AC_PREREQ([2.57])
m4_define([milkway_major], 0)
m4_define([milkway_minor], 0)
m4_define([milkway_micro], 1)

m4_define([milkway_version],[milkway_major.milkway_minor.milkway_micro])

AC_INIT(milkway, milkway_version, "Luo Jinghua <sunmoon1997@gmail.com>", milkway)
AM_INIT_AUTOMAKE([dist-bzip2])

AM_CONFIG_HEADER(config.h)
AC_CONFIG_MACRO_DIR([m4])
AC_SUBST(ACLOCAL_AMFLAGS, "-I m4")

AC_PROG_CC
AM_PROG_CC_C_O
AC_PROG_LIBTOOL
AC_CHECK_FUNCS([getisax])
AC_C_BIGENDIAN
AC_C_INLINE

m4_define([lt_current], [milkway_minor])
m4_define([lt_revision], [milkway_micro])
m4_define([lt_age], [milkway_minor])

LT_VERSION_INFO="lt_current:lt_revision:lt_age"

MILKWAY_VERSION_MAJOR=milkway_major()
AC_SUBST(MILKWAY_VERSION_MAJOR)
MILKWAY_VERSION_MINOR=milkway_minor()
AC_SUBST(MILKWAY_VERSION_MINOR)
MILKWAY_VERSION_MICRO=milkway_micro()
AC_SUBST(MILKWAY_VERSION_MICRO)

AC_SUBST(LT_VERSION_INFO)

# Check for dependencies
#PKG_CHECK_MODULES(DEP, x11)

changequote(,)dnl
if test "x$GCC" = "xyes"; then
  case " $CFLAGS " in
  *[\ \	]-Wall[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wall" ;;
  esac fi changequote([,])dnl

dnl AC_PATH_PROG(PERL, perl, no)
dnl if test "x$PERL" = xno; then
dnl    AC_MSG_ERROR([Perl is required to build milkway.])
dnl fi
dnl AC_SUBST(PERL)

dnl =========================================================================
dnl -fvisibility stuff

have_gcc4=no
AC_MSG_CHECKING(for -fvisibility)
AC_COMPILE_IFELSE([
#if defined(__GNUC__) && (__GNUC__ >= 4)
#else
error Need GCC 4.0 for visibility
#endif
int main () { return 0; }
], have_gcc4=yes)

if test "x$have_gcc4" = "xyes"; then
   CFLAGS="$CFLAGS -fvisibility=hidden"
fi
AC_MSG_RESULT($have_gcc4)

have_sunstudio8=no
AC_MSG_CHECKING([for -xldscope (Sun compilers)])
AC_COMPILE_IFELSE([
#if defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
#else
error Need Sun Studio 8 for visibility
#endif
int main () { return 0; }
], have_sunstudio8=yes)

if test "x$have_sunstudio8" = "xyes"; then
   CFLAGS="$CFLAGS -xldscope=hidden"
fi
AC_MSG_RESULT($have_sunstudio8)

dnl ===========================================================================

PKG_PROG_PKG_CONFIG()
if test "x$PKG_CONFIG" = x; then
	AC_MSG_ERROR([pkg-config >= $PKGCONFIG_REQUIRED required but not found (http://pkgconfig.freedesktop.org/)])
fi

dnl Check for recent pkg-config which supports Requires.private
case `$PKG_CONFIG --version` in
[0.?|0.?.?|0.1[0-7]|0.1[0-7].?]) PKGCONFIG_REQUIRES="Requires"; ;;
*) PKGCONFIG_REQUIRES="Requires.private"; ;;
esac

AC_SUBST(PKGCONFIG_REQUIRES)

AM_CONDITIONAL(CROSS_COMPILING, test "x$cross_compiling" = "xyes")
MILKWAY_BIGENDIAN
AC_ARG_ENABLE(atomic,
	      [AS_HELP_STRING([--disable-atomic],
			      [disable use of native atomic operations])],
	      [use_atomic=$enableval], [use_atomic=yes])
AS_IF([test "x$use_atomic" = "xyes"], [
  MILKWAY_CHECK_NATIVE_ATOMIC_PRIMITIVES
  MILKWAY_CHECK_ATOMIC_OP_NEEDS_MEMORY_BARRIER
])
AC_CHECK_SIZEOF(void *)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(size_t)

AC_MSG_CHECKING([for native Win32])
case "$host" in
  *-*-mingw*)
    milkway_os_win32=yes
    ;;
  *)
    milkway_os_win32=no
    ;;
esac
AC_MSG_RESULT([$milkway_os_win32])
AM_CONDITIONAL(OS_WIN32, test "$milkway_os_win32" = "yes")

AC_MSG_CHECKING([for Sun Solaris (non-POSIX ctime_r)])
case "$host" in
    *-*-solaris*)
	CFLAGS="$CFLAGS -D_POSIX_PTHREAD_SEMANTICS"
	solaris_posix_pthread=yes
	;;
    *)
	solaris_posix_pthread=no
	;;
esac
AC_MSG_RESULT([$solaris_posix_pthread])

dnl ====================================================================
dnl Library checks
dnl ====================================================================

