From dd7bfa5b86e350c8b789380949cde3bb013b33b0 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Tue, 21 Jul 2015 22:04:58 +0200
Subject: Add flags to improve SSE detection

---
 configure.ac | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 821ba1f..5c3235c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,21 +164,24 @@ AC_LANG_POP([C++])
 
 # Check for SSE
 AC_MSG_CHECKING(for SSE in current arch/CFLAGS)
-AC_LINK_IFELSE([
-AC_LANG_PROGRAM([[
+
+save_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -msse"
+AC_MSG_CHECKING([whether we need to add -msse])
+AC_COMPILE_IFELSE(  [AC_LANG_PROGRAM([[
 #include <xmmintrin.h>
 __m128 testfunc(float *a, float *b) {
   return _mm_add_ps(_mm_loadu_ps(a), _mm_loadu_ps(b));
 }
 ]])],
-[
-has_sse=yes
-],
-[
-has_sse=no
-]
+[has_sse=yes],
+[has_sse=no]
 )
 AC_MSG_RESULT($has_sse)
+if test x"$has_sse" = xno; then
+    CXXFLAGS="$save_CXXFLAGS"
+fi
+
 
 AM_CONDITIONAL([HAVE_SSE], [test "x$has_sse" = "xyes"])
 
-- 
cgit v1.2.3