From 0a6e17b4ff21471247f172f8a019102c7185dadc Mon Sep 17 00:00:00 2001
From: Raphael Dumusc <raphael.dumusc@epfl.ch>
Date: Wed, 5 Aug 2015 14:54:02 +0200
Subject: [PATCH] Warn users of TestCPP11 if it runs multiple times (for each
 subproject).

---
 TestCPP11.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/TestCPP11.cmake b/TestCPP11.cmake
index 96d54af..b1914b0 100644
--- a/TestCPP11.cmake
+++ b/TestCPP11.cmake
@@ -7,6 +7,11 @@ if(TESTS_CPP11_DONE)
 endif()
 set(TESTS_CPP11_DONE ON)
 
+if(NOT PROJECT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+  message(WARNING "For better performance, include TestCPP11 in the top-level "
+    "project so that it is run only once.")
+endif()
+
 set(TESTS_CPP11 sharedptr tuple auto nullptr array final_override unordered_map
   template_alias)