[CMake] external library dependencies

[James Bigler]

I have one project built by cmake where I write out the library  
configuration with EXPORT_LIBRARY_DEPENDENCIES.

I have another project where I include that file.  This works great  
for static building, because it handles all the transitive link  
properties.

One thing I noticed, however, is that if I change a library from the  
first project, running make in the second project doesn't produce a  
relink of dependent libraries.

Is there a mechanism to get CMake to recognize that the libraries  
have changed and to do dependency scanning?

I'm using cmake 2.4.7 on mac.

Thanks,
James

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