problem building python 3.5 extensions for windows

[cjgohlke at gmail.com]

On Tuesday, September 22, 2015 at 1:49:16 PM UTC-7, Terry Reedy wrote:
> On 9/22/2015 9:35 AM, Robin Becker wrote:
> > On 22/09/2015 11:14, Robin Becker wrote:
> >> On 22/09/2015 01:36, CG wrote:
> > .........t
> >>> <http://bugs.python.org/issue24872#msg249589>.
> >>>
> >> Thanks for the pointer Christoph.
> >>
> >> I certainly didn't let it run for 30 minutes. When I build with 2.7,
> >> 3.3 or 3.4
> >> the whole build including reportlab stuff is over in a couple of
> >> minutes. I will
> >> try again, but a linker that takes 30 minutes to create an extension
> >> that ends
> >> up 204Kb long has to be seriously broken. Is it trying to hard? Most
> >> of the code
> >> size is in arrays for code points etc etc.
> >
> > I timed my builds of pyRXPU for x86 + amd64; these are on a core i5-3470
> > @ 3.20Ghz with 4Gb memory.
> >
> > python 3.4   1 minute  14 seconds
> > python 3.5  52 minutes 50 seconds
> >
> > so with VS2015 it will now take me an hour to make and test any changes
> > to this extension. I don't see how the issue can be considered closed.
> > VS2015 is clearly not the way forward for any reasonable development
> > process.
> 
> I think you should add the above to the issue.
> 
> -- 
> Terry Jan Reedy

It's a compiler bug. To work around, disable compiler optimizations, i.e. set `extra_compile_args=['/Od']` in setup.py.

--
Christoph