linux-kernel - Re: [PATCH 1/2] perf tools: Guard _GNU

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Date:   Mon, 24 Apr 2017 08:45:48 -0700
From:   Tony Jones <tonyj@...e.de>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf tools: Guard _GNU_SOURCE in pmu-events/jevents.c

On 04/24/2017 06:05 AM, Andi Kleen wrote:
> On Sun, Apr 23, 2017 at 09:26:32PM -0700, Tony Jones wrote:
>> Guard _GNU_SOURCE (as done in pt-decoder/intel-pt-decoder.c) to prevent 
>> possible redefinition error.
> 
> Who defines it? 
> 
> If it's always defined somewhere else it can be just removed.
> 
> -Andi

sometimes it's defaulted on (I believe) by the toolchain.    it fails on our SLE12-SP3 toolchain.
I assumed the existing guard in pt-decoder/intel-pt-decoder.c (only other use) was for a reason.

tony