linux-kernel - Re: [PATCH 32/52] tools/perf/build: Speed up auto-detection of features by adding a 'test-all' target

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Date:	Thu, 10 Oct 2013 09:24:13 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 32/52] tools/perf/build: Speed up auto-detection of
 features by adding a 'test-all' target


* Namhyung Kim <namhyung@...nel.org> wrote:

> On Tue,  8 Oct 2013 12:11:02 +0200, Ingo Molnar wrote:
> > +test-all:
> > +	$(BUILD) -Werror -fstack-protector -Wvolatile-register-var -O2 
> > -Werror -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lunwind -lunwind-x86_64 
> > -lelf -laudit -I/usr/include/slang -lslang $(shell pkg-config --libs 
> > --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) 
> > $(FLAGS_PYTHON_EMBED) -DPACKAGE='perf' -DPACKAGE=perf -lbfd -ldl
> 
> Also missed -Wstack-protector.  And duplicate -Werror.
> 
> Anyway, it'd be great to generate this flags as well as source file 
> automatically.

Well, the source file would mean some extra construction overhead during 
detection - but generating the flags ought to be possible, by putting the 
test-all entry last and generating a rolling ALL_FLAGS variable via the 
rules above it.

Would you like to write such a patch?

Thanks,

	Ingo
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