Daniel Eischen wrote:
> [ CC list trimmed ]
>
> On Thu, 15 Feb 2001, Maxim Sobolev wrote:
> > You have totally misunderstood the purpose of my patch. The patch *isn't* intended
>as a quick fix for the recent -lc_r/-pthread weirdness, but instead it would provide
> > porting team with infrastructure necessary to start converting existing ports to
>the new world order. In a nutshell, -pthread should be replaced with ${PTHREAD_LIBS}
>and
> > -D_THREAD_SAFE with ${PTHREAD_CFLAGS} in all Makefiles from the ports collection.
>In addition all places where -pthread hardcoded in patches should also be identified
>and
> > adjusted to respect ${PTHREAD_LIBS} and ${PTHREAD_CFLAGS}.
>
> I support the addition of PTHREAD_CFLAGS/PTHREAD_LIBS to bsd.port.mk. It
> allows one to specify exactly which threads library they want to use
> (build against), even linuxthreads I would think.
>
> If it matters, I think we've decided to keep the -pthread linker
> option until FreeBSD gets its own libpthread at which point -pthread
> will be deprecated. So there's no urgent rush to convert ports
> to use the new mechanism if it's adopted.
You are not quite right (unfortunately). The current behaviour or -pthread breaks lots
of ports because by default gcc doesn't link shared modules with -lc_r even with this
flag, thus requiring that you to explicitly specify -pthread or -lc_r when linking
program with shared library that uses pthreads. Good example of such breakage is libGL
from
XFree86-4. This library requires pthreads, but most programs that use this library
don't use threads and as such have no idea why they need -pthread to link with libGL.
Therefore we have several choices:
1. Fix bazillion GL ports and ports with similar breakage by explicitly adding
-pthread into each one (poor choice IMO);
2. Make -pthread flag link shared modules with -lc_r (jdp is against this for not very
clear to me reasons);
3. Use -lc_r instead of -pthread in all threaded ports, which is equivalent to 2, BTW,
but jdp have no control over this.
-Maxim
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