[Numpy-discussion] Build numpy without support of "long double' on OS-X

Robert Kern robert.kern at gmail.com
Fri Jan 26 15:40:16 EST 2007

Sebastian Haase wrote:
> On 1/26/07, Robert Kern <robert.kern at gmail.com> wrote:
>> Sebastian Haase wrote:
>>> The easiest would be to be able to disable the long double functions.
>> Actually, there are a number of other configuration items that are discovered by
>> compiling small C programs and running them. There are a number of them that
>> might give different answers on 10.3.9 if they could be compiled there. You
>> would have to replace that configuration system with something that could load
>> the configuration from a file or some other source.
>> Since that's a big project, you might be content with modifying the code to
>> hard-code the results for your own builds and documenting the differences from
>> the result of a build from official sources.
> I have to admit that I don't know what "configuration items" are -

It's a general term, not a specific technical one. Look in the function
generate_config_h() in numpy/core/setup.py (it's inside the function
configuration()). All of the calls to config_cmd.try_run() and
config_cmd.check_func() are constructing small C programs, building them, and
trying to run them to see if they work.

There may be others scattered around, but I don't think so.

> but I can report that the simple approach of copying libmx.A.dyso
> from a 10.4 system to a directory which I added to DYLD_LIBRARY_PATH
> seems to work
> on the 10.3.9 PPC machine for the first tests I ran so far.

AFAIK, you can't redistribute that file legally.

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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