[colm-users] libc++ compatibility

[Ryan Schmidt]

Hello,

The code that colm generates #include's the header <ext/stdio_filebuf.h>, which appears to be specific to libstdc++.

libstdc++ is deprecated on macOS. As of OS X 10.9 (2013) the default C++ standard library is libc++. As of macOS 10.14 (2018), the headers for libstdc++ have been removed.

Could you change your code generation so that it is compatible with libc++? Thanks.

-Ryan