Sender: =?UTF-8?Q?Timo_Ter=C3=A4s?= <timo.teras@gmail.com>
Date: Wed, 27 May 2015 15:45:43 +0300
From: Timo Teras <timo.teras@iki.fi>
To: Natanael Copa <ncopa@alpinelinux.org>
Cc: alpine-devel@lists.alpinelinux.org
Subject: Re: [alpine-devel] Change to -march=i586 for x86?
Message-ID: <20150527154543.10781fe2@vostro>
In-Reply-To: <20150527142757.001268d6@ncopa-desktop.alpinelinux.org>
References: <20150527142757.001268d6@ncopa-desktop.alpinelinux.org>
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On Wed, 27 May 2015 14:27:57 +0200
Natanael Copa <ncopa@alpinelinux.org> wrote:

> Hi,
> 
> We currently build our x86 build with -march=i486. There was some old
> soekris and alix(?) board that had cpu with 486 instruction set.

ALIX is i586, but no PAE.

> There are issues with mesa:
> 
> [ 12956.121] (EE) AIGLX error: dlopen
> of /usr/lib/xorg/modules/dri/i915_dri.so failed (Error
> relocating /usr/lib/xorg/modules/dri/i915_dri.so:
> __sync_val_compare_and_swap_8: symbol not found)
> 
> This is because 64bit atomic ops are not available for i486.
> 
> mono and some other package (sems?) had similar issue. There are
> probably more.
> 
> I think we want drop i486 support and move to -march=i586 or newer and
> I think we want do that sooner than later.

Agreed. I think edge should be moved to i586 during next gcc bump, or
even perhaps immediately.

> The question is: What 32 bit architecture should we aim for? i586?
> i686? Do we need/want support non PAE hardware?
>
> What are the lowest boards people are using nowdays?

I use still ALIX in some installs. So I'd want non-PAE support.

Thanks,
Timo


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