path: root/configure.ac

dnl -*- mode: m4 -*-
AC_PREREQ(2.52)

AC_INIT(dbus-glib, 0.81, [https://bugs.freedesktop.org/enter_bug.cgi?product=dbus])

AC_CANONICAL_TARGET

AM_INIT_AUTOMAKE([1.9])

AM_CONFIG_HEADER(config.h)

# Honor aclocal flags
ACLOCAL="$ACLOCAL $ACLOCAL_FLAGS"
AC_CONFIG_MACRO_DIR(m4)

GETTEXT_PACKAGE=dbus-glib-1
AC_SUBST(GETTEXT_PACKAGE)
AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE,"$GETTEXT_PACKAGE",[The name of the gettext domain])

 ## must come before we use the $USE_MAINTAINER_MODE variable later
AM_MAINTAINER_MODE

# libtool versioning - this applies to libdbus
#
# See http://sources.redhat.com/autobook/autobook/autobook_91.html#SEC91 for details
#

## increment if the interface has additions, changes, removals.
LT_CURRENT=3

## increment any time the source changes; set to
##  0 if you increment CURRENT
LT_REVISION=0

## increment if any interfaces have been added; set to 0
## if any interfaces have been changed or removed. removal has
## precedence over adding, so set to 0 if both happened.
LT_AGE=1

AC_SUBST(LT_CURRENT)
AC_SUBST(LT_REVISION)
AC_SUBST(LT_AGE)


AC_PROG_CC
AC_ISC_POSIX
AC_HEADER_STDC

AC_ARG_ENABLE(tests, AS_HELP_STRING([--enable-tests],[enable unit test code]),enable_tests=$enableval,enable_tests=$USE_MAINTAINER_MODE)
AC_ARG_ENABLE(ansi, AS_HELP_STRING([--enable-ansi],[enable -ansi -pedantic gcc flags]),enable_ansi=$enableval,enable_ansi=no)
AC_ARG_ENABLE(verbose-mode, AS_HELP_STRING([--enable-verbose-mode],[support verbose debug mode]),enable_verbose_mode=$enableval,enable_verbose_mode=$USE_MAINTAINER_MODE)
AC_ARG_ENABLE(asserts, AS_HELP_STRING([--enable-asserts],[include assertion checks]),enable_asserts=$enableval,enable_asserts=$USE_MAINTAINER_MODE)
AC_ARG_ENABLE(checks, AS_HELP_STRING([--enable-checks],[include sanity checks on public API]),enable_checks=$enableval,enable_checks=yes)
AC_ARG_ENABLE(doxygen-docs, AS_HELP_STRING([--enable-doxygen-docs],[build DOXYGEN documentation (requires Doxygen)]),enable_doxygen_docs=$enableval,enable_doxygen_docs=auto)
AC_ARG_ENABLE(gcov, AS_HELP_STRING([--enable-gcov],[compile with coverage profiling instrumentation (gcc only)]),enable_gcov=$enableval,enable_gcov=no)
AC_ARG_ENABLE(bash-completion, AS_HELP_STRING([--enable-bash-completion],[install bash completion scripts]),enable_bash_completion=$enableval,enable_bash_completion=yes)
AC_ARG_WITH(test-socket-dir, AS_HELP_STRING([--with-test-socket-dir=[dirname]],[Where to put sockets for make check]))


AC_ARG_WITH(introspect-xml, AS_HELP_STRING([--with-introspect-xml=[filename]],[Pass in a pregenerated dbus daemon introspection xml file (as generated by 'dbus-daemon --introspect') to use instead of querying the installed dbus daemon]))


AM_CONDITIONAL(DBUS_BASH_COMPLETION, test x$enable_bash_completion = xyes)
if test x$enable_bash_completion = xyes; then
  AC_DEFINE(DBUS_BASH_COMPLETION,1,[Enable bash completion])
fi

if test x$enable_verbose_mode = xyes; then
    AC_DEFINE(DBUS_ENABLE_VERBOSE_MODE,1,[Support a verbose mode])
fi

