diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/base.rs')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/base.rs | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/compiler/rustc_codegen_llvm/src/base.rs b/compiler/rustc_codegen_llvm/src/base.rs index 9cc5d8dbc21..978134cc32b 100644 --- a/compiler/rustc_codegen_llvm/src/base.rs +++ b/compiler/rustc_codegen_llvm/src/base.rs @@ -109,18 +109,36 @@ pub(crate) fn compile_codegen_unit( attributes::apply_to_llfn(entry, llvm::AttributePlace::Function, &attrs); } + // Define Objective-C module info and module flags. Note, the module info will + // also be added to the `llvm.compiler.used` variable, created later. + // + // These are only necessary when we need the linker to do its Objective-C-specific + // magic. We could theoretically do it unconditionally, but at a slight cost to linker + // performance in the common case where it's unnecessary. + if !cx.objc_classrefs.borrow().is_empty() || !cx.objc_selrefs.borrow().is_empty() { + if cx.objc_abi_version() == 1 { + cx.define_objc_module_info(); + } + cx.add_objc_module_flags(); + } + // Finalize code coverage by injecting the coverage map. Note, the coverage map will // also be added to the `llvm.compiler.used` variable, created next. if cx.sess().instrument_coverage() { cx.coverageinfo_finalize(); } - // Create the llvm.used and llvm.compiler.used variables. + // Create the llvm.used variable. if !cx.used_statics.is_empty() { cx.create_used_variable_impl(c"llvm.used", &cx.used_statics); } - if !cx.compiler_used_statics.is_empty() { - cx.create_used_variable_impl(c"llvm.compiler.used", &cx.compiler_used_statics); + + // Create the llvm.compiler.used variable. + { + let compiler_used_statics = cx.compiler_used_statics.borrow(); + if !compiler_used_statics.is_empty() { + cx.create_used_variable_impl(c"llvm.compiler.used", &compiler_used_statics); + } } // Run replace-all-uses-with for statics that need it. This must |