AC_CHECK_LIBM
LIBS="$LIBS $LIBM"

AC_CHECK_LIB(rt, sched_yield, [RT_LIBS=-lrt], [RT_LIBS=])
MILKWAY_LIBS="$MILKWAY_LIBS $RT_LIBS"

has_shm_open=
AC_CHECK_LIB(rt, shm_open, [
	     SHM_LIBS=-lrt
	     has_shm_open=yes
	     ], [SHM_LIBS=])
AM_CONDITIONAL(HAVE_SHM, test "x$has_shm_open" = "xyes")
AC_SUBST(SHM_LIBS)

AC_CHECK_LIB(socket, connect, [SOCKET_LIBS=-lsocket], [SOCKET_LIBS=])
MILKWAYBOILERPLATE_LIBS=$SOCKET_LIBS
AC_SUBST(MILKWAYBOILERPLATE_LIBS)

dnl ====================================================================
dnl Header/function checks
dnl ====================================================================

dnl Checks for precise integer types
AC_CHECK_HEADERS([stdint.h inttypes.h sys/int_types.h])
AC_CHECK_TYPES([uint64_t])

dnl Check for socket support
AC_CHECK_HEADERS([fcntl.h unistd.h signal.h sys/stat.h sys/socket.h sys/poll.h sys/un.h strings.h])

dnl Check for infinite loops
AC_CHECK_FUNCS([alarm])

dnl check for CPU affinity support
AC_CHECK_HEADERS([sched.h], [AC_CHECK_FUNCS([sched_getaffinity])])

dnl check for mmap support
AC_CHECK_HEADERS([sys/mman.h], [AC_CHECK_FUNCS([mmap])])

dnl check for clock_gettime() support
save_LIBS="$LIBS"
LIBS="$LIBS $RT_LIBS"
AC_CHECK_HEADERS([time.h], [AC_CHECK_FUNCS([clock_gettime])])
LIBS="$save_LIBS"

dnl check for GNU-extensions to fenv
AC_CHECK_HEADER(fenv.h,
	[AC_CHECK_FUNCS(feenableexcept fedisableexcept feclearexcept)])

dnl check for misc headers and functions
AC_CHECK_HEADERS([libgen.h byteswap.h signal.h setjmp.h fenv.h])
AC_CHECK_FUNCS([vasnprintf link ctime_r drand48 flockfile ffs])
AC_CHECK_HEADERS([sys/poll.h sys/select.h])
AC_CHECK_FUNCS([poll select])
AC_CHECK_HEADERS([stdarg.h])
AC_CHECK_FUNCS([strcmp strcasecmp stricmp memcpy memmove])

dnl check for win32 headers (this detects mingw as well)
AC_CHECK_HEADERS([windows.h], have_windows=yes, have_windows=no)


dnl Possible headers for mkdir
AC_CHECK_HEADERS([sys/stat.h io.h])
AC_CHECK_FUNC(mkdir,
	      [AC_MSG_CHECKING([mkdir variant])
	      mkdir_variant="unknown"
	      save_CFLAGS="$CFLAGS"
	      CFLAGS=$WARN_CFLAGS
	      AC_TRY_COMPILE([
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
		      ],
		      [mkdir ("hello.world", 0777)],
		      mkdir_variant="mkdir(path, mode)",
		      [AC_TRY_COMPILE([
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
			      ],
			      [mkdir ("hello.world")],
			      mkdir_variant="mkdir(path)")])
	      AC_MSG_RESULT([$mkdir_variant])
	      CFLAGS="$save_CFLAGS"
	      if test "x$mkdir_variant" = "xmkdir(path, mode)"; then
		  AC_DEFINE(HAVE_MKDIR, 2,
			    [Define to non-zero if your system has mkdir, and to 2 if your version of mkdir requires a mode parameter])
	      else
		  AC_DEFINE(HAVE_MKDIR, 1,
			    [Define to non-zero if your system has mkdir, and to 2 if your version of mkdir requires a mode parameter])
	      fi])

# Checks for library functions.
AC_CHECK_FUNCS([gettimeofday memmove memset select])

dnl Use lots of warning flags with with gcc and compatible compilers

dnl Note: if you change the following variable, the cache is automatically
dnl skipped and all flags rechecked.  So there's no need to do anything
dnl else.  If for any reason you need to force a recheck, just change
dnl MAYBE_WARN in an ignorable way (like adding whitespace)

