diff -r 000000000000 -r 6474c204b198 build/autoconf/gcc-pr39608.m4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/autoconf/gcc-pr39608.m4	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+dnl This Source Code Form is subject to the terms of the Mozilla Public
+dnl License, v. 2.0. If a copy of the MPL was not distributed with this
+dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+dnl Check if the compiler is gcc and has pr39608. If so
+dnl disable vrp.
+
+AC_DEFUN([MOZ_GCC_PR39608],
+[
+AC_MSG_CHECKING(for gcc pr39608)
+ac_have_gcc_pr39608="yes"
+AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+
+AC_TRY_COMPILE([
+typedef void (*FuncType)();
+template<FuncType Impl>
+void f();
+template<typename T> class C {
+  typedef C<T> ThisC;
+  template<int g()>
+  static void h() {
+    f<ThisC::h<g> >();
+  }
+};
+], true,
+   ac_have_gcc_pr39608="no",
+   true)
+
+AC_LANG_RESTORE
+
+AC_MSG_RESULT($ac_have_gcc_pr39608)
+if test "$ac_have_gcc_pr39608" = "yes"; then
+   echo This compiler would fail to build firefox, please upgrade.
+   exit 1
+fi
+])