You may be seeing this? C language issues Default to -fno-common
A common mistake in C is omitting extern when declaring a global variable in a header file. If the header is included by several files it results in multiple definitions of the same variable. In previous GCC versions this error is ignored. GCC 10 defaults to -fno-common, which means a linker error will now be reported. To fix this, use extern in header files when declaring global variables, and ensure each global is defined in exactly one C file. If tentative definitions of particular variables need to be placed in a common block, __attribute__((__common__)) can be used to force that behavior even in code compiled without -fcommon. As a workaround, legacy C code where all tentative definitions should be placed into a common block can be compiled with -fcommon. https://gcc.gnu.org/gcc-10/porting_to.html On Thu, Sep 30, 2021 at 6:56 AM Carl Ponder via users < users@lists.open-mpi.org> wrote: > > For now, you can suppress this error building OpenMPI 4.1.1 > > ./.libs/liblocal_ops_avx512.a(liblocal_ops_avx512_la-op_avx_functions.o):(.data+0x0): > multiple definition of `ompi_op_avx_functions_avx2' > ./.libs/liblocal_ops_avx2.a(liblocal_ops_avx2_la-op_avx_functions.o):(.data+0x0): > first defined here > ./.libs/liblocal_ops_avx512.a(liblocal_ops_avx512_la-op_avx_functions.o): > In function`ompi_op_avx_2buff_min_uint16_t_avx2': > /project/muno/OpenMPI/BUILD/SRC/openmpi-4.1.1/ompi/mca/op/avx/op_avx_functions.c:651: > multiple definition of `ompi_op_avx_3buff_functions_avx2' > > ./.libs/liblocal_ops_avx2.a(liblocal_ops_avx2_la-op_avx_functions.o):/project/muno/OpenMPI/BUILD/SRC/openmpi-4.1.1/ompi/mca/op/avx/op_avx_functions.c:651: > first defined here > > with the NVHPC/PGI 21.9 compiler by using the setting > > configure -*-enable-mca-no-build=op-avx* ... > > We're still looking at the cause here. I don't have any advice about the > problem with 21.7. > > ------------------------------ > Subject: Re: [OMPI users] OpenMPI 4.1.1, CentOS 7.9, nVidia HPC-SDk, > build hints? > Date: Wed, 29 Sep 2021 12:25:43 -0500 > From: Ray Muno via users <users@lists.open-mpi.org> > <users@lists.open-mpi.org> > Reply-To: Open MPI Users <users@lists.open-mpi.org> > <users@lists.open-mpi.org> > To: users@lists.open-mpi.org > CC: Ray Muno <m...@aem.umn.edu> <m...@aem.umn.edu> > > External email: Use caution opening links or attachments > > > Tried this > > configure CC='nvc -fPIC' CXX='nvc++ -fPIC' FC='nvfortran -fPIC' > > Configure completes. Compiles quite a way through. Dies in a different > place. It does get past the > first error, however with libmpi_usempif08.la > > > FCLD libmpi_usempif08.la > make[2]: Leaving directory > > `/project/muno/OpenMPI/BUILD/4.1.1/ROME/NV-HPC/21.9/ompi/mpi/fortran/use-mpi-f08' > Making all in mpi/fortran/mpiext-use-mpi-f08 > make[2]: Entering directory > > `/project/muno/OpenMPI/BUILD/4.1.1/ROME/NV-HPC/21.9/ompi/mpi/fortran/mpiext-use-mpi-f08' > PPFC mpi-f08-ext-module.lo > FCLD libforce_usempif08_module_to_be_built.la > make[2]: Leaving directory > > `/project/muno/OpenMPI/BUILD/4.1.1/ROME/NV-HPC/21.9/ompi/mpi/fortran/mpiext-use-mpi-f08' > > Dies here now. > > CCLD liblocal_ops_avx512.la > CCLD mca_op_avx.la > ./.libs/liblocal_ops_avx512.a(liblocal_ops_avx512_la-op_avx_functions.o):(.data+0x0): > multiple > definition of `ompi_op_avx_functions_avx2' > ./.libs/liblocal_ops_avx2.a(liblocal_ops_avx2_la-op_avx_functions.o):(.data+0x0): > first defined here > ./.libs/liblocal_ops_avx512.a(liblocal_ops_avx512_la-op_avx_functions.o): > In function > `ompi_op_avx_2buff_min_uint16_t_avx2': > /project/muno/OpenMPI/BUILD/SRC/openmpi-4.1.1/ompi/mca/op/avx/op_avx_functions.c:651: > multiple > definition