites associated with this target are assumed to -correspond to macro names and they and their values -are exported to the environment as environment strings at the point in -the makefile at which this target appears. -Any attributes specified with this target are ignored. -Only macros which have been assigned a value in the makefile prior to the -export directive are exported, macros as yet undefined -or macros whose value contains any of the characters "+=:*" -are not exported. -.sp -Note that macros that are not expanded during the macro assignment and contain -other macros will be written into the environment containing these other -macros in the form of $(macroname). -.IP \fB.IMPORT\fP 1.4i -Prerequisite names specified for this target are searched for in the -environment and defined as macros with their value taken from the environment. -If the special name \fB.EVERYTHING\fP is used as a prerequisite name then -all environment variables defined in the environment are imported. -The functionality of the \fB\-E\fP flag can be forced by placing the construct -\&\fI.IMPORT : .EVERYTHING\fP at the start of a makefile. Similarly, by -placing the construct at the end, one can emulate the effect of the \fB\-e\fP -command line flag. -If a prerequisite name cannot be found in the environment -an error message is issued. -\&.IMPORT accepts the .IGNORE attribute. When given, it causes \fBdmake\fP -to ignore the above error. -See the MACROS section for a description of the processing of imported macro -values. -.IP \fB.INCLUDE\fP 1.4i -Parse another makefile just as if it had been located at the point of the -\&.INCLUDE in the current makefile. -The list of prerequisites gives the list of -makefiles to try to read. If the list contains multiple makefiles then they -are read in order from left to right. The following search rules are used -when trying to locate the file. If the filename is surrounded by " or just -by itself then it is searched for in the current directory. If it is not -found it is then searched for in each of the directories specified -as prerequisites of the \&.INCLUDEDIRS special target. -If the file name is surrounded by < and >, (ie. -<my_spiffy_new_makefile>) then it is searched for only in the directories -given by the .INCLUDEDIRS special target. In both cases if the file name is a -fully qualified name starting at the root of the file system then it is only -searched for once, and the .INCLUDEDIRS list is ignored. -If .INCLUDE fails to find the file it invokes the inference engine to -try to infer and hence make the file to be included. In this way the -file can be checked out of an RCS repository for example. -\&.INCLUDE accepts -the .IGNORE, .SETDIR, and .NOINFER attributes. -If the .IGNORE attribute is given and the file -cannot be found then \fBdmake\fP continues processing, -otherwise an error message is generated. -If the .NOINFER attribute is given and the file -cannot be found then \fBdmake\fP will not attempt to -\fIinfer and make\fP the file. -The .SETDIR attribute causes -.B dmake -to change directories to the specified directory prior to attempting the -include operation. If all fails \fBdmake\fP attempts to \fImake\fP the file -to be included. If making the file fails then \fBdmake\fP terminates unless -the .INCLUDE directive also specified the .IGNORE attribute. -If .FIRST is specified along with .INCLUDE then \fBdmake\fP attempts to -include each named prerequisite and will terminate the inclusion with the -first prerequisite that results in a successful inclusion. -.IP \fB.INCLUDEDIRS\fP 1.4i -The list of prerequisites specified for this target defines the set of -directories to search when trying to include a makefile. -.IP \fB.KEEP_STATE\fP 1.4i -This special target is a synonym for the macro definition -.sp -\&\t.KEEP_STATE := _state.mk -.sp -It's effect is to turn on STATE keeping and to define \fI_state.mk\fP -as the state file. -.IP \fB.MAKEFILES\fP 1.4i -The list of prerequisites is the set of files to try to read as the default -makefile. By default this target is defined as: -.sp -\t\&.MAKEFILES : makefile.mk Makefile makefile -.sp -.IP \fB.REMOVE\fP 1.4i -The recipe of this target is used whenever \fBdmake\fP needs to remove -intermediate targets that were made but do not need to be kept around. -Such targets result from the application of transitive closure on the -dependency graph. -.IP \fB.ROOT\fP 1.4i -The internal root of the dependency graph, see section STARTUP for details. -.IP \fB.SOURCE\fP 1.4i -The prerequisite list of this target defines a set of directories to check -when trying to locate a target file name. See the section on BINDING of -targets for more information. -.IP \fB.SOURCE.suff\fP 1.4i -The same as .SOURCE, except that the .SOURCE.suff list is searched first when -trying to locate a file matching the a target whose name ends in the suffix -\&.suff. -.IP \fB.SUFFIXES\fP 1.4i -This deprecated special target has no special meaning. Avoid its use. -.IP \fB.TARGETS\fP 1.4i -The internal targets that all user defined targets are prerequisites of, -see section STARTUP for details. -.PP -There are a few targets that are "slightly" special: -.RS -.nf - -\&\fB.INIT\fP -\&\fB.DONE\fP - -.fi -.RE -These targets exist because of historical reasons, see the usage of .INIT -and .DONE in section "STARTUP", they can be used and defined as ordinary -targets but are special in the sense that even though they start with a `.' -they are not treated as a .<suffix> meta target (See the AUGMAKE META RULES -section for details). -.PP -.B Please note -that self defined targets shouldn't use the prefix `.' as they would be -handled as .<suffix> meta targets and dmake most propably would complain -about this. -.PP -In addition to the special targets above, -several other forms of targets are recognized and are considered special, -their exact form and use is defined in the sections that follow. -.SH "SPECIAL MACROS" -.B dmake -defines a number of special macros. They are divided into three classes: -control macros, run-time macros, and function macros. -The control macros are used by -.B dmake -to configure its actions, and are the preferred method of doing so. -In the case when a control macro has the same function as a special -target or attribute they share the same name as the special target or -attribute. -The run-time macros are defined when -.B dmake -makes targets and may be used by the user inside recipes. -The function macros provide higher level functions dealing with macro -expansion and diversion file processing. -.SH "CONTROL MACROS" -To use the control macros simply assign them a value just like any other -macro. The control macros are divided into three groups: -string valued macros, character valued macros, and boolean valued macros. -.PP -The following are all of the string valued macros. -This list is divided into two groups. The first group gives the string -valued macros that are defined internally and cannot be directly set by the -user. -.IP \fBABSMAKECMD\fP 1.6i -\fBWarning!\fP This macro's value is differently defined for a native Windows -dmake executable (compiled with MS Visual C++ or MinGW) and dmake for other -operating systems or build with other compilers. -.sp -In the first case its value is the absolute filename of the executable of -the current dmake process, otherwise it is defined as the NULL string. -.IP \fBINCDEPTH\fP 1.6i -This macro's value is a string of digits representing -the current depth of makefile inclusion. -In the first makefile level this value is zero. -.IP \fBMFLAGS\fP 1.6i -Is the list of flags -that were given on the command line including a leading switch character. -The \-f flag is not included in this list. -.IP \fBMAKECMD\fP 1.6i -Is the name with which \fBdmake\fP was invoked. -.IP \fBMAKEDIR\fP 1.6i -Is the full path to the initial directory in which -.B dmake -was invoked. -.IP \fBMAKEFILE\fP 1.6i -Contains the string "\-f \fImakefile\fP" where, \fImakefile\fP is the name -of initial user makefile that was first read. -.IP \fBMAKEFLAGS\fP 1.6i -Is the same as $(MFLAGS) but has no leading switch -character. (ie. MFLAGS = \-$(MAKEFLAGS)) -.IP \fBMAKEMACROS\fP 1.6i -Contains the complete list of macro expressions that were specified on the -command line. -.IP \fBMAKETARGETS\fP 1.6i -Contains the name(s) of the target(s), if any, that were -specified on the command line. -.IP \fBMAKEVERSION\fP 1.6i -Contains a string indicating the current \fBdmake\fP version number. -.IP \fBMAXPROCESSLIMIT\fP 1.6i -Is a numeric string representing the maximum number of processes that -\fBdmake\fP can use when making targets using parallel mode. -.IP \fBNULL\fP 1.6i -Is permanently defined to be the NULL string. -This is useful when comparing a conditional expression to an NULL value. -.IP \fBPWD\fP 1.6i -Is the full path to the -current directory in which make is executing. -.IP \fBSPACECHAR\fP 1.6i -Is permanently defined to contain one space character. This is useful -when using space characters in function macros, e.g. subst, that -otherwise