Can you send all the information listed here:
https://www.open-mpi.org/community/help/
> On Jun 22, 2018, at 4:44 PM, lille stor <[email protected]> wrote:
>
> Thanks again Jeff.
>
> Here is the output of running "mpic++" with parameter "--showme" (in bold
> what "mpic++" added):
>
> g++ test.cpp -lUtils -pthread -Wl,-rpath -Wl,/home/dummy/openmpi/build/lib
> -Wl,--enable-new-dtags -L/home/dummy/openmpi/build/lib -lmpi
>
> This fails to compile with the error "Undefined reference to pthread_atfork".
>
> Nonetheless, if a program uses directly "libmpi.so" it can be compiled
> successfully with the parameters "-L/home/dummy/openmpi/build/lib -lmpi" like
> you suggested in a previous email).
>
> The problem is that the program I am trying to compile does not use directly
> "libmpi.so" but through the library "libMyUtils.so". This makes the usage of
> parameters "-L/home/dummy/openmpi/build/lib -lmpi" not possible.
>
> Any more suggestions?
>
> Thanks,
>
> L.
>
>
>
>
> Sent: Friday, June 22, 2018 at 10:17 PM
> From: "Jeff Squyres (jsquyres)" <[email protected]>
> To: "lille stor" <[email protected]>
> Cc: "Open MPI Developers List" <[email protected]>
> Subject: Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
> On Jun 22, 2018, at 4:09 PM, lille stor <[email protected]> wrote:
> >
> > I tried compile the C++ program using "mpic++" like you suggested but
> > unfortunately g++ still throws the same errror
> > ("/home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to
> > pthread_atfork").
> >
> > I suspect that the problem maybe to the fact that the C++ program does not
> > use directly Open MPI library but through another library (hence the
> > parameter "-Wl,-rpath-link,/home/dummy/openmpi/build/lib" when compiling
> > it), therefore one cannot pass the usual parameters
> > "-L/home/dummy/openmpi/build/lib -lmpi" to g++. To summarize the dependency
> > flow: program -> library -> Open MPI library.
>
> If your program uses mpic++ instead of g++, then mpic++ should add all the
> relevant parameters to compile an Open MPI program (including, if necessary,
> -pthread or -lpthread).
>
> What does "mpic++ --showme" show?
>
> Can you compile a simple C or C++ MPI program manually? (using mpicc /
> mpic++, without going through the secondary program)
>
> --
> Jeff Squyres
> [email protected]
>
--
Jeff Squyres
[email protected]
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