linux-kernel - Re: [PATCH 3/10] compiler-gcc.h: Add gcc-recommended GCC

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Message-ID: <alpine.DEB.2.00.1210022332080.12717@chino.kir.corp.google.com>
Date:	Tue, 2 Oct 2012 23:32:21 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Daniel Santos <daniel.santos@...ox.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christopher Li <sparse@...isli.org>,
	David Daney <david.daney@...ium.com>,
	David Howells <dhowells@...hat.com>,
	Joe Perches <joe@...ches.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-sparse@...r.kernel.org,
	Michel Lespinasse <walken@...gle.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Pavel Pisa <pisa@....felk.cvut.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 3/10] compiler-gcc.h: Add gcc-recommended GCC_VERSION
 macro

On Fri, 28 Sep 2012, Daniel Santos wrote:

> Throughout compiler*.h, many version checks are made.  These can be
> simplified by using the macro that gcc's documentation recommends.
> However, my primary reason for adding this is that I need bug-check
> macros that are enabled at certain gcc versions and it's cleaner to use
> this macro than the tradition method:
> 
> if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ => 2)
> 
> If you add patch level, it gets this ugly:
> 
> if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 2 || \
>    __GNUC_MINOR__ == 2 __GNUC_PATCHLEVEL__ >= 1))
> 
> As opposed to:
> 
> if GCC_VERSION >= 40201
> 
> While having separate headers for gcc 3 & 4 eliminates some of this
> verbosity, they can still be cleaned up by this.
> 
> See also:
> http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
> 
> Signed-off-by: Daniel Santos <daniel.santos@...ox.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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