glslang build: force the use of -std=c++11 when building with Clang. David Neto <dneto@google.com>.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31583 e7fa87d3-cd2b-0410-9028-fcbf551c1848

CMakeLists.txt

@@ -15,6 +15,8 @@ endif(WIN32)
 
 if(CMAKE_COMPILER_IS_GNUCXX)
     add_definitions(-std=c++11)
+elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
+    add_definitions(-std=c++11)
 endif()
 
 add_subdirectory(glslang)