build/autoconf/llvm-pr8927.m4@6474c204b198 (annotated)
build/autoconf/llvm-pr8927.m4
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | dnl This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | dnl License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | dnl file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| michael@0 | 4 | |
| michael@0 | 5 | dnl Check if the compiler suffers from http://llvm.org/pr8927. If so, ask the |
| michael@0 | 6 | dnl user to upgrade. |
| michael@0 | 7 | |
| michael@0 | 8 | AC_DEFUN([MOZ_LLVM_PR8927], |
| michael@0 | 9 | [ |
| michael@0 | 10 | AC_MSG_CHECKING(for llvm pr8927) |
| michael@0 | 11 | ac_have_llvm_pr8927="no" |
| michael@0 | 12 | AC_LANG_SAVE |
| michael@0 | 13 | AC_LANG_C |
| michael@0 | 14 | |
| michael@0 | 15 | _SAVE_CFLAGS=$CFLAGS |
| michael@0 | 16 | CFLAGS="-O2" |
| michael@0 | 17 | AC_TRY_RUN([ |
| michael@0 | 18 | struct foobar { |
| michael@0 | 19 | int x; |
| michael@0 | 20 | }; |
| michael@0 | 21 | static const struct foobar* foo() { |
| michael@0 | 22 | static const struct foobar d = { 0 }; |
| michael@0 | 23 | return &d; |
| michael@0 | 24 | } |
| michael@0 | 25 | static const struct foobar* bar() { |
| michael@0 | 26 | static const struct foobar d = { 0 }; |
| michael@0 | 27 | return &d; |
| michael@0 | 28 | } |
| michael@0 | 29 | __attribute__((noinline)) int zed(const struct foobar *a, |
| michael@0 | 30 | const struct foobar *b) { |
| michael@0 | 31 | return a == b; |
| michael@0 | 32 | } |
| michael@0 | 33 | int main() { |
| michael@0 | 34 | return zed(foo(), bar()); |
| michael@0 | 35 | } |
| michael@0 | 36 | ], true, |
| michael@0 | 37 | ac_have_llvm_pr8927="yes", |
| michael@0 | 38 | true) |
| michael@0 | 39 | CFLAGS="$_SAVE_CFLAGS" |
| michael@0 | 40 | |
| michael@0 | 41 | AC_LANG_RESTORE |
| michael@0 | 42 | |
| michael@0 | 43 | if test "$ac_have_llvm_pr8927" = "yes"; then |
| michael@0 | 44 | AC_MSG_RESULT(yes) |
| michael@0 | 45 | echo This compiler would miscompile firefox, please upgrade. |
| michael@0 | 46 | echo see http://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions/Mac_OS_X_Prerequisites |
| michael@0 | 47 | echo for more information. |
| michael@0 | 48 | exit 1 |
| michael@0 | 49 | else |
| michael@0 | 50 | AC_MSG_RESULT(no) |
| michael@0 | 51 | fi |
| michael@0 | 52 | ]) |
