Date: Thu, 18 Mar 2004 16:33:25 -0600 (CST) From: Archie Cobbs <archie@dellroad.org> To: freebsd-standards@freebsd.org Subject: _BSD_SOURCE vs. __BSD_VISIBLE Message-ID: <200403182233.i2IMXPuJ002724@arch20m.dellroad.org>
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Hi,
Apologies if this is an old question, searching the archives didn't yeild
any answers.
All I'm trying to do is write some portable code :-)
Here "portable" simply means that it compiles on both FreeBSD and Linux.
In order to get the various functions I need I have to set a bunch of flags.
On Linux, these flags do the trick (taken from configure.in):
AC_DEFINE(_XOPEN_SOURCE, 600, XOpen functions)
AC_DEFINE(_GNU_SOURCE, 1, GNU functions)
AC_DEFINE(_BSD_SOURCE, 1, BSD functions)
AC_DEFINE(_ISOC99_SOURCE, 1, ISO C99 functions)
AC_DEFINE(_POSIX_VERSION, 200112, POSIX version)
AC_DEFINE(_POSIX_C_SOURCE, 200112, POSIX functions)
On FreeBSD, _BSD_SOURCE is not recognized, but _POSIX_C_SOURCE is and
it actually causes the BSD functions to be hidden. So I have to manually
add __BSD_VISIBLE to get them on FreeBSD.
Q1: Why does Linux require _BSD_SOURCE but FreeBSD requires __BSD_VISIBLE?
Q2: Is there some standard for these flags documented somewhere?
Q3: What is the right and portable set of flags to use?
Any enlightenment is greatly appreciated.
Thanks,
-Archie
P.S. Please CC: me as I'm not on this list.
__________________________________________________________________________
Archie Cobbs * CTO, Awarix * http://www.awarix.com
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