The Tor Browser / file comparison
comparison: build/autoconf/gcc-pr49911.m4
build/autoconf/gcc-pr49911.m4
- branch
- TOR_BUG_9701
- changeset 3
- 141e0f1194b1
equal
deleted
inserted
replaced
| -1:000000000000 | 0:baed49c891e5 |
|---|---|
| 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 is gcc and has PR49911. If so | |
| 6 dnl disable vrp. | |
| 7 | |
| 8 AC_DEFUN([MOZ_GCC_PR49911], | |
| 9 [ | |
| 10 if test "$GNU_CC"; then | |
| 11 | |
| 12 AC_MSG_CHECKING(for gcc PR49911) | |
| 13 ac_have_gcc_pr49911="no" | |
| 14 AC_LANG_SAVE | |
| 15 AC_LANG_CPLUSPLUS | |
| 16 | |
| 17 _SAVE_CXXFLAGS=$CXXFLAGS | |
| 18 CXXFLAGS="-O2" | |
| 19 AC_TRY_RUN([ | |
| 20 extern "C" void abort(void); | |
| 21 typedef enum { | |
| 22 eax, ecx, edx, ebx, esp, ebp, | |
| 23 esi, edi } | |
| 24 RegisterID; | |
| 25 union StateRemat { | |
| 26 RegisterID reg_; | |
| 27 int offset_; | |
| 28 }; | |
| 29 static StateRemat FromRegister(RegisterID reg) { | |
| 30 StateRemat sr; | |
| 31 sr.reg_ = reg; | |
| 32 return sr; | |
| 33 } | |
| 34 static StateRemat FromAddress3(int address) { | |
| 35 StateRemat sr; | |
| 36 sr.offset_ = address; | |
| 37 if (address < 46 && address >= 0) { | |
| 38 abort(); | |
| 39 } | |
| 40 return sr; | |
| 41 } | |
| 42 struct FrameState { | |
| 43 StateRemat dataRematInfo2(bool y, int z) { | |
| 44 if (y) return FromRegister(RegisterID(1)); | |
| 45 return FromAddress3(z); | |
| 46 } | |
| 47 }; | |
| 48 FrameState frame; | |
| 49 StateRemat x; | |
| 50 __attribute__((noinline)) void jsop_setelem(bool y, int z) { | |
| 51 x = frame.dataRematInfo2(y, z); | |
| 52 } | |
| 53 int main(void) { | |
| 54 jsop_setelem(0, 47); | |
| 55 } | |
| 56 ], true, | |
| 57 ac_have_gcc_pr49911="yes", | |
| 58 true) | |
| 59 CXXFLAGS="$_SAVE_CXXFLAGS" | |
| 60 | |
| 61 AC_LANG_RESTORE | |
| 62 | |
| 63 if test "$ac_have_gcc_pr49911" = "yes"; then | |
| 64 AC_MSG_RESULT(yes) | |
| 65 CFLAGS="$CFLAGS -fno-tree-vrp" | |
| 66 CXXFLAGS="$CXXFLAGS -fno-tree-vrp" | |
| 67 else | |
| 68 AC_MSG_RESULT(no) | |
| 69 fi | |
| 70 fi | |
| 71 ]) |
