The semantic of .NOPARALLEL has changed in GNU Make 4.4
Quote:
New feature: .NOTPARALLEL accepts prerequisites If the .NOTPARALLEL
special target has prerequisites then all prerequisites of those targets
will be run serially (as if .WAIT was specified between each
prerequisite).
This means that only prerequisites are made sequential. Before
everything within a Makefile would be done in sequential order.
Therefore, we had to add the *.hash target (appears multiple times) to
the .NOPARALLEL prerequisites.
issue #4725
