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Is there a way with feature test macros to have glibc expose GNU extensions (functions not specified in POSIX, and additional flag/argument macros for standard functions, like MAP_ANONYMOUS), but still prefer POSIX semantics whenever the POSIX and GNU definitions conflict? I’m thinking things like basename, strerror_r, etc.
For the specific case of
basename(), including<libgen.h>header gives you the XPG / POSIX definition.MAP_ANONYMOUSisn’t a GNU extension (_GNU_SOURCE), it’s defined if either_BSD_SOURCEor_SVID_SOURCEis defined.