tools/manifestfile.py: Change library search to use a list of paths. #13620
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This PR changes how library packages are searched for when a manifest file is loaded: there is now simply a list of library paths that is searched in order for the given package. This list defaults to the main directories in micropython-lib, but can be added to -- either appended or prepended -- by using
add_library()
.In particular the way unix-ffi library packages are searched has changed, because the
unix_ffi
argument torequire()
is now removed. Instead, if a build wants to include packages from micropython-lib/unix-ffi, then it must explicitly add this to the list of paths to search using:Work done in collaboration with Jim Mussared.