configure.in 91.3 KB
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# Process this file with autoconf to produce a configure script.
# require autoconf 2.54
AC_PREREQ(2.54)

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dnl ***********************************
dnl *** include special GLib macros ***
dnl ***********************************
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m4_define(glib_configure_in)
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#
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# The following version number definitions apply to GLib, GModule, GObject 
# and GThread as a whole, so if changes occoured in any of them, they are all
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# treated with the same interface and binary age.
#
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# Making releases:
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#   glib_micro_version += 1;
#   glib_interface_age += 1;
#   glib_binary_age += 1;
# if any functions have been added, set glib_interface_age to 0.
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# if backwards compatibility has been broken,
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# set glib_binary_age _and_ glib_interface_age to 0.
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#
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m4_define([glib_major_version], [2])
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m4_define([glib_minor_version], [15])
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m4_define([glib_micro_version], [4])
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m4_define([glib_interface_age], [0])
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m4_define([glib_binary_age],
          [m4_eval(100 * glib_minor_version + glib_micro_version)])
m4_define([glib_version],
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          [glib_major_version.glib_minor_version.glib_micro_version])
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# libtool version related macros
m4_define([glib_lt_release], [glib_major_version.glib_minor_version])
m4_define([glib_lt_current],
          [m4_eval(100 * glib_minor_version + glib_micro_version - glib_interface_age)])
m4_define([glib_lt_revision], [glib_interface_age])
m4_define([glib_lt_age], [m4_eval(glib_binary_age - glib_interface_age)])
m4_define([glib_lt_current_minus_age],
          [m4_eval(glib_lt_current - glib_lt_age)])

# if the minor version number is odd, then we want debugging.  Otherwise
# we only want minimal debugging support.
m4_define([glib_debug_default],
          [m4_if(m4_eval(glib_minor_version % 2), [1], [yes], [minimum])])dnl


AC_INIT(glib, [glib_version],
        [http://bugzilla.gnome.org/enter_bug.cgi?product=glib])

AC_CONFIG_SRCDIR([glib/glib.h])

# Save this value here, since automake will set cflags later
cflags_set=${CFLAGS+set}

AM_INIT_AUTOMAKE([no-define])

# Specify a configuration file
AM_CONFIG_HEADER([config.h])


GLIB_MAJOR_VERSION=glib_major_version
GLIB_MINOR_VERSION=glib_minor_version
GLIB_MICRO_VERSION=glib_micro_version
GLIB_INTERFACE_AGE=glib_interface_age
GLIB_BINARY_AGE=glib_binary_age
GLIB_VERSION=glib_version
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AC_SUBST(GLIB_MAJOR_VERSION)
AC_SUBST(GLIB_MINOR_VERSION)
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AC_SUBST(GLIB_MICRO_VERSION)
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AC_SUBST(GLIB_VERSION)
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AC_SUBST(GLIB_INTERFACE_AGE)
AC_SUBST(GLIB_BINARY_AGE)
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AC_DEFINE(GLIB_MAJOR_VERSION, [glib_major_version],
	  [Define to the GLIB major version])
AC_DEFINE(GLIB_MINOR_VERSION, [glib_minor_version],
	  [Define to the GLIB minor version])
AC_DEFINE(GLIB_MICRO_VERSION, [glib_micro_version],
	  [Define to the GLIB micro version])
AC_DEFINE(GLIB_INTERFACE_AGE, [glib_interface_age],
	  [Define to the GLIB interface age])
AC_DEFINE(GLIB_BINARY_AGE, [glib_binary_age],
	  [Define to the GLIB binary age])

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# libtool versioning
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LT_RELEASE=glib_lt_release
LT_CURRENT=glib_lt_current
LT_REVISION=glib_lt_revision
LT_AGE=glib_lt_age
LT_CURRENT_MINUS_AGE=glib_lt_current_minus_age
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AC_SUBST(LT_RELEASE)
AC_SUBST(LT_CURRENT)
AC_SUBST(LT_REVISION)
AC_SUBST(LT_AGE)
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AC_SUBST(LT_CURRENT_MINUS_AGE)
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dnl Initialize maintainer mode
AM_MAINTAINER_MODE

AC_CANONICAL_HOST

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AC_MSG_CHECKING([for the BeOS])
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case $host in
  *-*-beos*)
    glib_native_beos="yes"
    ;;
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  *)
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    glib_native_beos="no"
    ;;
esac
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AC_MSG_RESULT([$glib_native_beos])
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dnl
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AC_MSG_CHECKING([for Win32])
case "$host" in
  *-*-mingw*)
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    glib_native_win32=yes
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    GLIB_DEF=glib.def
    GMODULE_DEF=gmodule.def
    GOBJECT_DEF=gobject.def
    GTHREAD_DEF=gthread.def
    TESTGMODULE_EXP=testgmodule.exp
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    glib_pid_type='void *'
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    ;;
  *)
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    glib_native_win32=no
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    GLIB_DEF=
    GMODULE_DEF=
    GOBJECT_DEF=
    GTHREAD_DEF=
    TESTGMODULE_EXP=
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    glib_pid_type=int
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    ;;
esac
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case $host in
  *-*-linux*)
    glib_os_linux=yes
    ;;
esac

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AC_MSG_RESULT([$glib_native_win32])
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glib_have_carbon=no
AC_MSG_CHECKING([for Mac OS X Carbon support])
AC_TRY_CPP([
#include <Carbon/Carbon.h>
#include <CoreServices/CoreServices.h>
], glib_have_carbon=yes)

AC_MSG_RESULT([$glib_have_carbon])

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AM_CONDITIONAL(OS_WIN32, [test "$glib_native_win32" = "yes"])
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AM_CONDITIONAL(OS_UNIX, [test "$glib_native_win32" != "yes"])
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AM_CONDITIONAL(OS_LINUX, [test "$glib_os_linux" = "yes"])
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AM_CONDITIONAL(OS_CARBON, [test "$glib_have_carbon" = "yes"])
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AC_SUBST(GLIB_DEF)
AC_SUBST(GMODULE_DEF)
AC_SUBST(GOBJECT_DEF)
AC_SUBST(GTHREAD_DEF)
AC_SUBST(TESTGMODULE_EXP)

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if test "$glib_native_win32" = "yes"; then
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  AC_CHECK_TOOL(WINDRES, windres, no)
  if test "$WINDRES" = no; then
    AC_MSG_ERROR([*** Could not find an implementation of windres in your PATH.])
  fi
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  AC_CHECK_TOOL(NM, nm, no)
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  if test "$NM" = no; then
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    AC_MSG_ERROR([*** Could not find an implementation of nm in your PATH.])
  fi
  AC_CHECK_TOOL(RANLIB, ranlib, :)
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  AC_CHECK_PROG(ms_librarian, [lib.exe], [yes], [no])
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fi
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AM_CONDITIONAL(MS_LIB_AVAILABLE, [test x$ms_librarian = xyes])
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if test "$glib_native_win32" != yes; then
    # libtool option to control which symbols are exported
    # right now, symbols starting with _ are not exported
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    LIBTOOL_EXPORT_OPTIONS='-export-symbols-regex "^g.*"'
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else
    # We currently use .def files on Windows
    LIBTOOL_EXPORT_OPTIONS=
fi
AC_SUBST(LIBTOOL_EXPORT_OPTIONS)

