Enhancement request: enabling Variant in C parsers

[Victor Khomenko]

Dear developers,

It would be nice to enable Variant in C parsers - these obviously have to be 
compiled with a C++ compiler.

Motivation:
 * I (and probably some other people) find some aspects of C++ parsers 
unwieldy, so prefer the good old C parsers in my C++ programs.
 * Maintaining/refactoring existing C parsers using variants is 
straightforward, whereas rewriting them as C++ parsers requires much effort.

Apologies if this was discussed earlier - I didn't find anything relevant in 
the mail archives though.

Thanks,
Victor.