linux-kernel - Re: [PATCH 48/52] tools/perf/build: Exclude MAKEFLAGS from nested invocation

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Date:	Thu, 10 Oct 2013 08:36:03 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 48/52] tools/perf/build: Exclude MAKEFLAGS from nested
 invocation


* Namhyung Kim <namhyung@...nel.org> wrote:

> On Tue,  8 Oct 2013 12:11:18 +0200, Ingo Molnar wrote:
> > In case the user specifies MAKEFLAGS as an environment variable,
> > or uses 'make -jN' explicitly, the options can conflict and result in:
> >
> >     BUILD: Doing 'make -j8' parallel build
> >     make[1]: warning: -jN forced in submake: disabling jobserver mode.
> >     GEN common-cmds.h
> >     make[1]: *** write jobserver: Bad file descriptor.  Stop.
> >
> > Make sure we invoke the main makefile in a pristine state.
> >
> > Users who want to do something non-standard can use the:
> >
> >   make -f Makefile.perf
> >
> > method to invoke the makefile.
> 
> Hmm... it'd be great if there's a way to detect -jN option and convert 
> it to the JOBS.

I looked hard but couldn't find any solution for that, GNU Make hides it. 
It seems to be possible on other Make platforms - so I suspect that will 
have to be a feature request to the GNU Make folks ...

Thanks,

	Ingo
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