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if test "x$glib_have_carbon" = "xyes"; then
  AC_DEFINE(HAVE_CARBON, 1, [define to 1 if Carbon is available])
  LDFLAGS="$LDFLAGS -framework Carbon"
fi


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dnl declare --enable-* args and collect ac_help strings
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AC_ARG_ENABLE(debug,
              AC_HELP_STRING([--enable-debug=@<:@no/minimum/yes@:>@],
                             [turn on debugging @<:@default=glib_debug_default@:>@]),,
              enable_debug=glib_debug_default)

AC_ARG_ENABLE(gc_friendly,
              [AC_HELP_STRING([--enable-gc-friendly],
                              [turn on garbage collector friendliness [default=no]])],,
              [enable_gc_friendly=no])
AC_ARG_ENABLE(mem_pools,
              [AC_HELP_STRING([--disable-mem-pools],
			      [disable all glib memory pools])],,
	      [disable_mem_pools=no])
AC_ARG_ENABLE(threads,
              [AC_HELP_STRING([--enable-threads],
                              [turn on basic thread support [default=yes]
([=no] will override --with-threads)])],,
              [enable_threads=yes])
AC_ARG_ENABLE(rebuilds,
              [AC_HELP_STRING([--disable-rebuilds],
                              [disable all source autogeneration rules])],,
              [enable_rebuilds=yes])
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AC_ARG_ENABLE(visibility,
              [AC_HELP_STRING([--disable-visibility],
                              [don't use ELF visibility attributes])],,
              [enable_visibility=yes])
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if test "x$enable_threads" != "xyes"; then
  enable_threads=no
fi
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AC_MSG_CHECKING([whether to enable garbage collector friendliness])
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if test "x$enable_gc_friendly" = "xyes"; then
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  AC_DEFINE(ENABLE_GC_FRIENDLY_DEFAULT, 1, [Whether to enable GC friendliness by default])
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  AC_MSG_RESULT([yes])
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else
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  AC_MSG_RESULT([no])
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fi
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AC_MSG_CHECKING([whether to disable memory pools])
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if test "x$disable_mem_pools" = "xno"; then
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  AC_MSG_RESULT([no])
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else
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  AC_DEFINE(DISABLE_MEM_POOLS, [1], [Whether to disable memory pools])
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  AC_SUBST(DISABLE_MEM_POOLS)
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  AC_MSG_RESULT([yes])
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fi

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if test "$glib_native_win32" = "yes"; then
  if test x$enable_static = xyes -o x$enable_static = x; then
    AC_MSG_WARN([Disabling static library build, must build as DLL on Windows.])
    enable_static=no
  fi
  if test x$enable_shared = xno; then
    AC_MSG_WARN([Enabling shared library build, must build as DLL on Windows.])
  fi
  enable_shared=yes
fi

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dnl Checks for programs.
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AC_PROG_CC
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dnl Check for a working C++ compiler, but do not bail out, if none is found.
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AC_CHECK_PROGS(CXX, [$CCC c++ g++ gcc CC cxx cc++ cl], [gcc])
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AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE(,[class a { int b; } c;], ,CXX=)
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AM_CONDITIONAL(HAVE_CXX, [test "$CXX" != ""])
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AC_LANG_RESTORE
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AM_PROG_CC_STDC
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AM_PROG_CC_C_O
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AC_PROG_INSTALL

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AC_SYS_LARGEFILE

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#
# Find pkg-config
#
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AC_PATH_PROG(PKG_CONFIG, [pkg-config], [no])
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if test x$PKG_CONFIG = xno ; then
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  AC_MSG_ERROR([*** pkg-config not found. See http://www.freedesktop.org/software/pkgconfig/])
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fi

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if $PKG_CONFIG --atleast-pkgconfig-version 0.16 ; then
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  :
else
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  AC_MSG_ERROR([*** pkg-config too old; version 0.16 or better required.])
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fi

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if test "x$enable_debug" = "xyes"; then
  if test x$cflags_set != xset ; then
      case " $CFLAGS " in
      *[[\ \	]]-g[[\ \	]]*) ;;
      *) CFLAGS="$CFLAGS -g" ;;
      esac
  fi
	
  GLIB_DEBUG_FLAGS="-DG_ENABLE_DEBUG"
else
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  GLIB_DEBUG_FLAGS="-DG_DISABLE_CAST_CHECKS"

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  if test "x$enable_debug" = "xno"; then
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    GLIB_DEBUG_FLAGS="$GLIB_DEBUG_FLAGS -DG_DISABLE_ASSERT -DG_DISABLE_CHECKS"
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  fi
fi

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if test "x$enable_visibility" = "xno"; then
  GLIB_DEBUG_FLAGS="$GLIB_DEBUG_FLAGS -DDISABLE_VISIBILITY"
fi

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# Ensure MSVC-compatible struct packing convention is used when
# compiling for Win32 with gcc.
# What flag to depends on gcc version: gcc3 uses "-mms-bitfields", while
# gcc2 uses "-fnative-struct".
if test x"$glib_native_win32" = xyes; then
  if test x"$GCC" = xyes; then
    msnative_struct=''
    AC_MSG_CHECKING([how to get MSVC-compatible struct packing])
    if test -z "$ac_cv_prog_CC"; then
      our_gcc="$CC"
    else
      our_gcc="$ac_cv_prog_CC"
    fi
    case `$our_gcc --version | sed -e 's,\..*,.,' -e q` in
      2.)
	if $our_gcc -v --help 2>/dev/null | grep fnative-struct >/dev/null; then
	  msnative_struct='-fnative-struct'
	fi
	;;
      *)
	if $our_gcc -v --help 2>/dev/null | grep ms-bitfields >/dev/null; then
	  msnative_struct='-mms-bitfields'
	fi
	;;
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    esac
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    if test x"$msnative_struct" = x ; then
      AC_MSG_RESULT([no way])
      AC_MSG_WARN([produced libraries might be incompatible with MSVC-compiled code])
    else
      CFLAGS="$CFLAGS $msnative_struct"
      AC_MSG_RESULT([${msnative_struct}])
    fi
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  fi
fi

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AC_EXEEXT

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# define a MAINT-like variable REBUILD which is set if Perl
# and awk are found, so autogenerated sources can be rebuilt
AC_PROG_AWK
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AC_CHECK_PROGS(PERL, [perl5 perl])
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# We would like indent, but don't require it.
AC_CHECK_PROG(INDENT, indent, indent)
REBUILD=\#
if test "x$enable_rebuilds" = "xyes" && \
     test -n "$PERL" && \
     $PERL -e 'exit !($] >= 5.002)' > /dev/null 2>&1 && \
     test -n "$AWK" ; then
  REBUILD=
fi
AC_SUBST(REBUILD)

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# Need full path to Perl for glib-mkenums
#
if test "x$PERL" != x ; then
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  AC_PATH_PROG(PERL_PATH, [$PERL])
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fi
if test "x$PERL_PATH" = x ; then
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  PERL_PATH="/usr/bin/env perl"
fi
AC_SUBST(PERL_PATH)
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# Need suitable python path for greport
AM_PATH_PYTHON(2.4,,PYTHON="/usr/bin/env python2.4")


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dnl ***********************
dnl *** Tests for iconv ***
dnl ***********************
dnl
dnl We do this before the gettext checks, to avoid distortion

