EXCLUDE_FROM_ALL
Exclude the directory from the all target of its parent.
A property on a directory that indicates if its targets are excluded from the default build target. If it is not, then with a Makefile for example typing make will cause the targets to be built. The same concept applies to the default build of other generators.
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https://cmake.org/cmake/help/v3.9/prop_dir/EXCLUDE_FROM_ALL.html