[CMake] Reexecute cmake to update build.make

[gga]

Mathieu Malaterre wrote:
> Example, your foo.i depends on bla.h. First time your configure,
> dependency will be right, for instance:
> 
> Makefile:
> ...
> foo_wrap.cpp: foo.i
> foo_wrap.cpp: bla.h
> <tab>swig -o foo_wrap.cpp foo.i
> 
> but now edit your foo.i file and add a new header file 'bar.h'. There
> is absolutely nothing in the Makefile that will say 'Hey rebuild
> foo_wrap.cpp, because it now depends on bar.h'
> 

Sure there is, even without those files I gave you.

foo.so depends on foo.obj
foo.obj depends on foo_wrap.cxx
foo_wrap.cxx depends on foo.i

when foo.i changes on disk (you added bar.h), foo_wrap.cxx gets
regenerated and recompiled.

What's missing by default in cmake is:

foo.i   depends on bla.h and other.i  (this is what swig -MF gives you)

so that whenever bla.h or other.i changes, so does foo.so.

With the files I gave you and a proper swig with dependencies (ie. swig
-MF), you should get that too.  Works beautifully.


-- 
Gonzalo Garramuño
ggarra at advancedsl.com.ar

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