Nirbheek Chauhan authored Jan 17, 2020 and Tim-Philipp Müller committed Jul 20, 2020

It was using set() for holding dependencies, which does not have
a guaranteed order. Because of this, the order of libraries in the
linker lines were changing randomly, causing all the exes (1000 of
them, including tests) to be rebuilt even for no-op builds on
reconfigure.