linux-kernel - Re: [PATCH] gcc: clamp gcc version to most highest specific header version available

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Date:	Fri, 05 Sep 2014 14:09:24 -0700
From:	Joe Perches <joe@...ches.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	linux-kernel@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
	Sasha Levin <sasha.levin@...cle.com>, akpm@...uxfoundation.org,
	mingo@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Richard Weinberger <richard.weinberger@...il.com>
Subject: Re: [PATCH] gcc: clamp gcc version to most highest specific header
 version available

On Fri, 2014-09-05 at 22:39 +0200, Hannes Frederic Sowa wrote:
> As announced in [1] gcc will increase its major number yearly but we don't
> need to include gcc version specific quirks for every version normally.
> 
> This patch allows to compile every kernel with all new versions of gcc
> without adding a specific compiler-gccX.h header. We do so by clamping
> the __GNUC__ version to the most specific version dependent header file.
> 
> If someone adds a new gccX.h file __GCC_CLAMP_VERSION_HEADER also needs
> to be modified.
> 
> The decision if chained including of header files (e.g. gcc5.h includes
> gcc4.h) is necessary or should be avoided can be postponed until more
> experience in using the official gcc release is gained.

I think the churn rate in the gcc compiler specific
#include headers will be low enough that a single
combined file should be acceptable.

Keeping all the gcc #defines together seems more
readable to me.

The trivial integration I did eliminated one
duplicate #define as well as that hack for
#include gcc_header(__GNUC__)




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