cmake GDCM_HAVE_CODECVT examples

malaterre/GDCM Source/Common/CMakeLists.txt :67 

CHECK_CXX_SOURCE_COMPILES(
  "\#include <string>\n#include <codecvt>\n#include <locale>\nint main() { std::u16string u16; std::string utf8 = std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.to_bytes(u16); }"
  GDCM_HAVE_CODECVT)

InsightSoftwareConsortium/ITK Modules/ThirdParty/GDCM/src/gdcm/Source/Common/CMakeLists.txt :67 

CHECK_CXX_SOURCE_COMPILES(
  "\#include <string>\n#include <codecvt>\n#include <locale>\nint main() { std::u16string u16; std::string utf8 = std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.to_bytes(u16); }"
  GDCM_HAVE_CODECVT)