linux-kernel - Re: [PATCH 05/21] perf: rewire generic library stuff, p1

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Date:	Thu, 1 Jul 2010 23:37:06 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/21] perf: rewire generic library stuff, p1

From: Arnaldo Carvalho de Melo <acme@...radead.org>
Date: Thu, Jul 01, 2010 at 05:13:31PM -0400

> Em Thu, Jul 01, 2010 at 10:14:18PM +0200, Borislav Petkov escreveu:
> > From: Arnaldo Carvalho de Melo <acme@...radead.org>
> > Date: Thu, Jul 01, 2010 at 01:14:49PM -0400
> > > But we have one other problem:
> 
> > > [acme@...lia linux-2.6-tip]$ make O=~/git/build/perf -C tools/
> > > make: Entering directory `/home/acme/git/linux-2.6-tip/tools'
> > > make[1]: Entering directory `/home/acme/git/linux-2.6-tip/tools/lib'
> > > make[1]: `lklib.a' is up to date.
> > > make[1]: Leaving directory `/home/acme/git/linux-2.6-tip/tools/lib'
> > > make[1]: Entering directory `/home/acme/git/linux-2.6-tip/tools/perf'
> > >     GEN perf-archive
> > > make[1]: Leaving directory `/home/acme/git/linux-2.6-tip/tools/perf'
> > > make: Leaving directory `/home/acme/git/linux-2.6-tip/tools'
> > > [acme@...lia linux-2.6-tip]$ make O=~/git/build/perf -C tools/perf/
> > > make: Entering directory `/home/acme/git/linux-2.6-tip/tools/perf'
> > >     * new build flags or prefix
> > >     CC /home/acme/git/build/perf/perf.o
> > >     CC /home/acme/git/build/perf/builtin-annotate.o
> > > 
> > > The logic that detects "new build flags or prefix" gets confused when we
> > > alternate between tools/ and tools/perf/, checking that.
> > 
> > This might need an up-to-date check for the lklib.a archive first and
> > not do "new build flags or prefix" if it is. Yeah, this is a different
> > library and the logic doesn't know about it.
> 
> I got sidetracked, but this is what is in $(O)/PERF-CFLAGS for
> make -C tools/
> 
> [acme@...lia linux-2.6-tip]$ cat ../build/perf/PERF-CFLAGS 
> -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Wformat-y2k -Wshadow -Winit-self -Wpacked -Wredundant-decls -Wstack-protector -Wstrict-aliasing=3 -Wswitch-default -Wswitch-enum -Wno-system-headers -Wundef -Wvolatile-register-var -Wwrite-strings -Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wstrict-prototypes -Wdeclaration-after-statement  -fstack-protector-all -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/home/acme/git/linux-2.6-tip/tools/lib -I/home/acme/git/linux-2.6-tip/tools/perf -I/home/acme/git/linux-2.6-tip/tools/perf/util/include -Iutil/include -Iarch/x86/include -I../lib/ -I/home/acme/git/build/perf/ -DLIBELF_NO_MMAP -I/usr/include/elfutils -DDWARF_SUPPORT -I/usr/include/slang -DSHA1_HEADER='<openssl/sha.h>' : /home/acme/bin:libexec/perf-core:share/perf-core/templates:/home/acme
> [acme@...lia linux-2.6-tip]$
> 
> And this is its contents if we use "make -C tools/perf/"
> 
> -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2   -fstack-protector-all -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Iutil/include -Iarch/x86/include -I../lib/ -I/home/acme/git/build/perf/ -DLIBELF_NO_MMAP -I/usr/include/elfutils -DDWARF_SUPPORT -I/usr/include/slang -DSHA1_HEADER='<openssl/sha.h>' : /home/acme/bin:libexec/perf-core:share/perf-core/templates:/home/acme
> 
> Its just a matter of making both match :-)

Oh yeah, I see the difference. The second one is missing all the -Wxxx
settings and the BASIS_CFLAGS with all the include paths which get
computed in the top Makefile and exported to the Makefiles in the
subdirectories. Hmm, maybe we should reroute the "make -C tools/perf/"
invocation to go up one dir and execute the top-Makefile after all...

I'll look into it soon, I'm almost falling asleep now :)

Good night.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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