would get deleted (leading/trailing spaces) or for using -spaces in function macro parameters. -.IP \fBTMPFILE\fP 1.6i -Is set to the name of the most recent temporary file opened by \fBdmake\fP. -Temporary files are used for text diversions and for group recipe processing. -.IP \fBTMD\fP 1.6i -Stands for "To Make Dir", and -is the path from the present directory (value of $(PWD)) to the directory -that \fBdmake\fP was started up in (value of $(MAKEDIR)). If the present -directory is the directory that \fBdmake\fP was started up in TMD will be -set to the relative path ".". This allows to create valid paths by prepending -$(TMD)$(DIRSEPSTR) to a relative path. -This macro is modified when .SETDIR attributes are processed. -TMD will usually be a relative path with the following two exceptions. If the -relative path would go up until the root directory or if different drive -letters (DOS file system) make a relative path impossible the absolute path -from MAKEDIR is used. -.IP \fBUSESHELL\fP 1.6i -The value of this macro is set to "yes" if the current recipe is forced to -use a shell for its execution via the .USESHELL or '+' directives, its value -is "no" otherwise. -.sp -.PP -The second group of string valued macros control -.B dmake -behavior and may be set by the user. -.IP \fB.DIRCACHE\fP 1.6i -If set to "yes" enables the directory cache (this is the default). If set to -"no" disables the directory cache (equivalent to -d command-line flag). -.IP \fB.DIRCACHERESPCASE\fP 1.6i -If set to "yes" causes the directory cache, if enabled, to respect -file case, if set to "no" files are cached case insensitive. -By default it is set to "no" on Windows as the filesystems on -this operating system are case insensitive and set to "yes" for all -other operating systems. The default can be overriden, if desired. -.sp -\fBNote:\fP Using case insensitive directory caching on case sensitive -file systems is a \fBBAD\fP idea. If in doubt use case sensitive -directory caching even on case insensitive file systems as the -worst case in this scenario is that /foo/bar/ and /foo/BAR/ are -cached separately (with the same content) even though they are -the same directory. This would only happen if different targets -use different upper/lower case spellings for the same directory -and that is \fBnever\fP a good idea. -.IP \fBNAMEMAX\fP 1.6i -Defines the maximum length of a filename component. The value of the variable -is initialized at startup to the value of the compiled macro NAME_MAX. On -some systems the value of NAME_MAX is too short by default. Setting a new -value for NAMEMAX will override the compiled value. -.IP \fB.NOTABS\fP 1.6i -When set to "yes" enables the use of spaces as well as <tabs> to begin -recipe lines. -By default a non\-group recipe is terminated by a line without any leading -white\-space or by a line not beggining with a <tab> character. -Enabling this mode modifies the first condition of -the above termination rule to terminate a -non\-group recipe with a line that contains only white\-space. -This mode does not effect the parsing of group recipes bracketed by []. -.IP \fBAUGMAKE\fP 1.6i -If set to "yes" value will enable the transformation of special -meta targets to support special AUGMAKE inferences (See the "AUGMAKE -META RULES" and "COMPATIBILITY" sections). -.IP \fBDIRBRKSTR\fP 1.6i -Contains the string of chars used to terminate -the name of a directory in a pathname. -Under UNIX its value is "/", under MSDOS its value is "/\e:". -.IP \fBDIRSEPSTR\fP 1.6i -Contains the string that is used to separate directory components when -path names are constructed. It is defined with a default value at startup. -.IP \fBDIVFILE\fP 1.6i -Is defined in the startup file and gives the name that should be returned for -the diversion file name when used in -$(mktmp ...) expansions, see the TEXT DIVERSION section for details. -.IP \fB.KEEP_STATE\fP 1.6i -Assigning this macro a value tells -.B dmake -the name of the state file to use and turns on the keeping of state -information for any targets that are brought up to date by the make. -.IP \fBGROUPFLAGS\fP 1.6i -This macro gives the set of flags to pass to the shell when -invoking it to execute a group recipe. The value of the macro is the -list of flags with a leading switch indicator. (ie. `\-' under UNIX) -.IP \fBGROUPSHELL\fP 1.6i -This macro defines the full -path to the executable image to be used as the shell when -processing group recipes. This macro must be defined if group recipes are -used. It is assigned a default value in the startup makefile. Under UNIX -this value is /bin/sh. -.IP \fBGROUPSUFFIX\fP 1.6i -If defined, this macro gives the string to use as a suffix -when creating group recipe files to be handed to the command interpreter. -For example, if it is defined as .sh, then all -temporary files created by \fBdmake\fP will end in the suffix .sh. -Under MSDOS if you are using command.com as your GROUPSHELL, then this suffix -must be set to .bat in order for group recipes to function correctly. -The setting of GROUPSUFFIX and GROUPSHELL is done automatically for -command.com in the startup.mk files. -.IP \fBMAKE\fP 1.6i -Is defined in the startup file by default. -Initially this macro is defined to have the value "$(MAKECMD) $(MFLAGS)". -The string $(MAKE) is recognized when using the \-n switch. -.IP \fBMAKESTARTUP\fP 1.6i -This macro defines the full path to the initial startup -makefile. Use the \fB\-V\fP command line option to discover its initial -value. -.IP \fBMAXLINELENGTH\fP 1.6i -This macro defines the maximum size of a single line of -makefile input text. The size is specified as a number, the default value -is defined internally and is shown via the \fB\-V\fP option. -A buffer of this size plus 2 is allocated for reading makefile text. The -buffer is freed before any targets are made, thereby allowing files containing -long input lines to be processed without consuming memory during the actual -make. -This macro can only be used to extend the line length beyond it's default -minimum value. -.IP \fBMAXPROCESS\fP 1.6i -Specify the maximum number of child processes to use when making targets. -The default value of this macro is "1" and its value cannot exceed the value -of the macro MAXPROCESSLIMIT. Setting the value of MAXPROCESS on the command -line or in the makefile is equivalent to supplying a corresponding value to -the -P flag on the command line. If the global .SEQUENTIAL attribute is set -(or the -S command line switch is used) the value of MAXPROCESS is fixed -to "1" and cannot be changed. -.IP \fBOOODMAKEMODE\fP 1.6i -This macro enables a special compatibility mode needed by the OpenOffice.org -build system. If set, the switch disables the removal of leading './' path -elements during target filename normalization (See BINDING TARGETS). If './' -appear in the pathname, but not at the beginning of it, they are still -removed by the normalization. Please note that targets that are given on the -command line are going to be registered as default targets \fBafter\fP the -startup file is read. -.IP \fBPREP\fP 1.6i -This macro defines the number of iterations to be expanded -automatically when processing % rule definitions of the form: -.sp -% : %.suff -.sp -See the sections on PERCENT(%) RULES for details on how PREP is used. -.IP \fBSHELL\fP 1.6i -This macro defines the full path to the executable -image to be used as the shell when -processing single line recipes. This macro must be defined if recipes -requiring the shell for execution are to be used. -It is assigned a default value in the startup makefile. -Under UNIX this value is /bin/sh. -.IP \fBSHELLCMDQUOTE\fP 1.6i -This macro can be used to add additional characters before and after the -command string that is passed to the shell defined by the SHELL macro. -If needed, like for \fIcmd.exe\fP and \fIcommand.com\fP, it is assigned -a value in the startup file. -.IP \fBSHELLFLAGS\fP 1.6i -This macro gives the set of flags to pass to the shell when -invoking it to execute a single line recipe. The value of the macro is the -list of flags with a leading switch indicator. (ie. `\-' under UNIX) -.IP \fBSHELLMETAS\fP 1.6i -Each time -.B dmake -executes a single recipe line (not a group recipe) the line is -searched for any occurrence of a character defined in the value of SHELLMETAS. -If such a character is found the recipe line is defined to require a shell -to ensure its correct execution. In such instances -a shell is used to invoke the recipe line. -If no match is found the recipe line is executed without the use of a shell. -.sp -.PP -There is only one character valued macro defined by \fBdmake\fP: -\fBSWITCHAR\fP contains the switch character used -to introduce options on command lines. For UNIX its value is `\-', and for -MSDOS its value may be `/' or `\-'. -The macro is internally defined and is not user setable. -The MSDOS version of \fBdmake\fP attempts to first extract SWITCHAR from an -environment variable of the same name. If that fails it then attempts to -use the undocumented getswitchar system call, and returns the result of -that. Under MSDOS version 4.0 you must set the value of the environment -macro SWITCHAR to '/' to obtain predictable behavior. -.PP -All boolean macros currently understood by -.B dmake -correspond directly to the previously defined attributes. -These macros provide -a second way to apply global attributes, and represent the -preferred method of doing so. They are used by assigning them a -value. If the value is not a NULL string then the boolean condition -is set to on. -If the value is a NULL string then the condition is set to off. -There are five conditions defined and they correspond directly to the -attributes of the same name. Their meanings are defined in the ATTRIBUTES -section above. -The macros are: -\&\fB.EPILOG\fP, -\&\fB.IGNORE\fP, -\&\fB.MKSARGS\fP, -\&\fB.NOINFER\fP, -\&\fB.PRECIOUS\fP, -\&\fB.PROLOG\fP, -\&\fB.SEQUENTIAL\fP, -\&\fB.SILENT\fP, -\&\fB.SWAP\fP, and -\&\fB.USESHELL\fP. -Assigning any of these a non NULL value will globally set -the corresponding attribute to on. -.SH "RUNTIME MACROS" -These macros are defined -when \fBdmake\fP is making targets, and may take on different values for each -target. \fB$@\fP is defined to be the full target name, \fB$?