The Tor Browser: build/autoconf/llvm-pr8927.m4@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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/.

     5 dnl Check if the compiler suffers from http://llvm.org/pr8927. If so, ask the

     6 dnl user to upgrade.

     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

    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"

    41 AC_LANG_RESTORE

    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 ])

The Tor Browser / file revision