Re: -xc99=all and libraries on Solaris 10

[Bob Friesenhahn]

On Sun, 26 Dec 2010, Bruno Haible wrote:

> Hi,
>
> Reviving an old thread from February 2010.
> In <http://lists.gnu.org/archive/html/autoconf/2010-02/msg00013.html>
> Peter O'Gorman wrote:
>
> > When creating a library or application with c99 or cc -xc99=all
> > /usr/lib/values-xpg6.o is included in the output, this object file
> > contains the c99 definitions for __xpg4 and __xpg6. When creating output
> > without c99/-xc99=all this extra object is not put into the output and
> > the values of __xpg4 and __xpg6 in libc (c89 behavior) are used (because
> > they are the only definitions available).
>
> I confirm with a test program.

Bruno,

This topic is currently discussed on the autoconf list.  It seems to 
me that it has implications for libtool as well.  I think that this is 
a very similar issue to how pthreads are handled (and which libtool 
now accounts for).  The issue for libtool is if it should remember if 
/usr/lib/values-xpg4.o or /usr/lib/values-xpg6.o needs to be included 
in the output (via a library .la file).  There is also the issue that 
c99-linked code should (ideally) not be mixed with older code.  All 
code should be compiled and linked at the same 'xpg' level in order to 
assure original consistent operation.  GNU's desire to promote the 
latest standards results in older already-installed libraries behaving 
differently than they originally did after a newer library is added.

Due to this, I am Cc:ing the libtool list in this reply.

Bob
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/