Date: Mon, 7 Mar 2005 09:38:45 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Jonathon McKitrick <jcm@FreeBSD-uk.eu.org> Cc: freebsd-questions@freebsd.org Subject: Re: Which lib for pthreads? Message-ID: <20050307153845.GF2272@dan.emsphone.com> In-Reply-To: <20050307122229.GA36571@dogma.freebsd-uk.eu.org> References: <20050305183226.GA47472@dogma.freebsd-uk.eu.org> <20050306011827.GE2272@dan.emsphone.com> <20050306213249.GA4624@dogma.freebsd-uk.eu.org> <20050306213955.GA11496@gothmog.gr> <20050306215500.GA5571@dogma.freebsd-uk.eu.org> <422BAB2E.9060703@mac.com> <20050307122229.GA36571@dogma.freebsd-uk.eu.org>
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In the last episode (Mar 07), Jonathon McKitrick said:
> On Sun, Mar 06, 2005 at 08:15:26PM -0500, Chuck Swiger wrote:
> : Um. If you are compiling C++ code into an object file, you ought
> : to use c++ and not cc when linking, too.
>
> I'm using ${CC} in the makefile, and it seems to automagically choose
> the correct tool.
>
> : Also, you may not have relinked 'app'. Do an ldd on app and see
> : whether it has a dependency on libc_r? Try relinking app using
> : -pthread against a libplugina.so compiled with -pthread...
>
> That was the problem. I thought only the library with the thread
> calls needed to be linked with pthread. Apparently the app needs it
> as well.
Ideally not; dynamic shared libraries can list dependencies:
$ ldd /usr/lib/libreadline.so
/usr/lib/libreadline.so:
libncurses.so.5 => /lib/libncurses.so.5 (0x2819a000)
I'm pretty sure static libs could do the same at one time, but I can't
find any documentation to back that up.
--
Dan Nelson
dnelson@allantgroup.com
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