From dd90129066330c40b1e5c274bffa40f2500e9c31 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Mon, 29 Sep 2014 09:15:41 -0700
Subject: [PATCH] Check if type_traits actually work.

---
 test/CMakeLists.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 091d7c48..b0dfa587 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -36,8 +36,9 @@ foreach (src ${FMT_SOURCES})
   set(FMT_TEST_SOURCES ${FMT_TEST_SOURCES} ../${src})
 endforeach ()
 
-include(CheckIncludeFileCXX)
-check_include_file_cxx(type_traits HAVE_TYPE_TRAITS)
+check_cxx_source_compiles("
+  #include <type_traits>
+  int main() { return std::is_copy_constructible<int>::value; }" HAVE_TYPE_TRAITS)
 if (HAVE_TYPE_TRAITS)
   add_definitions(-DFMT_USE_TYPE_TRAITS=1)
 endif ()