make: Remaking Loaded Objects
12.2.2 How Loaded Objects Are Remade
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Loaded objects undergo the same re-make procedure as makefiles (
How Makefiles Are Remade Remaking Makefiles.). If any loaded object is
recreated, then 'make' will start from scratch and re-read all the
makefiles, and reload the object files again. It is not necessary for
the loaded object to do anything special to support this.
It's up to the makefile author to provide the rules needed for
rebuilding the loaded object.