of `ompi_op_avx_3buff_functions_avx2' > > ./.libs/liblocal_ops_avx2.a(liblocal_ops_avx2_la-op_avx_functions.o):/project/muno/OpenMPI/BUILD/SRC/openmpi-4.1.1/ompi/mca/op/avx/op_avx_functions.c:651: > first defined here > make[2]: *** [mca_op_avx.la] Error 2 > make[2]: Leaving directory > `/project/muno/OpenMPI/BUILD/4.1.1/ROME/NV-HPC/21.9/ompi/mca/op/avx' > make[1]: *** [all-recursive] Error 1 > make[1]: Leaving directory > `/project/muno/OpenMPI/BUILD/4.1.1/ROME/NV-HPC/21.9/ompi' > make: *** [all-recursive] Error 1 > > > On 9/29/21 11:42 AM, Bennet Fauber via users wrote: > > Ray, > > If all the errors about not being compiled with -fPIC are still appearing, > there may be a bug that > is preventing the option from getting through to the compiler(s). It might > be worth looking through > the logs to see the full compile command for one or more of them to see > whether that is true? Say, > libs/comm_spawn_multiple_f08.o for example? > > If -fPIC is missing, you may be able to recompile that manually with the > -fPIC in place, then remake > and see if that also causes the link error to go away, that would be a good > start. > > Hope this helps, -- bennet > > > > On Wed, Sep 29, 2021 at 12:29 PM Ray Muno via users > <users@lists.open-mpi.org<mailto:users@lists.open-mpi.org> > <users@lists.open-mpi.org>> wrote: > > I did try that and it fails at the same place. > > Which version of the nVidia HPC-SDK are you using? I a m using 21.7. I > see there is an upgrade to > 21.9, which came out since I installed. I have that installed and will > try to see if they changed > anything. Not much in the releases notes to indicate any major changes. > > -Ray Muno > > > On 9/29/21 10:54 AM, Jing Gong wrote: > > Hi, > > > > > > Before Nvidia persons look into details,pProbably you can try to add > the flag "-fPIC" to the > > nvhpc compiler likes cc="nvc -fPIC", which at least worked with me. > > > > > > > > /Jing > > > > > > ---------------------------------------------------------------------------------------------------- > > *From:* users <users-boun...@lists.open-mpi.org > <mailto:users-boun...@lists.open-mpi.org> <users-boun...@lists.open-mpi.org>> > on > behalf of Ray Muno via users > > <users@lists.open-mpi.org <mailto:users@lists.open-mpi.org> > <users@lists.open-mpi.org>> > > *Sent:* Wednesday, September 29, 2021 17:22 > > *To:* Open MPI User's List > > *Cc:* Ray Muno > > *Subject:* Re: [OMPI users] OpenMPI 4.1.1, CentOS 7.9, nVidia HPC-SDk, > build hints? > > Thanks, I looked through previous emails here in the user list. > Iguess I need to subscribe > to the > > Developers list. > > > > -Ray Muno > > > > On 9/29/21 9:58 AM, Jeff Squyres (jsquyres) wrote: > >> Ray -- > >> > >> Looks like this is a dup of > https://github.com/open-mpi/ompi/issues/8919 > <https://github.com/open-mpi/ompi/issues/8919> > <https://github.com/open-mpi/ompi/issues/8919> > <https://github.com/open-mpi/ompi/issues/8919 > <https://github.com/open-mpi/ompi/issues/8919> > <https://github.com/open-mpi/ompi/issues/8919>> > >> <https://github.com/open-mpi/ompi/issues/8919 > <https://github.com/open-mpi/ompi/issues/8919> > <https://github.com/open-mpi/ompi/issues/8919> > <https://github.com/open-mpi/ompi/issues/8919 > <https://github.com/open-mpi/ompi/issues/8919> > <https://github.com/open-mpi/ompi/issues/8919>>>. > >> > >> > > > > -- > > Ray Muno > IT Systems Administrator > e-mail: m...@umn.edu <mailto:m...@umn.edu> <m...@umn.edu> > > University of Minnesota > Aerospace Engineering and Mechanics > > > > > -- > > Ray Muno > IT Systems Administrator > e-mail: m...@umn.edu > Phone: (612) 625-9531 > > University of Minnesota > Aerospace Engineering and Mechanics > 110 Union St. S.E. > Minneapolis, MN 55455 >
