cmake GDCM_CXX_HAS_FUNCTION examples

malaterre/GDCM Source/Common/CMakeLists.txt :61 

CHECK_CXX_SOURCE_COMPILES(
  "int main() { const char *f = __FUNCTION__; return 0;}"
  GDCM_CXX_HAS_FUNCTION)

InsightSoftwareConsortium/ITK Modules/ThirdParty/GDCM/src/gdcm/Source/Common/CMakeLists.txt :61 

CHECK_CXX_SOURCE_COMPILES(
  "int main() { const char *f = __FUNCTION__; return 0;}"
  GDCM_CXX_HAS_FUNCTION)