Re: AIX compilation problem

[Dan Kegel]

Saravanan Bellan wrote:
> I was trying to compile ncurses 5.3 with the widec option on AIX 4.3. After
> a lot of trial and error, I got it compiled after setting the the following
> variables,
>
> $ ./configure CFLAGS="-D_XOPEN_SOURCE=500 -D_ALL_SOURCE" --enable-widec
>
> _XOPEN_SOURCE used in wchar.h
> _ALL_SOURCE in sys/ioctl.h
>
> Can anyone explain what those variables mean?

glibc uses similar defines.  From glibc's features.h:

/* These are defined by the user (or the compiler)
   to specify the desired environment:

   __STRICT_ANSI__  ISO Standard C.
   _ISOC99_SOURCE   Extensions to ISO C89 from ISO C99.
   _POSIX_SOURCE    IEEE Std 1003.1.
   _POSIX_C_SOURCE  If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
            if >=199309L, add IEEE Std 1003.1b-1993;
            if >=199506L, add IEEE Std 1003.1c-1995
   _XOPEN_SOURCE    Includes POSIX and XPG things.  Set to 500 if
            Single Unix conformance is wanted, to 600 for the
            upcoming sixth revision.
   _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
   _LARGEFILE_SOURCE    Some more functions for correct standard I/O.
   _LARGEFILE64_SOURCE  Additional functionality from LFS for large files.
   _FILE_OFFSET_BITS=N  Select default filesystem interface.
   _BSD_SOURCE      ISO C, POSIX, and 4.3BSD things.
   _SVID_SOURCE     ISO C, POSIX, and SVID things.
   _GNU_SOURCE      All of the above, plus GNU extensions.
   _REENTRANT       Select additionally reentrant object.
   _THREAD_SAFE     Same as _REENTRANT, often used by other systems.
...

--
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045