m4: fix AC_LANG_SOURCE warnings in AG_GST_CHECK_GST_DEBUG_DISABLED

diff --git a/m4/gst-feature.m4 b/m4/gst-feature.m4
index c072c79..cff7f30 100644 (file)
--- a/m4/gst-feature.m4
+++ b/m4/gst-feature.m4
@@ -232,10 +232,11 @@ AC_DEFUN([AG_GST_CHECK_GST_DEBUG_DISABLED],
   save_CFLAGS="$CFLAGS"
   CFLAGS="$GST_CFLAGS $CFLAGS"
   AC_COMPILE_IFELSE([
+    AC_LANG_SOURCE([[
       #include <gst/gstconfig.h>
       #ifdef GST_DISABLE_GST_DEBUG
       #error "debugging disabled, make compiler fail"
-      #endif], [ debug_system_enabled=yes], [debug_system_enabled=no])
+      #endif]])], [ debug_system_enabled=yes], [debug_system_enabled=no])
   CFLAGS="$save_CFLAGS"
   AC_LANG_POP([C])