\fP is the -list of all out of date prerequisites, except for the \fB!\fP ruleop, in -which case it is set to the current build -prerequisite instead. \fB$&\fP is the list of all -prerequisites, \fB$>\fP is the name of the library if the current target is a -library member, and -\fB$<\fP is the list of prerequisites specified in the current rule. -If the current target had a recipe inferred then \fB$<\fP is the name of the -inferred prerequisite even if the target had a list of prerequisites supplied -using an explicit rule that did not provide a recipe. In such situations -\fB$&\fP gives the full list of prerequisites. -.PP -\fB$*\fP is defined as -\fB$(@:db)\fP when making targets with explicit recipes and is defined as the -value of % when making targets whose recipe is the result of an inference. -In the first case \fB$*\fP is the target name with no suffix, -and in the second case, is the value of the matched % pattern from -the associated %-rule. -\fB$^\fP expands to the set of out of date prerequisites taken from the -current value of \fB$<\fP. -In addition to these, -\fB$$\fP expands to $, \fB{{\fP expands to {, \fB}}\fP expands to }, and the -strings \fB<+\fP and \fB+>\fP are recognized -as respectively starting and terminating a text diversion when they appear -literally together in the same input line. -.PP -The difference between $? and $^ can best be illustrated by an example, -consider: -.RS -.sp -.nf -fred.out : joe amy hello -\trules for making fred - -fred.out : my.c your.h his.h her.h # more prerequisites -.fi -.sp -.RE -Assume joe, amy, and my.c are newer then fred.out. When -.B dmake -executes the recipe for making fred.out the values of the following macros -will be: -.RS -.sp -.nf -.Is "$@ " -.Ii "$@" ---> fred.out -.Ii "$*" ---> fred -.Ii "$?" ---> joe amy my.c # note output of $? vs $^ -.Ii "$^" ---> joe amy -.Ii "$<" ---> joe amy hello -.Ii "$&" ---> joe amy hello my.c your.h his.h her.h -.fi -.sp -.RE -.SH "FUNCTION MACROS" -.B dmake -supports a full set of functional macros. One of these, the $(mktmp ...) -macro, is discussed in detail in the TEXT DIVERSION section and is not -covered here. -The names of function macros must appear literally after the opening $( -or ${. They are \fBnot\fP recognized if they are the result of a recursive -expansion. -.PP -Note that some of these macros take comma separated parameters -but that these parameters must not contain literal whitespaces. Whitespaces -in macros used in these parameters are allowed. -.RS -.sp -.IP "$(\fBand\fP \fBmacroterm ...\fP)" -expands each \fBmacroterm\fP in turn until there are no more or one of -them returns an empty string. If all expand to non-empty strings the -macro returs the string "t" otherwise it returns an empty string. -.sp -.IP "$(\fBassign\fP \fBexpression\fP)" -Causes \fIexpression\fP to be parsed as a macro assignment expression and results -in the specified assignment being made. An error is issued if the assignment -is not syntatically correct. \fIexpression\fP may contain white space. This is -in effect a dynamic macro assignment facility and may appear anywhere any -other macro may appear. The result of the expanding a dynamic macro -assignment expression is the name of the macro that was assigned and $(NULL) -if the \fIexpression\fP is not a valid macro assignment expression. -Some examples are: -.RS -.sp -.nf -$(assign foo := fred) -$(assign $(ind_macro_name) +:= $(morejunk)) -.fi -.RE -.IP "$(\fBecho\fP \fBlist\fP)" -Echo's the value of \fIlist\fP. \fIlist\fP is not expanded. -.IP "$(\fBeq\fP,\fItext_a\fP,\fItext_b\fP \fBtrue\fP \fBfalse\fP)" -expands -.I text_a -and -.I text_b -and compares their results. If equal it returns the result of the expansion -of the -.B true -term, otherwise it returns the expansion of the -.B false -term. -.IP "$(\fB!eq\fP,\fItext_a\fP,\fItext_b\fP \fBtrue\fP \fBfalse\fP)" -Behaves identically to the previous macro except that the -.B true -string is chosen if the expansions of the two strings are not equal -.IP "$(\fBforeach\fP,\fIvar\fP,\fIlist\fP \fBdata\fP)" -Implements iterative macro expansion over \fIdata\fP using \fBvar\fP as the -iterator taking on values from \fIlist\fP. \fIvar\fP and \fIlist\fP are -expanded and the result is the concatenation of expanding \fIdata\fP with -\fIvar\fP being set to each whitespace separated token from \fIlist\fP. -For example: -.RS -.RS -.sp -.nf -list = a b c -all :; echo [$(foreach,i,$(list) [$i])] -.fi -.sp -.RE -will output -.RS -.sp -.nf -[[a] [b] [c]] -.fi -.sp -.RE -The iterator variable is defined as a local variable to this foreach -instance. The following expression illustrates this: -.RS -.sp -.nf -$(foreach,i,$(foreach,i,$(sort c a b) root/$i) [$i/f.h]) -.fi -.sp -.RE -when evaluated the result is: -.RS -.sp -.nf -[root/a/f.h] [root/b/f.h] [root/c/f.h] -.fi -.sp -.RE -The specification of list must be a valid macro expression, such as: -.RS -.sp -.nf -$($(assign list=a b c)) -$(sort d a b c) -$(echo a b c) -.fi -.sp -.RE -and cannot just be the list itself. That is, the following foreach -expression: -.RS -.sp -.nf -$(foreach,i,a b c [$i]) -.fi -.sp -.RE -yields: -.RS -.sp -.nf -"b c [a]" -.fi -.sp -.RE -when evaluated. -.RE -.IP "$(\fBnil\fP \fBexpression\fP)" -Always returns the value of $(NULL) regardless of what \fIexpression\fP is. -This function macro can be used to discard results of expanding -macro expressions. -.IP "$(\fBnormpath\fP \fBlist\fP)" -Will return the normalized path names of all white-space separated tokens -in \fBlist\fP. Quotes can be used to normalize path names that contain -white-space characters. On cygwin the result honors the setting of .WINPATH -to determine the output format of the returned path names. -.IP "$(\fBnormpath,para\fP \fBlist\fP)" -Same as above except that the expanded value of \fBpara\fP is used to -override the .WINPATH setting. -.IP "$(\fBnot\fP \fBmacroterm\fP)" -expands \fBmacroterm\fP and returs the string "t" if the result of the -expansion is the empty string; otherwise, it returns the empty string. -.IP "$(\fBnull\fP,\fItext\fP \fBtrue\fP \fBfalse\fP)" -expands the value of -.I text. -If it is NULL then the macro returns the value of the expansion of \fBtrue\fP -and the expansion of \fBfalse\fP otherwise. The terms \fBtrue\fP, and -\fBfalse\fP must be strings containing no white\-space. -.IP "$(\fB!null\fP,\fItext\fP \fBtrue\fP \fBfalse\fP)" -Behaves identically to the previous macro except that the -.B true -string is chosen if the expansion of -.I text -is not NULL. -.IP "$(\fBor\fP \fBmacroterm ...\fP)" -expands each \fBmacroterm\fP in turn and returs the empty string if -each term expands to the empty string; otherwise, it returs the string -"t". -.IP "$(\fBshell\fP \fBcommand\fP)" -is a shell escape macro. It runs \fIcommand\fP as if it were part of a -recipe and returns, separated by a single space, all the non-white -space terms written to stdout by the command. -For example: -.RS -.RS -.sp -$(shell ls *.c) -.sp -.RE -will return \fI"a.c b.c c.c d.c"\fP if the files exist in the current -directory. The recipe modification flags \fB[+@%\-]\fP are honored if they -appear as the first characters in the command. For example: -.RS -.sp -$(shell +ls *.c) -.sp -.RE -will run the command using the current shell. -.LP -\fBNote\fP that if the macro is part of a recipe it will be evaluated after -all previous recipe lines have been executed. For obvious reasons it will be -evaluated before the current recipe line or group recipe is executed. -.RE -.IP "$(\fBshell,expand\fP \fBcommand\fP)" -Is an extension to the \fB$(shell command)\fP function macro that expands the -result of running \fBcommand\fP. -.IP "$(\fBsort\fP \fBlist\fP)" -Will take all white\-space separated tokens in \fIlist\fP and will -return their sorted equivalent list. -.IP "$(\fBstrip\fP \fBdata\fP)" -Will replace all strings of white\-space in data by a single space. -.IP "$(\fBsubst\fP,\fIpat\fP,\fIreplacement\fP \fBdata\fP)" -Will search for \fIpat\fP in -.B data -and will replace any occurrence of -.I pat -with the -.I replacement -string. The expansion -.RS -.sp -$(subst,.o,.c $(OBJECTS)) -.sp -.RE -is equivalent to: -.RS -.sp -$(OBJECTS:s/.o/.c/) -.sp -.RE -.IP "$(\fBuniq\fP \fBlist\fP)" -Will take all white\-space separated tokens in \fIlist\fP and will -return their sorted equivalent list containing no duplicates. -.sp -.RE -For historic reasons \fBdmake\fP treats the following case slightly special: -.RS -.sp -$(\fBname\fP \fBsomething\fP) -.sp -.RE -If it encounters a macro with a whitespace after \fBname\fP and \fBname\fP -is not literally one of the above mentioned function macro identifiers then -\fBdmake\fP will return the recursively expanded value of \fB$(name)\fP. -The remaining \fBsomething\fP part will be expanded but the result will be -discarded. The use of this special feature is deprecated and should not be -used. -.sp -.SH "CONDITIONAL MACROS" -.B dmake -supports conditional macros. These allow the definition of target specific -macro values. You can now say the following: -.RS -.sp -\fBtarget\fP ?