Re: CVS commit: src/include

[Matthias Drochner <M.Drochner%fz-juelich.de@localhost>]

[defining _XOPEN_SOURCE means XPG4.2]
joerg%britannica.bec.de@localhost said:
> We document it as such in sys/featuretest.h. 

Yes, and this is what other systems I've checked do as well.

The linux feature_test_macros(7) manpage says:

_XOPEN_SOURCE 
    Defining this macro with any value causes header files to expose 
definitions
    conforming to POSIX.1, POSIX.2, and XPG4. Defining with the value
    500 or greater additionally exposes definitions for SUSv2 (UNIX 98). 
Defining
    with the value 600 or greater additionally exposes definitions for
    SUSv3 (UNIX 03; i.e., the POSIX.1-2001 base specification plus the XSI 
extension)
    and C 99 definitions.

and later:

POSIX.1 specifies _POSIX_C_SOURCE, _POSIX_SOURCE, and _XOPEN_SOURCE.

OSF/1 and solaris are similar. (Solaris has an additional _XOPEN_VERSION
variable to distinguish between XPG3 and XPG4.)

I haven't found any standard or manpage which suggests defining
_XOPEN_SOURCE to "3" or "4".

best regards
Matthias




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