meson/docs/markdown/snippets/extract-all-objects.md

Recursively extract objects

recursive keyword argument has been added to extract_all_objects. When set to true it will also return objects passed to the objects argument of this target. By default only objects built for this target are returned to maintain backward compatibility with previous versions. The default will eventually be changed to true in a future version.

lib1 = static_library('a', 'source.c', objects : 'prebuilt.o')
lib2 = static_library('b', objects : lib1.extract_all_objects(recursive : true))