= \fIMacroName MacroOp Value\fP -.sp -.RE -This creates a definition for \fIMacroName\fP whose value is \fIValue\fP -only when \fBtarget\fP is being made. You may use a conditional macro -assignment anywhere that a regular macro assignment may appear, including -as the value of a $(assign ...) macro. -.LP -The new definition is associated with the most recent cell definition -for \fBtarget\fP. If no prior definition exists then one is created. The -implications of this are immediately evident in the following example: -.sp -.RS -.nf -foo := hello -.sp -all : cond;@echo "all done, foo=[$(foo)] bar=[$(bar)]" -.sp -cond ?= bar := global decl -.sp -cond .SETDIR=unix::;@echo $(foo) $(bar) -cond ?= foo := hi -.sp -cond .SETDIR=msdos::;@echo $(foo) $(bar) - cond ?= foo := hihi -.fi -.RE -.sp -The first conditional assignment creates a binding for 'bar' that is -activated when 'cond' is made. The bindings following the :: definitions are -activated when their respective recipe rules are used. Thus the -first binding serves to provide a global value for 'bar' while any of the -cond :: rules are processed, and the local bindings for 'foo' come into -effect when their associated :: rule is processed. -.LP -Conditionals for targets of .UPDATEALL are all activated before the -target group is made. Assignments are processed in order. Note that -the value of a conditional macro assignment is NOT AVAILABLE until the -associated target is made, thus the construct -.sp -.RS -.nf -mytarget ?= bar := hello -mytarget ?= foo := $(bar) -.fi -.RE -.sp -results in $(foo) expanding to "", if you want the result to be "hello" -you must use: -.sp -.RS -.nf -mytarget ?= bar := hello -mytarget ?= foo = $(bar) -.fi -.RE -.sp -Once a target is made any associated conditional macros are deactivated -and their values are no longer available. Activation occurrs after all -inference, and .SETDIR directives have been processed and after $@ is -assigned, but before prerequisites are processed; thereby making the values of -conditional macro definitions available during construction of prerequisites. -.LP -If a %-meta rule target has associated conditional macro assignments, -and the rule is chosen by the inference algorithm then the conditional -macro assignments are inferred together with the associated recipe. -.SH "DYNAMIC PREREQUISITES" -.B dmake -looks for prerequisites whose names contain macro expansions during target -processing. Any such prerequisites are expanded and the result of the -expansion is used as the prerequisite name. As an example the line: -.sp -\tfred : $$@.c -.sp -causes the $$@ to be expanded when \fBdmake\fP is making fred, and it resolves -to the target \fIfred\fP. -This enables dynamic prerequisites to be generated. The value -of @ may be modified by any of the valid macro modifiers. So you can say for -example: -.sp -\tfred.out : $$(@:b).c -.sp -where the $$(@:b) expands to \fIfred\fP. -Note the use of $$ instead of $ to indicate the dynamic expansion, this -is due to the fact that the rule line is expanded when it is initially parsed, -and $$ then returns $ which later triggers the dynamic prerequisite expansion. -Dynamic macro expansion is performed in all user defined rules, and the special -targets .SOURCE*, and .INCLUDEDIRS. -.PP -\fBNOTE:\fP The use of a \fB$\fP as part of a prerequisite or target name is -\fBstrongly discouraged\fP as the runtime macros (like $@) are expanded when -used in a recipe line so that the $ is interpreted as a macro identifier and -not as a character of the filename leading to invalid runtime macros. -In addition to this no filename normalization is done for prerequisites and -targets that contain $ characters. -Nevertheless it is possible to use $ in prerequisites by using $$$$ but this -is \fBnot recommended\fP and can lead to surprising results. -.PP -If dynamic macro expansion results in multiple white space separated tokens -then these are inserted into the prerequisite list inplace of the dynamic -prerequisite. Due to the recursive nature of macro expansion the prerequisite -list is fully expanded even if the dynamic prerequisite contained other -runtime macros. -.SH "BINDING TARGETS" -This operation takes a target name and binds it to an existing file, if -possible. -.B dmake -makes a distinction between the internal target name of a target and its -associated external file name. -Thus it is possible for a target's internal name and its external -file name to differ. -To perform the binding, the following set of rules is used. -Assume that we are -trying to bind a target whose name is of the form \fIX.suff\fP, -where \fI.suff\fP is the suffix and \fIX\fP is the stem portion -(ie. that part which contains the directory and the basename). -.B dmake -takes this target name and performs a series of search operations that try to -find a suitably named file in the external file system. -The search operation is user controlled -via the settings of the various .SOURCE targets. -.RS -.IP 1. -If target has the .SYMBOL attribute set then look for it in the library. -If found, replace the target name with the library member name and continue -with step 2. If the name is not found then return. -.IP 2. -Extract the suffix portion (that following the `.') of the target name. -If the suffix is not null, look up the special target .SOURCE.<suff> -(<suff> is the suffix). -If the special target exists then search each directory given in -the .SOURCE.<suff> prerequisite list for the target. -If the target's suffix was null (ie. \fI.suff\fP was empty) then -perform the above search but use the special target .SOURCE.NULL instead. -If at any point a match is found then terminate the search. -If a directory in the prerequisite list is the special name `.NULL ' perform -a search for the full target name without prepending any directory portion -(ie. prepend the NULL directory). -.IP 3. -The search in step 2. failed. Repeat the same search but this time -use the special target .SOURCE. -(a default target of '.SOURCE : .NULL' is defined by \fBdmake\fP at startup, -and is user redefinable) -.IP 4. -The search in step 3. failed. -If the target has the library member attribute (.LIBMEMBER) -set then try to find the target in the library which was passed along -with the .LIBMEMBER attribute (see the MAKING LIBRARIES section). -The bound file name assigned to a target which is successfully -located in a library is the same name that would be assigned had the search -failed (see 5.). -.IP 5. -The search failed. Either the target was not found in any of the search -directories or no applicable .SOURCE special targets exist. -If applicable .SOURCE special targets exist, but the target was not found, -then \fBdmake\fP assigns the first name searched as the bound file name. -If no applicable .SOURCE special targets exist, -then the full original target name becomes the bound file name. -.RE -.PP -There is potential here for a lot of search operations. The trick is to -define .SOURCE.x special targets with short search lists and leave .SOURCE -as short as possible. -The search algorithm has the following useful side effect. -When a target having the .LIBMEMBER (library member) attribute is searched for, -it is first searched for as an ordinary file. -When a number of library members require updating it is desirable to compile -all of them first and to update the library at the end in a single operation. -If one of the members does not compile and \fBdmake\fP stops, then -the user may fix the error and make again. \fBdmake\fP will not remake any -of the targets whose object files have already been generated as long as -none of their prerequisite files have been modified as a result of the fix. -.PP -When \fBdmake\fP constructs target (and prerequisite) pathnames they are -normalized to the shortest (or most natural, see