AC_ARG_WITH(dbus-binding-tool,
  AS_HELP_STRING([--with-dbus-binding-tool=[filename]],[Use external dbus-binding-tool program]),
  [DBUS_BINDING_TOOL=$withval],[DBUS_BINDING_TOOL=\$\(top_builddir\)/dbus/dbus-binding-tool])
AC_SUBST(DBUS_BINDING_TOOL)


dnl DBUS_BUILD_TESTS controls unit tests built in to .c files 
dnl and also some stuff in the test/ subdir
AM_CONDITIONAL(DBUS_BUILD_TESTS, test x$enable_tests = xyes)
if test x$enable_tests = xyes; then
    AC_DEFINE(DBUS_BUILD_TESTS,1,[Build test code])
fi

if test x$enable_verbose_mode = xyes; then
    AC_DEFINE(DBUS_ENABLE_VERBOSE_MODE,1,[Support a verbose mode])
fi
if test x$enable_asserts = xno; then
    AC_DEFINE(DBUS_DISABLE_ASSERT,1,[Disable assertion checking])
    AC_DEFINE(G_DISABLE_ASSERT,1,[Disable GLib assertion macros])
fi
if test x$enable_checks = xno; then
    AC_DEFINE(DBUS_DISABLE_CHECKS,1,[Disable public API sanity checking])
    AC_DEFINE(G_DISABLE_CHECKS,1,[Disable GLib public API sanity checking])
fi

#### gcc warning flags

AC_DEFUN([AC_CC_TRY_FLAG], [
  AC_MSG_CHECKING([whether gcc understands $1])

  ac_save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $1"

  AC_COMPILE_IFELSE([ ], [ac_cc_flag=yes], [ac_cc_flag=no])
  CFLAGS="$ac_save_CFLAGS"

  if test "x$ac_cc_flag" = "xyes"; then
    ifelse([$2], , :, [$2])
  else
    ifelse([$3], , :, [$3])
  fi
  AC_MSG_RESULT([$ac_cc_flag])
])

if test "x$GCC" = "xyes"; then
  AC_CC_TRY_FLAG([-Wfloat-equal],
                 [ac_flag_float_equal=yes],
                 [ac_flag_float_equal=no])

  changequote(,)dnl
  case " $CFLAGS " in
  *[\ \	]-Wall[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wall" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-Wchar-subscripts[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wchar-subscripts" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-Wmissing-declarations[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wmissing-declarations" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-Wmissing-prototypes[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wmissing-prototypes" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-Wnested-externs[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wnested-externs" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-Wpointer-arith[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wpointer-arith" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-Wcast-align[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wcast-align" ;;
  esac

  if test "x$ac_flag_float_equal" = "xyes"; then
    case " $CFLAGS " in
    *[\ \	]-Wfloat-equal[\ \	]*) ;;
    *) CFLAGS="$CFLAGS -Wfloat-equal" ;;
    esac
  fi

  case " $CFLAGS " in
  *[\ \	]-Wsign-compare[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wsign-compare" ;;
  esac
  
  # This one is special - it's not a warning override.
  # http://bugs.freedesktop.org/show_bug.cgi?id=10599
  # is the bug for DBus core.
  case " $CFLAGS " in
  *[\ \	]-fno-strict-aliasing[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -fno-strict-aliasing" ;;
  esac  

  if test "x$enable_ansi" = "xyes"; then
    case " $CFLAGS " in
    *[\ \	]-ansi[\ \	]*) ;;
    *) CFLAGS="$CFLAGS -ansi" ;;
    esac

    case " $CFLAGS " in
    *[\ \	]-D_POSIX_C_SOURCE*) ;;
    *) CFLAGS="$CFLAGS -D_POSIX_C_SOURCE=199309L" ;;
    esac

    case " $CFLAGS " in
    *[\ \	]-D_BSD_SOURCE[\ \	]*) ;;
    *) CFLAGS="$CFLAGS -D_BSD_SOURCE" ;;
    esac

    case " $CFLAGS " in
    *[\ \	]-pedantic[\ \	]*) ;;
    *) CFLAGS="$CFLAGS -pedantic" ;;
    esac
  fi
  if test x$enable_gcov = xyes; then
    case " $CFLAGS " in
    *[\ \	]-fprofile-arcs[\ \	]*) ;;
    *) CFLAGS="$CFLAGS -fprofile-arcs" ;;
    esac
    case " $CFLAGS " in
    *[\ \	]-ftest-coverage[\ \	]*) ;;
    *) CFLAGS="$CFLAGS -ftest-coverage" ;;
    esac

