Issue ID: 9788
Summary: make warns about disabling/resetting jobserver
Target Milestone: ---
Running make -j8 issues the following warning for each directory with make 4.3:
make: warning: -j8 forced in submake: resetting jobserver mode.
with make 4.2.1:
make: warning: -jN forced in submake: disabling jobserver mode.
With make 3.82 there is no warning, but the jobserver flags are duplicated for
each nested directory. e.g.:
cd back-monitor && make -w --jobserver-fds=3,4 - --jobserver-fds=3,4 -
--jobserver-fds=3,4 - --jobserver-fds=3,4 -j all
On my env this is fixed by removing all the occurrences of $(MFLAGS) from
build/dir.mk. MFLAGS is picked up by make when it exists, and there is no need
to pass it explicitly.
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