I was unable to reproduce this on Ubuntu 14.04.5 Note the default gcc is 4.8 gcc-4.9 can be installed, but no g++ nor gfortran.
Did you build Open MPI with the same compiler used to build libUtils.so and a.out What do type gcc ls -l /usr/bin/gcc gcc —version g++ —version say ? On top of the info previously requested by Jeff, can you also share a minimal libUtils.c[pp] and test.cpp (with the build command line) so we can reproduce the issue ? Cheers, Gilles On Saturday, June 23, 2018, lille stor <lille.s...@gmx.com> wrote: > Hi, > > > > When compiling a C++ source file named test.cpp that needs a shared > library named libUtils.so (which in its turn needs Open MPI shared > library, hence the parameter -Wl,-rpath-link,/home/dummy/openmpi/build/lib > ) as follows: > > g++ test.cpp -lUtils -Wl,-rpath-link,/home/dummy/openmpi/build/lib > > An error is thrown /home/dummy/openmpi/build/lib/libopen-pal.so.20: > undefined reference to pthread_atfork. > > I passed -pthread and -lpthread (before and after -lUtils) to g++ but > none of these solved the error. > > > > Environment where this error is thrown: > OS: Ubuntu 14.04 > Compiler: g++ 4.9 > MPI: Open MPI 2.1.3 > > > > Thank you for your help, > > L. > > >
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