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Re: [Libguestfs] Ocaml and pthread_atfork()

On Thu, May 03, 2012 at 02:00:27PM +1000, Tony Breeds wrote:
> Hi All,
> 	Firstly I apologize if this is noise.  I elected to not file a
> bugzilla as the problem seems to be powerpc specific and with the limited
> resources for Fedora developers it would seem unfair.
> I was recently trying to build a "current" libguestfs from the f16
> branch[1].  During the build I hit:
> (extracted from rpmbuild)
> [tony sneetch ~]$ bash -x  tmp/ocaml-test.sh 
> + cd rpmbuild/BUILD/libguestfs-1.16.9/ocaml/
> + LD_LIBRARY_PATH=../src/.libs
> + ocamlfind ocamlc -g -warn-error CDEFLMPSUVYZX -I . -package unix,threads -thread -linkpkg mlguestfs.cma t/guestfs_070_threads.cmo -o t/guestfs_070_threads.bc
> File "_none_", line 1, characters 0-1:
> Error: Error on dynamically loaded library: /usr/lib64/ocaml/stublibs/dllthreads.so: /usr/lib64/ocaml/stublibs/dllthreads.so: undefined symbol: pthread_atfork
> I did a quick bit of googling and found:
> http://ryanarn.blogspot.com.au/2011/07/curious-case-of-pthreadatfork-on.html
> which seems to explain what's going on to my naive eye anyway.
> I've tried a few different CFLAGS/patches to
> otherlibs/systhreads/Makefile to try and induce pthreads_atfork() to be
> resolved and linked during the ocaml build.  Nothing I try works.
> Does anyone have any ideas on how to solve this?
> I'm happy to do the heavy lifting I just don't have the background in
> ocaml to solve this by myself.
> Yours Tony
> [1] I suspects that as a result of the demotion to secondary and things
>     languishing there we skipped a few builds.

It looks like the PPC64 OCaml package is buggy.  Can you compile any
threaded program at all, eg:

  echo 'print_endline "hello"' > test.ml
  ocamlfind c -package threads -thread test.ml -linkpkg -o test

Unfortunately I don't have access to ppc64, so there's no way I can
even look at bugs in this area, let alone fix them.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
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