modified meta.yaml for Windows build using msys2

[tjwilli58]

Checklist

• Used a fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (@conda-forge-admin, please rerender)
• Ensured the license file is being packaged.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-webservice.

I tried to re-render for you, but it looks like there was nothing to do.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[scopatz]

Thanks for putting this in @tjwilli58. This doesn't have a build.bat script and so it just builds an empty package, which I think is confusing for anyone wanting to use the package on windows.

[tjwilli58]

@scopatz , I was thinking that bld.bat was optional, that's why I didn't add it. I misread that paragraph and didn't think I needed it. I'll add it tonight
Thanks.

[tjwilli58]

Ok, so I copy the default bld.bat to the recipe folder, but when I try to build it I get an error at the end:

C:\Users\Tim\Miniconda3\conda-bld\glib_1534209126702\_h_env\python.exe: can't open file 'setup.py': [Errno 2] No such file or directory
Traceback (most recent call last):
  File "C:\Users\Tim\Miniconda3\Scripts\conda-build-script.py", line 10, in <module>
    sys.exit(main())
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\cli\main_build.py", line 420, in main
    execute(sys.argv[1:])
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\cli\main_build.py", line 411, in execute
    verify=args.verify)
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\api.py", line 200, in build
    notest=notest, need_source_download=need_source_download, variants=variants)
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\build.py", line 2177, in build_tree
    notest=notest,
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\build.py", line 1385, in build
    windows.build(m, build_file, stats=build_stats)
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\windows.py", line 297, in build
    check_call_env(cmd, cwd=src_dir, stats=stats)
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\utils.py", line 310, in check_call_env
    return _func_defaulting_env_to_os_environ('call', *popenargs, **kwargs)
  File "C:\Users\Tim\Miniconda3\lib\site-packages\conda_build\utils.py", line 290, in _func_defaulting_env_to_os_environ
    raise subprocess.CalledProcessError(proc.returncode, _args)
subprocess.CalledProcessError: Command '['cmd.exe', '/c', 'bld.bat']' returned non-zero exit status 1.

So what's the correct way to do this? Not having a bld.bat, I have a package in Miniconda3\conda-bld\win-64

[pkgw]

@tjwilli58 From what you paste, I think the default file is only going to work for a pure-Python package. For glib, the process is going to be more demanding. Have you been consulting this documentation? Based on a very quick scan of that, I'd suggest you use the meson-based approach, but for the "autoconfiscated" approach you could try emulating the approach taken for the X.org libraries, which is quite tedious; the three files here give an example of the hoops that one needs to jump through.

[tjwilli58]

Thanks for the link @pkgw . No, I haven't seen this documentation. It should help me get up to speed on understanding building packages. What I'd like to do is build these packages w/o MSVC, so I'm trying to go the MSYS2 route. As you already know, building glib, gobject-introspection is just preparation for building pygobject. (And that's because my goal is to have gstreamer and all gst-plugins available in miniconda.) The setup.py file for pygobject does not support msvc compiler. The package is available in MSYS2 though.

def filter_compiler_arguments(compiler, args):
    """Given a compiler instance and a list of compiler warning flags
    returns the list of supported flags.
    """

    if compiler.compiler_type == "msvc":
        # TODO
        return []

    extra = []

        def build_ext(ext):
            if compiler.compiler_type == "msvc":
                raise Exception("MSVC support not implemented")

[tjwilli58]

Closing this pull request until I figure things out.