Look at adding functions from Module::Build::XSUtil

[wolfsage]

Module::Build::XSUtil has implemented some missing functionality in Devel::PPPort. Port it in.

https://metacpan.org/source/HIDEAKIO/Module-Build-XSUtil-0.06/lib/Module/Build/XSUtil.pm#L231

[Leont]

The original is actually from Module::Install::XSUtil, it seems.

It seems __attribute__format__ and newSVpvs_share are already supported. CvGV_set should definitely be supported (given CvGV is no longer an lvalue since 5.recentish). GvNAME_get, GvNAMELEN_get, LIKELY, UNLIKELY and STATIC_INLINE all seem rather reasonable too.

I have no idea what the LooksLikeNumber is about exactly, it must be working around some kind of bug on older releases. It doesn't appear to be actually used though.

newAV_mortal, newHV_mortal, newRV_inc_mortal, newRV_noinc_mortal seem to be innovations of xshelper, though they might be useful enough that backporting to core is an option.

DECL_BOOT and CALL_BOOT are not used anywhere outside of Mouse, I think we can safely ignore those.