Le samedi 23 novembre 2024, 18:29:04 UTC Andrey Rakhmatullin a écrit :

On Sat, Nov 23, 2024 at 03:14:42PM +0100, Fabian Grünbichler wrote:

B) bump the i386 baseline in Debian to require SSE2, and stop disabling SSE2 there in rustc

As suggested by Chris, and a popular opinion/request in general.

Hi,

First if we bump ABI could we target "pABI v0" aka amd64 baseline
instead of only SSE2 ?

It is perfectly equivalent (except minor point about FXSR).

Moreover you could test cpu support using this https://wiki.debian.org/InstructionSelection#Isa_support_package

I have made qemu-good qemu-bad wrapper to test if needed

In this case, for your user I will add a wrapper that at preinst time warn user about unsupported instrution for next debian version and backport to bookworm PU

I suppose dpkg could be made pre depends on this wrapper and we could break the upgrade if instruction is not supported

Bastien
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--- SoupGate-Win32 v1.05
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On Sun, Nov 24, 2024, at 2:49 PM, Bastien Roucariès wrote:

Le samedi 23 novembre 2024, 18:29:04 UTC Andrey Rakhmatullin a écrit :

On Sat, Nov 23, 2024 at 03:14:42PM +0100, Fabian Grünbichler wrote:

B) bump the i386 baseline in Debian to require SSE2, and stop disabling SSE2 there in rustc

As suggested by Chris, and a popular opinion/request in general.

Hi,

First if we bump ABI could we target "pABI v0" aka amd64 baseline
instead of only SSE2 ?

It is perfectly equivalent (except minor point about FXSR).

I don't have any opinion on that :)

Moreover you could test cpu support using this https://wiki.debian.org/InstructionSelection#Isa_support_package

that doesn't really help. existing packages are already possibly broken in bookworm as well, and they are broken irrespective of whether the system they are installed on supports SSE2 or not.

I have made qemu-good qemu-bad wrapper to test if needed

In this case, for your user I will add a wrapper that at preinst time
warn user about unsupported instrution for next debian version and
backport to bookworm PU

I suppose dpkg could be made pre depends on this wrapper and we could
break the upgrade if instruction is not supported

see above, this only helps for non-SSE systems to prevent them from upgrading since they are no longer supported if we raise the baseline, but it doesn't actually solve the issue at hand if we don't. unless we raise the baseline only for Rust, but I don'
t really see a point in that.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sun, Nov 24, 2024 at 01:49:20PM +0000, Bastien Roucariès wrote:

B) bump the i386 baseline in Debian to require SSE2, and stop disabling SSE2 there in rustc

As suggested by Chris, and a popular opinion/request in general.

Hi,

First if we bump ABI could we target "pABI v0" aka amd64 baseline
instead of only SSE2 ?

It makes total sense.

--
WBR, wRAR

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--- SoupGate-Win32 v1.05
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To: debian-devel@lists.debian.org

Le dimanche 24 novembre 2024, 14:46:15 UTC Fabian Grünbichler a écrit :

On Sun, Nov 24, 2024, at 2:49 PM, Bastien Roucariès wrote:

Le samedi 23 novembre 2024, 18:29:04 UTC Andrey Rakhmatullin a écrit :

On Sat, Nov 23, 2024 at 03:14:42PM +0100, Fabian Grünbichler wrote:

B) bump the i386 baseline in Debian to require SSE2, and stop disabling SSE2 there in rustc

As suggested by Chris, and a popular opinion/request in general.

Hi,

First if we bump ABI could we target "pABI v0" aka amd64 baseline
instead of only SSE2 ?

It is perfectly equivalent (except minor point about FXSR).

I don't have any opinion on that :)

Moreover you could test cpu support using this https://wiki.debian.org/InstructionSelection#Isa_support_package

that doesn't really help. existing packages are already possibly broken in bookworm as well, and they are broken irrespective of whether the system they are installed on supports SSE2 or not.

I have made qemu-good qemu-bad wrapper to test if needed

In this case, for your user I will add a wrapper that at preinst time
warn user about unsupported instrution for next debian version and backport to bookworm PU

I suppose dpkg could be made pre depends on this wrapper and we could break the upgrade if instruction is not supported

see above, this only helps for non-SSE systems to prevent them from upgrading since they are no longer supported if we raise the baseline,

yes it is the goal do not upgrade if we raise the baseline

Bastien

but it doesn't actually solve the issue at hand if we don't. unless we raise the baseline only for Rust, but I don't really see a point in that.

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