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Dear PETSc users,</div>
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First, thanks to the developers for your great effort with the PETSc library, which I have benefited from several times. </div>
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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.</div>
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First, I installed the mxe cross compiler following the tutorial (<a href="https://mxe.cc/#tutorial">mxe.cc/#tutorial</a>):</div>
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<span>git clone https://github.com/mxe/mxe.git<br>
</span>
<div>make cc<br>
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<span>make blas lapack</span><br>
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<span>export PATH=~/code/mxe/usr/bin:$PATH<br>
</span></div>
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<span>Then I compiled PETSc (3.11.3 tarball):</span></div>
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<span><span>wget http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-3.11.3.tar.gz<br>
</span>
<div>gunzip -c petsc-3.11.3.tar.gz | tar -xof -<br>
</div>
<div>cd petsc-3.11.3/<br>
</div>
<div>./configure PETSC_ARCH=arch-mxe-static \<br>
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<div> --with-mpi=0 --host=i686-w64-mingw32.static \<br>
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<div> --enable-static --disable-shared \<br>
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<div> --with-cc=i686-w64-mingw32.static-gcc \<br>
</div>
<div> --with-cxx=i686-w64-mingw32.static-g++ \<br>
</div>
<div> --with-fc=i686-w64-mingw32.static-gfortran \<br>
</div>
<div> --with-ld=i686-w64-mingw32.static-ld \<br>
</div>
<div> --with-ar=i686-w64-mingw32.static-ar \<br>
</div>
<div> --with-pkg-config=i686-w64-mingw32.static-pkg-config \<br>
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<span> --with-batch --known-64-bit-blas-indices</span><br>
</span></div>
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<span><span>Next, I did the reconfigure step that was explained in the output from the call to configure:</span></span></div>
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<span><span><span>* copy 'conftest-arch-mxe-static' to your Windows machine<br>
</span>
<div>* Rename it with extension '.exe'<br>
</div>
<div>* Run the application in Windows. This generates 'reconfigure-arch-mxe-static.py'<br>
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<div>* Copy 'reconfigure-arch-mxe-static.py' back to the Linux machine<br>
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<div>* Run the python script:<br>
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<div><br>
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<span>python reconfigure-arch-mxe-static.py</span><br>
</span></span></div>
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<span><span>Now, 'make all' failed to compile, but I did two hacks to mitigate it:</span></span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;">1) In '<span>~/code/petsc-3.11.3/arch-mxe-static/include/petscconf.h' include the following lines:<br>
</span>
<div>#ifndef PETSC_HAVE_DIRECT_H<br>
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<div>#define PETSC_HAVE_DIRECT_H 1<br>
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<span>#endif</span></span><br>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;"><span>2) <span>In ~/code/petsc-3.11.3/src/sys/error/fp.c, comment out line 405-406:<br>
</span>
<div>// elif defined PETSC_HAVE_XMMINTRIN_H
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<span>// _MM_SET_EXCEPTION_MASK(_MM_MASK_INEXACT | _MM_MASK_UNDERFLOW);</span></span></span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;"><span><span><br>
</span></span></span></div>
<div style=""><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif"><span style="font-size: 12pt;">After this 'make all' ran
</span>successfully<span style="font-size: 12pt;">. </span></font></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;"><span><span>I was finally able to compile my code (linking PETSc) following step 5 of the mxe tutorial: <a href="https://mxe.cc/#tutorial" style="margin: 0px; font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)" id="LPlnk967654">mxe.cc/#tutorial</a></span></span></span></div>
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Then, simply copy to Windows and double-click.</div>
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Best regards,</div>
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Lars Hov Odsæter</div>
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