[PATCH] [libcxx] Update the way the -std= flag is chosen by CMake and LibcxxTestFormat

[Eric Fiselier]

Implement Dan's comments regarding the c++1y flag. It is now off by default. If it is enabled CMake will fail instead of falling back on c++11. If the c++1y flag is off then c++11 will be selected. If the compiler does not support c++11 CMake will fail.

http://reviews.llvm.org/D4329

Files:
  CMakeLists.txt
  cmake/config-ix.cmake
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
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