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Rollup merge of #136608 - kulst:ptx_target_features, r=bjorn3 
Pass through of target features to llvm-bitcode-linker and handling them

When using the llvm-bitcode-linker (`linker-flavor=llbc`) target-features are not passed through and are not handled by it.
The llvm-bitcode-linker is mainly used as a self contained linker to link llvm bitcode for the nvptx64 target. It uses `llvm-link`, `opt` and `llc` internally. To produce a `.ptx` file of a specific ptx-version it is necessary to pass the version to llc with the `--mattr` option. Without explicitly setting it, the emitted `.ptx`-version is the minimum supported version of the `--target-cpu`.

I would like to be able to explicitly set the ptx version as [some llvm problems only occur in earlier `.ptx`-versions](https://github.com/llvm/llvm-project/issues/112998).

Therefore this pull request adds support for passing target features to llvm-bitcode-linker and handling them.
I was not quite sure if adding these features to `rustc_target/src/target_features.rs` is necessary or not. If so I will gladly add these.

    r? ``@kjetilkjeka``
2025-02-20 14:58:17 -08:00
..
src Rollup merge of #136608 - kulst:ptx_target_features, r=bjorn3 2025-02-20 14:58:17 -08:00
Cargo.toml Move hashes from rustc_data_structure to rustc_hashes so they can be shared with rust-analyzer 2025-02-16 16:18:30 -05:00
messages.ftl Rollup merge of #133429 - EnzymeAD:autodiff-middle, r=oli-obk 2025-01-31 00:26:30 -05:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.