Strange, occasional build failure with ocamlmklib / ranlib

Strange, occasional build failure with ocamlmklib / ranlib

[Richard Jones]

I just want to post this here in case it rings a bell with anyone:

ocamlfind ocamlc -c guestfs.mli
ocamlfind ocamlc -c guestfs.ml
ocamlfind ocamlopt -c guestfs.ml
ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmo
-L../src/.libs -lguestfs
ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmx
-L../src/.libs -lguestfs
ranlib: './libmlguestfs.a': No such file

There's no other error visible.

The error is intermittent, and fairly rare.  Usually if we just run
the build again it succeeds.

We've seen the same bug happening on 3.09.3 and on 3.11.1+rc0.

There are more detailed build logs here:

https://bugzilla.redhat.com/show_bug.cgi?id=502309

Anyone got any ideas at all?

Rich.

-- 
Richard Jones
Red Hat

Re: [Caml-list] Strange, occasional build failure with ocamlmklib / ranlib

[Richard Jones]

On Tue, Jun 02, 2009 at 03:46:27PM +0100, Richard Jones wrote:
> I just want to post this here in case it rings a bell with anyone:
> 
> ocamlfind ocamlc -c guestfs.mli
> ocamlfind ocamlc -c guestfs.ml
> ocamlfind ocamlopt -c guestfs.ml
> ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmo
> -L../src/.libs -lguestfs
> ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmx
> -L../src/.libs -lguestfs
> ranlib: './libmlguestfs.a': No such file

I think I've solved this -- the therapeutic effect of posting on
caml-list works!

I think those two invocations of ocamlmklib are being run in parallel,
so one is deleting the output file of the other.

[...]
> https://bugzilla.redhat.com/show_bug.cgi?id=502309

Rich.

-- 
Richard Jones
Red Hat

Re: [Caml-list] Strange, occasional build failure with ocamlmklib / ranlib

[Olivier Andrieu]

On Tue, Jun 2, 2009 at 16:46, Richard Jones <rich@annexia.org> wrote:
> I just want to post this here in case it rings a bell with anyone:
>
> ocamlfind ocamlc -c guestfs.mli
> ocamlfind ocamlc -c guestfs.ml
> ocamlfind ocamlopt -c guestfs.ml
> ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmo
> -L../src/.libs -lguestfs
> ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmx
> -L../src/.libs -lguestfs
> ranlib: './libmlguestfs.a': No such file
>
> There's no other error visible.
>
> The error is intermittent, and fairly rare.  Usually if we just run
> the build again it succeeds.
>
> We've seen the same bug happening on 3.09.3 and on 3.11.1+rc0.
>
> There are more detailed build logs here:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=502309
>
> Anyone got any ideas at all?

Is it a parallel make ? If so, the concurrent ocamlmklib are probably
stepping on each other's toes ...
You could try either calling ocamlklib once, or 3 times (with the .o,
the .cmo and the .cmx);

-- 
  Olivier

Re: [Caml-list] Strange, occasional build failure with ocamlmklib / ranlib

[Martin Jambon]

Richard Jones wrote:
> I just want to post this here in case it rings a bell with anyone:
> 
> ocamlfind ocamlc -c guestfs.mli
> ocamlfind ocamlc -c guestfs.ml
> ocamlfind ocamlopt -c guestfs.ml
> ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmo
> -L../src/.libs -lguestfs
> ocamlmklib -o mlguestfs guestfs_c.o guestfs_c_actions.o guestfs.cmx
> -L../src/.libs -lguestfs
> ranlib: './libmlguestfs.a': No such file
> 
> There's no other error visible.
> 
> The error is intermittent, and fairly rare.  Usually if we just run
> the build again it succeeds.

Similar problem here (ocaml 3.09.2, amd64, Linux).  Because the error is
intermittent, I never took the pain to look at it further.  All I remember is
the pattern of the error message:

   ranlib: './your_ocaml_library_here.a': No such file

and the fact that it is infrequent and seems to occur randomly.


Martin


> We've seen the same bug happening on 3.09.3 and on 3.11.1+rc0.
> 
> There are more detailed build logs here:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=502309
> 
> Anyone got any ideas at all?
> 
> Rich.
> 


-- 
http://mjambon.com/