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Date:   Tue, 22 Sep 2020 08:15:59 +0200 (CEST)
From:   Jan Engelhardt <jengelh@...i.de>
To:     Stephen Hemminger <stephen@...workplumber.org>
cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] build: avoid make jobserver warnings


On Tuesday 2020-09-22 02:19, Stephen Hemminger wrote:
>> I observe:
>> 
>> 	ยป make -j8 CCOPTS=-ggdb3
>> 	lib
>> 	make[1]: warning: -j8 forced in submake: resetting jobserver mode.
>> 	make[1]: Nothing to be done for 'all'.
>> 	ip
>> 	make[1]: warning: -j8 forced in submake: resetting jobserver mode.
>> 	    CC       ipntable.o
>> 
>> MFLAGS is a historic variable of some kind; removing it fixes the
>> jobserver issue.
>
>MFLAGS is a way to pass flags from original make into the sub-make.

MAKEFLAGS and MFLAGS are already exported by make (${MAKE} is magic
methinks), so they need no explicit passing. You can check this by
adding something like 'echo ${MAKEFLAGS}' to the lib/Makefile
libnetlink.a target and then invoking e.g. `make -r` from the
toplevel, and notice how -r shows up again in the submake.

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