Hi, Absolutely no issues here when using gcc10 from homebrew both on intel and ARM. Here is my configuration options: ./configure --prefix=$MPICH_HOME \ --enable-fast=all,O3 \ --enable-g=dbg \ --enable-romio \ --enable-shared \ --enable-sharedlibs=gcc-osx \ --with-pm=hydra \ CC=gcc-10 CXX=g++-10 FC=gfortran-10 F77=gfortran-10 \ CFLAGS="-fgnu89-inline -Wno-deprecated" \ CXXFLAGS="-Wno-deprecated" \ FFLAGS="-fallow-argument-mismatch" Blaise On Feb 18, 2021, at 3:53 PM, Allen Sanderson via discuss <[email protected]<mailto:[email protected]>> wrote: Hello, First post to the discussion board. I made the mistake of upgrading to macOS 11.2 (aka Big Sur). I was able to build MPICH 3.4.1 successfully and integrate it with an application. However, when I ran, MPICH crashed. Here is the initial output: Abort(1) on node 0: Internal error 0 libpmpi.12.dylib 0x00000001068c2159 MPL_backtrace_show + 57 1 libpmpi.12.dylib 0x000000010684e874 MPIR_Assert_fail + 36 2 libpmpi.12.dylib 0x0000000106897bc8 MPIDI_OFI_mpi_init_hook + 4472 3 libpmpi.12.dylib 0x00000001068790d3 MPID_Init + 3091 4 libpmpi.12.dylib 0x00000001066ae70b MPIR_Init_thread + 219 5 libmpi.12.dylib 0x00000001064bb897 MPI_Init + 279 I have not yet dug into the issue any further. Before doing so I wanted to first check to see if others have successfully built and run via macOS 11.2. If so I would appreciate any pointers. If it is known that it will not yet work, that would be good information as well so not to spend anytime digging. I should note that on another machine, I was wiser and upgraded to macOS 10.5.7 (aka Catalina) and built and ran with 3.3.1 that worked fine running in parallel. Cheers, Allen Allen Sanderson SCI Institute University of Utah _______________________________________________ discuss mailing list [email protected]<mailto:[email protected]> To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss -- A.K. & Shirley Barton Professor of Mathematics Adjunct Professor of Mechanical Engineering Adjunct of the Center for Computation & Technology Louisiana State University, Lockett Hall Room 344, Baton Rouge, LA 70803, USA Tel. +1 (225) 578 1612, Fax +1 (225) 578 4276 Web http://www.math.lsu.edu/~bourdin