[Cython] Improving compile times for Cython extensions with C sources

[Wes McKinney]

I haven't been able to find an easy answer to this question, but here is my
problem:

Cython file: extension.pyx
Declarations / C imports: extension.pxd
C dependencies:
a.c
b.c
c.c

These are all compiled together to produce extension.so.

The problem is, when I modify extension.pyx, all 4 C files are recompiled,
even if the 3 straight C files are untouched.

Any way to fix the build system to not do this? Seems that the .o files
from the C dependencies could be easily reused.

thanks,
Wes
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