Tests/RunCMake/CXXModules/compiler_introspection.cmake

   1 enable_language(CXX)
   2
   3 set(info "")
   4
   5 # See `Modules/Compiler/MSVC-CXX.cmake` for this. If there is explicitly no
   6 # default, the feature list is populated to be everything.
   7 if (DEFINED CMAKE_CXX_STANDARD_DEFAULT AND
   8     CMAKE_CXX_STANDARD_DEFAULT STREQUAL "")
   9   set(CMAKE_CXX_COMPILE_FEATURES "")
  10 endif ()
  11
  12 # Detect if the environment forces a C++ standard, let the test selection know.
  13 set(forced_cxx_standard 0)
  14 if (CMAKE_CXX_FLAGS MATCHES "-std=")
  15   set(forced_cxx_standard 1)
  16 endif ()
  17
  18 # Forward information about the C++ compile features.
  19 string(APPEND info "\
  20 set(CMAKE_CXX_COMPILE_FEATURES \"${CMAKE_CXX_COMPILE_FEATURES}\")
  21 set(CMAKE_MAKE_PROGRAM \"${CMAKE_MAKE_PROGRAM}\")
  22 set(forced_cxx_standard \"${forced_cxx_standard}\")
  23 ")
  24
  25 file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/info.cmake" "${info}")