linux-kernel - Re: [PATCH] perf tools: Fix build error on read only source.

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Message-ID: <1282135224.1926.3936.camel@laptop>
Date:	Wed, 18 Aug 2010 14:40:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kusanagi Kouichi <slash@...auone-net.jp>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Fix build error on read only source.

On Wed, 2010-08-18 at 21:37 +0900, Kusanagi Kouichi wrote:

> With POSIX shell patch, $(OUTPUT) has not been created yet when it is
> used by try-cc. This fixes the issue anyway.
> 
> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> index dcb9700..5b1c12b 100644
> --- a/tools/perf/Makefile
> +++ b/tools/perf/Makefile
> @@ -281,6 +281,7 @@ endif
> 
>  -include feature-tests.mak
> 
> +$(shell mkdir -p $(OUTPUT) 2> /dev/null)
>  ifeq ($(call try-cc,$(SOURCE_HELLO),-Werror -fstack-protector-all),y)
>  	CFLAGS := $(CFLAGS) -fstack-protector-all
>  endif


So you're wanting to provide a non-existing O=foo ?

I don't think we should, simply bail when it doesn't exist, kernel
builds do the same:

# make O=plop-build bzImage
/bin/sh: line 0: cd: plop-build: No such file or directory
Makefile:117: *** output directory "plop-build" does not exist.  Stop.

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