below for the cygwin case) -representation. Substrings like './' or of the form 'baz/..' are removed -and multiple slashes are collapsed to one unless they are at the beginning -of the pathname. Leading slashes are normalized according to POSIX rules, -i.e. more than two leading slashes are reduced to one slash and a -leading '//' is kept as it might have a special meaning. -For example "./foo", "bar/../foo" and foo are recognized as the same file. -This may result in somewhat unexpected values of the macro expansion -of runtime macros like \fB$@\fP, but is infact the corect result. -.PP -\fBNOTE:\fP A cygwin \fBdmake\fP executable will accept DOS like pathnames -with drive letters and cygwin POSIX pathnames and normalize them into its -natural POSIX representation. This might result in even more surprising -values of runtime macros. -.PP -When defining .SOURCE and .SOURCE.x targets the construct -.RS -.sp -\&.SOURCE : -.br -\&.SOURCE : fred gery -.sp -.RE -is equivalent to -.RS -.sp -\&.SOURCE :\- fred gery -.RE -.PP -\fBdmake\fP correctly handles the UNIX Make variable VPATH. By definition VPATH -contains a list of ':' separated directories to search when looking for a -target. \fBdmake\fP maps VPATH to the following special rule: -.RS -.sp -\&.SOURCE :^ $(VPATH:s/:/ /) -.sp -.RE -Which takes the value of VPATH and sets .SOURCE to the same set of directories -as specified in VPATH. -.SH "PERCENT(%) RULES AND MAKING INFERENCES" -When \fBdmake\fP makes a target, the target's set of prerequisites (if any) -must exist and the target must have a recipe which \fBdmake\fP -can use to make it. -If the makefile does not specify an explicit recipe for the target then -.B dmake -uses special rules to try to infer a recipe which it can use -to make the target. Previous versions of Make perform this task by using -rules that are defined by targets of the form .<suffix>.<suffix> (this is still -supported, see "AUGMAKE META RULES") or by using the \fBnot supported\fP by -dmake .SUFFIXES list of suffixes (see "SPECIAL TARGETS" for more details -about .SUFFIXES). The exact workings of this mechanism -were sometimes difficult to understand and often limiting in their usefulness. -Instead, \fBdmake\fP supports the concept of \fI%-meta\fP rules. -The syntax and semantics of these rules differ from standard rule lines as -follows: -.sp -.nf -.RS -\fI<%-targets>\fP [\fI<attributes>\fP] \fI<ruleop>\fP [\fI<%-prereqs>\fP] [;\fI<recipe>\fP] -.RE -.fi -.sp -where \fI%-targets\fP are one or more targets containing exactly a single `%' -sign, -.I attributes -is a list (possibly empty) of attributes, -.I ruleop -is the standard set of rule operators, -.I "%-prereqs" -\&, if present, is a list of prerequisites containing zero or more `%' signs, -and -.I recipe, -if present, is the first line of the recipe. -.PP -If more than one %-target is present this line is equivalent to a repetition -of the whole [<attributes>] <ruleop> [<%-prereqs>] [;<recipe>] sequence -for each %-target, i.e. it is possible to specify the same rule for multiple -%-targets. Because of this following only speaks about \fI<%-target>\fP as -\fI%-targets\fP are divided into multiple definitions with a single %-target. -.PP -\fBNOTE:\fP As multiple %-targets didn't work reliably with dmake versions prior -to 4.5 unless the rule operator `|:' was used we currently issue a warning -stating that it \fBnow\fP works. -.PP -The -.I %-target -defines a pattern against which a target whose recipe is -being inferred gets matched. The pattern match goes as follows: all chars are -matched exactly from left to right up to but not including the % sign in the -pattern, % then matches the longest string from the actual target name -not ending in -the suffix given after the % sign in the pattern. -Consider the following examples: -.RS -.sp -.nf -.Is "dir/%.c " -.Ii "%.c" -matches fred.c but not joe.c.Z -.Ii "dir/%.c" -matches dir/fred.c but not dd/fred.c -.Ii "fred/%" -matches fred/joe.c but not f/joe.c -.Ii "%" -matches anything -.fi -.sp -.RE -In each case the part of the target name that matched the % sign is retained -and is substituted for any % signs in the prerequisite list of the %-meta rule -when the rule is selected during inference and -.B dmake -constructs the new dependency. -.PP -.B Please note, -that only the first, non-indirect, prerequisite of the list is used for the -inference mechanism. If more than one non-indirect prerequisite is given -a warning is issued and all but the first non-indirect prerequisites are -ignored. See below for a description of indirect prerequisites. -.PP -As an example the following %-meta rules describe the following: -.RS -.sp -%.c : %.y ; recipe... -.sp -.RE -describes how to make any file ending in .c if a corresponding file ending -in .y can be found. -.RS -.sp -foo%.o : fee%.k ; recipe... -.sp -.RE -is used to describe how to make fooxxxx.o from feexxxx.k. -.RS -.sp -%.a :; recipe... -.sp -.RE -describes how to make a file whose suffix is .a without inferring any -prerequisites. -.RS -.sp -%.c : %.y 'yaccsrc/%.y' ; recipe... -.sp -.RE -matches the corresponding .y file as prerequisite and additionally another .y -file in the yaccsrc subdirectory as indirect prerequisite. -Another interesting example is: -.RS -.sp -% : RCS/%,v ; co $< -.sp -.RE -which describes how to take any target and check it out of -the RCS directory if the corresponding file exists in the RCS directory. -The equivalent SCCS rule would be: -.RS -.sp -% : s.% ; get $< -.sp -.RE -.PP -The previous RCS example defines an infinite rule, because it says how to make -.I anything -from RCS/%,v, and -.I anything -also includes RCS/fred.c,v. -To limit the size of the graph that results from such rules -.B dmake -uses the macro variable PREP (stands for % repetition). By default the value -of this variable is 0, which says that no repetitions of a %-rule are to be -generated. If it is set to something greater than 0, then that many -repetitions of any infinite %-rule are allowed. If in the above -example PREP was set to 1, then \fBdmake\fP would generate the dependency -graph: -.RS -.sp -% --> RCS/%,v --> RCS/RCS/%,v,v -.sp -.RE -Where each link is assigned the same recipe as the first link. -PREP should be used only in special cases, since it may result in -a large increase in the number of possible prerequisites tested. -.B dmake -further assumes that any target that has no suffix can be made from -a prerequisite that has at least one suffix. -.PP -.B dmake -supports dynamic prerequisite generation for prerequisites of %-meta rules. -This is best illustrated by an example. The RCS rule shown above can infer -how to check out a file from a corresponding RCS file only if the target -is a simple file name with no directory information. That is, the above rule -can infer how to find \fIRCS/fred.c,v\fP from the target \fIfred.c\fP, -but cannot infer how to find \fIsrcdir/RCS/fred.c,v\fP from \fIsrcdir/fred.c\fP -because the above rule will cause \fBdmake\fP to look for RCS/srcdir/fred.c,v; -which does not exist (assume that srcdir has its own RCS directory as is the -common case). -.PP -A more versatile formulation of the above RCS check out rule is the following: -.RS -.sp -% : $$(@:d)RCS/$$(@:f),v : co $@ -.sp -.RE -This rule uses the dynamic macro $@ to specify the prerequisite to try to -infer. During inference of this rule the macro $@ is set to the value of -the target of the %-meta rule and the appropriate prerequisite is generated by -extracting the directory portion of the target name (if any), appending the -string \fIRCS/\fP to it, and appending the target file name with a trailing -\fI,v\fP attached to the previous result. -.PP -.B dmake -can also infer indirect prerequisites. -An inferred target can have a list of prerequisites added that will not -show up in the value of $< but will show up in the value of $? and $&. -Indirect prerequisites are specified in an inference rule by quoting the -prerequisite with single quotes. For example, if you had the explicit -dependency: -.RS -.sp -.nf -fred.o : fred.c ; rule to make fred.o -fred.o : local.h -.fi -.sp -.RE -then this can be inferred for fred.o from the following inference rule: -.RS -.sp -%.o : %.c 'local.h' ; makes a .o from a .c -.sp -.RE -You may infer indirect prerequisites that are a function of the value of '%' -in the current rule. The meta-rule: -.RS -.sp -%.o : %.c '$(INC)/%.h' ; rule to make a .o from a .c -.sp -.RE -infers an indirect prerequisite found in the INC directory whose name is the -same as the expansion of $(INC), and the prerequisite name depends on the -base name of the current target. -The set of indirect prerequisites is attached to the meta rule in which they -are specified and are inferred only if the rule is used to infer a recipe -for a target. They do not play an active role in driving the inference -algorithm. -The construct: -.RS -.sp -%.o :| %.c %.f 'local.h'; recipe -.sp -.RE -is equivalent to: -.RS -.sp -.nf -%.o : %.c 'local.h' ; recipe -%.o : %.f 'local.h' ; recipe -.fi -.sp -.RE -.PP -If any of the attributes .EPILOG, .IGNORE, .LIBRARY, .NOSTATE, .PHONY, .PRECIOUS, -\&.PROLOG, .SETDIR, .SILENT, .SWAP, .USESHELL and .WINPATH -are given for a %-rule then when that rule is bound to a target -as the result of an inference, the target's set of attributes is augmented by -the attributes from the above set that are specified in the bound %-rule. -Other attributes specified for %-meta rules are not inherited by the target. -The .SETDIR attribute is treated in a special way. -If the target already had a .SETDIR attribute set then -.B dmake -changes to that directory prior to performing the inference. -During inference any .SETDIR attributes for the inferred prerequisite -are honored. -The directories must exist for a %-meta rule to be selected as a possible -inference path. If the directories do not exist no error message is issued, -instead the corresponding path in the inference graph is rejected. -.PP -.B dmake -bases all of its inferences on the inference graph constructed from the -%-rules defined in the makefile. -It knows exactly which targets can be made from which prerequisites by -making queries on the inference graph. -.PP -For a %-meta rule to be inferred as the -rule whose recipe will be used to make a target, the target's name must match -the %-target pattern, and any inferred %-prerequisite must already exist or -have an explicit recipe so that the prerequisite can be made. -Without \fItransitive closure\fP on the inference graph the above rule -describes precisely when an inference match terminates the search. -If transitive closure is enabled (the usual case), and a prerequisite does -not exist or cannot be made, then -.B dmake -invokes the inference algorithm recursively on the prerequisite to see if -there is some way the prerequisite can be manufactured. For, if the -prerequisite can be made then the current target can also be made using the -current %-meta rule. -This means that there is no longer a need to give a rule -for making a .o from a .y if you have already given a rule for making a .o -from a .c and a .c from a .y. In such cases -.B dmake -can infer how to make the -\&.o from the .y via the intermediary .c and will remove the .c when the .o is -made. Transitive closure can be disabled by giving the \-T switch on the -command line. -.PP -A word of caution. -.B dmake -bases its transitive closure on the %-meta rule targets. -When it performs transitive closure it infers how to make a target from a -prerequisite by performing a pattern match as if the potential prerequisite -were a new target. -The set of rules: -.RS -.nf -.sp -%.o : %.c ; rule for making .o from .c -%.c : %.y ; rule for making .c from .y -% : RCS/%,v ; check out of RCS file -.fi -.sp -.RE -will, by performing transitive closure, allow \fBdmake\fP to infer how to make -a .o from a .y using a .c as an intermediate temporary file. Additionally -it will be able to infer how to make a .y from an RCS file, as long as that -RCS file is in the RCS directory and has a name which ends in .y,v. -The transitivity computation is performed dynamically for each target that -does not have a recipe. This has potential to be costly if the %-meta -rules are not carefully specified. The .NOINFER attribute is used to mark -a %-meta node as being a final target during inference. Any node with this -attribute set will not be used for subsequent inferences. As an example -the node RCS/%,v is marked as a final node since we know that if the RCS file -does not exist there likely is no other way to make it. Thus the standard -startup makefile contains an entry similar to: -.RS -.nf -\&.NOINFER : RCS/%,v -.fi -.RE -Thereby indicating that the RCS file is the end of the inference chain. -Whenever the inference algorithm determines that a target can be made from -more than one prerequisite and the inference chains for the two methods -are the same length the algorithm reports an ambiguity and prints the -ambiguous inference chains. -.PP -.B dmake -tries to -remove intermediate files resulting from transitive closure if the file -is not marked as being PRECIOUS, or the \fB\-u\fP flag was not given on the -command line, and if the inferred intermediate did not previously exist. -Intermediate targets that existed prior to being made are never removed. -This is in keeping with the philosophy that -.B dmake -should never remove things from the file system that it did not add. -If the special target .REMOVE is defined and has a recipe then -.B dmake -constructs a list of the intermediate files to be removed and makes them -prerequisites of .REMOVE. It then makes .REMOVE thereby removing the -prerequisites if the recipe of .REMOVE says to. Typically .REMOVE is defined -in the startup file as: -.RS -.sp -\&.REMOVE :; $(RM) $< -.RE -.SH "AUGMAKE META RULES" -As a subclass of the meta targets that is actually mapped to %-meta rules -.B dmake -understands several SYSV AUGMAKE targets transformations. This .<suffix> -special target construct transforms into the following %-meta rules: -.RS -.sp -\&.suff :; recipe -.sp -.RE -gets mapped into: -.RS -.sp -% : %.suff; recipe -.sp -.RE -.PP -.B dmake -also supports the old format special target .<suffix>.<suffix> -by identifying any rules -of this form and mapping them to the appropriate %-rule. So for example if -an old makefile contains the construct: -.RS -.sp -\&.c.o :; cc \-c $< \-o $@ -.sp -.RE -.B dmake -maps this into the following %-rule: -.RS -.sp -%.o : %.c; cc \-c $< \-o $@ -.sp -.RE -The following SYSV AUGMAKE special targets transformation must be -enabled by providing the \-A flag -on the command line or by setting the value of AUGMAKE to non\-NULL. -The construct -.RS -.sp -\&.c~.o :; recipe -.sp -.RE -gets mapped into: -.RS -.sp -%.o : s.%.c ; recipe -.sp -.RE -In general, a special target of the form .<str>~ is replaced by the %-rule -construct s.%.<str>, thereby providing support for the syntax used by SYSV -AUGMAKE for providing SCCS support. -When enabled, these mappings allow processing of existing SYSV -makefiles without modifications. -.RE -.SH "MAKING TARGETS" -In order to update a target \fBdmake\fP must execute a recipe. -When a recipe needs to be executed it is first expanded so that any macros -in the recipe text are expanded, and it is then either executed directly or -passed to a shell. -.B dmake -supports two types of recipes. The regular recipes and group recipes. -.PP -When a regular recipe is invoked \fBdmake\fP executes each line of the recipe -separately using a new copy of a shell if a shell is required. -Thus effects of commands do not generally persist across recipe lines -(e.g. cd requests in a recipe line do not carry over to the next recipe line). -This is true even in environments such as \fBMSDOS\fP, where dmake internally -sets the current working director to match the directory it was in before -the command was executed. -.PP -The decision on whether a shell is required to execute a command is based on -the value of the macro SHELLMETAS or on the specification of '+' or .USESHELL -for the current recipe or target respectively. -If any character in the value of -SHELLMETAS is found in the expanded recipe text-line or the use of a shell -is requested explicitly via '+' or .USESHELL then the command is -executed using a shell, otherwise the command is executed directly. -The shell that is used for execution is given by the value of the macro SHELL. -The flags that are passed to the shell are given by the value of SHELLFLAGS. -Thus \fBdmake\fP constructs the command line: -.sp -\t$(SHELL) $(SHELLFLAGS) $(expanded_recipe_command) -.sp -If the $(SHELLCMDQUOTE) macro is set its value is inserted before and after -the $(expanded_recipe_command) string. -.sp -Normally -.B dmake -writes the command line that it is about to invoke to standard output. -If the .SILENT attribute is set for the target or for -the recipe line (via @), then the recipe line is not echoed. -.PP -Group recipe processing is similar to that of regular recipes, except that -a shell is always invoked. The shell that is invoked is given by the value of -the macro GROUPSHELL, and its flags are taken from the value of the macro -GROUPFLAGS. If a target has the .PROLOG attribute set then -.B dmake -prepends to the shell script the recipe associated with the special target -\&.GROUPPROLOG, and if the attribute .EPILOG is set as well, then the recipe -associated with the special target .GROUPEPILOG is appended to the script -file. -This facility can be used to always prepend a common header and common trailer -to group recipes. -Group recipes are echoed to standard output just like standard recipes, but -are enclosed by lines beginning with [ and ]. -.PP -The recipe flags [+,\-,%,@] are recognized at the start of a recipe line -even if they appear in a macro. For example: -.RS -.sp -.nf -SH = + -all: -\t$(SH)echo hi -.fi -.sp -.RE -is completely equivalent to writing -.RS -.sp -.nf -SH = + -all: -\t+echo hi -.fi -.sp -.RE -.PP -The last step performed by -.B dmake -prior to running a recipe is to set the macro CMNDNAME to the name of the -command to execute (determined by finding the first white\-space ending token -in the command line). It then sets the macro CMNDARGS to be the remainder -of the line. -.B dmake -then expands the macro COMMAND which by default is set to -.RS -.sp -COMMAND = $(CMNDNAME) $(CMNDARGS) -.sp -.RE -The result of this final expansion is the command that will be executed. -The reason for this expansion is to allow for a different interface to -the argument passing facilities (esp. under DOS) than that provided by -.B dmake\fR.