commit 9bb1ba6b76f6af2f32e2f146c3e97fdac67e8340
author Billy Robert O'Neal III <bion@microsoft.com> Wed Apr 27 18:47:03 2016 -0700
committer Billy Robert O'Neal III <bion@microsoft.com> Tue May 10 16:47:06 2016 -0700
tree b4ef9ec589bbe72bd5f80863a169fba5bc756e37
parent 60b59217359ecac2060637906e9eae14216a47d7

Fix clobbering of default CMAKE_CXX_FLAGS_RELEASE

BENCHMARK_ENABLE_LTO=true was completely replacing
CMAKE_CXX_FLAGS_RELEASE; meaning neither CMake's release defaults nor
user customizations were being applied.

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5940561..4424527 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,10 +39,10 @@
 
   # Link time optimisation
   if (BENCHMARK_ENABLE_LTO)
-    set(CMAKE_CXX_FLAGS_RELEASE "/GL")
-    set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "/LTCG")
-    set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "/LTCG")
-    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/LTCG")
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL")
+    set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG")
+    set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG")
+    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
   endif()
 else()
   # Try and enable C++11. Don't use C++14 because it doesn't work in some