[lxc-devel] [PATCH] Link against pthread when not on bionic.

[Serge Hallyn]

Quoting Natanael Copa (ncopa at alpinelinux.org):
> On Mon, 18 Feb 2013 21:40:42 +0100
> Daniel Lezcano <daniel.lezcano at free.fr> wrote:
> 
> > On 02/18/2013 06:23 PM, Stéphane Graber wrote:
> > > dpkg spotted that we're not explicitly linking against pthread even though
> > > we use some of its symbols (sem_*).
> > 
> > uh ? wait.
> > 
> > We shouldn't link against the lib pthread.
> > 
> > I don't think sem_* is a symbol coming from the pthread library.
> 
> Seems to be with uClibc:
> 
> ncopa-desktop:~$ nm -D /lib/libpthread.so.0.9.32 | grep sem_
> 000000000000d168 T __new_sem_destroy
> 000000000000a914 T __new_sem_getvalue
> 000000000000a414 T __new_sem_init
> 000000000000c219 T sem_close
> 000000000000d168 W sem_destroy
> 000000000000a914 W sem_getvalue
> 000000000000a414 W sem_init
> 000000000000c744 T sem_open
> 0000000000006db0 T sem_post
> 0000000000006e00 T sem_timedwait
> 0000000000006f80 T sem_trywait
> 00000000000095c8 T sem_unlink
> 0000000000006fb0 T sem_wait
> 
> How about let autoconf detect what to link against?
> 
> @@ -274,6 +274,9 @@ AC_CHECK_HEADERS([sys/signalfd.h pty.h sys/capability.h sys/
>  # Check for some syscalls functions
>  AC_CHECK_FUNCS([setns pivot_root sethostname unshare])
>  
> +# find library for sem_*
> +AC_SEARCH_LIBS(sem_open, [pthread rt])

I like it.  thanks.

> +
>  # Check for some functions
>  AC_CHECK_LIB(util, openpty)
>  AC_CHECK_FUNCS([openpty hasmntopt setmntent endmntent])
> 
> 
> 
> 
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