#define PERL_EXT to get feature test macros

There's some handy macros in feature.h that define useful tests like

    if (!FEATURE_SIGNATURES_IS_ENABLED)
        Perl_croak(aTHX_ "Experimental subroutine signatures not enabled");

If I do something like this then I can use them in an XS module:

  #define PERL_EXT
  #include "feature.h"

Is that a good idea? If not, could it become one somehow? It'd be
useful to have a nice way for XS modules (especially those implementing
syntax features) to easily query such state. Without this I'd have to
do quite a bit of copy-pasting from internals to get the same effect.

-- 
Paul "LeoNerd" Evans

leonerd@leonerd.org.uk      |  https://metacpan.org/author/PEVANS
http://www.leonerd.org.uk/  |  https://www.tindie.com/stores/leonerd/

• #define PERL_EXT to get feature test macros by Paul "LeoNerd" Evans
• Re: #define PERL_EXT to get feature test macros by ilmari