error when building 'lightfm.lightfm_fast' extension on OSX about lightfm

[maciejkula]

Apparently that is a clang-only flag, it should not be given to gcc. Can you tell me what OSX version you are on and which Python distribution you are using?

[dustinstansbury]

Yosemite 10.10.3
Python 2.7.6

[maciejkula]

Can you paste the output of which python please?

[maciejkula]

I managed to reproduce your issue, it arises because you are building against the default OSX Python distribution. Installing Python from brew, macports, or the anaconda distribution should solve this problem while I look for a better solution.

[maciejkula]

Can you have a look if #30 fixes the issue for you?

[dustinstansbury]

That definitely fixed the error related to -Wshorten-64-to-32 flag, thank you.

However, I'm still getting some assembly errors. It's apparently related to this: http://stackoverflow.com/a/10894096.

Seems like a possible fix is to replace the flag -march=native with -mno-avx, or, to add the flags -Wa,-q

[maciejkula]

Yes, this manifests the same as #25 (though the root cause is different). I'll have a think.

[maciejkula]

I updated #30 to remove the -march=native flag. Can you confirm that it works for you?

[dustinstansbury]

Removing -march=native seems to have addressed the assembly errors. Will let you know if I run into anything else. Thank you for your time!

[dustinstansbury]

Hmm, looks like removing the native architecture flag compiles for the wrong architecture:

ImportError: dlopen(/Users/dustinstansbury/.virtualenvs/test/lib/python2.7/site-packages/lightfm/lightfm_fast.so, 2): no suitable image found.  
Did find: /Users/dustinstansbury/.virtualenvs/test/lib/python2.7/site-packages/lightfm/lightfm_fast.so: mach-o, but wrong architecture

[maciejkula]

I tried many things, but I think the soundest course of action here is to not support the default OSX Python installation. I'll update the readme to that effect.