Portability warnings: split into non-GNU and non-portable?

[Reuben Thomas]

automake 1.10 has started complaining about GNU Make-isms. This is fair 
enough, but it seems to satisfy a fairly small constituency (those using GNU 
autotools without GNU make) while annoying a rather larger one (those who 
enjoy the power of GNU make). While I understand why you'd want to make 
these warnings appear by default, it'd be nice to have a way to turn them 
off.

"That's -Wno-portability!" I hear you cry. Ah, but the documentation only 
tells me that -Wportability catches portability errors *including* GNU 
make-isms. I'm still keen to know about other portability errors I make.

Would it be possible to have separate warnings for use of GNU extensions and 
other non-portable usages? This would make life easier for the punctilious 
developer who also is content to require a GNU build environment.

--
http://rrt.sc3d.org/ | RSA, n.  safety in numbers