diff options
Diffstat (limited to 'compiler/rustc_codegen_ssa/src/back/lto.rs')
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/lto.rs | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/back/lto.rs b/compiler/rustc_codegen_ssa/src/back/lto.rs index e6df6a2469f..f4a9037940a 100644 --- a/compiler/rustc_codegen_ssa/src/back/lto.rs +++ b/compiler/rustc_codegen_ssa/src/back/lto.rs @@ -1,6 +1,7 @@ use std::ffi::CString; use std::sync::Arc; +use rustc_ast::expand::allocator::AllocatorKind; use rustc_data_structures::memmap::Mmap; use rustc_hir::def_id::{CrateNum, LOCAL_CRATE}; use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportInfo, SymbolExportLevel}; @@ -95,6 +96,19 @@ pub(super) fn exported_symbols_for_lto( .filter_map(|&(s, info): &(ExportedSymbol<'_>, SymbolExportInfo)| { if info.level.is_below_threshold(export_threshold) || info.used { Some(symbol_name_for_instance_in_crate(tcx, s, cnum)) + } else if export_threshold == SymbolExportLevel::C + && info.rustc_std_internal_symbol + && let Some(AllocatorKind::Default) = allocator_kind_for_codegen(tcx) + { + // Export the __rdl_* exports for usage by the allocator shim when not using + // #[global_allocator]. Most of the conditions above are only used to avoid + // unnecessary expensive symbol_name_for_instance_in_crate calls. + let sym = symbol_name_for_instance_in_crate(tcx, s, cnum); + if sym.contains("__rdl_") || sym.contains("__rg_oom") { + Some(sym) + } else { + None + } } else { None } |