GCC 12 needs -std=c++11

[Adam <adam%netbsd.org@localhost>]

While cross-buidling NetBSD-current on macOS with clang, I end up with:


/dist/src/external/gpl3/gcc/dist/libcpp/lex.cc:1168:8: warning: scoped enumerations are a C++11 extension [-Wc++11-extensions]
  enum class kind {
       ^
/dist/src/external/gpl3/gcc/dist/libcpp/lex.cc:1173:3: error: unknown type name 'constexpr'
  constexpr uchar utf8_start = 0xe2;
  ^
/dist/src/external/gpl3/gcc/dist/libcpp/lex.cc:1173:18: error: expected ';' after top level declarator
  constexpr uchar utf8_start = 0xe2;
                 ^
                 ;


My work-around is to use HOST_CXXFLAGS="-std=c++11". Maybe it should be set somewhere else in the code, so other users won't encounter the error?

Kind regards,
Adam