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dnl On Windows we use a native implementation
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if test x"$glib_native_win32" = xyes; then
  with_libiconv=native
else
  AC_ARG_WITH(libiconv,
	      [AC_HELP_STRING([--with-libiconv=@<:@no/gnu/native@:>@],
			      [use the libiconv library])],,
	      [with_libiconv=maybe])

  found_iconv=no
  case $with_libiconv in
    maybe)
      # Check in the C library first
      AC_CHECK_FUNC(iconv_open, [with_libiconv=no; found_iconv=yes])
      # Check if we have GNU libiconv
      if test $found_iconv = "no"; then
	AC_CHECK_LIB(iconv, libiconv_open, [with_libiconv=gnu; found_iconv=yes])
      fi
      # Check if we have a iconv in -liconv, possibly from vendor
      if test $found_iconv = "no"; then
	AC_CHECK_LIB(iconv, iconv_open, [with_libiconv=native; found_iconv=yes])
      fi
      ;;
    no)
      AC_CHECK_FUNC(iconv_open, [with_libiconv=no; found_iconv=yes])
      ;;
    gnu|yes)
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      AC_CHECK_LIB(iconv, libiconv_open, [with_libiconv=gnu; found_iconv=yes])
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      ;;
    native)
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      AC_CHECK_LIB(iconv, iconv_open, [with_libiconv=native; found_iconv=yes])
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      ;;
  esac
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  if test "x$found_iconv" = "xno" ; then
     AC_MSG_ERROR([*** No iconv() implementation found in C library or libiconv])
  fi
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fi

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jm_GLIBC21
AC_ARG_ENABLE(iconv-cache, 
              [AC_HELP_STRING([--enable-iconv-cache=@<:@yes/no/auto@:>@],
                              [cache iconv descriptors [default=auto]])],,
              [enable_iconv_cache=auto])

AC_MSG_CHECKING([Whether to cache iconv descriptors])
case $enable_iconv_cache in
  auto)
    if test $ac_cv_gnu_library_2_1 = yes; then
      enable_iconv_cache=no
    else 
      enable_iconv_cache=yes
    fi
  ;;
  yes|no) 
  ;;
  *) AC_MSG_ERROR([Value given to --enable-iconv-cache must be one of yes, no or auto])
  ;;
esac

if test $enable_iconv_cache = yes; then
   AC_DEFINE(NEED_ICONV_CACHE,1,[Do we cache iconv descriptors])
fi

AC_MSG_RESULT($enable_iconv_cache)


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dnl
dnl gettext support
dnl

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ALL_LINGUAS="am ar as az be be@latin bg bn bn_IN bs ca cs cy da de dz el en_CA en_GB eo es et eu fa fi fr ga gl gu he hi hr hu hy id is it ja ka kn ko ku lt lv mg mk ml mn mr ms nb ne nl nn oc or pa pl pt pt_BR ro ru rw si sk sl sq sr sr@Latn sr@ije sv ta te th tl tr tt uk vi wa xh yi zh_CN zh_HK zh_TW"
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GLIB_GNU_GETTEXT
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if test "$gt_cv_have_gettext" != "yes" ; then
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  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

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LIBS="$INTLLIBS $LIBS"
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GETTEXT_PACKAGE=glib20
AC_SUBST(GETTEXT_PACKAGE)
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AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, ["$GETTEXT_PACKAGE"], 
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  [Define the gettext package to be used])
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GLIB_DEFINE_LOCALEDIR(GLIB_LOCALE_DIR)
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dnl
dnl Now we are done with gettext checks, figure out ICONV_LIBS
dnl

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if test x"$glib_native_win32" != xyes; then
  if test x$with_libiconv != xno ; then
    case " $INTLLIBS " in
    *[[\ \	]]-liconv[[\ \	]]*) ;;
    *) ICONV_LIBS="-liconv" ;;
    esac
  fi
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fi
AC_SUBST(ICONV_LIBS)

case $with_libiconv in
  gnu)
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    AC_DEFINE(USE_LIBICONV_GNU, 1, [Using GNU libiconv])
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    ;;
  native)
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    AC_DEFINE(USE_LIBICONV_NATIVE, 1, [Using a native implementation of iconv in a separate library])
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    ;;
esac

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dnl Initialize libtool
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AM_DISABLE_STATIC
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AC_LIBTOOL_WIN32_DLL
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AM_PROG_LIBTOOL

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

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dnl
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dnl DU4 native cc currently needs -std1 for ANSI mode (instead of K&R)
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dnl
if test $cross_compiling != yes ; then
    AC_MSG_CHECKING([for extra flags to get ANSI library prototypes])
    glib_save_LIBS=$LIBS
    LIBS="$LIBS -lm"
    AC_TRY_RUN([#include <math.h>
		 int main (void) { return (log(1) != log(1.)); }],
	 AC_MSG_RESULT(none needed),
	 glib_save_CFLAGS=$CFLAGS
	 CFLAGS="$CFLAGS -std1"
	 AC_TRY_RUN([#include <math.h>
		     int main (void) { return (log(1) != log(1.)); }],
	     AC_MSG_RESULT(-std1),
	     AC_MSG_RESULT()
	     CFLAGS=$glib_save_CFLAGS
	     AC_MSG_WARN(
		    [No ANSI prototypes found in library. (-std1 didn't work.)])
	 )
    )
    LIBS=$glib_save_LIBS
fi
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dnl NeXTStep cc seems to need this
AC_MSG_CHECKING([for extra flags for POSIX compliance])
AC_TRY_COMPILE([#include <dirent.h>], [DIR *dir;],
  AC_MSG_RESULT(none needed),
  glib_save_CFLAGS=$CFLAGS
  CFLAGS="$CFLAGS -posix"
  AC_TRY_COMPILE([#include <dirent.h>], [DIR *dir;],
    AC_MSG_RESULT(-posix),
    AC_MSG_RESULT()
    CFLAGS=$glib_save_CFLAGS
    AC_MSG_WARN([Could not determine POSIX flag. (-posix didn't work.)])))

# Checks for header files.
AC_HEADER_STDC

# Checks for library functions.
AC_FUNC_VPRINTF
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AC_FUNC_MMAP
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AC_FUNC_ALLOCA
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AC_CHECK_FUNCS(posix_memalign)
AC_CHECK_FUNCS(memalign)
AC_CHECK_FUNCS(valloc)
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AC_CHECK_FUNCS(atexit on_exit)

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AC_CHECK_FUNCS(timegm)

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AC_CHECK_SIZEOF(char)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(void *)
AC_CHECK_SIZEOF(long long)
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AC_CHECK_SIZEOF(__int64)
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if test x$ac_cv_sizeof_long = x8 || test x$ac_cv_sizeof_long_long = x8 || test x$ac_cv_sizeof___int64 = x8 ; then
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  :
else
  AC_MSG_ERROR([
*** GLib requires a 64 bit type. You might want to consider
*** using the GNU C compiler.
])
fi

