[SciPy-Dev] OSX build failing at gfortran link

[Ralf Gommers]

On Thu, Oct 14, 2010 at 8:50 PM, Ralf Gommers
<ralf.gommers at googlemail.com> wrote:
>
>
> On Tue, Oct 12, 2010 at 10:58 PM, Ralf Gommers <ralf.gommers at googlemail.com>
> wrote:
>>
>> Hi Matthew,
>>
>> On Tue, Oct 12, 2010 at 7:33 AM, Matthew Brett <matthew.brett at gmail.com>
>> wrote:
>>>
>>> Hi Ralf,
>>>
>>> >> Looking at numpy/distutils/fcompiler/gnu.py, I see that the function
>>> >> ``_can_target`` cycles through the arch flags seeing whether they (on
>>> >> their own) raise an error when compiling an empty .f file.    I guess
>>> >> the problem here is that, although gfortran will compile a file with
>>> >> '-arch x86_64' - it can't link a python extension with '-arch x86_64'.
>>> >>  Would it make any sense to get the -arch flags somehow from the
>>> >> default C linking flags?  Is that sensible?  Is it easy?
>>> >
>>> > I think it makes sense but I'm not sure it's easy. I'll try to figure
>>> > that
>>> > out before 1.5.1rc1, if it's not easy then the patch from #1399 should
>>> > just
>>> > be reverted. Mea culpa again for causing this problem.
>>>
>>> I had a go - always unpleasant with distutils.  I think this works:
>>>
>>>
>>> http://github.com/matthew-brett/numpy/compare/numpy:master...farchs-from-c
>>>
>>> At least the standard 'CXX=/usr/bin/g++-4.0 python setup.py install'
>>> routine gave a working scipy passing all tests.
>>>
>>> Does it look OK to you?  If so I'll submit a pull request to numpy.
>>>
>> Thanks for diving in! That works for me, and looks like the right thing to
>> do. The methods you removed are clearly marked as private in the base class
>> and not used anywhere else as far as I can tell, but it would be good to get
>> a confirmation from someone familiar with the history / use cases of
>> fcompiler that this is fine.
>
> David W.F. tested on two non-standard Python installs, all good:
> http://projects.scipy.org/numpy/ticket/1399#comment:8. So time to apply your
> fix I think.
>
Committed now, and http://projects.scipy.org/numpy/ticket/1399 closed.
Thanks again Matthew!

Cheers,
Ralf