Question regarding python, _sysconfigdata.py, and building C extension modules on the target...

Question regarding python, _sysconfigdata.py, and building C extension modules on the target...

[Bob Cochran]

Hi,

While building a python 2.7 C extension module on the target (e.g., 
python setup.py build) I found that I needed to modify 
/usr/lib64/python2.7/_sysconfigdata.py to successfully build the module.

I modified both CC and LDSHARE.  For both, I removed 
--sysroot=/build/yocto/<project>/tmp/sysroots/<machine>'.  And for 
LDSHARE, I added -L/lib64, so gcc_s could be found.

I'm wondering whether this is expected behavior or perhaps a bug. 
Perhaps I should have setup my environment differently for building a C 
extension module on the target?

I would appreciate any advice on the best way to rectify this so I can 
use a non-modified, generated rootfs to build C extension modules on my 
target.

I'm using poky fido (508c4cac320d) and building with a Freescale t1040 
64bit (meta-fsl-ppc).

Thanks

Bob

Re: Question regarding python, _sysconfigdata.py, and building C extension modules on the target...

[Bob Cochran]

On 06/01/2015 10:47 PM, Bob Cochran wrote:
> Hi,
>
> While building a python 2.7 C extension module on the target (e.g.,
> python setup.py build) I found that I needed to modify
> /usr/lib64/python2.7/_sysconfigdata.py to successfully build the module.
>
> I modified both CC and LDSHARE.  For both, I removed
> --sysroot=/build/yocto/<project>/tmp/sysroots/<machine>'.  And for
> LDSHARE, I added -L/lib64, so gcc_s could be found.
>
> I'm wondering whether this is expected behavior or perhaps a bug.
> Perhaps I should have setup my environment differently for building a C
> extension module on the target?
>
> I would appreciate any advice on the best way to rectify this so I can
> use a non-modified, generated rootfs to build C extension modules on my
> target.

For now, I modified my setup.py to include the following in my call to 
Extension():

                     include_dirs=['/usr/include'],
                     library_dirs=['/lib64'])

However, I don't think I should need to do this, and I didn't have to do 
this on targets (rootfs) generated by earlier poky releases.  I'll keep 
digging...


>
> I'm using poky fido (508c4cac320d) and building with a Freescale t1040
> 64bit (meta-fsl-ppc).
>
> Thanks
>
> Bob