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if test x$glib_native_win32 != xyes && test x$ac_cv_sizeof_long_long = x8; then
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	# long long is a 64 bit integer.
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	AC_MSG_CHECKING(for format to printf and scanf a guint64)
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	AC_CACHE_VAL(glib_cv_long_long_format,[
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		for format in ll q I64; do
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		  AC_TRY_RUN([#include <stdio.h>  
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			int main()
			{
			  long long b, a = -0x3AFAFAFAFAFAFAFALL;
			  char buffer[1000];
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			  sprintf (buffer, "%${format}u", a);
  			  sscanf (buffer, "%${format}u", &b);
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			  exit (b!=a);
			}
			],
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			[glib_cv_long_long_format=${format}
			break],
			[],[:])
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		done])
	if test -n "$glib_cv_long_long_format"; then
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	  AC_MSG_RESULT(%${glib_cv_long_long_format}u)
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	  AC_DEFINE(HAVE_LONG_LONG_FORMAT,1,[define if system printf can print long long])
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	  if test x"$glib_cv_long_long_format" = xI64; then
	    AC_DEFINE(HAVE_INT64_AND_I64,1,[define to support printing 64-bit integers with format I64])
	  fi
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        else
	  AC_MSG_RESULT(none)
        fi
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elif test x$ac_cv_sizeof___int64 = x8; then
	# __int64 is a 64 bit integer.
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	AC_MSG_CHECKING(for format to printf and scanf a guint64)
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	# We know this is MSVCRT.DLL, and what the formats are
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	glib_cv_long_long_format=I64
	AC_MSG_RESULT(%${glib_cv_long_long_format}u)
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        AC_DEFINE(HAVE_LONG_LONG_FORMAT,1,[define if system printf can print long long])
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	AC_DEFINE(HAVE_INT64_AND_I64,1,[define to support printing 64-bit integers with format I64])
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fi

dnl long doubles were not used, and a portability problem
dnl AC_C_LONG_DOUBLE
AC_C_CONST

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dnl ok, here we try to check whether the systems prototypes for
dnl malloc and friends actually match the prototypes provided
dnl by gmem.h (keep in sync). i currently only know how to check
dnl this reliably with gcc (-Werror), improvements for other
dnl compilers are apprechiated.
SANE_MALLOC_PROTOS=no
AC_MSG_CHECKING([if malloc() and friends prototypes are gmem.h compatible])
glib_save_CFLAGS=$CFLAGS
if test "x$GCC" = "xyes"; then
  CFLAGS="$CFLAGS -Werror"
  AC_TRY_COMPILE([#include <stdlib.h>], [
    void* (*my_calloc_p)  (size_t, size_t) = calloc;
    void* (*my_malloc_p)  (size_t)         = malloc;
    void  (*my_free_p)    (void*)          = free;
    void* (*my_realloc_p) (void*, size_t)  = realloc;
    my_calloc_p = 0;
    my_malloc_p = 0;
    my_free_p = 0;
    my_realloc_p = 0;
  ],
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    AC_DEFINE(SANE_MALLOC_PROTOS, 1, 
      [Define if you have correct malloc prototypes])
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    SANE_MALLOC_PROTOS=yes)
fi
AC_MSG_RESULT($SANE_MALLOC_PROTOS)
CFLAGS=$glib_save_CFLAGS

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dnl
dnl check in which direction the stack grows
dnl
AC_CACHE_CHECK([for growing stack pointer],glib_cv_stack_grows,[
        AC_TRY_RUN([
	volatile int *a = 0, *b = 0;
	void foo (void);
	int main () { volatile int y = 7; a = &y; foo (); return b > a; }
	void foo (void) { volatile int x = 5; b = &x; }
       	],
	glib_cv_stack_grows=no
        ,
	glib_cv_stack_grows=yes
        ,)
])
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dnl AC_C_INLINE is useless to us since it bails out too early, we need to
dnl truely know which ones of `inline', `__inline' and `__inline__' are
dnl actually supported.
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AC_CACHE_CHECK([for __inline],glib_cv_has__inline,[
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        AC_COMPILE_IFELSE([
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	__inline int foo () { return 0; }
	int main () { return foo (); }
       	],
	glib_cv_has__inline=yes
        ,
	glib_cv_has__inline=no
        ,)
])
case x$glib_cv_has__inline in
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xyes) AC_DEFINE(G_HAVE___INLINE,1,[Have __inline keyword])
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esac
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AC_CACHE_CHECK([for __inline__],glib_cv_has__inline__,[
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        AC_COMPILE_IFELSE([
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	__inline__ int foo () { return 0; }
	int main () { return foo (); }
       	],
	glib_cv_has__inline__=yes
        ,
	glib_cv_has__inline__=no
        ,)
])
case x$glib_cv_has__inline__ in
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xyes) AC_DEFINE(G_HAVE___INLINE__,1,[Have __inline__ keyword])
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esac
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AC_CACHE_CHECK([for inline], glib_cv_hasinline,[
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        AC_COMPILE_IFELSE([
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	#undef inline
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	inline int foo () { return 0; }
	int main () { return foo (); }
       	],
	glib_cv_hasinline=yes
        ,
	glib_cv_hasinline=no
        ,)
])
case x$glib_cv_hasinline in
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xyes) AC_DEFINE(G_HAVE_INLINE,1,[Have inline keyword])
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esac

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# if we can use inline functions in headers
AC_MSG_CHECKING(if inline functions in headers work)
AC_LINK_IFELSE([
#if defined (G_HAVE_INLINE) && defined (__GNUC__) && defined (__STRICT_ANSI__)
#  undef inline
#  define inline __inline__
#elif !defined (G_HAVE_INLINE)
#  undef inline
#  if defined (G_HAVE___INLINE__)
#    define inline __inline__
#  elif defined (G_HAVE___INLINE)
#    define inline __inline
#  endif
#endif

int glib_test_func2 (int);

static inline int
glib_test_func1 (void) {
  return glib_test_func2 (1);
}

int
main (void) {
  int i = 1;
}],[g_can_inline=yes],[g_can_inline=no])
AC_MSG_RESULT($g_can_inline)

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dnl *** check for working do while(0) macros ***
AC_CACHE_CHECK([for working do while(0) macros], g_support_dowhile_macros, [
	AC_TRY_COMPILE([],[
	#define STMT_START do
	#define STMT_END while(0)
	#define STMT_TEST STMT_START { i = 0; } STMT_END
	int main(void) { int i = 1; STMT_TEST; return i; }],
	[g_support_dowhile_macros=yes],
	[g_support_dowhile_macros=no],
	[g_support_dowhile_macros=yes])
])
if test x$g_support_dowhile_macros = xyes; then
  AC_DEFINE(HAVE_DOWHILE_MACROS, 1, [define for working do while(0) macros])
fi

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# check for flavours of varargs macros
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AC_MSG_CHECKING(for ISO C99 varargs macros in C)
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AC_TRY_COMPILE([],[
int a(int p1, int p2, int p3);
#define call_a(...) a(1,__VA_ARGS__)
call_a(2,3);
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],g_have_iso_c_varargs=yes,g_have_iso_c_varargs=no)
AC_MSG_RESULT($g_have_iso_c_varargs)

AC_MSG_CHECKING(for ISO C99 varargs macros in C++)
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if test "$CXX" = ""; then
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dnl No C++ compiler
  g_have_iso_cxx_varargs=no
else
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([],[
int a(int p1, int p2, int p3);
#define call_a(...) a(1,__VA_ARGS__)
call_a(2,3);
],g_have_iso_cxx_varargs=yes,g_have_iso_cxx_varargs=no)
  AC_LANG_C
fi
AC_MSG_RESULT($g_have_iso_cxx_varargs)
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AC_MSG_CHECKING(for GNUC varargs macros)
AC_TRY_COMPILE([],[
int a(int p1, int p2, int p3);
#define call_a(params...) a(1,params)
call_a(2,3);
],g_have_gnuc_varargs=yes,g_have_gnuc_varargs=no)
AC_MSG_RESULT($g_have_gnuc_varargs)

