From 1a91a89ae942e1351c0c6ba624dd27c6dd7230f9 Mon Sep 17 00:00:00 2001
From: Michael Henning <drawoc@darkrefraction.com>
Date: Sun, 3 Jan 2016 17:02:38 -0500
Subject: [PATCH] configure.ac: Fix the test for compiling half-floating point
 code.

_mm_cvtph_ps is implicitly defined if the compiler does not support
it. So, we need to store its return value in a variable so that
the test fails to type check when the function is implicitly defined
to return an int.
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 28e9af0..e2ab5f7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -390,7 +390,7 @@ if test "x$enable_mmx" = xyes; then
 
         CFLAGS="$CFLAGS $sse_flag $f16c_flag"
 
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <immintrin.h>],[_mm_cvtph_ps ((__m128i)_mm_setzero_ps());])],
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <immintrin.h>],[__m128 val = _mm_cvtph_ps ((__m128i)_mm_setzero_ps());])],
           AC_DEFINE(USE_F16C, 1, [Define to 1 if f16c intrinsics are available.])
           AC_MSG_RESULT(yes)
         ,
-- 
2.30.2