    ## remove optimization
    CFLAGS=`echo "$CFLAGS" | sed -e 's/-O[0-9]*//g'`
  fi
  changequote([,])dnl
else
  if test x$enable_gcov = xyes; then
    AC_MSG_ERROR([--enable-gcov can only be used with gcc])
  fi
fi

AM_PROG_LIBTOOL

changequote(,)dnl
# compress spaces in flags
CFLAGS=`echo "$CFLAGS" | sed -e 's/ +/ /g'`
CPPFLAGS=`echo "$CPPFLAGS" | sed -e 's/ +/ /g'`
changequote([,])dnl

if test x$enable_gcov = xyes; then
     ## so that config.h changes when you toggle gcov support
     AC_DEFINE_UNQUOTED(DBUS_GCOV_ENABLED, 1, [Defined if gcov is enabled to force a rebuild due to config.h changing])

     AC_MSG_CHECKING([for gcc 3.3 version of gcov file format])
     have_gcc33_gcov=no
     AC_RUN_IFELSE( [AC_LANG_PROGRAM( , [[ if (__GNUC__ >=3 && __GNUC_MINOR__ >= 3) exit (0); else exit (1); ]])],  
                   have_gcc33_gcov=yes)
     if test x$have_gcc33_gcov = xyes ; then
         AC_DEFINE_UNQUOTED(DBUS_HAVE_GCC33_GCOV, 1, [Defined if we have gcc 3.3 and thus the new gcov format])
     fi
     AC_MSG_RESULT($have_gcc33_gcov)
fi
AM_CONDITIONAL(DBUS_GCOV_ENABLED, test x$enable_gcov = xyes)


#### Various functions
AC_SEARCH_LIBS([socket], [socket])

dnl check for socklen_t
AC_MSG_CHECKING(whether socklen_t is defined)
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
],[
socklen_t foo;
foo = 1;
],dbus_have_socklen_t=yes,dbus_have_socklen_t=no)
AC_MSG_RESULT($dbus_have_socklen_t)

if test "x$dbus_have_socklen_t" = "xyes"; then
    AC_DEFINE(HAVE_SOCKLEN_T,1,[Have socklen_t type])
fi

#### Abstract sockets

AC_LANG_PUSH(C)
AC_CACHE_CHECK([abstract socket namespace],
		ac_cv_have_abstract_sockets,
		[AC_RUN_IFELSE([AC_LANG_PROGRAM(
[[
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
]],
[[
  int listen_fd;
  struct sockaddr_un addr;
  
  listen_fd = socket (PF_UNIX, SOCK_STREAM, 0);
  
  if (listen_fd < 0)
    {
      fprintf (stderr, "socket() failed: %s\n", strerror (errno));
      exit (1);
    }

  memset (&addr, '\0', sizeof (addr));
  addr.sun_family = AF_UNIX;
  strcpy (addr.sun_path, "X/tmp/dbus-fake-socket-path-used-in-configure-test");
  addr.sun_path[0] = '\0'; /* this is what makes it abstract */
  
  if (bind (listen_fd, (struct sockaddr*) &addr, SUN_LEN (&addr)) < 0)
    {
       fprintf (stderr, "Abstract socket namespace bind() failed: %s\n", 
                strerror (errno));
       exit (1);
    }
  else 
    exit (0);
]])],
              [ac_cv_have_abstract_sockets=yes],
              [ac_cv_have_abstract_sockets=no]
)])
AC_LANG_POP(C)

if test x$enable_abstract_sockets = xyes; then
    if test x$ac_cv_have_abstract_sockets = xno; then
	AC_MSG_ERROR([Abstract sockets explicitly required, and support not detected.])
    fi
fi

if test x$enable_abstract_sockets = xno; then
   ac_cv_have_abstract_sockets=no;
fi

if test x$ac_cv_have_abstract_sockets = xyes ; then
   DBUS_PATH_OR_ABSTRACT=abstract
   AC_DEFINE(HAVE_ABSTRACT_SOCKETS,1,[Have abstract socket namespace])
else
   DBUS_PATH_OR_ABSTRACT=path
fi