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# check for GNUC visibility support
AC_MSG_CHECKING(for GNUC visibility attribute)
GLIB_CHECK_COMPILE_WARNINGS([
void
__attribute__ ((visibility ("hidden")))
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     f_hidden (void)
{
}
void
__attribute__ ((visibility ("internal")))
     f_internal (void)
{
}
void
__attribute__ ((visibility ("protected")))
     f_protected (void)
{
}
void
__attribute__ ((visibility ("default")))
     f_default (void)
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{
}
int main (int argc, char **argv)
{
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	f_hidden();
	f_internal();
	f_protected();
	f_default();
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	return 0;
}
],g_have_gnuc_visibility=yes,g_have_gnuc_visibility=no)
AC_MSG_RESULT($g_have_gnuc_visibility)
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AM_CONDITIONAL(HAVE_GNUC_VISIBILITY, [test x$g_have_gnuc_visibility = xyes])
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AC_MSG_CHECKING([whether using Sun Studio C compiler])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#if defined(__SUNPRO_C) || (__SUNPRO_C >= 0x550)
#else
# include "error: this is not Sun Studio."
#endif
]], [[]])], [ g_have_sunstudio_visibility=yes ], [ g_have_sunstudio_visibility=no ])
AC_MSG_RESULT($g_have_sunstudio_visibility)
AM_CONDITIONAL(HAVE_SUNSTUDIO_VISIBILITY, [test x$g_have_sunstudio_visibility = xyes])

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# check for bytesex stuff
AC_C_BIGENDIAN

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# check for header files
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AC_CHECK_HEADERS([dirent.h float.h limits.h pwd.h grp.h sys/param.h sys/poll.h sys/resource.h])
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AC_CHECK_HEADERS([sys/time.h sys/times.h sys/wait.h unistd.h values.h])
AC_CHECK_HEADERS([sys/select.h sys/types.h stdint.h sched.h malloc.h])
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AC_CHECK_HEADERS([sys/vfs.h sys/mount.h sys/vmount.h sys/statfs.h sys/statvfs.h])
AC_CHECK_HEADERS([mntent.h sys/mnttab.h sys/vfstab.h sys/mntctl.h sys/sysctl.h fstab.h])

# check for structure fields
AC_CHECK_MEMBERS([struct stat.st_mtimensec, struct stat.st_mtim.tv_nsec, struct stat.st_atimensec, struct stat.st_atim.tv_nsec, struct stat.st_ctimensec, struct stat.st_ctim.tv_nsec])
AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_blocks])
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# Checks for libcharset
jm_LANGINFO_CODESET
jm_GLIBC21
AC_CHECK_HEADERS([stddef.h stdlib.h string.h])
AC_CHECK_FUNCS(setlocale)

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# check additional type sizes
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AC_CHECK_SIZEOF(size_t)
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dnl Try to figure out whether gsize, gssize should be long or int
AC_MSG_CHECKING([for the appropriate definition for size_t])

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case $ac_cv_sizeof_size_t in
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  $ac_cv_sizeof_short) 
      glib_size_type=short
      ;;
  $ac_cv_sizeof_int) 
      glib_size_type=int
      ;;
  $ac_cv_sizeof_long) 
      glib_size_type=long
      ;;
  *)  AC_MSG_ERROR([No type matching size_t in size])
      ;;
esac

dnl If int/long are the same size, we see which one produces
dnl warnings when used in the location as size_t. (This matters
dnl on AIX with xlc)
dnl
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if test $ac_cv_sizeof_size_t = $ac_cv_sizeof_int &&
   test $ac_cv_sizeof_size_t = $ac_cv_sizeof_long ; then
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  GLIB_CHECK_COMPILE_WARNINGS([
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#if defined(_AIX) && !defined(__GNUC__)
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#pragma options langlvl=stdc89
#endif
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#include <stddef.h> 
int main ()
{
  size_t s = 1;
  unsigned int *size_int = &s;
  return (int)*size_int;
}
    ],glib_size_type=int,
      [GLIB_CHECK_COMPILE_WARNINGS([
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#if defined(_AIX) && !defined(__GNUC__)
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#pragma options langlvl=stdc89
#endif
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#include <stddef.h> 
int main ()
{
   size_t s = 1;
   unsigned long *size_long = &s;
   return (int)*size_long;
}
        ],glib_size_type=long)])
fi

AC_MSG_RESULT(unsigned $glib_size_type)

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# Check for some functions
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AC_CHECK_FUNCS(lstat strerror strsignal memmove vsnprintf stpcpy strcasecmp strncasecmp poll getcwd vasprintf setenv unsetenv getc_unlocked readlink symlink fdwalk)
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AC_CHECK_FUNCS(chown lchown fchmod fchown link statvfs statfs utimes getgrgid getpwuid)
AC_CHECK_FUNCS(setmntent endmntent hasmntopt getmntinfo)
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# Check for high-resolution sleep functions
AC_CHECK_FUNCS(nanosleep nsleep)

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AC_CHECK_HEADERS(crt_externs.h)
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AC_CHECK_FUNCS(_NSGetEnviron)
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AC_FUNC_VSNPRINTF_C99
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AC_FUNC_PRINTF_UNIX98

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dnl
dnl if statfs() takes 2 arguments (Posix) or 4 (Solaris)
dnl
if test "$ac_cv_func_statfs" = yes ; then
  AC_MSG_CHECKING([number of arguments to statfs()])
  AC_TRY_COMPILE([#include <unistd.h>
  #ifdef HAVE_SYS_PARAM_H
  #include <sys/param.h>
  #endif
  #ifdef HAVE_SYS_VFS_H
  #include <sys/vfs.h>
  #endif
  #ifdef HAVE_SYS_MOUNT_H
  #include <sys/mount.h>
  #endif
  #ifdef HAVE_SYS_STATFS_H
  #include <sys/statfs.h>
  #endif], [struct statfs st;
  statfs(NULL, &st);],[
    AC_MSG_RESULT([2])
    AC_DEFINE(STATFS_ARGS, 2, [Number of arguments to statfs()])],[
    AC_TRY_COMPILE([#include <unistd.h>
  #ifdef HAVE_SYS_PARAM_H
  #include <sys/param.h>
  #endif
  #ifdef HAVE_SYS_VFS_H
  #include <sys/vfs.h>
  #endif
  #ifdef HAVE_SYS_MOUNT_H
  #include <sys/mount.h>
  #endif
  #ifdef HAVE_SYS_STATFS_H
  #include <sys/statfs.h>
  #endif], [struct statfs st;
  statfs(NULL, &st, sizeof (st), 0);],[
      AC_MSG_RESULT([4])
      AC_DEFINE(STATFS_ARGS, 4, [Number of arguments to statfs()])],[
      AC_MSG_RESULT(unknown)
      AC_MSG_ERROR([unable to determine number of arguments to statfs()])])])
fi

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#
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# Check whether to use an included printf
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#

