From d8d2d71663c93cf72f698842074f66f7d548c0da Mon Sep 17 00:00:00 2001
From: Wayne Davison <wayne@opencoder.net>
Date: Sun, 21 Jun 2020 22:34:32 -0700
Subject: [PATCH] Get the g++ version to see if it is really clang.

---
 configure.ac | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 135a7e85..df0d8903 100644
--- a/configure.ac
+++ b/configure.ac
@@ -250,7 +250,9 @@ if test x"$SIMD" != x""; then
     SIMD='$(SIMD_'"$SIMD)"
     # We only use c++ for its target attribute dispatching, disable unneeded bulky features
     CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-rtti"
-    case "$CXX" in
+    # Apple often has "g++" as a symlink for clang. Try to find out the truth.
+    CXX_VERSION=`$CXX --version 2>/dev/null | head -n 2`
+    case "$CXX_VERSION" in
     *clang*) CXXFLAGS="$CXXFLAGS -fno-slp-vectorize" ;; # avoid a performance hit
     esac
 else
-- 
2.47.2