Modify check for -msse4.2 flag to support clang

diff --git a/build_detect_platform b/build_detect_platform
index 29d93ba94b2bc8cb8600e2c0a4168a7834d02c4d..e962b2b3074fae57539f6640474f15356d189797 100755 (executable)
--- a/build_detect_platform
+++ b/build_detect_platform
@@ -224,7 +224,9 @@ EOF
     rm -f $CXXOUTPUT 2>/dev/null
 
     # Test if gcc SSE 4.2 is supported
-    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -msse4.2 2>/dev/null  <<EOF
+    # clang will emit only "argument unused during compilation: '-msse4.2'" warning
+    # make it error with -Werror
+    $CXX $CXXFLAGS -Werror -x c++ - -o $CXXOUTPUT -msse4.2 2>/dev/null  <<EOF
       int main() {}
 EOF
     if [ "$?" = 0 ]; then