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 <lille.s...@gmx.com> 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)" <jsquy...@cisco.com> > To: "lille stor" <lille.s...@gmx.com> > Cc: "Open MPI Developers List" <devel@lists.open-mpi.org> > Subject: Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork > On Jun 22, 2018, at 4:09 PM, lille stor <lille.s...@gmx.com> 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 > jsquy...@cisco.com > -- Jeff Squyres jsquy...@cisco.com _______________________________________________ devel mailing list devel@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/devel