bjoernager/rust
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Treat extern in compiler-builtins as used

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We have to preserve the symbols of the built-in functions during LTO.
This commit is contained in:
DianQK 2023-10-18 22:29:00 +08:00
parent 665da1ed32
commit b592f29a8e
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2 changed files with 8 additions and 106 deletions
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10
compiler/rustc_codegen_ssa/src/back/symbol_export.rs
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@ -54,8 +54,8 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
// export level, however, as they're just implementation details.
// Down below we'll hardwire all of the symbols to the `Rust` export
// level instead.
let special_runtime_crate =
tcx.is_panic_runtime(LOCAL_CRATE) || tcx.is_compiler_builtins(LOCAL_CRATE);
let is_compiler_builtins = tcx.is_compiler_builtins(LOCAL_CRATE);
let special_runtime_crate = tcx.is_panic_runtime(LOCAL_CRATE) || is_compiler_builtins;
let mut reachable_non_generics: DefIdMap<_> = tcx
.reachable_set(())
@ -107,7 +107,11 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
.map(|def_id| {
// We won't link right if this symbol is stripped during LTO.
let name = tcx.symbol_name(Instance::mono(tcx, def_id.to_def_id())).name;
let used = name == "rust_eh_personality";
// We have to preserve the symbols of the built-in functions during LTO.
let is_builtin_fn = is_compiler_builtins
&& symbol_export_level(tcx, def_id.to_def_id())
.is_below_threshold(SymbolExportLevel::C);
let used = is_builtin_fn || name == "rust_eh_personality";
let export_level = if special_runtime_crate {
SymbolExportLevel::Rust