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Add -Zfunction-return={keep,thunk-extern} option #116892

Merged
merged 2 commits into from
Dec 1, 2023
Merged

Add -Zfunction-return={keep,thunk-extern} option #116892

merged 2 commits into from
Dec 1, 2023

Commits on Nov 30, 2023

  1. rustc_codegen_llvm: remove outdated count in comment 

    Signed-off-by: Miguel Ojeda <[email protected]>
    @ojeda
    ojeda committed Nov 30, 2023
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  2. Add -Zfunction-return={keep,thunk-extern} option 

    This is intended to be used for Linux kernel RETHUNK builds.

With this commit (optionally backported to Rust 1.73.0), plus a
patched Linux kernel to pass the flag, I get a RETHUNK build with
Rust enabled that is `objtool`-warning-free and is able to boot in
QEMU and load a sample Rust kernel module.

Signed-off-by: Miguel Ojeda <[email protected]>
    @ojeda
    ojeda committed Nov 30, 2023
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