1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/build/autoconf/llvm-pr8927.m4 Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,52 @@
1.4 +dnl This Source Code Form is subject to the terms of the Mozilla Public
1.5 +dnl License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 +dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
1.7 +
1.8 +dnl Check if the compiler suffers from http://llvm.org/pr8927. If so, ask the
1.9 +dnl user to upgrade.
1.10 +
1.11 +AC_DEFUN([MOZ_LLVM_PR8927],
1.12 +[
1.13 +AC_MSG_CHECKING(for llvm pr8927)
1.14 +ac_have_llvm_pr8927="no"
1.15 +AC_LANG_SAVE
1.16 +AC_LANG_C
1.17 +
1.18 +_SAVE_CFLAGS=$CFLAGS
1.19 +CFLAGS="-O2"
1.20 +AC_TRY_RUN([
1.21 +struct foobar {
1.22 + int x;
1.23 +};
1.24 +static const struct foobar* foo() {
1.25 + static const struct foobar d = { 0 };
1.26 + return &d;
1.27 +}
1.28 +static const struct foobar* bar() {
1.29 + static const struct foobar d = { 0 };
1.30 + return &d;
1.31 +}
1.32 +__attribute__((noinline)) int zed(const struct foobar *a,
1.33 + const struct foobar *b) {
1.34 + return a == b;
1.35 +}
1.36 +int main() {
1.37 + return zed(foo(), bar());
1.38 +}
1.39 +], true,
1.40 + ac_have_llvm_pr8927="yes",
1.41 + true)
1.42 +CFLAGS="$_SAVE_CFLAGS"
1.43 +
1.44 +AC_LANG_RESTORE
1.45 +
1.46 +if test "$ac_have_llvm_pr8927" = "yes"; then
1.47 + AC_MSG_RESULT(yes)
1.48 + echo This compiler would miscompile firefox, please upgrade.
1.49 + echo see http://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions/Mac_OS_X_Prerequisites
1.50 + echo for more information.
1.51 + exit 1
1.52 +else
1.53 + AC_MSG_RESULT(no)
1.54 +fi
1.55 +])
