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SubjectRe: [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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