From 2010b61006598869e2452b482d6ff00f66e3bd80 Mon Sep 17 00:00:00 2001
From: Christian Zimmermann <christian.zimmermann@ur.de>
Date: Thu, 3 Sep 2020 13:05:49 +0200
Subject: [PATCH] check compiler version

---
 CMakeLists.txt | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 64c01a9..bacd260 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,17 @@
 cmake_minimum_required(VERSION 2.8)
-
+  
 project(multi_array)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -std=c++14 -g -Wpedantic -Ofast -march=native -faligned-new -funroll-loops -fopenmp -ftemplate-backtrace-limit=0")
+if(CMAKE_COMPILER_IS_GNUCXX)
+  if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 7.0)
+    message(FATAL_ERROR "require gcc version >= 7.0")
+  endif()
+else()
+  message(WARNING "compiler ${CMAKE_CXX_COMPILER_ID} officially not supported")
+endif()
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -std=c++14 -Wpedantic -Ofast -march=native -faligned-new -funroll-loops -fopenmp")
+#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -std=c++14 -g -Wpedantic -Ofast -march=native -faligned-new -funroll-loops -fopenmp -ftemplate-backtrace-limit=0")
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -std=c++14 -g -Wpedantic -O0 -march=native -faligned-new -funroll-loops -fopenmp")
 
 enable_testing()