[petsc-dev] [petsc-users] PETSc and Windows 10

[Pierre Jolivet]

(moving to petsc-dev, feel free to continue the “general” discussion on petsc-users)

> On 29 Jun 2020, at 10:03 PM, Pierre Jolivet <pierre.jolivet at enseeiht.fr> wrote:
> 
> Sorry for the noise, but maybe it’s better to put this in PETSc ./configure, like you did here Satish https://gitlab.com/petsc/petsc/-/commit/2cd8068296b34e127f055bb32f556e3599f17523 <https://gitlab.com/petsc/petsc/-/commit/2cd8068296b34e127f055bb32f556e3599f17523> ?
> If Gfortran100 && MS-MPI, then FFLAGS += "-fallow-invalid-boz"
> WDY(PETSc-)GT?

So, it looks like -fallow-invalid-boz is not as old as I thought…
g++.exe (Rev1, Built by MSYS2 project) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Running Executable WITHOUT threads to time it out
Executing: gfortran -c -o /tmp/petsc-kmp34jh9/config.setCompilers/conftest.o -I/tmp/petsc-kmp34jh9/config.setCompilers -fallow-invalid-boz  /tmp/petsc-kmp34jh9/config.setCompilers/conftest.F90 
Possible ERROR while running compiler: exit code 1
stderr:
gfortran.exe: error: unrecognized command line option '-fallow-invalid-boz'
Source:
      program main

      end
          Error testing Fortran compiler: Cannot compile FC with gfortran.
            Deleting "FC"
Again, would it be OK if I add a check in MPI.py to force this option when isGfortran100plus and defined(HAVE_MSMPI)? Or do we expect Windows users to know about this ninja gfortran flag?
Is this tested on some Cygwin box (MS-MPI 10.1.2 + gfortran 10)?
I see arch-ci-mswin-intel.py is using MS-MPI (which version?) but with ifort.

Thanks,
Pierre
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