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Add ThinLTO support via -lto:thin and -lto:thin-files flags

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- Add -lto:thin and -lto:thin-files CLI flags with validation
- Emit LLVM bitcode (.bc) instead of object files when LTO is enabled
- Pass -flto=thin and -flto-jobs to clang/lld linkers
- Guard linkage corrections to skip declarations without definitions
  (required for LTO where declarations appear across modules)
- Allow module-per-file with LTO even at higher optimization levels

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Jesse Meyer
2026-02-01 09:04:53 -05:00
parent f7901cffc9
commit 43ad4a1d9f
5 changed files with 78 additions and 7 deletions
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23
src/llvm_backend.cpp
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@@ -171,7 +171,7 @@ gb_internal void lb_correct_entity_linkage(lbGenerator *gen) {
LLVMValueRef other_global = nullptr;
if (ec.e->kind == Entity_Variable) {
other_global = LLVMGetNamedGlobal(ec.other_module->mod, ec.cname);
if (other_global) {
if (other_global && (LLVMGetInitializer(other_global) != nullptr || LLVMIsExternallyInitialized(other_global))) {
LLVM_SET_INTERNAL_WEAK_LINKAGE(other_global);
if (!ec.e->Variable.is_export && !ec.e->Variable.is_foreign) {
LLVMSetVisibility(other_global, LLVMHiddenVisibility);
@@ -179,7 +179,7 @@ gb_internal void lb_correct_entity_linkage(lbGenerator *gen) {
}
} else if (ec.e->kind == Entity_Procedure) {
other_global = LLVMGetNamedFunction(ec.other_module->mod, ec.cname);
if (other_global) {
if (other_global && LLVMCountBasicBlocks(other_global) != 0) {
LLVM_SET_INTERNAL_WEAK_LINKAGE(other_global);
if (!ec.e->Procedure.is_export && !ec.e->Procedure.is_foreign) {
LLVMSetVisibility(other_global, LLVMHiddenVisibility);
@@ -2332,7 +2332,12 @@ gb_internal WORKER_TASK_PROC(lb_llvm_emit_worker_proc) {
auto wd = cast(lbLLVMEmitWorker *)data;
if (LLVMTargetMachineEmitToFile(wd->target_machine, wd->m->mod, cast(char *)wd->filepath_obj.text, wd->code_gen_file_type, &llvm_error)) {
if (build_context.lto_kind != LTO_None) {
if (LLVMWriteBitcodeToFile(wd->m->mod, cast(char *)wd->filepath_obj.text)) {
gb_printf_err("Failed to write bitcode file: %.*s\n", LIT(wd->filepath_obj));
exit_with_errors();
}
} else if (LLVMTargetMachineEmitToFile(wd->target_machine, wd->m->mod, cast(char *)wd->filepath_obj.text, wd->code_gen_file_type, &llvm_error)) {
gb_printf_err("LLVM Error: %s\n", llvm_error);
exit_with_errors();
}
@@ -2701,7 +2706,9 @@ gb_internal String lb_filepath_obj_for_module(lbModule *m) {
String ext = {};
if (build_context.build_mode == BuildMode_Assembly) {
if (build_context.lto_kind != LTO_None) {
ext = STR_LIT("bc");
} else if (build_context.build_mode == BuildMode_Assembly) {
ext = STR_LIT("S");
} else if (build_context.build_mode == BuildMode_Object) {
// Allow a user override for the object extension.
@@ -2776,7 +2783,13 @@ gb_internal bool lb_llvm_object_generation(lbGenerator *gen, bool do_threading)
TIME_SECTION_WITH_LEN(section_name, gb_string_length(section_name));
if (LLVMTargetMachineEmitToFile(m->target_machine, m->mod, cast(char *)filepath_obj.text, code_gen_file_type, &llvm_error)) {
if (build_context.lto_kind != LTO_None) {
if (LLVMWriteBitcodeToFile(m->mod, cast(char *)filepath_obj.text)) {
gb_printf_err("Failed to write bitcode file: %.*s\n", LIT(filepath_obj));
exit_with_errors();
return false;
}
} else if (LLVMTargetMachineEmitToFile(m->target_machine, m->mod, cast(char *)filepath_obj.text, code_gen_file_type, &llvm_error)) {
gb_printf_err("LLVM Error: %s\n", llvm_error);
exit_with_errors();
return false;