Re: [PATCH] config.sub: Normalize arm64-* to aarch64-*

[John Ericson]

I'll second that this is a good idea; Apple's "aarm64" has caused much 
trouble and is wholly unnecessary as Keno says.

Also, If we apply this first, the previous email with the macOS aarch64 
config.guess support can be made more minimal.

On 7/9/20 2:02 AM, Keno Fischer wrote:
> Apple tools use arm64-* in their triples to indicate an aarch64 CPU.
> E.g. macOS 11.0 on aarch64 is `arm64-apple-darwin20.0.0`. That said,
> these tools do accept the `aarch64-*` just fine as well (LLVM
> normalizes internally). For config.sub, I think it makes sense to
> normalize arm64-* to aarch64-*, since the latter is the established
> way to refer to this architecture and likely what various configure
> scripts, etc. are checking for. I tried this change on a few
> autotools-based projects with `--build=arm64-apple-darwin` and
> the builds seemed to go through well.
> ---
>   ChangeLog                 | 4 ++++
>   config.sub                | 3 +++
>   testsuite/config-sub.data | 2 ++
>   3 files changed, 9 insertions(+)
>
> diff --git a/ChangeLog b/ChangeLog
> index c787ce9..f995b31 100644
> --- a/ChangeLog
> +++ b/ChangeLog
> @@ -1,3 +1,7 @@
> +2020-07-09  Keno Fischer  <keno@juliacomputing.com>
> +
> +       * config.sub: Normalize arm64-* to aarch64-*
> +
>   2020-06-28  John Ericson  <john.ericson@obsidian.systems>
>   
>   	* config.sub: Properly parse the KERNEL-OS case.
> diff --git a/config.sub b/config.sub
> index ce89d5c..0634942 100755
> --- a/config.sub
> +++ b/config.sub
> @@ -1104,6 +1104,9 @@ case $cpu-$vendor in
>         xscale-* | xscalee[bl]-*)
>                 cpu=`echo "$cpu" | sed 's/^xscale/arm/'`
>                 ;;
> +       arm64-*)
> +               cpu=aarch64
> +               ;;
>   
>   	# Recognize the canonical CPU Types that limit and/or modify the
>         # company names they are paired with.
> diff --git a/testsuite/config-sub.data b/testsuite/config-sub.data
> index d9639bc..197fffc 100644
> --- a/testsuite/config-sub.data
> +++ b/testsuite/config-sub.data
> @@ -103,6 +103,8 @@ armv8a                                              
> armv8a-unknown-none
>   armv8b-linux-gnueabi                          armv8b-unknown-linux-gnueabi
>   armv8m                                                armv8m-unknown-none
>   armv8r                                                armv8r-unknown-none
> +arm64-apple-darwin20.0.0                       aarch64-apple-darwin20.0.0
> +arm64-apple-ios                                        aarch64-apple-ios
>   aros                                          i386-pc-aros
>   asmjs                                         asmjs-unknown-none
>   asmjs-emscripten                              asmjs-unknown-emscripten