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