[sheepdog] [PATCH] sheepfs: add -lpthread to the linker option

[Hitoshi Mitake]

At Thu, 12 Sep 2013 10:58:51 +0800,
Liu Yuan wrote:
> 
> On Thu, Sep 12, 2013 at 01:38:38AM +0900, Hitoshi Mitake wrote:
> > Because libsheepdog wraps pthread reader writer lock, the flag is
> > required for building sheepfs too.
> > 
> > Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
> > ---
> >  sheepfs/Makefile.am | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/sheepfs/Makefile.am b/sheepfs/Makefile.am
> > index 10b8c3b..1e571ae 100644
> > --- a/sheepfs/Makefile.am
> > +++ b/sheepfs/Makefile.am
> > @@ -26,7 +26,7 @@ sbin_PROGRAMS		= sheepfs
> >  sheepfs_SOURCES		= core.c cluster.c vdi.c shadow_file.c volume.c node.c \
> >  			  config.c
> >  
> > -sheepfs_LDADD	  	= ../lib/libsheepdog.a $(fuse_LIBS) $(LIBS)
> > +sheepfs_LDADD	  	= ../lib/libsheepdog.a $(fuse_LIBS) $(LIBS) -lpthread
> >  sheepfs_DEPENDENCIES	= ../lib/libsheepdog.a
> >  
> >  noinst_HEADERS		= sheepfs.h
> 
> What does this patch tries to fix? I can complie without problems for sheepfs on
> my box. And you can't?

I faced the build error during building sheepfs like this:

  CCLD   sheepfs
/usr/bin/ld: volume.o: undefined reference to symbol 'pthread_rwlock_wrlock@@GLIBC_2.2.5'
/usr/bin/ld: note: 'pthread_rwlock_wrlock@@GLIBC_2.2.5' is defined in DSO /lib/x86_64-linux-gnu/libpthread.so.0 so try adding it to the linker command line
/lib/x86_64-linux-gnu/libpthread.so.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make[1]: *** [sheepfs] Error 1

My environment is Ubuntu 13.04. But I could build sheepfs successfully
on my debian box. I'll seek the root cause of this error and report
later. Please ignore this patch now, sorry.

Thanks,
Hitoshi