linux-kernel - Re: [PATCH] kbuild: Disallow GCC 4.1.0 / 4.1.1

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Date:	Fri, 2 Jan 2009 09:38:14 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	rdreier@...co.com, ian.campbell@...rix.com,
	jeremy.fitzhardinge@...rix.com, deller@....de,
	rusty@...tcorp.com.au, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org, kyle@...artin.ca, randolph@...sq.org,
	sam@...nborg.org, dave@...uly1.hia.nrc.ca
Subject: Re: [PATCH] kbuild: Disallow GCC 4.1.0 / 4.1.1

On Fri, 2 Jan 2009, Linus Torvalds wrote:
> 
> I think this is wrong.
> 
> Just move the check into <linux/compiler-gcc4.h>

In fact, looking at that whole mess, I redid it all. It was disgusting how 
conditionals in gcc4.h needed to double-check that __GNUC__ really was 4 
(rather than something bigger), which largely negated the whole nice clean 
compiler version separation.

I pushed out my preferred version, which fixes up the whole thing. The 
gcc4 header file now only gets included for __GNUC__ == 4, and when we 
ever see a __GNUC__ of 5, it will automatically DTRT and try to include 
<linux/compiler-gcc5.h> instead of #4.

And then the check in gcc4.h for 4.1.0 and 4.1.1 is much simplified.  The 
two patches I pushed out add functionality, but don't actually add any new 
lines (the first simplification patch removes more lines than it adds, and 
the second one that adds the __weak bug test adds as mahy lines as the 
cleanup removed).

And it all looks more logical too, imho.

		Linus
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