diff options
Diffstat (limited to 'sys-devel/gcc/files/4.1.0/gcc-4.1.0-fast-math-i386-Os-workaround.patch')
| -rw-r--r-- | sys-devel/gcc/files/4.1.0/gcc-4.1.0-fast-math-i386-Os-workaround.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/sys-devel/gcc/files/4.1.0/gcc-4.1.0-fast-math-i386-Os-workaround.patch b/sys-devel/gcc/files/4.1.0/gcc-4.1.0-fast-math-i386-Os-workaround.patch new file mode 100644 index 000000000000..6090d66d132d --- /dev/null +++ b/sys-devel/gcc/files/4.1.0/gcc-4.1.0-fast-math-i386-Os-workaround.patch @@ -0,0 +1,64 @@ +workaround for lame stack packing on i386 ... + + - build gcc with -Os (crtfastmath.o to be specific) + - crtfastmath.o is installed into gcc libdir + - run gcc with -ffast-math and get crtfastmath.o linked in + - resulting compiled app segfaults due to init code in + crtfastmath.o that has mis-aligned structure on stack + +http://bugs.gentoo.org/147020 +http://gcc.gnu.org/PR28621 + +this is supposed to be fixed in current 4.1 branch, but i'm unable to get +the fix to work so until i can figure out what i'm doing wrong, we'll use +this workaround for now. + +--- gcc-4.1.1/gcc/config/i386/crtfastmath.c ++++ gcc-4.1.1/gcc/config/i386/crtfastmath.c +@@ -37,6 +37,23 @@ + #define FXSAVE (1 << 24) + #define SSE (1 << 25) + ++struct ++{ ++ unsigned short int cwd; ++ unsigned short int swd; ++ unsigned short int twd; ++ unsigned short int fop; ++ long int fip; ++ long int fcs; ++ long int foo; ++ long int fos; ++ long int mxcsr; ++ long int mxcsr_mask; ++ long int st_space[32]; ++ long int xmm_space[32]; ++ long int padding[56]; ++} __attribute__ ((aligned (16))) fxsave; ++ + static void __attribute__((constructor)) + set_fast_math (void) + { +@@ -75,22 +92,6 @@ + if (edx & FXSAVE) + { + /* Check if DAZ is available. */ +- struct +- { +- unsigned short int cwd; +- unsigned short int swd; +- unsigned short int twd; +- unsigned short int fop; +- long int fip; +- long int fcs; +- long int foo; +- long int fos; +- long int mxcsr; +- long int mxcsr_mask; +- long int st_space[32]; +- long int xmm_space[32]; +- long int padding[56]; +- } __attribute__ ((aligned (16))) fxsave; + + __builtin_memset (&fxsave, 0, sizeof (fxsave)); + |