[petsc-users] Cross compilation of PETSc using MXE

[Matthew Knepley]

On Fri, Jan 17, 2020 at 7:00 AM Lars Odsæter <lars.odsater at sintef.no> wrote:

> Dear PETSc users,
>
> First, thanks to the developers for your great effort with the PETSc
> library, which I have benefited from several times.
>
> I want to share with you that I recently was able to cross compile PETSc
> with the MXE (mxe.cc) cross compiler, and then link it into an application
> (also built with the mxe compiler) to produce an executable that I
> successfully ran on my Windows computer. In doing this I realized that
> there is very little documentation of this on the web, so maybe others
> could benefit from my approach. It contains a few hacks that might be
> solved more elegant, but that is probably out of may range.
>
> First, I installed the mxe cross compiler following the tutorial (
> mxe.cc/#tutorial):
>
> git clone https://github.com/mxe/mxe.git
> make cc
> make blas lapack
> export PATH=~/code/mxe/usr/bin:$PATH
>
> Then I compiled PETSc (3.11.3 tarball):
>
> wget
> http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-3.11.3.tar.gz
> gunzip -c petsc-3.11.3.tar.gz | tar -xof -
> cd petsc-3.11.3/
> ./configure PETSC_ARCH=arch-mxe-static \
>   --with-mpi=0 --host=i686-w64-mingw32.static \
>   --enable-static --disable-shared \
>   --with-cc=i686-w64-mingw32.static-gcc \
>   --with-cxx=i686-w64-mingw32.static-g++ \
>   --with-fc=i686-w64-mingw32.static-gfortran \
>   --with-ld=i686-w64-mingw32.static-ld \
>   --with-ar=i686-w64-mingw32.static-ar \
>   --with-pkg-config=i686-w64-mingw32.static-pkg-config \
>   --with-batch --known-64-bit-blas-indices
>
> Next, I did the reconfigure step that was explained in the output from the
> call to configure:
>
> * copy 'conftest-arch-mxe-static' to your Windows machine
> * Rename it with extension '.exe'
> * Run the application in Windows. This generates
> 'reconfigure-arch-mxe-static.py'
> * Copy 'reconfigure-arch-mxe-static.py' back to the Linux machine
> * Run the python script:
>
> python reconfigure-arch-mxe-static.py
>
> Now, 'make all' failed to compile, but I did two hacks to mitigate it:
>
> 1) In  '~/code/petsc-3.11.3/arch-mxe-static/include/petscconf.h' include
> the following lines:
> #ifndef PETSC_HAVE_DIRECT_H
> #define PETSC_HAVE_DIRECT_H 1
> #endif
>
> 2) In ~/code/petsc-3.11.3/src/sys/error/fp.c, comment out line 405-406:
> // elif defined PETSC_HAVE_XMMINTRIN_H
>
> // _MM_SET_EXCEPTION_MASK(_MM_MASK_INEXACT | _MM_MASK_UNDERFLOW);
>
> After this 'make all' ran successfully.
> I was finally able to compile my code (linking PETSc) following step 5 of
> the mxe tutorial: mxe.cc/#tutorial
> Then, simply copy to Windows and double-click.
>

Great! It sounds like we can make a couple of fixes that make this easier:

1) Name the batch executable .exe for this

2) Find direct.h correctly

3) Do not find xmmintrin.h

Can you send me your configure.log so I can see what went wrong on the
header location.

  Thanks,

     Matt


> Best regards,
>
> Lars Hov Odsæter
>
>

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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