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