[CMake] ExternalProject: avoiding rebuilds

[Rolf Eike Beer]

Am Freitag, 23. September 2011, 16:26:46 schrieb Ben Medina:
> Hello all,
> 
> I'm trying to adopt greater usage of ExternalProject in my project.
> One problem I'd like to resolve is spurious rebuilds of external
> projects.

[...]

> This works great: building "test" first untars the CLAPACK source and
> builds it, as expected. However, if I rebuild test (i.e. in Visual
> Studio, right-click on test and rebuild), then the CLAPACK tarball get
> extracted *again*, and a full rebuild of CLAPACK happens. I'd expect
> that, unless the tarball is changed, a rebuild of the external project
> is a no-op.
> 
> Is there a way to achieve my desired behavior?

Yes, use the correct option. Rebuild means "rebuild this target and all of 
it's dependencies". There is a different option, something like "rebuild only 
this target". Just use this one.

Eike
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