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Date:	Mon, 16 Nov 2020 21:21:06 +0000 (UTC)
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID:	<2124807096.5977938.1605561666940@mail.yahoo.com>
Subject:	Open MPI broken (November 2 release) ?
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From:	Dennis Willen via Cygwin <cygwin AT cygwin DOT com>
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I tried re-compiling some things after updating to openmpi 4.0.5 and am getting some unexpected failures from mpifort and mpicc:
$ mpifort -O3 testmpi.f90/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lhwloc/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: cannot find -levent_core/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: cannot find -levent_pthreads/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lzcollect2: error: ld returned 1 exit status
Denny AT DESKTOP-BEBCMC4 ~/MPI_tests$
I have some working executables from October 26, so I assume there is a problem or something else that I need to update.  An example causing the above problem follows.  Running Cygwin on an Intel i9-9900K.  Thanks for your help.
Example:
program testmpi!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  MPI tests for Raspberry Pi cluster.!!  - Hello World!  - Broadcast and reduce!  - Pass along real array!  -!  -!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!implicit noneinclude 'mpif.h'integer:: myproc, numproc, ierr, len, istatus(mpi_status_size)character(mpi_max_processor_name):: hostnameinteger:: nreal*4:: y, z, x(1024)!!  Hello world.!call mpi_init(ierr)call mpi_comm_rank(mpi_comm_world, myproc, ierr)call mpi_comm_size(mpi_comm_world, numproc, ierr)call mpi_get_processor_name(hostname, len, ierr)write(6,'(i5,a19,a6)') myproc, ': Hello world from ', hostnamecall mpi_barrier(mpi_comm_world,ierr)!!  Broadcast and reduce.!y = 0.0z = 0.0if(myproc.eq.0) y = 1.0call mpi_bcast(y, 1, mpi_real, 0, mpi_comm_world, ierr)call mpi_reduce(y, z, 1, mpi_real, mpi_sum, 0, mpi_comm_world,  &                ierr)if(myproc.eq.0) write(6,*) numproc, ' should be ', zcall mpi_barrier(mpi_comm_world,ierr)!!  Up the chain and back to the start.!if(myproc==0) then  do n=1, 1024    x(n) = float(n)    enddoelse  do n=1, 1024    x(n) = -float(n)    enddo  call mpi_recv(x, 1024, mpi_real, myproc-1, mpi_any_tag,  &                mpi_comm_world, istatus, ierr)  endifif(myproc<numproc-1) call mpi_send(x, 1024, mpi_real,  &                      myproc+1, 1, mpi_comm_world, ierr)if(myproc==numproc-1) call mpi_send(x, 1024, mpi_real,  &                             0, 1, mpi_comm_world, ierr)x(1:1024) = 0.0if(myproc==0) then  call mpi_recv(x, 1024, mpi_real, numproc-1, mpi_any_tag,  &                               mpi_comm_world, istatus, ierr)  write(6,'(f8.2,a11,f8.2)') x(1024), ' should be ', float(1024)  endifcall mpi_barrier(mpi_comm_world,ierr)!!  Finished.!call mpi_finalize(ierr)stopend
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