зеркало из https://github.com/mozilla/gecko-dev.git
68 строки
1.3 KiB
Plaintext
68 строки
1.3 KiB
Plaintext
dnl Check if the compiler is gcc and has PR49911. If so
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dnl disable vrp.
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AC_DEFUN([MOZ_GCC_PR49911],
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[
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if test "$GNU_CC"; then
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AC_MSG_CHECKING(for gcc PR49911)
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ac_have_gcc_pr49911="no"
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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_SAVE_CXXFLAGS=$CXXFLAGS
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CXXFLAGS="-O2"
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AC_TRY_RUN([
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extern "C" void abort(void);
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typedef enum {
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eax, ecx, edx, ebx, esp, ebp,
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esi, edi }
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RegisterID;
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union StateRemat {
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RegisterID reg_;
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int offset_;
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};
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static StateRemat FromRegister(RegisterID reg) {
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StateRemat sr;
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sr.reg_ = reg;
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return sr;
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}
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static StateRemat FromAddress3(int address) {
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StateRemat sr;
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sr.offset_ = address;
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if (address < 46 && address >= 0) {
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abort();
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}
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return sr;
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}
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struct FrameState {
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StateRemat dataRematInfo2(bool y, int z) {
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if (y) return FromRegister(RegisterID(1));
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return FromAddress3(z);
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}
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};
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FrameState frame;
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StateRemat x;
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__attribute__((noinline)) void jsop_setelem(bool y, int z) {
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x = frame.dataRematInfo2(y, z);
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}
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int main(void) {
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jsop_setelem(0, 47);
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}
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], true,
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ac_have_gcc_pr49911="yes",
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true)
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CXXFLAGS="$_SAVE_CXXFLAGS"
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AC_LANG_RESTORE
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if test "$ac_have_gcc_pr49911" = "yes"; then
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AC_MSG_RESULT(yes)
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CFLAGS="$CFLAGS -fno-tree-vrp"
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CXXFLAGS="$CXXFLAGS -fno-tree-vrp"
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else
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AC_MSG_RESULT(no)
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fi
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fi
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])
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