tree 7d47323348a32fd059c4ac2837dd69e5bfd3e239
parent d7a95968ac1a809ae3d47d2ca18471ef91f29f98
author Alex Stewart <alexs.mac@gmail.com> 1529263971 +0100
committer Sameer Agarwal <sameeragarwal@google.com> 1529275455 +0000

Do not update CMAKE_REQUIRED_FLAGS to match CMAKE_CXX_FLAGS.

- This was a hangover from the pre-Ceres 2.0 era when we needed to
  ensure that -std=c++11 was passed to check_cxx_source_compiles() in
  FindUnorderedMap/FindSharedPtr if the user had enabled CXX11.
- Unfortunately, the same variable (CMAKE_REQUIRED_FLAGS) is used for
  both check_cxx_source_compiles() and check_c_source_compiles(), and
  thus updating it to include -std=c++11 would thus break any checks
  for C, which are made internally in the version of FindThreads.cmake
  shipped with CMake which could cause build breakage as identified
  in issue #355.

Change-Id: I36be1a21db14e3839eaf955a80bd952ef40fa269