\fP -You can for example define COMMAND to be -.RS -.sp -COMMAND = $(CMNDNAME) @$(mktmp $(CMNDARGS)) -.sp -.RE -which dumps the arguments into a temporary file and runs the command -.RS -.sp -$(CMNDNAME) @/tmp/ASAD23043 -.sp -.RE -which has a much shorter argument list. It is now up to the command to -use the supplied argument as the source for all other arguments. -As an optimization, if COMMAND is not defined -.B dmake -does not perform the above expansion. On systems, such as UNIX, that -handle long command lines this provides a slight saving in processing the -makefiles. -.SH "MAKING LIBRARIES" -Libraries are easy to maintain using \fBdmake\fP. A library is a file -containing a collection of object files. -Thus to make a library you simply specify it as a target with the .LIBRARY -attribute set and specify its list of prerequisites. The prerequisites should -be the object members that are to go into the library. When -.B dmake -makes the library target it uses the .LIBRARY attribute to pass to the -prerequisites the .LIBMEMBER attribute and the name of the library. This -enables the file binding mechanism to look for the member in the library if an -appropriate object file cannot be found. -.B dmake -now supports \fBElf\fP libraries on systems that support \fBElf\fP and -hence supports, on those systems, long member file names. -A small example best illustrates this. -.RS -.nf -.sp -mylib.a .LIBRARY : mem1.o mem2.o mem3.o -\trules for making library... -\t# remember to remove .o's when lib is made -.sp -# equivalent to: '%.o : %.c ; ...' -\&.c.o :; rules for making .o from .c say -.sp -.fi -.RE -.B dmake -will use the .c.o rule for making the library members if appropriate .c files -can be found using the search rules. NOTE: this is not specific in any way -to C programs, they are simply used as an example. -.PP -.B dmake -tries to handle the old library construct format in a sensible way. -The construct -.I lib(member.o) -is separated and the \fIlib\fP portion is declared -as a library target. -The new target is defined -with the .LIBRARY attribute set and the \fImember.o\fP portion of the -construct is -declared as a prerequisite of the lib target. -If the construct \fIlib(member.o)\fP -appears as a prerequisite of a target in the -makefile, that target has the new name of the lib assigned as its -prerequisite. Thus the following example: -.RS -.sp -.nf -a.out : ml.a(a.o) ml.a(b.o); $(CC) \-o $@ $< - -\&.c.o :; $(CC) \-c $(CFLAGS) \-o $@ $< -%.a: -.RS -ar rv $@ $? -ranlib $@ -rm \-rf $? -.RE -.sp -.fi -.RE -constructs the following dependency -graph. -.RS -.sp -.nf -a.out : ml.a; $(CC) \-o $@ $< -ml.a .LIBRARY : a.o b.o - -%.o : %.c ; $(CC) -c $(CFLAGS) \-o $@ $< -%.a : -.RS -ar rv $@ $? -ranlib $@ -rm -rf $? -.RE -.sp -.fi -.RE -and making a.out then works as expected. -.PP -The same thing happens for any target of the form \fIlib((entry))\fP. -These targets have an -additional feature in that the \fIentry\fP target has the .SYMBOL attribute -set automatically. -.PP -NOTE: If the notion of entry points is supported by the archive and by -\fBdmake\fP (currently not the case) then -.B dmake -will search the archive for the entry point and return not only the -modification time of the member which defines the entry but also the name of -the member file. This name will then replace \fIentry\fP and will be used for -making the member file. Once bound to an archive member the .SYMBOL -attribute is removed from the target. -This feature is presently disabled as there is little standardization -among archive formats, and we have yet to find a makefile utilizing this -feature (possibly due to the fact that it is unimplemented in most versions -of UNIX Make). -.PP -Finally, when -.B dmake -looks for a library member it must first locate the library file. -It does so by first looking for the library relative to the current directory -and if it is not found it then looks relative to the current value of -$(TMD). This allows commonly used libraries to be kept near the root of -a source tree and to be easily found by -.B dmake\fR.\fP -.SH "KEEP STATE" -.B dmake -supports the keeping of state information for targets that it makes whenever -the macro .KEEP_STATE is assigned a value. The value of the macro should be -the name of a state file that will contain the state information. If state -keeping is enabled then each target that does not poses the .NOSTATE -attribute will have a record written into the state file indicating the -target's name, the current directory, the command used to update the target, -and which, if any, :: rule is being used. When you make this target again -if any of this information does not match the previous settings and the -target is not out dated it will still be re\-made. The assumption is that one -of the conditions above has changed and that we wish to remake the target. -For example, -state keeping is used in the maintenance of -.B dmake -to test compile different versions of the source using different compilers. -Changing the compiler causes the compilation flags to be modified and hence -all sources to be recompiled. -.PP -The state file is an ascii file and is portable, however it is -not in human readable form as the entries represent hash keys of the above -information. -.PP -The Sun Microsystem's Make construct -.RS -.sp -\&.KEEP_STATE : -.sp -.RE -is recognized and is mapped to \fB.KEEP_STATE:=_state.mk\fP. -The -.B dmake -version of state keeping does not include scanning C source files for -dependencies like Sun Make. This is specific to C programs and it was -felt that it does not belong in make. -.B dmake -instead provides the tool, \fBcdepend\fP, to scan C source files and to produce -depedency information. Users are free to modify cdepend to produce other -dependency files. (NOTE: -.B cdepend -does not come with the distribution at this time, but will be available in -a patch in the near future) -.SH "MULTI PROCESSING" -If the architecture supports it then \fBdmake\fP is capable of making a target's -prerequisites in parallel. \fBdmake\fP will make as much in parallel as it -can and use a number of child processes up to the maximum specified by -MAXPROCESS or by the value supplied to the \-P command line flag. -A parallel make is enabled by setting the value of MAXPROCESS (either directly -or via \-P option) to a value which is > 1. -\fBdmake\fP guarantees that all dependencies as specified in the makefile are -honored. A target will not be made until all of its prerequisites have been -made. Note that when you specify \fB-P 4\fP then four child processes are -run concurrently but \fBdmake\fP actually displays the fifth command it will -run immediately upon a child process becomming free. This is an artifact of -the method used to traverse the dependency graph and cannot be removed. -If a parallel make is being performed then the following restrictions on -parallelism are enforced. -.RS -.IP 1. -Individual recipe lines in a non-group recipe are performed sequentially in -the order in which they are specified within the makefile and in parallel with -the recipes of other targets. -.IP 2. -If a target contains multiple recipe definitions (cf. :: rules) then these are -performed sequentially in the order in which the :: rules are specified within -the makefile and in parallel with the recipes of other targets. -.IP 3. -If a target rule contains the `!' modifier, then the recipe is performed -sequentially for the list of outdated prerequisites and in parallel with the recipes of other targets. -.IP 4. -If a target has the .SEQUENTIAL attribute set then all of its prerequisites -are made sequentially relative to one another (as if MAXPROCESS=1), but in -parallel with other targets in the makefile. -.RE -.PP -Note: If you specify a parallel make then -the order of target update and the order in which the associated recipes are -invoked will not correspond to that displayed by the \-n flag. -.SH "CONDITIONALS" -.B dmake -supports a makefile construct called a \fIconditional\fR. It allows -the user -to conditionally select portions of makefile text for input processing -and to discard other portions. This becomes useful for -writing makefiles that are intended to function for more than one target -host and environment. The conditional expression is specified as follows: -.sp -.RS -.nf -\&.IF \fIexpression\fR - ... if text ... -\&.ELIF \fIexpression\fR - ... if text ... -\&.ELSE - ... else text ... -\&.END -.RE -.fi -.sp -The .ELSE and .ELIF portions are optional, and