If compiler predefined macros like __linux__ or __NetBSD__ are OK for <skalibs/nonposix.h>, how about #if defined(__linux__) || defined(__GNU__)? GCC predefines both __GNU__ and __gnu_hurd__ (I think, can be checked with 'cpp -dM - </dev/null') when compiling for the Hurd, and I suppose no other compiler targets that OS...
Do you mean __GNUC__ instead of __GNU__ ? Testing defined(__GNUC__) would yield true whenever the compiler is gcc, so _GNU_SOURCE would be defined even on BSDs when people use gcc. Not optimal, and would make behaviour different depending on the compiler. I'd rather #define _GNU_SOURCE unconditionally.
Do you mean doing something like: #ifndef PATH_MAX #define PATH_MAX 4096 #endif or removing references to PATH_MAX altogether?
The latter wherever possible. It's easy enough to compile with -DPATH_MAX=4096, and I'd rather keep it like this than pretend to work without PATH_MAX but fail with very long path names. -- Laurent