# this is used in addresses to prefer abstract, e.g. 
# unix:path=/foo or unix:abstract=/foo 
AC_SUBST(DBUS_PATH_OR_ABSTRACT)

#### Sort out gettext

# this makes us require GLib to run autoconf, but not at runtime
ALL_LINGUAS=""
AM_GLIB_GNU_GETTEXT

# INTLLIBS is now set

# (if someone wants to go through and make internationalization 
#  conditional with #ifdef ENABLE_NLS then go crazy and send us a patch, 
#  but right now we won't build without gettext)
if test "$gt_cv_have_gettext" != "yes" ; then
  AC_MSG_ERROR([
*** You must have either have gettext support in your C library, or use the 
*** GNU gettext library. (http://www.gnu.org/software/gettext/gettext.html
])
fi

#### Sort out XML library

# see what we have
AC_CHECK_LIB(expat, XML_ParserCreate_MM,
             [ AC_CHECK_HEADERS(expat.h, have_expat=true, have_expat=false) ],
             have_expat=false)

if ! $have_expat ; then
  AC_MSG_ERROR([expat library not found, check config.log for failed attempts])
fi

XML_LIBS=-lexpat
XML_CFLAGS=


#### Set up final flags

PKG_CHECK_MODULES(DBUS, dbus-1 >= 1.1, have_dbus=yes, have_dbus=no)

if test x$have_dbus = xno ; then
    AC_MSG_ERROR([DBus development libraries not found])
fi
AM_CONDITIONAL(HAVE_DBUS, test x$have_dbus = xyes)

AC_SUBST(DBUS_CFLAGS)
AC_SUBST(DBUS_LIBS)

DBUS_INCLUDEDIR=`pkg-config dbus-1 --variable=includedir`
AC_SUBST(DBUS_INCLUDEDIR)
DBUS_DAEMONDIR=`pkg-config dbus-1 --variable=daemondir`
if test x"$DBUS_DAEMONDIR" != "x"; then
    # Add slash, so that if the D-Bus pkgconfig file does not
    # specify daemondir, the tools/Makefile.am file will look
    # in the PATH for the daemon, as was previous behavior.
    #
    DBUS_DAEMONDIR="$DBUS_DAEMONDIR/"
fi
AC_SUBST(DBUS_DAEMONDIR)

# Glib detection
PKG_CHECK_MODULES(DBUS_GLIB, gobject-2.0 >= 2.10, have_glib=yes, have_glib=no)
PKG_CHECK_MODULES(DBUS_GLIB_THREADS, gthread-2.0 >= 2.6, have_glib_threads=yes, have_glib_threads=no)

if test x$have_glib = xno ; then
    AC_MSG_ERROR([GLib development libraries not found])
fi

AM_CONDITIONAL(HAVE_GLIB, test x$have_glib = xyes)
AM_CONDITIONAL(HAVE_GLIB_THREADS, test x$have_glib_threads = xyes)

GLIB_GENMARSHAL=`$PKG_CONFIG --variable=glib_genmarshal glib-2.0`
AC_SUBST(GLIB_GENMARSHAL)

dnl GLib flags
AC_SUBST(DBUS_GLIB_CFLAGS)
AC_SUBST(DBUS_GLIB_LIBS)
AC_SUBST(DBUS_GLIB_THREADS_LIBS)

DBUS_GLIB_TOOL_CFLAGS=$XML_CFLAGS
DBUS_GLIB_TOOL_LIBS="$XML_LIBS $INTLLIBS"
AC_SUBST(DBUS_GLIB_TOOL_CFLAGS)
AC_SUBST(DBUS_GLIB_TOOL_LIBS)

