nvptx: Support '--with-multilib-list' (was: Raise nvptx code generation to default PTX ISA 7.3, sm_52, therefore CUDA 11.3 (released 2021-04))

[Thomas Schwinge]

Hi!

On 2024-09-24T18:09:48+0200, I wrote:
> [...] build sm_30 multilib variants (either
> (3a) by default or (3b) upon 'configure'-time request via an additional
> option: '--with-multilib-list=default,sm_30' or similar), and the user
> builds with '-foffload-options=nvptx-none=-march=sm_30': [...]
>
> [...] I'll be happy to
> implement (3b) if people think that's still helpful.
>
> In fact, (3b) can then generally support 'configure'-time selection of
> further multilib variants to be built (for example,
> '--with-multilib-list=default,sm_30,sm_89') -- but not use them as
> default '-march=[...]', in contrast to what '--with-arch=sm_30' or
> '--with-arch=sm_89' does, for example.  I'll look into that.

Pushed to trunk branch commit 86b3a7532d56f74fcd1c362f2da7f95e8cc4e4a6
"nvptx: Support '--with-multilib-list'", see attached.


Grüße
 Thomas


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