From a6990bbf9ccc93448560bac29baa1a938ca38e50 Mon Sep 17 00:00:00 2001
From: Martin Quinson <martin.quinson@loria.fr>
Date: Sat, 27 Oct 2018 22:06:53 +0200
Subject: [PATCH] Simplify how we check for C++11 and friends

---
 CMakeLists.txt | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 77973ccfab..3aab3e42a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,33 +32,12 @@ if (CMAKE_COMPILER_IS_GNUCC)
   endif()
 endif()
 
-## We need a decent support of the c++11 standard
-include(CheckCXXCompilerFlag)
-CHECK_CXX_COMPILER_FLAG("-std=gnu++11" COMPILER_SUPPORTS_CXX11)
-if(COMPILER_SUPPORTS_CXX11)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
-else() 
-  message(FATAL_ERROR 
-          "The compiler ${CMAKE_CXX_COMPILER} (v${CMAKE_CXX_COMPILER_VERSION}) has no C++11 support. "
-          "Please install a decent C++ compiler (remove CMakeCache.txt once it's installed).")
-endif()
-
-### And we need C11 standard, too
-include(CheckCCompilerFlag)
-CHECK_C_COMPILER_FLAG("-std=gnu11" COMPILER_SUPPORTS_C11)
-if(COMPILER_SUPPORTS_C11)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
-else()
-  message(FATAL_ERROR 
-          "The compiler ${CMAKE_C_COMPILER} (v${CMAKE_C_COMPILER_VERSION}) has no C11 support. "
-          "Please use a decent C compiler "
-          "(note that c++11 support of ${CMAKE_CXX_COMPILER} seems ok).")
-endif()
-if(APPLE AND (CMAKE_C_COMPILER_VERSION VERSION_LESS "4.6"))
-  ### gcc 4.[1-5] cannot compile ucontext on OSX
-  message(STATUS "Ucontext can't be used with this version of gcc (must be greater than 4.5)")
-  set(HAVE_UCONTEXT_H 0)
-endif()
+## We need a decent support of the C++11 and C11 standards
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
 
 ### Check threading support
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
-- 
2.20.1