diff options
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 |