[nrf fromlist] cmake: support directory as argument to zephyr_library… #2634
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…_amend().
Extend
zephyr_library_amend()to support an optional directory argument.The current
zephyr_library_amend()works well when used inside a Zephyr module with same structure, but fails when the macro is called from Zephyr module integration code is located in a ZephyrMODULE_EXT_ROOTbecause in this case the CMake code being executed is not present in the Zephyr module itself, in which case the dir name creation based on relative to module dir give wrong result.For this use-case then support a base directory.
This also allows for use-cases in Zephyr modules where the directory structure matching Zephyr's own structure is placed in a sub-folder.
Upstream PR#: 87274