Hide a few more standard library symbols #39252
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This hides symbols from various unstable and implementation-detail crates of the standard library. Although typically transitive exported `pub extern` functions are exported from cdylibs, these crates aren't necessary as they're all implementation details. Closes rust-lang#34493
We don't want these symbols exported from the standard library, this is just an internal implementation detail of the standard library currently. Closes rust-lang#34984
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Hide a few more standard library symbols These commits touch up some of the symbol visibility rules for some crates related to the standard library, notably: * Symbols that are `pub extern` and `#[no_mangle]` which are internal-to-rust ABI things are no longer at the `C` export level, but the `Rust` export level. This includes allocators, panic runtimes, and compiler builtins. * The libbacktrace library is now compiled with `-fvisibility=hidden` to ensure that we don't export those symbols.
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These commits touch up some of the symbol visibility rules for some crates related to the standard library, notably:
pub externand#[no_mangle]which are internal-to-rust ABI things are no longer at theCexport level, but theRustexport level. This includes allocators, panic runtimes, and compiler builtins.-fvisibility=hiddento ensure that we don't export those symbols.