[CMake] rebuild externalprojects

[Nils Gladitz]

On Thu, Sep 21, 2017 at 1:09 PM, J Decker <d3ck0r at gmail.com> wrote:

> how do I make sure that externalprojects get built if I change a source in
> one?
>

"BUILD_ALWAYS 1" should always trigger the build of the external project.
This would be required since only the external project's build system will
know if something relevant has changed or not.

Nils
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