linux-kernel - Re: [PATCH 05/27] perf tools: Move compiler and linker flags check into config/Makefile

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Date:	Tue, 2 Apr 2013 01:06:27 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/27] perf tools: Move compiler and linker flags check
 into config/Makefile

On Tue, Apr 02, 2013 at 07:20:25AM +0900, Namhyung Kim wrote:
> 2013-04-01 (월), 21:18 +0200, Jiri Olsa:
> > Moving compiler and linker flags check into config/Makefile.
> 
> [SNIP]
> 
> > diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> > index 8dd3320..dcae71b 100644
> > --- a/tools/perf/Makefile
> > +++ b/tools/perf/Makefile
> > @@ -52,6 +52,20 @@ include config/utilities.mak
> >  #
> >  # Define NO_LIBNUMA if you do not want numa perf benchmark
> >  
> > +ifeq ($(srctree),)
> > +srctree := $(patsubst %/,%,$(dir $(shell pwd)))
> > +srctree := $(patsubst %/,%,$(dir $(srctree)))
> > +#$(info Determined 'srctree' to be $(srctree))
> > +endif
> > +
> > +ifneq ($(objtree),)
> > +#$(info Determined 'objtree' to be $(objtree))
> > +endif
> > +
> > +ifneq ($(OUTPUT),)
> > +#$(info Determined 'OUTPUT' to be $(OUTPUT))
> > +endif
> > +
> 
> Question, what's the difference between objtree and OUTPUT?

check top stuff at 'tools/scripts/Makefile.include'

OUTPUT ties with $(subdir), while objtree is pure $(O)

I didn't use the 'tools/scripts/Makefile.include' include
the Makefile.kbuild, just defined OUTPUT variable

The Makefile.kbuild processing is allways based on git tree root,
and all binaries are prefixed $(objtree) or $(obj-perf) and all
source code is prefixed with $(srctree) or $(src-perf)

> 
> 
> > +ifndef PERF_DEBUG
> > +	CFLAGS_OPTIMIZE = -O6
> > +endif
> 
> Is this -O6 really supported by gcc?

hmm, no doc.. and quick google found just your question ;)

> 
> > +
> > +ifdef PARSER_DEBUG
> > +	PARSER_DEBUG_BISON  := -t
> > +	PARSER_DEBUG_FLEX   := -d
> > +	PARSER_DEBUG_CFLAGS := -DPARSER_DEBUG
> > +endif
> > +
> > +CFLAGS = -fno-omit-frame-pointer -ggdb3 -funwind-tables -Wall -Wextra -std=gnu99 $(CFLAGS_WERROR) $(CFLAGS_OPTIMIZE) $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) $(PARSER_DEBUG_CFLAGS)
> 
> Please break this line into multiple CFLAGS += ... lines as Sam said.
> 

ok

SNIP

> > +
> > +BASIC_CFLAGS = \
> > +	-Iutil/include \
> > +	-Iarch/$(ARCH)/include \
> > +	$(if $(objtree),-I$(objtree)/arch/$(ARCH)/include/generated/uapi) \
> > +	-I$(srctree)/arch/$(ARCH)/include/uapi \
> > +	-I$(srctree)/arch/$(ARCH)/include \
> > +	$(if $(objtree),-I$(objtree)/include/generated/uapi) \
> > +	-I$(srctree)/include/uapi \
> > +	-I$(srctree)/include \
> > +	-I$(OUTPUT)util \
> > +	-Iutil \
> > +	-I. \
> > +	-I$(TRACE_EVENT_DIR) \
> > +	-I../lib/ \mktemp
> > +	-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
> 
> And this too.  Btw do we really need this many include directories?
> 
ok, I tried to sort it out in another patch:
    perf tools: Switch to full patch C include directories

thanks,
jirka
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