### gtk-doc Documentation
GTK_DOC_CHECK(1.4)

### Doxygen Documentation

AC_PATH_PROG(DOXYGEN, doxygen, no)

AC_MSG_CHECKING([whether to build Doxygen documentation])

if test x$DOXYGEN = xno ; then
    have_doxygen=no
else
    have_doxygen=yes
fi

if test x$enable_doxygen_docs = xauto ; then
    if test x$have_doxygen = xno ; then
        enable_doxygen_docs=no
    else
        enable_doxygen_docs=yes
    fi
fi

if test x$enable_doxygen_docs = xyes; then
    if test x$have_doxygen = xno; then
	AC_MSG_ERROR([Building Doxygen docs explicitly required, but Doxygen not found])
    fi
fi

AM_CONDITIONAL(DBUS_DOXYGEN_DOCS_ENABLED, test x$enable_doxygen_docs = xyes)
AC_MSG_RESULT(yes)

#### Have to go $localstatedir->$prefix/var->/usr/local/var   
#### someone please fix this a better way...

#### find the actual value for $prefix that we'll end up with
##   (I know this is broken and should be done in the Makefile, but
##    that's a major pain and almost nobody actually seems to care)
REAL_PREFIX=
if test "x$prefix" = "xNONE"; then
  REAL_PREFIX=$ac_default_prefix
else
  REAL_PREFIX=$prefix
fi

## temporarily change prefix and exec_prefix
old_prefix=$prefix
prefix=$REAL_PREFIX

if test "x$exec_prefix" = xNONE ; then
   REAL_EXEC_PREFIX=$REAL_PREFIX
else
   REAL_EXEC_PREFIX=$exec_prefix
fi
old_exec_prefix=$exec_prefix
exec_prefix=$REAL_EXEC_PREFIX

## eval everything
LOCALSTATEDIR_TMP="$localstatedir"
EXPANDED_LOCALSTATEDIR=`eval echo $LOCALSTATEDIR_TMP`
AC_SUBST(EXPANDED_LOCALSTATEDIR)

SYSCONFDIR_TMP="$sysconfdir"
EXPANDED_SYSCONFDIR=`eval echo $SYSCONFDIR_TMP`
AC_SUBST(EXPANDED_SYSCONFDIR)

BINDIR_TMP="$bindir"
EXPANDED_BINDIR=`eval echo $BINDIR_TMP`
AC_SUBST(EXPANDED_BINDIR)

LIBDIR_TMP="$libdir"
EXPANDED_LIBDIR=`eval echo $LIBDIR_TMP`
AC_SUBST(EXPANDED_LIBDIR)

DATADIR_TMP="$datadir"
EXPANDED_DATADIR=`eval echo $DATADIR_TMP`
AC_SUBST(EXPANDED_DATADIR)

## put prefix and exec_prefix back
prefix=$old_prefix
exec_prefix=$old_exec_prefix

#### Tell tests where to find certain stuff in builddir
ABSOLUTE_TOP_BUILDDIR=`cd ${ac_top_builddir}. && pwd`

AC_DEFUN([TEST_PATH], [
TEST_$1=${ABSOLUTE_TOP_BUILDDIR}/test/$2
AC_DEFINE_UNQUOTED(TEST_$1, "$TEST_$1",
                   [Full path to test file test/$2 in builddir])
AC_SUBST(TEST_$1)
])

