[Numpy-discussion] OS X Lion: llvm: numpy and scipy

Ralf Gommers ralf.gommers at googlemail.com
Mon Sep 19 13:05:28 EDT 2011

On Mon, Sep 19, 2011 at 3:03 PM, Samuel John <scipy at samueljohn.de> wrote:

> Ahoy numpy gurus :-)
> Would it be possible to adapt the setup.py and/or numpy/distutils to set
> the right variables on Mac OS X 10.7? (see below).
> I have looked a bit into the setup.py and the distutils package of numpy
> but I am a bit lost.
> Do you think it's possible to teach numpy to use different CC, CXX?

This is possible, but numpy probably shouldn't mess with these variables. As
a user you can set them permanently by adding them to your bash_profile for

And the FFLAGS

This needs to be solved. Perhaps the solution involves more wrappers for
broken vecLib/Accelerate functions in scipy? Does anyone know which routines
are broken on 10.7? For 10.6 I found this discussion helpful:
http://www.macresearch.org/lapackblas-fortran-106. It is claimed there that
while '-ff2c' fixes complex routines, it breaks SDOT when used with '-m64'.
SDOT is used in linalg.

> and the switch --fcompiler=gnu95 arg?

This shouldn't be necessary if you only have gfortran installed.


> Building scipy on OS X Lion 10.7.x currently fails because of some llvm
> incompatibilies and the gfortran.
> While it's easy to get gfortran e.g. via http://mxcl.github.com/homebrew/it's hard to `pip install scipy` or manual install because you have to:
> > export CC=gcc-4.2
> > export CXX=g++-4.2
> > export FFLAGS=-ff2c
> > python setup.py build --fcompiler=gnu95
> This way, numpy and then scipy builds successfully.
> Scipy uses the distutil settings from numpy -- as far as I get it -- and
> therefore scipy cannot add these variables. Right?
> It would be great if numpy and scipy would build right out-of-the-box on OS
> X, again.
> I'd love to provide a patch but I am lost in the depth of distutils...
> Samuel
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