Some background about the Slicer build system that inspired
the NamicExternalProjects system discussed by Kent ...
Before CMake 2.8.8, we disabled the UPDATE of external project
because it was not working well with Visual Studio. While this was
working as expected, the overall build time was also increased
because it wasn't doing an incremental rebuild.
The build time increased compared to what?
A second build, in a no update situation, should yield "no work to do"
because nothing got updated.
As of today, we re-enabled the UPDATE part of external project
and also require CMake >= 2.8.9 and it works quite well. The
overall build time is largely decreased.
Again, I don't understand how updating as part of the superbuild could
ever result in a decreased build time...
What am I missing here?
D
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