cmake DGCH_SMALL_VECTOR_TEST_HAS_CONSTEXPR examples

cvet/fonline ThirdParty/small_vector/source/test/unit/CMakeLists.txt :133 

try_compile (
    GCH_SMALL_VECTOR_TEST_HAS_CONSTEXPR
    ${CMAKE_CURRENT_BINARY_DIR}
    SOURCES
      ${CMAKE_CURRENT_LIST_DIR}/main.cpp
    CMAKE_FLAGS
      "-DINCLUDE_DIRECTORIES=${_TEST_INCLUDE_DIRS}"
    COMPILE_DEFINITIONS
      -DGCH_SMALL_VECTOR_TEST_HAS_CONSTEXPR
      -DGCH_SMALL_VECTOR_TEST_FILE=${CMAKE_CURRENT_BINARY_DIR}/test.cpp
    OUTPUT_VARIABLE
      GCH_SMALL_VECTOR_TEST_HAS_CONSTEXPR_OUTPUT
    CXX_STANDARD
      20
    CXX_STANDARD_REQUIRED
      OFF
    CXX_EXTENSIONS
      OFF
  )