Date: Wed, 24 Sep 2003 16:39:53 -0400 (EDT) From: Daniel Eischen <eischen@vigrid.com> To: Michael Edenfield <kutulu@kutulu.org> Cc: Freebsd Current <current@freebsd.org> Subject: Re: Fixing -pthreads (Re: ports and -current) Message-ID: <Pine.GSO.4.10.10309241626140.7454-100000@pcnet5.pcnet.com> In-Reply-To: <20030924171949.GA90989@wombat.localnet>
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On Wed, 24 Sep 2003, Michael Edenfield wrote: > * Ian Dowse <iedowse@maths.tcd.ie> [030924 12:03]: > > In message <Pine.GSO.4.10.10309241029001.26896-100000@pcnet5.pcnet.com>, Daniel > > Eischen writes: > > >On Wed, 24 Sep 2003, Scott Long wrote: > > >> PTHREAD_LIBS is a great tool for the /usr/ports mechanism, but doesn't > > >> mean anything outside of that. > > > > > >That just meant it makes it easier to maintain ports so that > > >they are PTHREAD_LIBS compliant (they would break when linked). > > >I know it has no bearing on 3rd party stuff. > > > > Just to throw one further approach out on the table, below is a > > patch that makes gcc read from a file to determine what library to > > associate with the -pthread flag. It's a hack of course, and probably > > neither correct or optimal. If you want to make -pthread mean libkse, > > create an /etc/pthread.libs that looks like: > > I was looking through gcc last night to see how conceptually difficult > it would be to do something like this. But instead of a file, I was > thinking of this process: > > * if env("PTHREADS_LIBS") then LDFLAGS += PTHREADS_LIBS > * elseif fileexists("libpthread") then LDFLAGS += -lpthread > * elseif fileexists("libthr") then LDFLAGS += -lthr > * elseif fileexists("libc_r") then LDFLAGS += -lc_r > * else error("Threading not supported.") Out of all the suggestions (aside from making -pthread a NOOP), this is my favorite one. I would also make -pthread a NOOP when building shared && dynamic. I plan on changing thread library compatibility for FreeBSD 6.0, though. So it might be wise just to add a different compiler switch for libthr or libc_r. -- Dan Eischen
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