TEST_PATH(SERVICE_DIR, data/valid-service-files)
TEST_PATH(SERVICE_BINARY, test-service)
TEST_PATH(SHELL_SERVICE_BINARY, test-shell-service)
TEST_PATH(CORE_SERVICE_BINARY, core/test-service-glib)
TEST_PATH(INTERFACES_SERVICE_BINARY, interfaces/test-service)
TEST_PATH(EXIT_BINARY, test-exit)
TEST_PATH(SEGFAULT_BINARY, test-segfault)
TEST_PATH(SLEEP_FOREVER_BINARY, test-sleep-forever)
AC_SUBST(ABSOLUTE_TOP_BUILDDIR)

if ! test -z "$with_test_socket_dir" ; then
   TEST_SOCKET_DIR="$with_test_socket_dir"
else
   TEST_SOCKET_DIR=$DEFAULT_SOCKET_DIR
fi
AC_SUBST(TEST_SOCKET_DIR)
AC_DEFINE_UNQUOTED(DBUS_TEST_SOCKET_DIR, "$TEST_SOCKET_DIR", [Where to put test sockets])

#### Test if we should generate daemon introspection xml
use_introspect_xml=false

if ! test -z "$with_introspect_xml" ; then
  use_introspect_xml=true
  INTROSPECT_XML_PATH="$with_introspect_xml"
  AC_DEFINE(INTROSPECT_XML_PATH, "$INTROSPECT_XML_PATH", [Path to pregenerated xml for dbus daemon introspection])
  AC_SUBST(INTROSPECT_XML_PATH)
fi

AM_CONDITIONAL(USE_INTROSPECT_XML, $use_introspect_xml)

AC_OUTPUT([
Makefile
m4/Makefile
doc/Makefile
doc/reference/Makefile
doc/reference/version.xml
dbus/Makefile
dbus/examples/Makefile
dbus/examples/statemachine/Makefile
test/Makefile
test/core/Makefile
test/interfaces/Makefile
test/data/valid-service-files/debug-glib.service
test/data/valid-service-files/debug-echo.service
test/data/valid-service-files/interfaces-test.service
tools/Makefile
dbus-glib-1.pc
dbus-glib-1-uninstalled.pc
Doxyfile
])

dnl ==========================================================================
echo "
                    D-BUS GLIB BINDINGS $VERSION
                  ==============

	prefix:                   ${prefix}
	exec_prefix:              ${exec_prefix}
        libdir:                   ${EXPANDED_LIBDIR}
        bindir:                   ${EXPANDED_BINDIR}
        sysconfdir:               ${EXPANDED_SYSCONFDIR}
        localstatedir:            ${EXPANDED_LOCALSTATEDIR}
	datadir:                  ${EXPANDED_DATADIR}
	source code location:	  ${srcdir}
	compiler:		  ${CC}
	cflags:		          ${CFLAGS}
	cppflags:		  ${CPPFLAGS}
        Doxygen:                  ${DOXYGEN}"

echo "
        Maintainer mode:          ${USE_MAINTAINER_MODE}
        gcc coverage profiling:   ${enable_gcov}
        Building unit tests:      ${enable_tests}
        Building verbose mode:    ${enable_verbose_mode}
        Building assertions:      ${enable_asserts}
        Building checks:          ${enable_checks}
        Building Doxygen docs:    ${enable_doxygen_docs}
        Building Gtk-doc docs:    ${enable_gtk_doc}
        Bash Completion:          ${enable_bash_completion}
        Gettext libs (empty OK):  ${INTLLIBS}
        Using XML parser:         ${with_xml}
        'make check' socket dir:  ${TEST_SOCKET_DIR}
"

if test x$enable_tests = xyes; then
        echo "NOTE: building with unit tests increases the size of the installed library and renders it insecure."
fi
if test x$enable_tests = xyes -a x$enable_asserts = xno; then
        echo "NOTE: building with unit tests but without assertions means tests may not properly report failures (this configuration is only useful when doing something like profiling the tests)"
fi
if test x$enable_gcov = xyes; then
        echo "NOTE: building with coverage profiling is definitely for developers only."
fi
if test x$enable_verbose_mode = xyes; then
        echo "NOTE: building with verbose mode increases library size, may slightly increase security risk, and decreases performance."
fi
if test x$enable_asserts = xyes; then
        echo "NOTE: building with assertions increases library size and decreases performance."
fi
if test x$enable_checks = xno; then
        echo "NOTE: building without checks for arguments passed to public API makes it harder to debug apps using D-BUS, but will slightly decrease D-BUS library size and _very_ slightly improve performance."
fi