Re: ARM ABI changes/combinations (was Re: Preparation for creating netbsd-7 branch)

[Alan Barrett <apb%cequrux.com@localhost>]

On Wed, 23 Jul 2014, Jeff Rizzo wrote:
> Attached is the proposed diff to build.sh with the changes, including 
> hpcarm -> MACHINE_ARCH=earmv4 .

This patch introduces many cases in which the same 
MACHINE/MACHINE_ARCH pair is listed under more than one ALIAS.  I 
don't see the point of that.

Aliases are primarily useful as a shorthand for people who run 
build.sh, and such people can be expected to adapt to changed 
alias names or changed defaults, without needing both old and new 
alias names to refer to identical MACHINE/MACHINE_ARCH pairs.

OK, aliases are also usable with kver(8) from 
pkgsrc/devel/libkver, which contains a cut and pasted copy of 
the part of build.sh that deals with MACHINE/MACHINE_ARCH/ALIAS 
parsing, but kver uses are so specialised that I don't think we 
need backward compatible aliases there either.

For example, in this list ...

> -MACHINE=evbarm         MACHINE_ARCH=arm        ALIAS=evbarm-el DEFAULT
> -MACHINE=evbarm         MACHINE_ARCH=armeb      ALIAS=evbarm-eb
> +MACHINE=evbarm         MACHINE_ARCH=arm        ALIAS=evboarm-el
> +MACHINE=evbarm         MACHINE_ARCH=armeb      ALIAS=evboarm-eb
> +MACHINE=evbarm         MACHINE_ARCH=earm       ALIAS=evbarm-el DEFAULT
> MACHINE=evbarm          MACHINE_ARCH=earm       ALIAS=evbearm-el
> +MACHINE=evbarm         MACHINE_ARCH=earmeb     ALIAS=evbarm-eb
> MACHINE=evbarm          MACHINE_ARCH=earmeb     ALIAS=evbearm-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmhf     ALIAS=evbarmhf-el
> MACHINE=evbarm          MACHINE_ARCH=earmhf     ALIAS=evbearmhf-el
> +MACHINE=evbarm         MACHINE_ARCH=earmhfeb   ALIAS=evbarmhf-eb
> MACHINE=evbarm          MACHINE_ARCH=earmhfeb   ALIAS=evbearmhf-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmv4     ALIAS=evbarmv4-el
> MACHINE=evbarm          MACHINE_ARCH=earmv4     ALIAS=evbearmv4-el
> +MACHINE=evbarm         MACHINE_ARCH=earmv4eb   ALIAS=evbarmv4-eb
> MACHINE=evbarm          MACHINE_ARCH=earmv4eb   ALIAS=evbearmv4-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmv5     ALIAS=evbarmv5-el
> MACHINE=evbarm          MACHINE_ARCH=earmv5     ALIAS=evbearmv5-el
> +MACHINE=evbarm         MACHINE_ARCH=earmv5eb   ALIAS=evbarmv5-eb
> MACHINE=evbarm          MACHINE_ARCH=earmv5eb   ALIAS=evbearmv5-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmv6     ALIAS=evbarmv6-el
> MACHINE=evbarm          MACHINE_ARCH=earmv6     ALIAS=evbearmv6-el
> +MACHINE=evbarm         MACHINE_ARCH=earmv6hf   ALIAS=evbarmv6hf-el
> MACHINE=evbarm          MACHINE_ARCH=earmv6hf   ALIAS=evbearmv6hf-el
> +MACHINE=evbarm         MACHINE_ARCH=earmv6eb   ALIAS=evbarmv6-eb
> MACHINE=evbarm          MACHINE_ARCH=earmv6eb   ALIAS=evbearmv6-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmv6hfeb ALIAS=evbarmv6hf-eb
> MACHINE=evbarm          MACHINE_ARCH=earmv6hfeb ALIAS=evbearmv6hf-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmv7     ALIAS=evbarmv7-el
> MACHINE=evbarm          MACHINE_ARCH=earmv7     ALIAS=evbearmv7-el
> +MACHINE=evbarm         MACHINE_ARCH=earmv7eb   ALIAS=evbarmv7-eb
> MACHINE=evbarm          MACHINE_ARCH=earmv7eb   ALIAS=evbearmv7-eb
> +MACHINE=evbarm         MACHINE_ARCH=earmv7hf   ALIAS=evbarmv7hf-el
> MACHINE=evbarm          MACHINE_ARCH=earmv7hf   ALIAS=evbearmv7hf-el
> +MACHINE=evbarm         MACHINE_ARCH=earmv7hfeb ALIAS=evbarmv7hf-eb
> MACHINE=evbarm          MACHINE_ARCH=earmv7hfeb ALIAS=evbearmv7hf-eb

... I'd keep the new ALIAS=evbearm* and remove the old ALIAS=evbarm*
lines, not provide both.

--apb (Alan Barrett)