the conditionals may be -nested (ie. the text may contain another conditional). -\&.IF, .ELSE, and .END -may appear anywhere in the makefile, but a single conditional expression -may not span multiple makefiles. -.PP -\fIexpression\fR can be one of the following forms: -.sp -String evaluation -.br -\t<text> | <text> == <text> | <text> != <text> -.sp -Numeric evaluation -.br -\t<text> <= <text> | <text> >= <text> -.sp -Boolean evaluation -.br -\t( <text> ) | <text> || <text> | <text> && <text> -.sp -where \fItext\fR is either text or a macro expression. In any case, -before the comparison is made, the expression is expanded. The text -portions are then selected and compared. In the case of the numeric -comparisons enclosing quotes are removed after expanding the expressions -and the leading numerical parts are converted to an integer number. If no -numerical part is found this results to 0 (zero). The -string "12ab" for example evaluates to the number 12. -Expressions can be nested with () and the use of || or &&. -White space at the start and -end of the text portion is discarded before the comparison. This means -that a macro that evaluates to nothing but white space is considered a -NULL value for the purpose of the comparison. -In the first case the expression evaluates TRUE if the text is not NULL -otherwise it evaluates FALSE. The remaining two cases both evaluate the -expression on the basis of a string comparison. -If a macro expression needs to be equated to a NULL string then compare it to -the value of the macro $(NULL). -You can use the $(shell ...) macro to construct more complex test expressions. -.SH "EXAMPLES" -.RS -.nf -.sp -# A simple example showing how to use make -# -prgm : a.o b.o - cc a.o b.o \-o prgm -a.o : a.c g.h - cc a.c \-o $@ -b.o : b.c g.h - cc b.c \-o $@ -.fi -.RE -.sp -In the previous -example prgm is remade only if a.o and/or b.o is out of date with -respect to prgm. -These dependencies can be stated more concisely -by using the inference rules defined in the standard startup file. -The default rule for making .o's from .c's looks something like this: -.sp -\&\t%.o : %.c; cc \-c $(CFLAGS) \-o $@ $< -.sp -Since there exists a rule (defined in the startup file) -for making .o's from .c's -\fBdmake\fR will use that rule -for manufacturing a .o from a .c and we can specify our dependencies -more concisely. -.sp -.RS -.nf -prgm : a.o b.o - cc \-o prgm $< -a.o b.o : g.h -.fi -.RE -.sp -A more general way to say the above using the new macro expansions -would be: -.sp -.RS -.nf -SRC = a b -OBJ = {$(SRC)}.o -.sp -prgm : $(OBJ) - cc \-o $@ $< -.sp -$(OBJ) : g.h -.fi -.RE -.sp -If we want to keep the objects in a separate directory, called -objdir, then we would write -something like this. -.sp -.RS -.nf -SRC = a b -OBJ = {$(SRC)}.o -.sp -prgm : $(OBJ) - cc $< \-o $@ -.sp -$(OBJ) : g.h -\&%.o : %.c - $(CC) \-c $(CFLAGS) \-o $(@:f) $< - mv $(@:f) objdir - -\&.SOURCE.o : objdir # tell dmake to look here for .o's -.fi -.RE -.sp -An example of building library members would go something like this: -(NOTE: The same rules as above will be used to produce .o's from .c's) -.sp -.RS -.nf -SRC\t= a b -LIB\t= lib -LIBm\t= { $(SRC) }.o -.sp -prgm: $(LIB) - cc \-o $@ $(LIB) -.sp -$(LIB) .LIBRARY : $(LIBm) - ar rv $@ $< - rm $< -.fi -.RE -.sp -Finally, suppose that each of the source files in the previous example had -the `:' character in their target name. Then we would write the above example -as: -.sp -.RS -.nf -SRC\t= f:a f:b -LIB\t= lib -LIBm\t= "{ $(SRC) }.o" # put quotes around each token -.sp -prgm: $(LIB) - cc \-o $@ $(LIB) -.sp -$(LIB) .LIBRARY : $(LIBm) - ar rv $@ $< - rm $< -.fi -.RE -.SH "COMPATIBILITY" -There are two notable differences between -.B \fBdmake\fR -and the standard version of BSD UNIX 4.2/4.3 Make. -.RS -.IP 1. .3i -BSD UNIX 4.2/4.3 Make supports wild card filename expansion for -prerequisite names. Thus if a directory contains a.h, b.h and c.h, then a -line like -.sp -\ttarget: *.h -.sp -will cause UNIX make to expand the *.h into "a.h b.h c.h". \fBdmake\fR -does not support this type of filename expansion. -.IP 2. .3i -Unlike UNIX make, touching a library member causes \fBdmake\fR -to search the library for the member name and to update the library time stamp. -This is only implemented in the UNIX version. -MSDOS and other versions may not have librarians that keep file time stamps, -as a result \fBdmake\fR touches the library file itself, and prints a warning. -.RE -.PP -\fBdmake\fP is not compatible with GNU Make. In particular it does not -understand GNU Make's macro expansions that query the file system. -.PP -.B dmake -is fully compatible with SYSV AUGMAKE, and supports the following AUGMAKE -features: -.RS -.IP 1. .3i -GNU Make style \fBinclude\fP, and \fBif/else/endif\fP directives are allowed -in non-group recipes. -Thus, the word \fBinclude\fP appearing at -the start of a line that is not part of a gruop recipe will be mapped -to the ".INCLUDE" directive that \fBdamke\fP uses. -Similarly, the words \fBifeq\fP,\fBifneq\fP,\fBelif\fP,\fBelse\fP, -and \fBendif\fP are mapped to their corresponding \fBdmake\fP equivalents. -.IP 2. .3i -The macro modifier expression $(macro:str=sub) is understood and is equivalent -to the expression $(macro:s/str/sub), with the restriction that str must match -the following regular expression: -.sp -\tstr[ |\et][ |\et]* -.sp -(ie. str only matches at the end of a token where str is a suffix and is -terminated by a space, a tab, or end of line) -Normally \fIsub\fP is expanded before the substitution is made, if you specify -\-A on the command line then sub is not expanded. -.IP 3. -The macro % is defined to be $@ (ie. $% expands to the same value as $@). -.IP 4. -The AUGMAKE notion of libraries is handled correctly. -.IP 5. -Directories are always made if you specify \fB\-A\fP. This is consistent -with other UNIX versions of Make. -.IP 6. -Makefiles that utilize virtual targets to force making of other targets work -as expected if AUGMAKE special target handling is enabled. For example: -.sp -.nf -\tFRC: -\tmyprog.o : myprog.c $(FRC) ; ... -.fi -.sp -Works as expected if you issue the command -.sp -\t'\fBdmake\fP \-A FRC=FRC' -.sp -but fails with a 'don't know how to make FRC' -error message if you do not specify AUGMAKE special target handling via -the \-A flag (or by setting AUGMAKE:=yes internally). -.RE -.SH "LIMITS" -In some environments the length of an argument string is restricted. -(e.g. MSDOS command line arguments cannot be longer than 128 bytes if you are -using the standard command.com command interpreter as your shell, -.B dmake -text diversions may help in these situations.) -.SH "PORTABILITY" -To write makefiles that can be moved from one environment to another requires -some forethought. In particular you must define as macros all those things -that may be different in the new environment. -.B dmake -has two facilities that help to support writing portable makefiles, recursive -macros and conditional expressions. The recursive macros, allow one to define -environment configurations that allow different environments for similar types -of operating systems. For example the same make script can be used for SYSV and -BSD but with different macro definitions. -.PP -To write a makefile that is portable between UNIX and MSDOS requires both -features since in almost all cases you will need to define new recipes for -making targets. The recipes will probably be quite different since the -capabilities of the tools on each machine are different. Different -macros will be needed to help handle the smaller differences in the two -environments. -.SH FILES -Makefile, makefile, startup.mk (use dmake \-V to tell you where the startup -file is) -.SH "SEE ALSO" -sh(1), csh(1), touch(1), f77(1), pc(1), cc(1) -.br -S.I. Feldman \fIMake - A Program for Maintaining Computer Programs\fP -.SH "AUTHOR" -Dennis Vadura, dvadura@wticorp.com -.br -Many thanks to Carl Seger for his helpful suggestions, -and to Trevor John Thompson for his many excellent ideas and -informative bug reports. Many thanks also go to those on the -NET that have helped in making \fBdmake\fP one of the best Make tools -available. -.SH BUGS -Some system commands return non-zero status inappropriately. -Use -.B \-i -(`\-' within the makefile) to overcome the difficulty. -.PP -Some systems do not have easily accessible -time stamps for library members (MSDOS, AMIGA, etc) -for these \fBdmake\fR uses the time stamp of the library instead and prints -a warning the first time it does so. This is almost always ok, except when -multiple makefiles update a single library file. In these instances it is -possible to miss an update if one is not careful. -.PP -This man page is way too long. -.SH WARNINGS -Rules supported by make(1) may not work if transitive closure is turned off -(-T, .NOINFER). -.PP -PWD from csh/ksh will cause problems if a cd operation is performed and --e or -E option is used. -.PP -Using internal macros such as COMMAND, may wreak havoc if you don't understand -their functionality. |