# -Wcast-align generates lots of false positive reports we need to
# cast image data from uint8_t to uin32_t.

MAYBE_WARN="-Wall -Wextra \
-Wold-style-definition \
-Wmissing-declarations -Werror-implicit-function-declaration \
-Wnested-externs -Wpointer-arith -Wwrite-strings \
-Wsign-compare -Wstrict-prototypes -Wmissing-prototypes \
-Wpacked -Wswitch-enum -Wmissing-format-attribute \
-Wbad-function-cast -Wvolatile-register-var \
-Wstrict-aliasing=2 -Winit-self -Wunsafe-loop-optimizations \
-Wno-missing-field-initializers -Wno-unused-parameter \
-Wno-attributes -Wno-long-long -Winline"

dnl Sun Studio 12 likes to rag at us for abusing enums like
dnl having milkway_status_t variables hold milkway_int_status_t
dnl values.  It's bad, we know.  Now please be quiet.
MAYBE_WARN="$MAYBE_WARN -erroff=E_ENUM_TYPE_MISMATCH_ARG \
			-erroff=E_ENUM_TYPE_MISMATCH_OP"

dnl We also abuse the warning-flag facility to enable other compiler
dnl options.  Namely, the following:
MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common"

dnl Also to turn various gcc/glibc-specific preprocessor checks
MAYBE_WARN="$MAYBE_WARN -Wp,-D_FORTIFY_SOURCE=2"

# invalidate cached value if MAYBE_WARN has changed
if test "x$milkway_cv_warn_maybe" != "x$MAYBE_WARN"; then
	unset milkway_cv_warn_cflags
fi
AC_CACHE_CHECK([for supported warning flags], milkway_cv_warn_cflags, [
	echo
	WARN_CFLAGS=""

	# Some warning options are not supported by all versions of
	# gcc, so test all desired options against the current
	# compiler.
	#
	# Note that there are some order dependencies
	# here. Specifically, an option that disables a warning will
	# have no net effect if a later option then enables that
	# warnings, (perhaps implicitly). So we put some grouped
	# options (-Wall and -Wextra) up front and the -Wno options
	# last.

	for W in $MAYBE_WARN; do
		MILKWAY_CC_TRY_FLAG([$W],, [WARN_CFLAGS="$WARN_CFLAGS $W"])
	done

	milkway_cv_warn_cflags=$WARN_CFLAGS
	milkway_cv_warn_maybe=$MAYBE_WARN

	AC_MSG_CHECKING([which warning flags were supported])
])
WARN_CFLAGS="$milkway_cv_warn_cflags"
MILKWAY_CFLAGS="$MILKWAY_CFLAGS $WARN_CFLAGS"
AC_SUBST(WARN_CFLAGS)
AC_SUBST(MILKWAY_CFLAGS)
AC_SUBST(MILKWAY_LIBS)

# We only wish to enable attribute(warn_unused_result) if we can prevent
# gcc from generating thousands of warnings about the misapplication of the
# attribute to void functions and variables.
AC_CACHE_CHECK([how to enable unused result warnings], milkway_cv_warn_unused_result, [
	milkway_cv_warn_unused_result=""
	if echo $WARN_CFLAGS | grep -e '-Wno-attributes' >/dev/null; then
	    MILKWAY_CC_TRY_FLAG_SILENT(
			[-Wno-attributes],
			[__attribute__((__warn_unused_result__)) void f (void) {}
			 __attribute__((__warn_unused_result__)) int g;],
			[milkway_cv_warn_unused_result="__attribute__((__warn_unused_result__))"])
	fi
])
AC_DEFINE_UNQUOTED([WARN_UNUSED_RESULT], [$milkway_cv_warn_unused_result],
	  [Define to the value your compiler uses to support the warn-unused-result attribute])

AC_CHECK_HEADERS(dlfcn.h, [have_dlsym=yes], [have_dlsym=no])
AM_CONDITIONAL(MILKWAY_HAS_DL, test "x$have_dl" = "xyes")

ACX_PTHREAD
MILKWAY_LIBS="$MILKWAY_LIBS $PTHREAD_LIBS"
MILKWAY_CFLAGS="$MILKWAY_CFLAGS $PTHREAD_CFLAGS"

AC_ARG_ENABLE(gtk,
   [AC_HELP_STRING([--enable-gtk],
                   [enable tests using GTK+ [default=auto]])],
   [enable_gtk=$enableval], [enable_gtk=auto])

PKG_PROG_PKG_CONFIG
if test $enable_gtk = auto ; then
   PKG_CHECK_EXISTS([gtk+-2.0], [enable_gtk=yes], [enable_gtk=no])
fi
if test $enable_gtk = yes ; then
   PKG_CHECK_MODULES(GTK, [gtk+-2.0])
fi

AM_CONDITIONAL(HAVE_GTK, [test "x$enable_gtk" = xyes])

AC_SUBST(GTK_CFLAGS)
AC_SUBST(GTK_LIBS)
AC_SUBST(DEP_CFLAGS)
AC_SUBST(DEP_LIBS)

AC_OUTPUT([Makefile
	   server/Makefile
	   client/Makefile
	   milkway/Makefile
	   milkway/test/Makefile])