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AC_ARG_ENABLE(included-printf,
              [AC_HELP_STRING([--enable-included-printf],
                              [use included printf [default=auto]])],
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              enable_included_printf="$enableval")
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need_included_printf=no
if test "x$enable_included_printf" = "xyes" ; then
  need_included_printf=yes
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fi
if test "$ac_cv_func_vsnprintf_c99" != "yes" ; then
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  need_included_printf=yes
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fi
if test "$ac_cv_func_printf_unix98" != "yes" ; then
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  need_included_printf=yes
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fi
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if test "x$ac_cv_sizeof_long_long" = "x8" &&
   test -z "$glib_cv_long_long_format" ; then
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  need_included_printf=yes
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fi

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if test "x$enable_included_printf" = "xno" && 
   test "x$need_included_printf" = "xyes" ; then
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  AC_MSG_ERROR([
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*** Your C library's printf doesn't appear to have the features that
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*** GLib needs, but you specified --enable-included-printf=no.])
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fi

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enable_included_printf=$need_included_printf
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AM_CONDITIONAL(HAVE_GOOD_PRINTF, test "$enable_included_printf" != "yes")
if test "$enable_included_printf" != "yes" ; then 
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  AC_DEFINE(HAVE_GOOD_PRINTF,1,[define to use system printf])
985
else
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  if test -z "$glib_cv_long_long_format" ; then
    glib_cv_long_long_format="ll"
  fi
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  AC_DEFINE(HAVE_VASPRINTF,1)
fi
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# Checks needed for gnulib vasnprintf
bh_C_SIGNED
jm_AC_TYPE_LONG_LONG
gt_TYPE_LONGDOUBLE
gt_TYPE_WCHAR_T
gt_TYPE_WINT_T
AC_TYPE_SIZE_T
AC_CHECK_TYPES(ptrdiff_t)
jm_AC_TYPE_INTMAX_T
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AC_CHECK_FUNCS([snprintf wcslen])
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AC_FUNC_SNPRINTF_C99
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# Check if bcopy can be used for overlapping copies, if memmove isn't found.
# The check is borrowed from the PERL Configure script.
if test "$ac_cv_func_memmove" != "yes"; then
  AC_CACHE_CHECK(whether bcopy can handle overlapping copies,
    glib_cv_working_bcopy,[AC_TRY_RUN([
      int main() {
        char buf[128], abc[128], *b;
        int len, off, align;
        bcopy("abcdefghijklmnopqrstuvwxyz0123456789", abc, 36);
        for (align = 7; align >= 0; align--) {
          for (len = 36; len; len--) {
            b = buf+align; bcopy(abc, b, len);
            for (off = 1; off <= len; off++) {
              bcopy(b, b+off, len); bcopy(b+off, b, len);
                if (bcmp(b, abc, len)) return(1);
            }
          }
        }
        return(0);
      }],glib_cv_working_bcopy=yes,glib_cv_working_bcopy=no)])
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  GLIB_ASSERT_SET(glib_cv_working_bcopy)
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  if test "$glib_cv_working_bcopy" = "yes"; then
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    AC_DEFINE(HAVE_WORKING_BCOPY,1,[Have a working bcopy])
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  fi
fi

# Check for sys_errlist
AC_MSG_CHECKING(for sys_errlist)
AC_TRY_LINK(, [
extern char *sys_errlist[];
extern int sys_nerr;
sys_errlist[sys_nerr-1][0] = 0;
], glib_ok=yes, glib_ok=no)
AC_MSG_RESULT($glib_ok)
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if test "$glib_ok" = "no"; then
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    AC_DEFINE(NO_SYS_ERRLIST,1,[global 'sys_errlist' not found])
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fi

# Check for sys_siglist
AC_MSG_CHECKING(for sys_siglist)
AC_TRY_LINK(, [
extern char *sys_siglist[];
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exit (sys_siglist[0]);
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], glib_ok=yes, glib_ok=no)
AC_MSG_RESULT($glib_ok)
1050
if test "$glib_ok" = "no"; then
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    AC_DEFINE(NO_SYS_SIGLIST,1,[global 'sys_siglist' not found])
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fi

# Check for sys_siglist decl (see Tue Jan 19 00:44:24 1999 in changelog)
AC_MSG_CHECKING(for sys_siglist declaration)
AC_TRY_COMPILE([#include <signal.h>], [
strlen (sys_siglist[0]);
], glib_ok=yes, glib_ok=no)
AC_MSG_RESULT($glib_ok)
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if test "$glib_ok" = "no"; then
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    AC_DEFINE(NO_SYS_SIGLIST_DECL,1,[global 'sys_siglist' not declared])
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fi

# Check if <sys/select.h> needs to be included for fd_set
AC_MSG_CHECKING([for fd_set])
AC_TRY_COMPILE([#include <sys/types.h>],
        [fd_set readMask, writeMask;], gtk_ok=yes, gtk_ok=no)
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if test "$gtk_ok" = "yes"; then
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    AC_MSG_RESULT([yes, found in sys/types.h])
else
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    AC_EGREP_HEADER(fd_set, sys/select.h, gtk_ok=yes)
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    if test "$gtk_ok" = "yes"; then
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	# *** FIXME: give it a different name
        AC_DEFINE(HAVE_SYS_SELECT_H,1,[found fd_set in sys/select.h])
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        AC_MSG_RESULT([yes, found in sys/select.h])
    else
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	AC_DEFINE(NO_FD_SET,1,[didn't find fd_set])
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	AC_MSG_RESULT(no)
    fi
fi

dnl *** check for sane realloc() ***
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AC_CACHE_CHECK([whether realloc (NULL,) will work],glib_cv_sane_realloc,[
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        AC_TRY_RUN([#include <stdlib.h>
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        int main() {
          return realloc (0, sizeof (int)) == 0;
        }],
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        [glib_cv_sane_realloc=yes],
        [glib_cv_sane_realloc=no],
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	[glib_cv_sane_realloc=yes])
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])
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if test x$glib_cv_sane_realloc = xyes; then
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  AC_DEFINE(REALLOC_0_WORKS,1,[whether realloc (NULL,) works])
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fi
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dnl Check for nl_langinfo and CODESET
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AC_CACHE_CHECK([for nl_langinfo (CODESET)],glib_cv_langinfo_codeset,[
        AC_TRY_COMPILE([#include <langinfo.h>],
                [char *codeset = nl_langinfo (CODESET);],
                [glib_cv_langinfo_codeset=yes],
                [glib_cv_langinfo_codeset=no])])
if test x$glib_cv_langinfo_codeset = xyes; then
  AC_DEFINE(HAVE_CODESET,1,[Have nl_langinfo (CODESET)])
fi
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dnl ****************************************
dnl *** posix_memalign                   ***
dnl ****************************************
AC_MSG_CHECKING(for a compliant posix_memalign() implementation)
AC_CACHE_VAL(glib_cv_compliant_posix_memalign,[
    glib_cv_compliant_posix_memalign=0
    if test "$ac_cv_func_posix_memalign" = "yes" ; then
	AC_TRY_RUN([
                #define _XOPEN_SOURCE 600
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                #include <stdlib.h> /* posix_memalign() should be defined here */
                /* some systems break if #include <malloc.h> used */
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		static void test_memalign (size_t boundary, size_t size) {
		    void *mem = 0;
		    if (posix_memalign (&mem, boundary, size) != 0 || !mem)
			exit (1);
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                    else
                      free (mem);
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		}
		int main() {
		    test_memalign (  128,   128 - 2 * sizeof (void*));
		    test_memalign (  256,   256 - 2 * sizeof (void*));
		    test_memalign (  512,   512 - 2 * sizeof (void*));
		    test_memalign ( 1024,  1024 - 2 * sizeof (void*));
		    test_memalign ( 2048,  2048 - 2 * sizeof (void*));
		    test_memalign ( 4096,  4096 - 2 * sizeof (void*));
		    test_memalign ( 8192,  8192 - 2 * sizeof (void*));
		    test_memalign (16384, 16384 - 2 * sizeof (void*));
		    test_memalign (32768, 32768 - 2 * sizeof (void*));
		    exit (0); /* success */
		}
		],
	    [glib_cv_compliant_posix_memalign=1], [], [:])
      :
    fi
    ])
if test "$glib_cv_compliant_posix_memalign" = "1"; then
    AC_MSG_RESULT(yes)
    AC_DEFINE(POSIX_MEMALIGN_WITH_COMPLIANT_ALLOCS, 1, [define if posix_memalign() can allocate any size])
else
    AC_MSG_RESULT(no)
fi


