From 4ab3651591d231c69f0f16dbeae26e2cc7ee819f Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Thu, 2 Jul 2020 17:00:15 +0200
Subject: [PATCH] Option -mavx2 requires at least gcc 4.7

---
 Makefile.x86_64 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Makefile.x86_64 b/Makefile.x86_64
index f2de51ef4..2676bd258 100644
--- a/Makefile.x86_64
+++ b/Makefile.x86_64
@@ -31,14 +31,24 @@ ifeq ($(CORE), HASWELL)
 ifndef DYNAMIC_ARCH
 ifndef NO_AVX2
 ifeq ($(C_COMPILER), GCC)
+# AVX2 support was added in 4.7.0
+GCCVERSIONGTEQ4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 4)
+GCCMINORVERSIONGTEQ7 := $(shell expr `$(CC) -dumpversion | cut -f2 -d.` \>= 7)
+ifeq ($(GCCVERSIONGTEQ4)$(GCCMINORVERSIONGTEQ7), 11)
 CCOMMON_OPT += -mavx2
 endif
+endif
 ifeq ($(F_COMPILER), GFORTRAN)
+# AVX2 support was added in 4.7.0
+GCCVERSIONGTEQ4 := $(shell expr `$(FC) -dumpversion | cut -f1 -d.` \>= 4)
+GCCMINORVERSIONGTEQ7 := $(shell expr `$(FC) -dumpversion | cut -f2 -d.` \>= 7)
+ifeq ($(GCCVERSIONGTEQ4)$(GCCMINORVERSIONGTEQ7), 11)
 FCOMMON_OPT += -mavx2
 endif
 endif
 endif
 endif
+endif