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