Add support for loongarch64

[zhangwenlong8911]

No description provided.

[rtzoeller]

It's difficult for the nix maintainers to validate changes for platforms which are not supported by rustc, including ensuring they don't immediately regress in support as part of other changes. I see that there is a PR up adding support to rustc for loongarch64-unknown-linux-gnu; this change is likely gated on that PR and until loongarch64-unknown-linux-gnu is supported as at least a Tier 3 target by the Rust compiler.

Once loongarch64-unknown-linux-gnu is supported as a Tier 3 target by rustc, I'd like to see it added to our CI pipeline as part of this PR, so we can ensure the support doesn't regress. #1603 is a good example of the changes needed. Note that it'd be added to the Tier 3 section of README.md, not Tier 1.

[zhangwenlong8911]

It's difficult for the nix maintainers to validate changes for platforms which are not supported by rustc, including ensuring they don't immediately regress in support as part of other changes. I see that there is a PR up adding support to rustc for loongarch64-unknown-linux-gnu; this change is likely gated on that PR and until loongarch64-unknown-linux-gnu is supported as at least a Tier 3 target by the Rust compiler.

Once loongarch64-unknown-linux-gnu is supported as a Tier 3 target by rustc, I'd like to see it added to our CI pipeline as part of this PR, so we can ensure the support doesn't regress. #1603 is a good example of the changes needed. Note that it'd be added to the Tier 3 section of README.md, not Tier 1.

thank you very much for your suggestion, I have moved loongarch64-unknown-linux-gnu to the Tier 3 section of README.md

[xry111]

It's difficult for the nix maintainers to validate changes for platforms which are not supported by rustc, including ensuring they don't immediately regress in support as part of other changes. I see that there is a PR up adding support to rustc for loongarch64-unknown-linux-gnu; this change is likely gated on that PR and until loongarch64-unknown-linux-gnu is supported as at least a Tier 3 target by the Rust compiler.
Once loongarch64-unknown-linux-gnu is supported as a Tier 3 target by rustc, I'd like to see it added to our CI pipeline as part of this PR, so we can ensure the support doesn't regress. #1603 is a good example of the changes needed. Note that it'd be added to the Tier 3 section of README.md, not Tier 1.

thank you very much for your suggestion, I have moved loongarch64-unknown-linux-gnu to the Tier 3 section of README.md

We will use loongarch64-unknown-linux-gnuf64 as the target name (see rust-lang/rust#96971). AFAIK rustc doesn't have any "alias" support for target names so we can't use a plain loongarch64-unknown-linux-gnu.

[xen0n]

And please just wait until rust-lang/rust#96971 is merged and released, otherwise the code here would be still useless at best, or require further changes if things change at the Rust side.

[xen0n]

No. Loongnix is old-world but here it's 100% sure this should be running on a new-world distro. This could be just Linux loongarch64 lp64d, and any adaptations for Loongnix should be done in your downstream fork specifically for Loongnix, not here.

[zhangwenlong8911]

And please just wait until rust-lang/rust#96971 is merged and released, otherwise the code here would be still useless at best, or require further changes if things change at the Rust side.

Thans for your review, i just rebase the code, I whill wait until rust-lang/rust#96971 is merged and released

[xen0n]

Enough time has passed that LoongArch is already pretty well supported by Rust 1.72.0, so this PR could get a rebase?

[xen0n]

We're back to using loongarch64-unknown-linux-gnu in the final iteration of rust-lang/rust#96971, so the tuple should get restored here.

[xen0n]

We're now Tier 2 with host tools, so please move the (corrected) tuple here to the appropriate location too.

[xen0n]

Ah, so an equivalent change was already merged in #2045. This can be safely closed then.