Re: [PATCH] OpenBSD -pthread fix

[Bob Friesenhahn]

On Sun, 21 Sep 2003, Peter O'Gorman wrote:

> Bob Friesenhahn wrote:
>
> > If options like -pthread are not passed through then the link may fail
> > or produce the wrong result since -pthread may secretly add libraries,
> > or change the entire library selection logic.  I have developed for an
> > OS (LynxOS) which provided a completely different set of libraries if
> > -pthread was specified.
>
> So -pthread needs special treatment, fair enough. As far as I know
> (haven't checked) -pthread does not get put into dependency_libs by
> current cvs libtool, if it requires special treatment, it ought to be
> written there as well as read and passed through to the linker. Correct?

To muddy the waters a bit more, some platforms (e.g. Solaris) provide
stubbed thread functions in libc which are used by the linker if
-lpthread is not supplied.  This works due to "weak linkage".  Some
libraries prepared for multi-thread use will still appear to work even
if -lpthread is missing when a dependent app is linked.

Bob
======================================
Bob Friesenhahn
address@hidden
http://www.simplesystems.org/users/bfriesen