linux-kernel - Re: [tip:perfcounters/core] perf_counter tools: Build with native optimization

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Date:	Fri, 5 Jun 2009 20:42:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	mingo@...hat.com, hpa@...or.com, acme@...hat.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	efault@....de, mtosatti@...hat.com, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com
Subject: Re: [tip:perfcounters/core] perf_counter tools: Build with native
	optimization


* Paul Mackerras <paulus@...ba.org> wrote:

> tip-bot for Ingo Molnar writes:
> 
> > perf_counter tools: Build with native optimization
> > 
> > Build the tools with -march=native by default.
> 
> On powerpc (RHEL5.2 on POWER5+, gcc 4.1.2), I get:
> 
>     CC perf.o
> cc1: error: unrecognized command line option "-march=native"
> make: *** [perf.o] Error 1

ok, i removed that.

> Is there a way to make the default CFLAGS depend on the architecture?
> We need -m64 on powerpc as well.

Would be nice to add a Makefile rule to add -m64 on all 64-bit 
architectures. That would avoid having to do PowerPC-specific magic.

(But, PowerPC-specific rules would be fine too, of course.)

	Ingo
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