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Date: Thu, 25 Jul 2013 13:27:39 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: Preparing to release 0.9.12
On Thu, Jul 25, 2013 at 01:18:06PM -0400, Rich Felker wrote:
> I should add some documentation on this on the wiki. Defining what is
> part of "the ABI" is tricky. For example, you could say code built for
> armv5 is a different ABI from code built for armv4, since it's using
> instructions that aren't available on armv4. However, the key reason I
> don't consider those "different ABIs" is that, as long as the cpu
> you're running on supports all the instructions used in the main
> program and all libraries, you can use a mix of armv4 and armv5 built
> modules with no restrictions.
> [...]
> Basically, configurations A and B are different archs or subarchs if
> you can't link code built with configuration A to code built with
> configuration B.
For what it's worth, this agrees with the outcome of Debian's
discussion on adding the armhf port:
The eventual conclusion was that port names in Debian should
encode incompatible ABIs, not compatible variations within an ABI
(such as CPU optimisations, referred to as 'flavours'). The
default flavour for a port can change over time as older CPUs
become obsolete. (e.g. the i386 architecture has been built for
386, 486 and 586 flavours over time). Rebuilds of a port for a new
flavour within the ABI are possible to gain performance
improvements, but Debian itself normally provides builds to the
lowest common denominator still in widespread use, maximising
generality. Thus attempts to encode all the possible flavour
options in the port name were unnecessary and produced long and
awkward names. A better solution to the problem of recording the
flavour to which a port or package is built is suitable package
metadata.
Source: http://wiki.debian.org/ArmHardFloatPort
Rich
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