Add ACTION-IF-USE and ACTION-IF-NOTUSE parameters to GST_CHECK_FEATURE.

Original commit message from CVS:
Add ACTION-IF-USE and ACTION-IF-NOTUSE parameters to GST_CHECK_FEATURE.
Convert glib2 check to use GST_CHECK_FEATURE.

acinclude.m4

@@ -297,7 +297,8 @@ dnl Perform a check for a feature for GStreamer
 dnl Richard Boulton <richard-alsa@tartarus.org>
 dnl Last modification: 25/06/2001
 dnl GST_CHECK_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION,
-dnl                   DEPENDENT-PLUGINS, TEST-FOR-FEATURE)
+dnl                   DEPENDENT-PLUGINS, TEST-FOR-FEATURE,
+dnl                   DISABLE-BY-DEFAULT, ACTION-IF-USE, ACTION-IF-NOTUSE)
 dnl
 dnl This macro adds a command line argument to enable the user to enable
 dnl or disable a feature, and if the feature is enabled, performs a supplied
@@ -306,6 +307,14 @@ dnl
 dnl The test should define HAVE_<FEATURE-NAME> to "yes" or "no" depending
 dnl on whether the feature is available.
 dnl
+dnl The macro will set USE_<<FEATURE-NAME> to "yes" or "no" depending on
+dnl whether the feature is to be used.
+dnl
+dnl The macro will call AM_CONDTIONAL(USE_<<FEATURE-NAME>, ...) to allow
+dnl the feature to control what is built in Makefile.ams.  If you want
+dnl additional actions resulting from the test, you can add them with the
+dnl ACTION-IF-USE and ACTION-IF-NOTUSE parameters.
+dnl 
 dnl FEATURE-NAME        is the name of the feature, and should be in
 dnl                     purely upper case characters.
 dnl FEATURE-DESCRIPTION is used to describe the feature in help text for
@@ -316,12 +325,16 @@ dnl                     or "no" depending on whether the feature is
 dnl                     available.
 dnl DISABLE-BY-DEFAULT  if "disabled", the feature is disabled by default,
 dnl                     if any other value, the feature is enabled by default.
+dnl ACTION-IF-USE       any extra actions to perform if the feature is to be
+dnl                     used.
+dnl ACTION-IF-NOTUSE    any extra actions to perform if the feature is not to
+dnl                     be used.
 dnl
 AC_DEFUN(GST_CHECK_FEATURE,
 [dnl
 builtin(define, [gst_endisable], ifelse($5, [disabled], [enable], [disable]))dnl
 AC_ARG_ENABLE(translit([$1], A-Z, a-z),
-  [  ]builtin(format, --%-26s gst_endisable %s: %s, gst_endisable-translit([$1], A-Z, a-z), [$2], [$3]),
+  [  ]builtin(format, --%-26s gst_endisable %s, gst_endisable-translit([$1], A-Z, a-z), [$2]ifelse([$3],,,: [$3])),
   [ case "${enableval}" in
       yes) USE_[$1]=yes ;;
       no) USE_[$1]=no ;;
@@ -350,10 +363,13 @@ if test x$USE_[$1] = xyes; then
   fi
 fi
 dnl *** Warn if it's disabled or not found
-if test x$USE_[$1] = xno; then
+if test x$USE_[$1] = xyes; then
-  AC_MSG_WARN(
+  ifelse([$6], , :, [$6])
+else
+  ifelse([$3], , :, [AC_MSG_WARN(
 ***** NOTE: These plugins won't be built: [$3]
-)
+)])
+  ifelse([$7], , :, [$7])
 fi
 dnl *** Define the conditional as appropriate
 AM_CONDITIONAL(USE_[$1], test x$USE_[$1] = xyes)

configure.base

@@ -168,63 +168,38 @@ AC_MSG_RESULT(no)
 dnl Check for essential libraries first:
 dnl ====================================
 
