[cmake-developers] location tag substitution in external project BUILD_BYPRODUCTS

[Gaetan Lehmann]

Hi,

BUILD_BYPRODUCTS works very well with external projects and ninja :-)
I'd like to propose a small enhancement: replace the location tags like
<BINARY_DIR> by their real path in BUILD_BYPRODUCTS, in order to let the
developer specify the byproducts without explicitly setting the external
project binary dir.

See the attached patch.

Exposing _ep_replace_location_tags with a prettier name would also be nice.

An example using that feature:


https://github.com/glehmann/gtest-external/blob/byproduct-subst/gtest.cmake

Thanks,

Gaëtan
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