From: Nick Bowler <nbowler@draconx.ca>
Date: Sun, 19 Jul 2009 21:08:19 +0000 (-0400)
Subject: configure: Implement glib checking macro that actually links a test program.
X-Git-Url: https://git.draconx.ca/gitweb/upkg.git/commitdiff_plain/b0b60305e274967d5b4502c5ce1926a1699e2d3e

configure: Implement glib checking macro that actually links a test program.
---

diff --git a/configure.ac b/configure.ac
index 42594de..16e4c65 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,17 +18,8 @@ AM_CONDITIONAL([BUNDLED_LIBLTDL], [test x$LTDLDEPS != x])
 
 gl_INIT
 
-AC_ARG_WITH([gobject],
-	[AS_HELP_STRING([--with-gobject],
-		[build tools requiring libgobject [default=yes]]
-	)],
-	[],
-	[with_gobject=yes])
-
-have_gobject=no
-if test x$with_gobject = xyes; then
-AM_PATH_GLIB_2_0(, [have_gobject=yes], [have_gobject=no], [gobject])
-fi
+CHECK_GLIB_2([],[gobject], [have_gobject=yes], [have_gobject=no])
+AM_CONDITIONAL([BUILD_UPKG], [test x$have_gobject = xyes])
 
 AC_ARG_WITH([modlib],
 	[AS_HELP_STRING([--with-modlib],
@@ -69,8 +60,6 @@ AC_MSG_RESULT([$use_modlib])
 AM_CONDITIONAL([USE_LIBMODPLUG], [test x$use_modlib = xmodplug])
 AM_CONDITIONAL([USE_DUMMYMOD],   [test x$use_modlib = xnone])
 
-AM_CONDITIONAL([BUILD_UPKG], [test x$have_gobject = xyes])
-
 AC_CONFIG_FILES([
 	Makefile
 	libltdl/Makefile
diff --git a/m4/glib.m4 b/m4/glib.m4
new file mode 100644
index 0000000..261c5fd
--- /dev/null
+++ b/m4/glib.m4
@@ -0,0 +1,107 @@
+dnl _GLIB_TRY_VERSION(min-version)
+AC_DEFUN([_GLIB_TRY_VERSION], [dnl
+sedhead='s/@<:@0-9@:>@@<:@0-9@:>@*/<<<&>>>/'
+sedtail='s/.*<<<\(.*\)>>>.*/\1/;t;s/.*/0/'
+glib_min_major=`printf   '%s' '$1' | sed -e "$sedhead"1 -e "$sedtail"`
+glib_min_minor=`printf   '%s' '$1' | sed -e "$sedhead"2 -e "$sedtail"`
+glib_min_release=`printf '%s' '$1' | sed -e "$sedhead"3 -e "$sedtail"`
+
+AC_CACHE_CHECK([for glib version at least $1],
+	[glib_cv_sufficient_ver],
+	[AC_LINK_IFELSE([AC_LANG_PROGRAM([dnl
+_GLIB_INCLUDES
+#if !GLIB_CHECK_VERSION($glib_min_major,$glib_min_minor,$glib_min_release)
+#  error Insufficient glib version
+#endif
+], [dnl
+_GLIB_MAIN
+])], [glib_cv_sufficient_ver=yes], [glib_cv_sufficient_ver=no])])
+])
+
+dnl _GLIB_MODULE([module-name], [module-list])
+AC_DEFUN([_GLIB_MODULE], [ifelse(m4_bregexp([$2], [\(^\| \)$1\( \|$\)]), [-1],
+[], [dnl
+
+AC_ARG_VAR([LIB]m4_toupper([$1])[_CFLAGS],
+	[C compiler flags for lib$1])
+AC_ARG_VAR([LIB]m4_toupper([$1])[_LIBS],
+	[linker flags for lib$1])
+
+ifelse([$1], [gobject], [dnl
+	m4_append([_GLIB_INCLUDES], [dnl
+#include <glib-object.h>], [
+])
+	m4_append([_GLIB_MAIN], [dnl
+g_type_init();
+{ GObject *obj = g_object_new(G_TYPE_OBJECT, NULL); }], [
+])
+])
+
+if test x"$PKG_CONFIG" != x; then
+	AC_MSG_CHECKING([pkg-config database for $1-2.0])
+	_PKG_CONFIG([lib$1_cflags], [cflags], [$1-2.0])
+	_PKG_CONFIG([lib$1_libs],   [libs],   [$1-2.0])
+	if test x$pkg_failed = xyes; then
+		errors=`$PKG_CONFIG --errors-to-stdout --print-errors lib$1`
+		echo "$errors" >&AS_MESSAGE_LOG_FD
+
+		AC_MSG_RESULT([no])
+	else
+		if test x"$LIB[]m4_toupper([$1])_CFLAGS" = x; then
+			LIB[]m4_toupper([$1])_CFLAGS=$pkg_cv_lib$1_cflags
+		fi
+		if test x"$LIB[]m4_toupper([$1])_LIBS" = x; then
+			LIB[]m4_toupper([$1])_LIBS=$pkg_cv_lib$1_libs
+		fi
+
+		AC_MSG_RESULT([yes])
+	fi
+fi
+
+GLIB_CFLAGS="$GLIB_CFLAGS $LIB[]m4_toupper([$1])_CFLAGS"
+GLIB_LIBS="$GLIB_LIBS $LIB[]m4_toupper([$1])_LIBS"
+
+])])
+
+dnl CHECK_GLIB_2([min-version], [modules], [action-if-ok], [action-if-fail])
+AC_DEFUN([CHECK_GLIB_2],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+
+m4_define([_GLIB_INCLUDES], [#include <glib.h>])
+m4_define([_GLIB_MAIN],     [const char *ver = glib_check_version(2,0,0);])
+
+GLIB_CFLAGS=
+GLIB_LIBS=
+
+_GLIB_MODULE([glib], [glib])
+_GLIB_MODULE([gobject], [$2])
+
+AC_LANG_PUSH([C])
+old_cflags=$CFLAGS
+old_libs=$LIBS
+CFLAGS="$GLIB_CFLAGS $CFLAGS"
+LIBS="$GLIB_LIBS $LIBS"
+
+_GLIB_TRY_VERSION(ifelse([$1], [], [2.0], [$1]))
+
+CFLAGS=$old_cflags
+LIBS=$old_libs
+AC_LANG_POP([C])
+
+if test x"$glib_cv_sufficient_ver" = x"yes"; then
+	AC_SUBST([GLIB_CFLAGS])
+	AC_SUBST([GLIB_LIBS])
+	ifelse([$3], [], [:], [$3])
+else
+	ifelse([$4], [], [AC_MSG_FAILURE([dnl
+glib version >= ifelse([$1], [], [2.0], [$1]) is required.  The latest
+version can be obtained from ftp://ftp.gtk.org/pub/glib.
+
+If libglib is installed but was not found by this configure script,
+consider adjusting LIBGLIB_CFLAGS and/or LIBGLIB_LIBS as necessary.
+
+If pkg-config is installed, it may help to adjust PKG_CONFIG_PATH
+if libglib is installed in a non-standard prefix.
+])], [$4])
+fi
+])