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Don't attempt to export compiler-builtins symbols from rust dylibs #137736

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Don't attempt to export compiler-builtins symbols from rust dylibs #137736

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63cfd47
Don't attempt to export compiler-builtins symbols from rust dylibs
bjorn3 Feb 27, 2025
530ab61
Also check for compiler-builtins in linked_symbols
bjorn3 Mar 21, 2025
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9 changes: 7 additions & 2 deletions compiler/rustc_codegen_ssa/src/back/linker.rs
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Original file line number Diff line number Diff line change
@@ -1782,7 +1782,10 @@ fn exported_symbols_for_non_proc_macro(tcx: TyCtxt<'_>, crate_type: CrateType) -
let mut symbols = Vec::new();
let export_threshold = symbol_export::crates_export_threshold(&[crate_type]);
for_each_exported_symbols_include_dep(tcx, crate_type, |symbol, info, cnum| {
if info.level.is_below_threshold(export_threshold) {
// Do not export mangled symbols from cdylibs and don't attempt to export compiler-builtins
// from any cdylib. The latter doesn't work anyway as we use hidden visibility for
// compiler-builtins. Most linkers silently ignore it, but ld64 gives a warning.
if info.level.is_below_threshold(export_threshold) && !tcx.is_compiler_builtins(cnum) {
symbols.push(symbol_export::exporting_symbol_name_for_instance_in_crate(
tcx, symbol, cnum,
));
@@ -1821,7 +1824,9 @@ pub(crate) fn linked_symbols(

let export_threshold = symbol_export::crates_export_threshold(&[crate_type]);
for_each_exported_symbols_include_dep(tcx, crate_type, |symbol, info, cnum| {
if info.level.is_below_threshold(export_threshold) || info.used {
if info.level.is_below_threshold(export_threshold) && !tcx.is_compiler_builtins(cnum)
|| info.used
{
symbols.push((
symbol_export::linking_symbol_name_for_instance_in_crate(tcx, symbol, cnum),
info.kind,
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