The Tor Browser: build/autoconf/gcc-pr49911.m4@141e0f1194b1

     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 is gcc and has PR49911. If so

     6 dnl disable vrp.

     8 AC_DEFUN([MOZ_GCC_PR49911],

9 [

    10 if test "$GNU_CC"; then

    12 AC_MSG_CHECKING(for gcc PR49911)

    13 ac_have_gcc_pr49911="no"

    14 AC_LANG_SAVE

    15 AC_LANG_CPLUSPLUS

    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"

    61 AC_LANG_RESTORE

    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 ])

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