set(USE_CLANG "d:/clang/bin")

if(DEFINED USE_CLANG)

  set (CMAKE_C_COMPILER             "${USE_CLANG}/clang.exe")
  set (CMAKE_C_FLAGS                "-Wall -std=c99")
  set (CMAKE_C_FLAGS_DEBUG          "-g")
  set (CMAKE_C_FLAGS_MINSIZEREL     "-Os -DNDEBUG")
  set (CMAKE_C_FLAGS_RELEASE        "-O4 -DNDEBUG")
  set (CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -g")


  set (CMAKE_CXX_COMPILER             "${USE_CLANG}/clang.exe")
  set (CMAKE_CXX_FLAGS                "-Wall")
  set (CMAKE_CXX_FLAGS_DEBUG          "-g")
  set (CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG")
  set (CMAKE_CXX_FLAGS_RELEASE        "-O4 -DNDEBUG")
  set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")
  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wextra")

  set (CMAKE_AR      "${USE_CLANG}/llvm-ar.exe")
  set (CMAKE_LINKER  "${USE_CLANG}/llvm-ld.exe")
  set (CMAKE_NM      "${USE_CLANG}/llvm-nm.exe")
  set (CMAKE_OBJDUMP "${USE_CLANG}/llvm-objdump.exe")
  set (CMAKE_RANLIB  "${USE_CLANG}/llvm-ranlib.exe")

elseif(${CMAKE_COMPILER_IS_GNUCXX})