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Rollup merge of #117744 - quininer:add-z-sync-uw, r=bjorn3

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Add -Zuse-sync-unwind

Currently Rust uses async unwind by default, but async unwind will bring non-negligible size overhead. it would be nice to allow users to choose this.

In addition, async unwind currently prevents LLVM from generate compact unwind for MachO, if one wishes to generate compact unwind for MachO, then also needs this flag.
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Matthias Krüger 2024-01-09 05:33:20 +01:00 • committed by GitHub
commit 9e4843e42e
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3 changed files with 8 additions and 4 deletions
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2
compiler/rustc_session/src/options.rs
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@ -1960,6 +1960,8 @@ written to standard error output)"),
"adds unstable command line options to rustc interface (default: no)"),
use_ctors_section: Option<bool> = (None, parse_opt_bool, [TRACKED],
"use legacy .ctors section for initializers rather than .init_array"),
use_sync_unwind: Option<bool> = (None, parse_opt_bool, [TRACKED],
"Generate sync unwind tables instead of async unwind tables (default: no)"),
validate_mir: bool = (false, parse_bool, [UNTRACKED],
"validate MIR after each transformation"),
#[rustc_lint_opt_deny_field_access("use `Session::verbose_internals` instead of this field")]