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Use protected visibility by default on ELF platforms #105518

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Use protected visibility by default on ELF platforms#105518
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A-linkageArea: linking into static, shared libraries and binariesT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
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@pcc
pcc
opened on Dec 10, 2022

I noticed that the .so files built by x.py contain a lot of "unnecessary" PLT entries. The compiler should be using protected visibility on ELF platforms by default.

I was thinking we should be able to tie it to #[no_mangle] but on Zulip @bjorn3 proposed tying it to the SymbolExportLevel (Rust for mangled and unmangled but not exported from cdylib #[rustc_std_internal_symbol] symbols and C for #[no_mangle] symbols).

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