Use -fvisibility=hidden for libunwind #71929
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We don't want to export any symbols from Rust's version of libunwind as these may collide with other copies of libunwind e.g. when linking Rust staticlib together C/C++ libraries that have their own version.
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Rollup of 7 pull requests Successful merges: - rust-lang#71269 (Define UB in float-to-int casts to saturate) - rust-lang#71591 (use new interface to create threads on HermitCore) - rust-lang#71819 (x.py: Give a more helpful error message if curl isn't installed) - rust-lang#71893 (Use the `impls` module to import pre-existing dataflow analyses) - rust-lang#71929 (Use -fvisibility=hidden for libunwind) - rust-lang#71937 (Ignore SGX on a few ui tests) - rust-lang#71944 (Add comment for `Ord` implementation for array) Failed merges: r? @ghost
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We don't want to export any symbols from Rust's version of libunwind
as these may collide with other copies of libunwind e.g. when linking
Rust staticlib together C/C++ libraries that have their own version.