michael@0: dnl This Source Code Form is subject to the terms of the Mozilla Public
michael@0: dnl License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0: dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
michael@0: 
michael@0: dnl Check if the compiler suffers from http://llvm.org/pr8927. If so, ask the
michael@0: dnl user to upgrade.
michael@0: 
michael@0: AC_DEFUN([MOZ_LLVM_PR8927],
michael@0: [
michael@0: AC_MSG_CHECKING(for llvm pr8927)
michael@0: ac_have_llvm_pr8927="no"
michael@0: AC_LANG_SAVE
michael@0: AC_LANG_C
michael@0: 
michael@0: _SAVE_CFLAGS=$CFLAGS
michael@0: CFLAGS="-O2"
michael@0: AC_TRY_RUN([
michael@0: struct foobar {
michael@0:   int x;
michael@0: };
michael@0: static const struct foobar* foo() {
michael@0:   static const struct foobar d = { 0 };
michael@0:   return &d;
michael@0: }
michael@0: static const struct foobar* bar() {
michael@0:   static const struct foobar d = { 0 };
michael@0:   return &d;
michael@0: }
michael@0: __attribute__((noinline)) int zed(const struct foobar *a,
michael@0:                                   const struct foobar *b) {
michael@0:   return a == b;
michael@0: }
michael@0: int main() {
michael@0:   return zed(foo(), bar());
michael@0: }
michael@0: ], true,
michael@0:    ac_have_llvm_pr8927="yes",
michael@0:    true)
michael@0: CFLAGS="$_SAVE_CFLAGS"
michael@0: 
michael@0: AC_LANG_RESTORE
michael@0: 
michael@0: if test "$ac_have_llvm_pr8927" = "yes"; then
michael@0:    AC_MSG_RESULT(yes)
michael@0:    echo This compiler would miscompile firefox, please upgrade.
michael@0:    echo see http://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions/Mac_OS_X_Prerequisites
michael@0:    echo for more information.
michael@0:    exit 1
michael@0: else
michael@0:    AC_MSG_RESULT(no)
michael@0: fi
michael@0: ])