[Distutils] "pip wheel numpy" giving undefined reference errors

[Dan Stromberg]

On Wed, Mar 25, 2015 at 12:50 PM, Dan Stromberg <drsalists at gmail.com> wrote:
> Hi again.
>
> When I try to build a numpy wheel (using openblas statically, and
> libpython2.7 statically as well), I get a lot of errors like:
>
>   /tmp/pip-build-ZlPgN7/numpy/build/src.linux-x86_64-2.7/numpy/core/include/numpy/__multiarray_api.h:1642:
> undefined reference to `PyExc_AttributeError'
>   /tmp/pip-build-ZlPgN7/numpy/build/src.linux-x86_64-2.7/numpy/core/include/numpy/__multiarray_api.h:1642:
> undefined reference to `PyErr_SetString'
>   /tmp/pip-build-ZlPgN7/numpy/build/src.linux-x86_64-2.7/numpy/core/include/numpy/__multiarray_api.h:1642:
> undefined reference to `PyExc_ImportError'
>
> My first thought was "OK, I'll put -lpython2.7 in $LDFLAGS and export
> it", but that didn't appear to help.

I got past this by creating a drs-gcc and drs-gfortran shell wrappers,
that feed $LDFLAGS "$@" $LDFLAGS as command line arguments to gcc and
gfortran respectively.  I had to define $CC and $FC to make the
wrappers get used - before invoking pip wheel.  I also defined $F90 -
not sure if one or both of those fortran variables helped.

I've done a lot of software builds, but I've never had to resort to
that kind of trickery before.  Perhaps that's because most of my
builds were using dynamic libraries rather than static.