[OE-core] python recipes with extensions fail to find/link with proper libraries

[Francesco Giancane]

Hi Everyone,
I found a problem working with python(3) and C extensions.

The use-case is the recipe for python(3)-numpy, which can be linked against
a BLAS/LAPACK library to use accelerated matricial and vectorial operations.

As it is currently shipped, the recipe fails to find any proper library and
then does not use extensions.

I wrote a custom recipe for openblas which is correctly built & deploy
using standard commands.
openblas is also added as a DEPENDS in a bbappend file for numpy.

However, the do_compile phase cannot find the aforementioned library.

Log attached:

DEBUG: Executing shell function do_compile
blas_opt_info:
blas_mkl_info:
customize UnixCCompiler
  libraries mkl_rt not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

blis_info:
customize UnixCCompiler
  libraries blis not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

openblas_info:
customize UnixCCompiler
customize UnixCCompiler
  libraries openblas not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

atlas_3_10_blas_threads_info:
Setting PTATLAS=ATLAS
customize UnixCCompiler
  libraries tatlas not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

atlas_3_10_blas_info:
customize UnixCCompiler
  libraries satlas not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

atlas_blas_threads_info:
Setting PTATLAS=ATLAS
customize UnixCCompiler
  libraries ptf77blas,ptcblas,atlas not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

atlas_blas_info:
customize UnixCCompiler
  libraries f77blas,cblas,atlas not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

blas_info:
customize UnixCCompiler
  libraries blas not found in
['/home/fgp/poky/rpi3_64/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/python3-numpy/1.14.2-r0/recipe-sysroot-native/usr/lib']
  NOT AVAILABLE

blas_src_info:
  NOT AVAILABLE

  NOT AVAILABLE

...And it is correct for it to fail as it is searching for openblas in the
wrong path (sysroot-native vs sysroot).

I would assume that this is a setuptools.bbclass issue, does anyone know
what to do? Is it trivial to fix?

I noticed that all the shipped python extensions were built as if we were
building for x86, even though the MACHINE is an arm target.

Thank you for your attention,

Francesco Giancane
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