[oe] python-numpy prone to use host libraries

[Patrik Dahlström (student)]

I have been resolving issues regarding python-numpy this whole day and I would 
like to share my findings. python-numpy is a package required by opencv_2.2, 
which is a dependency of gst-plugins-bad making it essential to quite a lot of 
images.

First of all, python-numpy requires a fortran compiler and gcc-4.5 specifically 
disables the fortran language per default. From gcc-4.5.inc

# Language Overrides
FORTRAN = ""

I am unsure what the best approach is, but I resolved this by changing to
FORTRAN = ",fortran"

Looking at the compile log of python-numpy there were several instances of the 
following:

blas_info:
  libraries blas not found in 
/home/bitbake/build/tmp_beagleboard/sysroots/x86_64-linux/usr/lib
  libraries blas not found in /usr/local/lib64
  libraries blas not found in /usr/local/lib
  FOUND:
    libraries = ['blas']
    library_dirs = ['/usr/lib64']
    language = f77

  FOUND:
    libraries = ['blas']
    library_dirs = ['/usr/lib64']
    define_macros = [('NO_ATLAS_INFO', 1)]
    language = f77

It clearly tries to link against my host libraries and fails. My resort was 
simply to remove my host libraries (not needed at the moment). However, there 
are other ways to counter this problem.
Looking at the python-numpy sources, there is a file called site.cfg.example. 
In it, there is descriptions on how to supply python-numpy with configuration 
information about non-Python dependencies. It shouldn't be any problem 
generating site.cfg files for relevant parts of the python-numpy source.
I am however uncertain on how to proceed with this and could use some 
assistance.

-- 
MvH / with best regards
Patrik Dahlström
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