Build on Windows

[ocefpaf]

See Unidata/netcdf-fortran#48 (comment)

[pelson]

Maybe we can get some help from those in that issue? It would be time well spent for everybody's benefit.

[ocefpaf]

We are now using cmake on Linux and OS X. The issue with Windows is the Fortran compiler. I don't think we have a proper solution for Fortran on Windows yet.

Ping @gillins, @patricksnape, and @mingwandroid for your opinions and comments on the Fortran issue.

[mingwandroid]

IMHO conda install -c msys2 m2w64-toolchain is the current best solution for Fortran.

[ocefpaf]

IMHO conda install -c msys2 m2w64-toolchain is the current best solution for Fortran.

I will play with that. I believe that having msys2 in conda-forge will be very valuable. How difficult would that be?

[mingwandroid]

Not really difficult, it's just a question of time, something I've not got a lot of. Originally I was pushing for them to be part of defaults or rather, linked to defaults as a metachannel; actually they are in two places at present, msys2 and r!

The recipes are just unpack / repack scripts. They could be imported without much bother. Because of the rolling nature of MSYS2 there does need to be some centralized control so there's an msys2-conda-epoch package which manages dragging everything up to the correct contemporary versions.

I haven't managed to find time to tidy up my script that talks to pacman (pyalpm and libalpm really) and creates the recipes yet. It needs to be part of conda skeleton IMHO.

[ocefpaf]

Originally I was pushing for them to be part of defaults

👍

Can you point me to your recipes? I might give it a try...

[mingwandroid]

Sure, they are here:

https://github.com/conda/conda-recipes/tree/master/msys2

[MuellerSeb]

ping.

[MuellerSeb]

Is there any progress here? It would be really nice having windows support.

[beckermr]

looks like not. If you want to try it, please do! Simply fork the repo and make a PR. Lot's of people on this thread can help solve problems as they arise!

[jaimergp]

I am trying my best on #52 with the msys2 compilers. Apparently it's missing some symbols:

[ 35%] Linking Fortran executable tst_f77_v2.exe
../fortran/libnetcdff.a(nf_v2compat.c.obj):nf_v2compat.c:(.rdata$.refptr.ncerr[.refptr.ncerr]+0x0): undefined reference to `ncerr'
../fortran/libnetcdff.a(nf_v2compat.c.obj):nf_v2compat.c:(.rdata$.refptr.ncopts[.refptr.ncopts]+0x0): undefined reference to `ncopts'
collect2.exe: error: ld returned 1 exit status

This is the same issue observed in this other attempt. As in that case, our CMake does not find netcdf.h. Any ideas?

--

edit: If I enable CFLAGS/LDFLAGS, CMake finds netcdf.h but the ncerr error remains. Note that I can't specify any libraries on CFLAGS or the linker will fail during CMake:

set "LDFLAGS=-L%LIBRARY_PREFIX%/lib -Wl,-rpath,%LIBRARY_PREFIX%/lib"
:: Left out: `-lcurl -lhdf5 -lhdf5_hl -ldf -lmfhdf`
set "CFLAGS=-fPIC -I%LIBRARY_PREFIX%/include"

[MuellerSeb]

The referenced issue is marked for v1.5.3, and there is already a related pull request. Maybe this will work with the next release that is hopefully coming soon.

[MuellerSeb]

Maybe the new release helps:
https://github.com/Unidata/netcdf-fortran/releases/tag/v4.5.3

[jaimergp]

Thanks for the heads up! I'll wait until the regro PR is merged before integrating those changes.

[jaimergp]

Unfortunately the same error is still present on v4.5.3 :(

[MuellerSeb]

Some new hope:
Unidata/netcdf-fortran#268

[jaimergp]

It was merged, so now it's a matter of time until v4.5.4!

[MuellerSeb]

@jaimergp v4.5.4 is out 🎉

[xylar]

I'm building 4.5.4 without Windows first: #69. Feel free to follow up with a PR to add Windows.