--- configure.in.orig	2012-07-14 00:40:08.000000000 +0200
+++ configure.in	2012-08-18 18:16:06.000000000 +0200
@@ -3101,6 +3118,8 @@
 
 AC_SUBST(VISIBILITY_FLAGS)
 
+MOZ_COMPILER_OPTS
+
 dnl Checks for header files.
 dnl ========================================================
 AC_HEADER_DIRENT
@@ -4067,29 +4086,29 @@
 
 AC_CACHE_CHECK(for __attribute__((always_inline)),
                ac_cv_attribute_always_inline,
-               [AC_TRY_COMPILE([],
-                               [inline void f(void) __attribute__((always_inline));],
+               [AC_TRY_COMPILE([inline void f(void) __attribute__((always_inline));],
+                               [],
                                ac_cv_attribute_always_inline=yes,
                                ac_cv_attribute_always_inline=no)])
 
 AC_CACHE_CHECK(for __attribute__((malloc)),
                ac_cv_attribute_malloc,
-               [AC_TRY_COMPILE([],
-                               [void* f(int) __attribute__((malloc));],
+               [AC_TRY_COMPILE([void* f(int) __attribute__((malloc));],
+                               [],
                                ac_cv_attribute_malloc=yes,
                                ac_cv_attribute_malloc=no)])
 
 AC_CACHE_CHECK(for __attribute__((warn_unused_result)),
                ac_cv_attribute_warn_unused,
-               [AC_TRY_COMPILE([],
-                               [int f(void) __attribute__((warn_unused_result));],
+               [AC_TRY_COMPILE([int f(void) __attribute__((warn_unused_result));],
+                               [],
                                ac_cv_attribute_warn_unused=yes,
                                ac_cv_attribute_warn_unused=no)])
 
 AC_CACHE_CHECK(for __attribute__((noreturn)),
                ac_cv_attribute_noreturn,
-               [AC_TRY_COMPILE([],
-                               [void f(void) __attribute__((noreturn));],
+               [AC_TRY_COMPILE([void f(void) __attribute__((noreturn));],
+                               [],
                                ac_cv_attribute_noreturn=yes,
                                ac_cv_attribute_noreturn=no)])