configure.in 93.2 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], [17])
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m4_define([glib_micro_version], [3])
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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_pid_type='void *'
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    # Unfortunately the mingw implementations of C99-style snprintf and vsnprintf
    # don't seem to be quite good enough, at least not in mingw-runtime-3.14.
    # (Sorry, I don't know exactly what is the problem, but it is related to
    # floating point formatting and decimal point vs. comma.)
    # The simple tests in AC_FUNC_VSNPRINTF_C99 and AC_FUNC_SNPRINTF_C99 aren't
    # rigorous enough to notice, though.
    # So preset the autoconf cache variables.
    ac_cv_func_vsnprintf_c99=no
    ac_cv_func_snprintf_c99=no
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    ;;
  *)
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    glib_native_win32=no
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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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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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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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GLIB_EXTRA_CFLAGS="${msnative_struct}"
AC_SUBST(GLIB_EXTRA_CFLAGS)
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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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gl_GLIBC21
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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="`grep -v '^#' "$srcdir/po/LINGUAS" | tr '\n' ' '`"
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AC_SUBST([CONFIG_STATUS_DEPENDENCIES],['$(top_srcdir)/po/LINGUAS'])
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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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CPPFLAGS="$CPPFLAGS -DG_DISABLE_SINGLE_INCLUDES"

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if test "$glib_native_win32" = "yes"; then
  if test x$enable_static = xyes -a x$enable_shared = xyes; then
    AC_MSG_ERROR([Can not build both shared and static at the same time on Windows.])
  fi
  if test x$enable_static = xyes; then
    glib_win32_static_compilation=yes
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    GLIB_WIN32_STATIC_COMPILATION_DEFINE="#define GLIB_STATIC_COMPILATION 1
#define GOBJECT_STATIC_COMPILATION 1"
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    AC_SUBST(GLIB_WIN32_STATIC_COMPILATION_DEFINE)
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  fi
fi
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AM_CONDITIONAL(OS_WIN32_AND_DLL_COMPILATION, [test x$glib_native_win32 = xyes -a x$glib_win32_static_compilation != xyes])
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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 gmtime_r)
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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 ***
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AC_CACHE_CHECK([for working do while(0) macros], g_cv_support_dowhile_macros, [
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	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; }],
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	[g_cv_support_dowhile_macros=yes],
	[g_cv_support_dowhile_macros=no],
	[g_cv_support_dowhile_macros=yes])
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])
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  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_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])
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#include <sys/stat.h>
#include <unistd.h>
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
#endif
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#ifdef HAVE_SYS_MOUNT_H
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#include <sys/mount.h>
#endif])
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# struct statvfs.f_basetype is available on Solaris but not for Linux. 
AC_CHECK_MEMBERS([struct statvfs.f_basetype],,, [#include <sys/statvfs.h>])
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# Checks for libcharset
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AM_LANGINFO_CODESET
gl_GLIBC21
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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)
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AC_CHECK_FUNCS(getmntent_r 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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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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*** GLib needs, but you specified --enable-included-printf=no.])
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fi

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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])
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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($glib_ok)
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if test "$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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1234

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