[Numpy-discussion] scipy.scons branch: building numpy and scipy with scons

David Cournapeau david@ar.media.kyoto-u.ac...
Tue Dec 4 21:19:31 CST 2007

Robert Kern wrote:
> David Cournapeau wrote:
>>     - I have not yet tweaked fortran compiler configurations for 
>> optimizations except for gnu compilers
> Can you give us a brief overview about how to do this? For example, the Intel
> Fortran compiler's SHLINKFLAGS in scons-local/.../SCons/Tool/ifort.py are
> incorrect for version 10 on OS X. Would I copy that file to scons/tool/ and make
> my edits there? Do I then add 'ifort' to the list in scons/core/default.py?
The basic rule is: if the code cannot run without a flag, the flag 
should be put in a tool, or at worse (but really if you have no choice) 
in numpyenv.py. If the flag is optimization, warning, etc... then it 
should be put into default.py. Basically, tools are not always 
up-to-date in scons, perticularly for fortran. So I provided a way to 
override the tools: as you noticed, you can put tools in 
.../scons/tools/, those will be picked up first. This is independent 
from adding ifort in scons/core/default.py.

For Mac OS X, you may be bitten by  -undefined dynamic_lookup. This is 
my fault: this flag is added at the wrong place, I put it temporarily in 
the python extension builder, but this is not where it should be put. 
Depending on its meaning, I can put it at the right place: does it give 
the traditional unix semantic of enabling unresolved symbols instead of 
the default one, which is similar to windows (even for shared code, 
every symbol must be resolved) ?



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