Hi, On Thu, Jun 30, 2022 at 9:40 AM Ralf Gommers <ralf.gomm...@gmail.com> wrote: > > > > On Thu, Jun 30, 2022 at 10:29 AM Matthew Brett <matthew.br...@gmail.com> > wrote: >> >> Hi, >> >> On Thu, Jun 30, 2022 at 12:42 AM Kevin Sheppard >> <kevin.k.shepp...@gmail.com> wrote: >> >> >> >> >> >> Hi, >> >> >> >> I am very sorry - I feel I should know this, or be able to work it >> >> out, but is there a way of setting the flags to the C compiler and the >> >> linker, for the Numpy build, on Windows? >> >> >> >> I'm trying to set the flags for a build with Windows mingw-w64 - but I >> >> believe Numpy is ignoring $env:LDFLAGS, $env:CFLAGS and $env:OPT - and >> >> I can't see any way of setting these options from the command line. >> >> Am I missing something? >> >> >> >> Cheers, >> >> >> >> Matthew >> >> >> Member address: kevin.k.shepp...@gmail.com >> > >> > >> > I think these are all hard coded and non-changable. This was the case >> > when I got NumPy building with clang-cl. >> >> That was my impression too, but I was delayed by the text at: >> >> https://numpy.org/doc/stable/user/building.html#supplying-additional-compiler-flags >> >> which says: >> >> """ >> Additional compiler flags can be supplied by setting the OPT, FOPT >> (for Fortran), and CC environment variables. When providing options >> that should improve the performance of the code ensure that you also >> set -DNDEBUG so that debugging code is not executed. >> """ >> >> I guess we should change that text to note these do not work on Windows. >> >> I think you can supply extra Fortran flags with the `config_gc` option >> to `setup.py`, but I don't think the others have any effect on >> Windows. >> >> I was also confused by these lines in `azure-steps-windows.yml`: >> >> """ >> $env:CFLAGS = "-m32" >> $env:LDFLAGS = "-m32" >> """ >> >> I assume these don't actually have any effect. > > > No, the above all seem wrong (unless there has been a major regression > recently), and the `-m32` flags work and are necessary. CFLAGS, FFLAGS, > CXXFLAGS and LDFLAGS can be used, and append compile flags. If you want to > remove flags that are already hardcoded in numpy.distutils, then that's a > different story - you need to edit the numpy.distutils source code then. > > I just stumbled on a Windows problem with `$env:`, and the problem was > Windows CI is hopelessly weird. It matters for example if you do something in > a Powershell context (`ps |` in a .yml file) or outside of it. So it may be > something like that.
Are you sure though - that you can append flags to the compile and link step with CFLAGS and LDFLAGS? It didn't work for me locally. And I can't see where they would have an effect, on Windows, in the code. Cheers, Matthew _______________________________________________ NumPy-Discussion mailing list -- numpy-discussion@python.org To unsubscribe send an email to numpy-discussion-le...@python.org https://mail.python.org/mailman3/lists/numpy-discussion.python.org/ Member address: arch...@mail-archive.com
