linux-kernel - Re: [PATCH regression 4.0 -> 4.1] tools perf: Fix build breakage if prefix= is specified

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Date:	Fri, 19 Jun 2015 13:54:17 +0200
From:	Lukas Wunner <lukas@...ner.de>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH regression 4.0 -> 4.1] tools perf: Fix build breakage if
 prefix= is specified

Hi Jiri, Hi David,

On Fri, Jun 19, 2015 at 12:17:06AM +0200, Jiri Olsa wrote:
> it had effect.. prefix is passed to build framework throught .config-detected
> file as prefix_SQ variable, which is then referenced in perf Build makefiles

You're right, thanks for the clarification.

The underlying issue is basically that the same variable name is used for
two different things, to calculate the paths of the build targets in
Makefile.build and to pass the install directory around between Makefiles.
And which one "wins" depends on invocation. If we just rename the variable
in Makefile.build, the issue is gone. That's what the patch does.

Thanks again,

Lukas
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