diff options
| author | Timothy Arceri <[email protected]> | 2014-12-07 00:09:40 +1100 |
|---|---|---|
| committer | Timothy Arceri <[email protected]> | 2014-12-10 07:35:38 +1100 |
| commit | f1b5f2b157a092e93590bd43544fbf2671edab36 (patch) | |
| tree | f815b493a34d334f2e0bd303be92c278aaa33839 /configure.ac | |
| parent | 65ef78e8611556780fce0bee1feba805347ec627 (diff) | |
mesa: use build flag to ensure stack is realigned on x86
Nowadays GCC assumes stack pointer is 16-byte aligned even on 32-bits, but that is an assumption OpenGL drivers (or any dynamic library for that matter) can't afford to make as there are many closed- and open- source application binaries out there that only assume 4-byte stack alignment.
V4: fix comment and indentation
V3: move all sse4.1 build flag config to the same location
and add comment as to why we need to do the realign
V2: use $target_cpu rather than $host_cpu
and setup build flags in config rather than makefile
https://bugs.freedesktop.org/show_bug.cgi?id=86788
Signed-off-by: Timothy Arceri <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
CC: "10.4" <[email protected]>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index b0df1bba899..4bdf75d60d6 100644 --- a/configure.ac +++ b/configure.ac @@ -253,8 +253,16 @@ AC_SUBST([VISIBILITY_CXXFLAGS]) dnl dnl Optional flags, check for compiler support dnl +SSE41_CFLAGS="-msse4.1" +dnl Code compiled by GCC with -msse* assumes a 16 byte aligned +dnl stack, but on x86-32 such alignment is not guaranteed. +case "$target_cpu" in +i?86) + SSE41_CFLAGS="$SSE41_CFLAGS -mstackrealign" + ;; +esac save_CFLAGS="$CFLAGS" -CFLAGS="-msse4.1 $CFLAGS" +CFLAGS="$SSE41_CFLAGS $CFLAGS" AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ #include <smmintrin.h> int main () { @@ -267,6 +275,7 @@ if test "x$SSE41_SUPPORTED" = x1; then DEFINES="$DEFINES -DUSE_SSE41" fi AM_CONDITIONAL([SSE41_SUPPORTED], [test x$SSE41_SUPPORTED = x1]) +AC_SUBST([SSE41_CFLAGS], $SSE41_CFLAGS) dnl Can't have static and shared libraries, default to static if user dnl explicitly requested. If both disabled, set to static since shared |