netdev - Re: [PATCH iproute2] build: avoid make jobserver warnings

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Date:   Mon, 21 Sep 2020 17:19:07 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jan Engelhardt <jengelh@...i.de>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] build: avoid make jobserver warnings

On Tue, 22 Sep 2020 01:22:31 +0200
Jan Engelhardt <jengelh@...i.de> wrote:

> I observe:
> 
> 	» 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.
Not sure if it is used anywhere else.