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

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Date:	Wed, 18 Aug 2010 21:37:12 +0900
From:	Kusanagi Kouichi <slash@...auone-net.jp>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 2010-08-17 15:18:35 -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Aug 17, 2010 at 11:17:54AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Tue, Aug 17, 2010 at 11:08:40PM +0900, Kusanagi Kouichi escreveu:
> > > --- a/tools/perf/feature-tests.mak
> > > +++ b/tools/perf/feature-tests.mak
> > > @@ -113,7 +113,7 @@ endef
> > >  # try-cc
> > >  # Usage: option = $(call try-cc, source-to-build, cc-options)
> > >  try-cc = $(shell sh -c						  \
> > > -	'TMP="$(TMPOUT).$$$$";			 		  \
> > > +	'TMP="$(OUTPUT)$(TMPOUT).$$$$";				  \
> > >  	 echo "$(1)" |						  \
> > >  	 $(CC) -x c - $(2) -o "$$TMP" > /dev/null 2>&1 && echo y; \
> > >  	 rm -f "$$TMP"')
> > 
> > Much better! Will test and merge, thanks!
> 
> Still has issues:
> 
> [acme@...lia linux-2.6-tip]$ rm -rf ~/git/build/perf/
> [acme@...lia linux-2.6-tip]$ make O=~/git/build/perf -s -j9 -C tools/perf install
> PERF_VERSION = 2.6.36.rc1.2.g19bad
>     * new build flags or prefix
> [acme@...lia linux-2.6-tip]$ patch -p1 < Kouichi.patch 
> patching file tools/perf/Makefile
> patching file tools/perf/feature-tests.mak
> [acme@...lia linux-2.6-tip]$ rm -rf ~/git/build/perf/
> [acme@...lia linux-2.6-tip]$ make O=~/git/build/perf -s -j9 -C tools/perf install
> Makefile:503: No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev
> Makefile:534: *** No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static.  Stop.
> [acme@...lia linux-2.6-tip]$
> 
> Can you please investigate?
> 
> Thanks,
> 
> - Arnaldo

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
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