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dnl ****************************************
dnl *** strlcpy/strlcat                  ***
dnl ****************************************
# Check for strlcpy
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AC_CACHE_CHECK([for OpenBSD strlcpy/strlcat],glib_cv_have_strlcpy,[
AC_TRY_RUN([#include <stdlib.h>
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#include <string.h>
int main() {
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  char p[10];
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  (void) strlcpy (p, "hi", 10);
  if (strlcat (p, "bye", 0) != 3) 
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    return 1;
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  return 0;
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}], glib_cv_have_strlcpy=yes, 
    glib_cv_have_strlcpy=no,
    glib_cv_have_strlcpy=no)])
if test "$glib_cv_have_strlcpy" = "yes"; then
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    AC_DEFINE(HAVE_STRLCPY,1,[Have functions strlcpy and strlcat])
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fi
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dnl **********************
dnl *** va_copy checks ***
dnl **********************
dnl we currently check for all three va_copy possibilities, so we get
dnl all results in config.log for bug reports.
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AC_CACHE_CHECK([for an implementation of va_copy()],glib_cv_va_copy,[
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	AC_LINK_IFELSE([#include <stdarg.h>
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#include <stdlib.h>
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	void f (int i, ...) {
	va_list args1, args2;
	va_start (args1, i);
	va_copy (args2, args1);
	if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
	  exit (1);
	va_end (args1); va_end (args2);
	}
	int main() {
	  f (0, 42);
	  return 0;
	}],
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	[glib_cv_va_copy=yes],
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	[glib_cv_va_copy=no])
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])
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AC_CACHE_CHECK([for an implementation of __va_copy()],glib_cv___va_copy,[
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	AC_LINK_IFELSE([#include <stdarg.h>
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#include <stdlib.h>
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	void f (int i, ...) {
	va_list args1, args2;
	va_start (args1, i);
	__va_copy (args2, args1);
	if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
	  exit (1);
	va_end (args1); va_end (args2);
	}
	int main() {
	  f (0, 42);
	  return 0;
	}],
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	[glib_cv___va_copy=yes],
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	[glib_cv___va_copy=no])
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])
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if test "x$glib_cv_va_copy" = "xyes"; then
  g_va_copy_func=va_copy
else if test "x$glib_cv___va_copy" = "xyes"; then
  g_va_copy_func=__va_copy
fi
fi

if test -n "$g_va_copy_func"; then
  AC_DEFINE_UNQUOTED(G_VA_COPY,$g_va_copy_func,[A 'va_copy' style function])
fi

AC_CACHE_CHECK([whether va_lists can be copied by value],glib_cv_va_val_copy,[
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	AC_TRY_RUN([#include <stdarg.h>
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#include <stdlib.h> 
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	void f (int i, ...) {
	va_list args1, args2;
	va_start (args1, i);
	args2 = args1;
	if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
	  exit (1);
	va_end (args1); va_end (args2);
	}
	int main() {
	  f (0, 42);
	  return 0;
	}],
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	[glib_cv_va_val_copy=yes],
	[glib_cv_va_val_copy=no],
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	[glib_cv_va_val_copy=yes])
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])
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if test "x$glib_cv_va_val_copy" = "xno"; then
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  AC_DEFINE(G_VA_COPY_AS_ARRAY,1, ['va_lists' cannot be copies as values])
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fi

