Index: llvm/utils/benchmark/CMakeLists.txt
===================================================================
--- llvm/utils/benchmark/CMakeLists.txt
+++ llvm/utils/benchmark/CMakeLists.txt
@@ -131,12 +131,7 @@
     set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL} /LTCG")
   endif()
 else()
-  # Try and enable C++11. Don't use C++14 because it doesn't work in some
-  # configurations.
-  add_cxx_compiler_flag(-std=c++11)
-  if (NOT HAVE_CXX_FLAG_STD_CXX11)
-    add_cxx_compiler_flag(-std=c++0x)
-  endif()
+  add_cxx_compiler_flag(-std=c++14)
 
   # Turn compiler warnings up to 11
   add_cxx_compiler_flag(-Wall)