Rollup of 4 pull requests #147175
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Rollup of 4 pull requests #147175
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This allows building a rustc capable of running the frontend without any backend present. While this may not seem all that useful, it allows running the frontend of rustc to report errors or running miri to interpret a program without any backend present. This is useful when you are trying to say run miri in the browser as upstream LLVM can't be compiled for wasm yet. Or to run rustc itself in miri like I did a while ago and caught some UB.
…rrowLii Improve the documentation around `ZERO_AR_DATE` In particular, document why we don't use the new `-reproducible` flag. I went through [the source for Apple's old linker](https://github.com/apple-oss-distributions/ld64), and compared the versions with [the mapping to Xcode versions on Wikipedia](https://en.wikipedia.org/wiki/Xcode) to find the relevant Xcode versions for these features. r? compiler
Add a dummy codegen backend This allows building a rustc capable of running the frontend without any backend present. While this may not seem all that useful, it allows running the frontend of rustc to report errors or running miri to interpret a program without any backend present. This is useful when you are trying to say run miri in the browser as upstream LLVM can't be compiled for wasm yet. Or to run rustc itself in miri like I did a while ago and caught some UB.
…arrowLii Don’t suggest foreign `doc(hidden)` types in "the following other types implement trait" diagnostics Fixes rust-lang#132024. `@rustbot` label A-diagnostics T-compiler
cg_llvm: Stop using `as_c_char_ptr` for coverage-related bindings [As explained by a note in `ffi.rs`](https://github.com/rust-lang/rust/blob/8a1b39995e5b630c5872f5de5079f1f569bd5ac2/compiler/rustc_codegen_llvm/src/llvm/ffi.rs#L4-L11), passing strings and byte slices through FFI is more convenient if we take advantage of the fact that `*const c_uchar` and `*const c_char` have the same ABI. Doing so avoids having to rely on a special helper function, since we can just call `as_ptr` instead. (The same logic applies to every other binding that currently uses the `as_c_char_ptr` helper; I just haven't adjusted all of them yet.) --- As a drive-by change, this PR also marks some coverage-related FFI bindings as `safe`.
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Rollup of 4 pull requests Successful merges: - #146518 (Improve the documentation around `ZERO_AR_DATE`) - #146596 (Add a dummy codegen backend) - #146617 (Don’t suggest foreign `doc(hidden)` types in "the following other types implement trait" diagnostics) - #146635 (cg_llvm: Stop using `as_c_char_ptr` for coverage-related bindings) r? `@ghost` `@rustbot` modify labels: rollup
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Successful merges:
ZERO_AR_DATE#146518 (Improve the documentation aroundZERO_AR_DATE)doc(hidden)types in "the following other types implement trait" diagnostics #146617 (Don’t suggest foreigndoc(hidden)types in "the following other types implement trait" diagnostics)as_c_char_ptrfor coverage-related bindings #146635 (cg_llvm: Stop usingas_c_char_ptrfor coverage-related bindings)r? @ghost
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