-
+dnl Check for glib2
-AC_ARG_ENABLE(glib2,
+GST_CHECK_FEATURE(GLIB2, [use of glib-2.0 and GObject], , [
-[  --enable-glib2            enable the use of glib-2.0 and GObject if available],
-[ case "${enableval}" in
-	yes) USE_GLIB2=yes ;;
-	no) USE_GLIB2=no ;;
-	*) AC_MSG_ERROR(bad value ${enableval} for --enable-glib2) ;;
-	esac],
-[:])
-HAVE_OBJECT_MODEL=no
-
-if test x$USE_GLIB2 = xyes; then
-  AC_MSG_CHECKING(glib-2.0)
   PKG_CHECK_MODULES(GLIB2, glib-2.0 gobject-2.0 gthread-2.0 gmodule-2.0,
-    HAVE_GLIB2=yes,HAVE_GLIB2=yes)
+    HAVE_GLIB2=yes,HAVE_GLIB2=no)
+  AC_SUBST(GLIB2_LIBS)
+  AC_SUBST(GLIB2_CFLAGS)
+], disabled, [
+  CORE_LIBS="$CORE_LIBS $GLIB2_LIBS"
+  CORE_CFLAGS="$CORE_CFLAGS $GLIB2_CFLAGS"
 
-  if test x$HAVE_GLIB2 = xyes; then
+  AC_DEFINE(USE_GLIB2)
-    CORE_LIBS="$GLIB2_LIBS"
+  GST_DEFINE_CFLAGS="$GST_DEFINE_CFLAGS -DUSE_GLIB2"
-    CORE_CFLAGS="$GLIB2_CFLAGS"
+])
-    AC_SUBST(GLIB2_LIBS)
-    AC_SUBST(GLIB2_CFLAGS)
-
-    AC_DEFINE(USE_GLIB2)
-    GST_DEFINE_CFLAGS="$GST_DEFINE_CFLAGS -DUSE_GLIB2"
-
-    HAVE_OBJECT_MODEL=yes
-  else
-    USE_GLIB2=no
-
-    HAVE_OBJECT_MODEL=no
-  fi
-fi
-
-AM_CONDITIONAL(USE_GLIB2, test "x$USE_GLIB2" = "xyes")
 AC_SUBST(USE_GLIB2)
+
+dnl FIXME: check for gtk2 and gnome2 - these conditionals are currently
+dnl always false.
 AM_CONDITIONAL(USE_GTK2, test "x$USE_GTK2" = "xyes")
 AC_SUBST(USE_GTK2)
 AM_CONDITIONAL(USE_GNOME2, test "x$USE_GNOME2" = "xyes")
 AC_SUBST(USE_GNOME2)
 
-if test x$HAVE_OBJECT_MODEL = xno; then
+if test x$USE_GLIB2 = xno; then
-  dnl Check for glib
+  dnl Check for glib and gtk
   AM_PATH_GLIB(1.2.0,,
               AC_MSG_ERROR(Cannot find glib: Is glib-config in path?),
               glib gmodule gthread)
-  dnl Put the glib flags into $LIBS and $CFLAGS since we always use them
-  CORE_LIBS="$GLIB_LIBS"
-  CORE_CFLAGS="$GLIB_CFLAGS"
-
-  dnl Check for gtk
   AM_PATH_GTK(1.2.0,,
               AC_MSG_ERROR(Cannot find gtk: Is gtk-config in path?))
-  dnl Put the gtk flags into $LIBS and $CFLAGS since we always use them
-  CORE_LIBS="$CORE_LIBS $GTK_LIBS"
-  CORE_CFLAGS="$CORE_CFLAGS $GTK_CFLAGS"
 
-  HAVE_OBJECT_MODEL=yes
+  CORE_LIBS="$CORE_LIBS $GLIB_LIBS $GTK_LIBS"
+  CORE_CFLAGS="$CORE_CFLAGS $GLIB_CFLAGS $GTK_CFLAGS"
 fi