On Fri, Dec 13, 2019 at 01:55:33PM -0800, Khem Raj wrote: > On Thu, Dec 12, 2019 at 8:37 PM Adrian Bunk <[email protected]> wrote: > > On Thu, Dec 12, 2019 at 12:22:52PM -0800, Khem Raj wrote: >... > > > +_POSIX_SOURCE is app-defined not system > > > > This is true for musl, not for glibc. > > > > The handling of _POSIX_SOURCE and _POSIX_VERSION differs between musl > > and glibc due to glibc supporting older POSIX versions, and glibc also > > supporting developers of portable code to select some specific older > > POSIX version. > > > No thats not right. > _POSIX_SOURCE (like all FTMs) is > defined by the application to request a feature/standards profile > it's not libc telling you "this is posix" or anything like that.
It is also defined when _POSIX_C_SOURCE is defined, or _GNU_SOURCE, or when the default non-strict gcc mode is used. The latter means that it is in practice nearly always defined when the libc supports applications written against older versions of POSIX. > _POSIX_VERSION tells you that >... _POSIX_VERSION being defined tells you that you have unistd.h included. With glibc the value of _POSIX_VERSION depends on what feature/standards profile the application has requested. cu Adrian -- _______________________________________________ Openembedded-devel mailing list [email protected] http://lists.openembedded.org/mailman/listinfo/openembedded-devel
