linux-kernel - Re: [PATCH] perf: fix 'make help' message error

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Date:	Thu, 29 May 2014 16:04:24 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Jianyu Zhan <nasa4836@...il.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: fix 'make help' message error

Hi Jianyu,

On Sun, 25 May 2014 12:50:49 +0800, Jianyu Zhan wrote:
> Currently 'make help' message has such hint:
>
>    use "make prefix=<path> <install target>" to install to a particular
>        path like make prefix=/usr/local install install-doc
>
> But this is misleading, when I specify "prefix=/usr/local", it has got no
> respect at all. Instead, what takes effect is the "DESTDIR" variable.
> In this case, "DESTDIR" has a empty value, so the actual install
> directory falls back $HOME, not '/usr/local'.
>
> Specifying "DESTDIR=/usr/local" will work as desired.
>
> This patch fixes the help message.

I don't know what's the correct way to do this.  But it seems like the
prefix was overwritten when given from user, so below patch will work
also.

Thanks,
Namhyung


diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 729bbdf5cec7..80a8a0a1c7e7 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -599,7 +599,7 @@ endif
 
 # Make the path relative to DESTDIR, not to prefix
 ifndef DESTDIR
-prefix = $(HOME)
+prefix ?= $(HOME)
 endif
 bindir_relative = bin
 bindir = $(prefix)/$(bindir_relative)
--
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