Windows 10, simple hello world program fails

[jeanlaroche]

Windows10, trying to compile with pythran:

#pythran export test()
def test():
    print("hey")

https://pastebin.com/EzRQJAAK

[serge-sans-paille]

This looks very similar to scikit-image/scikit-image#3226 (comment)

[jeanlaroche]

OK, I was able to fix the issue. The problem arises form the fact that by default, clang-cl.exe is the 32 bit version (or at least, was on my system). If I change my path so the default clang-cl.exe is the 64 bit version, compilation and linking run without any problem.
So, what works for my system:

• install clang the microsoft visual studio way, (there is an option to install clang when you install visual studio, and I believe that's the recommended way to install clang)
• Make sure your path is setup so clang-cl.exe is the 64 bit version of clang, not the 32 bit version.

I think this should probably be added to the documentation somewhere, right?

[serge-sans-paille]

@jeanlaroche I would be very happy if you updated the documentation, yes ;-)

[AndrewUshakov]

@serge-sans-paille I solved this issue by defining full path to clang-cl.exe in the file .pythranrc but had to use short legacy names to avoid spaces in the path:

[compiler]
CC=C:\PROGRA~2\MIB055~1\2019\BUILDT~1\VC\Tools\Llvm\x64\bin\clang-cl.exe
CXX=C:\PROGRA~2\MIB055~1\2019\BUILDT~1\VC\Tools\Llvm\x64\bin\clang-cl.exe

I tried to use both types of quotes for the usual long path, but generated call was not valid.

[serge-sans-paille]

@AndrewUshakov hell that's ugly :-) We should support quote there as we already did in 7fc75bb . I'll implement that.

[serge-sans-paille]

@AndrewUshakov on Linux, just the anme with spaces and no quotes works fine. Are you telling me that

[compiler]
CC=C:\Some Path\With Spaces

doesn't work?

[AndrewUshakov]

@serge-sans-paille If use quotes, output to console looks like:
E: error: Command "'C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\Llvm\x64\bin\clang-cl.exe' ... failed with exit status 127

Without quotes, all is Ok, Sorry. Probably I did something wrong yesterday.

[jeanlaroche]

@jeanlaroche I would be very happy if you updated the documentation, yes ;-)

Where in the doc should I add that? I tried to find mentions of windows in docs, but couldn't find anything. Simply in MANUAL.rst?

[jeanlaroche]

An update on this. With the latest version of pythran. On windows10, pythran uses clang-cl by default, which is good. But the linker it uses is still

Executing "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.28.29910\bin\HostX86\x64\link.exe"

which I don't think is right. I'm getting lots of linking errors as a result.
I don't know how to fix that as I can't specify the linker in the config file (or can I?)