dnl ***********************
dnl *** g_module checks ***
dnl ***********************
G_MODULE_LIBS=
G_MODULE_LIBS_EXTRA=
G_MODULE_PLUGIN_LIBS=
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if test x"$glib_native_win32" = xyes; then
  dnl No use for this on Win32
  G_MODULE_LDFLAGS=
else
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  export SED
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  G_MODULE_LDFLAGS=`(./libtool --config; echo eval echo \\$export_dynamic_flag_spec) | sh`
fi
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dnl G_MODULE_IMPL= don't reset, so cmd-line can override
G_MODULE_NEED_USCORE=0
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G_MODULE_BROKEN_RTLD_GLOBAL=0
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G_MODULE_HAVE_DLERROR=0
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dnl *** force native WIN32 shared lib loader 
if test -z "$G_MODULE_IMPL"; then
  case "$host" in
  *-*-mingw*|*-*-cygwin*) G_MODULE_IMPL=G_MODULE_IMPL_WIN32 ;;
  esac
fi
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dnl *** force native AIX library loader
dnl *** dlopen() filepath must be of the form /path/libname.a(libname.so)
if test -z "$G_MODULE_IMPL"; then
  case "$host" in
  *-*-aix*) G_MODULE_IMPL=G_MODULE_IMPL_AR ;;
  esac
fi
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dnl *** dlopen() and dlsym() in system libraries
if test -z "$G_MODULE_IMPL"; then
	AC_CHECK_FUNC(dlopen,
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		      [AC_CHECK_FUNC(dlsym,
			             [G_MODULE_IMPL=G_MODULE_IMPL_DL],[])],
		      [])
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fi
dnl *** load_image (BeOS)
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if test -z "$G_MODULE_IMPL" && test "x$glib_native_beos" = "xyes"; then
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  AC_CHECK_LIB(root, load_image,
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      [G_MODULE_LIBS="-lbe -lroot -lglib-2.0 "
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      G_MODULE_LIBS_EXTRA="-L\$(top_builddir_full)/.libs"
      G_MODULE_PLUGIN_LIBS="-L\$(top_builddir_full)/gmodule/.libs -lgmodule"
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      G_MODULE_IMPL=G_MODULE_IMPL_BEOS],
      [])
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fi   
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dnl *** NSLinkModule (dyld) in system libraries (Darwin)
if test -z "$G_MODULE_IMPL"; then
 	AC_CHECK_FUNC(NSLinkModule,
		      [G_MODULE_IMPL=G_MODULE_IMPL_DYLD
		       G_MODULE_NEED_USCORE=1],
		      [])
fi
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dnl *** dlopen() and dlsym() in libdl
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if test -z "$G_MODULE_IMPL"; then
	AC_CHECK_LIB(dl, dlopen,
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		     [AC_CHECK_LIB(dl, dlsym,
			           [G_MODULE_LIBS=-ldl
		                   G_MODULE_IMPL=G_MODULE_IMPL_DL],[])],
		     [])
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fi
dnl *** shl_load() in libdld (HP-UX)
if test -z "$G_MODULE_IMPL"; then
	AC_CHECK_LIB(dld, shl_load,
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		[G_MODULE_LIBS=-ldld
		G_MODULE_IMPL=G_MODULE_IMPL_DLD],
		[])
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fi
dnl *** additional checks for G_MODULE_IMPL_DL
if test "$G_MODULE_IMPL" = "G_MODULE_IMPL_DL"; then
	LIBS_orig="$LIBS"
	LDFLAGS_orig="$LDFLAGS"
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	LIBS="$G_MODULE_LIBS $LIBS"
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	LDFLAGS="$LDFLAGS $G_MODULE_LDFLAGS"
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dnl *** check for OSF1/5.0 RTLD_GLOBAL brokenness
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	echo "void glib_plugin_test(void) { }" > plugin.c
	${SHELL} ./libtool --mode=compile ${CC} -shared \
		-export-dynamic -o plugin.o plugin.c 2>&1 >/dev/null
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	AC_CACHE_CHECK([for RTLD_GLOBAL brokenness],
		glib_cv_rtldglobal_broken,[
		AC_TRY_RUN([
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#include <dlfcn.h>
#ifndef RTLD_GLOBAL
#  define RTLD_GLOBAL 0
#endif
#ifndef RTLD_LAZY
#  define RTLD_LAZY 0
#endif
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int glib_plugin_test;
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int main () {
    void *handle, *global, *local;
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    global = &glib_plugin_test;
    handle = dlopen ("./.libs/plugin.o", RTLD_GLOBAL | RTLD_LAZY);
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    if (!handle) return 0;
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    local = dlsym (handle, "glib_plugin_test");
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    return global == local;
}                       ],
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			[glib_cv_rtldglobal_broken=no],
			[glib_cv_rtldglobal_broken=yes],
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			[glib_cv_rtldglobal_broken=no])
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		rm -f plugin.c plugin.o plugin.lo .libs/plugin.o
		rmdir .libs 2>/dev/null
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	])
	if test "x$glib_cv_rtldglobal_broken" = "xyes"; then
  		G_MODULE_BROKEN_RTLD_GLOBAL=1
	else
  		G_MODULE_BROKEN_RTLD_GLOBAL=0
	fi
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dnl *** check whether we need preceeding underscores
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	AC_CACHE_CHECK([for preceeding underscore in symbols],
		glib_cv_uscore,[
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		AC_TRY_RUN([#include <dlfcn.h>
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                int glib_underscore_test (void) { return 42; }
		int main() {
		  void *f1 = (void*)0, *f2 = (void*)0, *handle;
		  handle = dlopen ((void*)0, 0);
		  if (handle) {
		    f1 = dlsym (handle, "glib_underscore_test");
		    f2 = dlsym (handle, "_glib_underscore_test");
		  } return (!f2 || f1);
		}],
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			[glib_cv_uscore=yes],
			[glib_cv_uscore=no],
			[])
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		rm -f plugin.c plugin.$ac_objext plugin.lo
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	])
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        GLIB_ASSERT_SET(glib_cv_uscore)
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	if test "x$glib_cv_uscore" = "xyes"; then
  		G_MODULE_NEED_USCORE=1
	else
  		G_MODULE_NEED_USCORE=0
	fi

	LDFLAGS="$LDFLAGS_orig"
dnl *** check for having dlerror()
	AC_CHECK_FUNC(dlerror,
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		[G_MODULE_HAVE_DLERROR=1],
		[G_MODULE_HAVE_DLERROR=0])
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	LIBS="$LIBS_orig"
fi
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dnl *** done, have we got an implementation?
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if test -z "$G_MODULE_IMPL"; then
	G_MODULE_IMPL=0
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        G_MODULE_SUPPORTED=false
else
        G_MODULE_SUPPORTED=true
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fi
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AC_MSG_CHECKING(for the suffix of shared libraries)
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export SED
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shrext_cmds=`./libtool --config | grep '^shrext_cmds='`
eval $shrext_cmds
module=yes eval std_shrext=$shrext_cmds
# chop the initial dot
glib_gmodule_suffix=`echo $std_shrext | sed 's/^\.//'`
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AC_MSG_RESULT(.$glib_gmodule_suffix)
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# any reason it may fail?
if test "x$glib_gmodule_suffix" = x; then
	AC_MSG_ERROR(Cannot determine shared library suffix from libtool)
fi
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AC_SUBST(G_MODULE_SUPPORTED)
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AC_SUBST(G_MODULE_IMPL)
AC_SUBST(G_MODULE_LIBS)
AC_SUBST(G_MODULE_LIBS_EXTRA)
AC_SUBST(G_MODULE_PLUGIN_LIBS)
AC_SUBST(G_MODULE_LDFLAGS)
AC_SUBST(G_MODULE_HAVE_DLERROR)
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AC_SUBST(G_MODULE_BROKEN_RTLD_GLOBAL)
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AC_SUBST(G_MODULE_NEED_USCORE)
AC_SUBST(GLIB_DEBUG_FLAGS)

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dnl **********************
dnl *** g_spawn checks ***
dnl **********************

AC_MSG_CHECKING(for gspawn implementation)
case "$host" in
  *-*-mingw*)
    GSPAWN=gspawn-win32.lo
    ;;
  *)
    GSPAWN=gspawn.lo
    ;;    
esac
AC_MSG_RESULT($GSPAWN)
AC_SUBST(GSPAWN)

dnl *************************
dnl *** GIOChannel checks ***
dnl *************************

AC_MSG_CHECKING(for GIOChannel implementation)
case "$host" in
  *-*-mingw*)
    GIO=giowin32.lo
    ;;
  *)
    GIO=giounix.lo
    ;;    
esac
AC_MSG_RESULT($GIO)
AC_SUBST(GIO)

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dnl *********************************
dnl *** Directory for GIO modules ***
dnl *********************************

AC_ARG_WITH(gio-module-dir,
           [AC_HELP_STRING([--with-gio-module-dir=PATH],
                           [Load gio modules from this directory [LIBDIR/gio/modules]])],
           [],
	   [with_gio_module_dir='${libdir}/gio/modules'])
GIO_MODULE_DIR=$with_gio_module_dir
AC_SUBST(GIO_MODULE_DIR)
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dnl **********************************
dnl *** Check for libselinux (GIO) ***
dnl **********************************
AC_ARG_ENABLE(selinux, [  --disable-selinux       build without selinux support])
msg_selinux=no
SELINUX_LIBS=
if test "x$enable_selinux" != "xno"; then

 AC_CHECK_LIB(selinux, is_selinux_enabled,
   [AC_CHECK_HEADERS(selinux/selinux.h,
     [AC_SEARCH_LIBS(lgetfilecon_raw, selinux, 
       [AC_DEFINE(HAVE_SELINUX, 1, [Define to 1 if libselinux is available])
        SELINUX_LIBS="-lselinux"
        msg_selinux=yes])
     ])
   ])
fi
AC_SUBST(SELINUX_LIBS)

dnl *****************************
dnl ** Check for inotify (GIO) **