linux-kernel - Re: [PATCH RESEND] Kbuild: Add an option to enable GCC VTA

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Date:	Mon, 24 Nov 2014 22:46:55 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Josh Stone <jistone@...hat.com>, linux-kernel@...r.kernel.org
CC:	"Frank Ch. Eigler" <fche@...hat.com>,
	Jakub Jelinek <jakub@...hat.com>,
	Josh Boyer <jwboyer@...oraproject.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Michel Dänzer 
	<michel@...nzer.net>
Subject: Re: [PATCH RESEND] Kbuild: Add an option to enable GCC VTA

Dne 21.11.2014 v 19:40 Josh Stone napsal(a):
> Due to recent codegen issues, gcc -fvar-tracking-assignments was
> unconditionally disabled in commit 2062afb4f804a ("Fix gcc-4.9.0
> miscompilation of load_balance() in scheduler").  However, this reduces
[...]
> With gcc-4.9.2-1.fc22, I can now build v3.18-rc5 with Fedora's i686 and
> x86_64 configs, and this is completely clean with GCC_COMPARE_DEBUG.

According to gcc's bug#61801, this is really fixed in 4.9.2 (commit
556537c4 in the git mirror). So how about checking for this minimal
version instead of a new Kconfig option?

thanks,
Michal
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