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Avoid exporting __rust_alloc_error_handler_should_panic more than once. Exporting `__rust_alloc_error_handler_should_panic` multiple times causes `ld.gold` to balk with: `error: version script assignment of to symbol __rust_alloc_error_handler_should_panic failed: symbol not defined` Specifically this breaks builds of 1.70.0 and newer on DragonFly and YoctoProject with `ld.gold`. Builds with `ld.bfd` and `lld` should be unaffected. http://errors.yoctoproject.org/Errors/Details/708194/
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.