linux-kernel - Re: [PATCH] perf auto-dep: Speed up feature tests by building them in parallel

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Message-ID: <20131002101137.GB24445@gmail.com>
Date:	Wed, 2 Oct 2013 12:11:37 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	David Ahern <dsahern@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Namhyung Kim <namhyung@...il.com>
Subject: Re: [PATCH] perf auto-dep: Speed up feature tests by building them
 in parallel


* Jiri Olsa <jolsa@...hat.com> wrote:

> > @@ -388,7 +410,7 @@ else
> >            has_cplus_demangle := $(call try-cc,$(SOURCE_CPLUS_DEMANGLE),$(FLAGS_CPLUS_DEMANGLE),demangle)
> >            ifeq ($(has_cplus_demangle),y)
> >              EXTLIBS += -liberty
> > -            CFLAGS += -DHAVE_CPLUS_DEMANGLE
> > +            CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
> >            else
> >              msg := $(warning No bfd.h/libbfd found, install binutils-dev[el]/zlib-static to gain symbol demangling)
> >              CFLAGS += -DNO_DEMANGLE
> > @@ -400,30 +422,29 @@ else
> >  endif
> 
> Why not add tests for 
> has_bfd_iberty/has_bfd_iberty_z/has_cplus_demangle?

Yeah, did not get to that stage yet: I only converted the feature tests 
that trigger on my system (which is about 80% of them). Will complete the 
transition.

> We could remove the config/feature-tests.mak completely and other 
> cleanup like remove try-cc.

Yeah - that will be a nice simplification!

Thanks,

	Ingo
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