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Add -Zfunction-return={keep,thunk-extern} option - #116892
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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.Issue: #116853.