From da742fc526a47dcbd0333ea7d5b3550f38b0d52d Mon Sep 17 00:00:00 2001 From: A1029384756 Date: Mon, 8 Jun 2026 10:58:05 -0400 Subject: [PATCH] [no-plt] enable no-plt behavior on linux arm64 and amd64 targets --- src/build_settings.cpp | 7 +++++++ src/llvm_backend.cpp | 6 ++++++ src/llvm_backend_general.cpp | 6 ++++++ src/llvm_backend_proc.cpp | 7 +++++++ 4 files changed, 26 insertions(+) diff --git a/src/build_settings.cpp b/src/build_settings.cpp index 4d8a5a495..e3d79e1b9 100644 --- a/src/build_settings.cpp +++ b/src/build_settings.cpp @@ -602,6 +602,7 @@ struct BuildContext { RelocMode reloc_mode; bool disable_red_zone; bool disable_unwind; + bool no_plt; isize max_error_count; @@ -1902,6 +1903,12 @@ gb_internal void init_build_context(TargetMetrics *cross_target, Subtarget subta if (bc->reloc_mode == RelocMode_Default) { bc->reloc_mode = RelocMode_PIC; } + switch (metrics->arch) { + case TargetArch_arm64: + case TargetArch_amd64: + bc->no_plt = true; + break; + } } else if (metrics->os == TargetOs_openbsd) { // Always use PIC for OpenBSD: it defaults to PIE if (bc->reloc_mode == RelocMode_Default) { diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp index e08116736..15ff125d4 100644 --- a/src/llvm_backend.cpp +++ b/src/llvm_backend.cpp @@ -2142,6 +2142,9 @@ gb_internal lbProcedure *lb_create_startup_runtime(lbModule *main_module, lbProc lbProcedure *p = lb_create_dummy_procedure(main_module, str_lit(LB_STARTUP_RUNTIME_PROC_NAME), proc_type); p->is_startup = true; + if (build_context.no_plt) { + lb_add_attribute_to_proc(p->module, p->value, "nonlazybind"); + } lb_add_attribute_to_proc(p->module, p->value, "optnone"); lb_add_attribute_to_proc(p->module, p->value, "noinline"); @@ -2162,6 +2165,9 @@ gb_internal lbProcedure *lb_create_cleanup_runtime(lbModule *main_module) { // C lbProcedure *p = lb_create_dummy_procedure(main_module, str_lit(LB_CLEANUP_RUNTIME_PROC_NAME), proc_type); p->is_startup = true; + if (build_context.no_plt) { + lb_add_attribute_to_proc(p->module, p->value, "nonlazybind"); + } lb_add_attribute_to_proc(p->module, p->value, "optnone"); lb_add_attribute_to_proc(p->module, p->value, "noinline"); diff --git a/src/llvm_backend_general.cpp b/src/llvm_backend_general.cpp index 8068670f0..27a8c66e3 100644 --- a/src/llvm_backend_general.cpp +++ b/src/llvm_backend_general.cpp @@ -59,6 +59,12 @@ gb_internal WORKER_TASK_PROC(lb_init_module_worker_proc) { m->ctx = LLVMContextCreate(); m->mod = LLVMModuleCreateWithNameInContext(m->module_name, m->ctx); // m->debug_builder = nullptr; + if (build_context.no_plt) { + LLVMAddModuleFlag(m->mod, + LLVMModuleFlagBehaviorWarning, + "RtLibUseGOT", 11, + LLVMValueAsMetadata(LLVMConstInt(LLVMInt32TypeInContext(m->ctx), 1, true))); + } if (build_context.ODIN_DEBUG) { enum {DEBUG_METADATA_VERSION = 3}; diff --git a/src/llvm_backend_proc.cpp b/src/llvm_backend_proc.cpp index e26bac5c6..8738dbc9c 100644 --- a/src/llvm_backend_proc.cpp +++ b/src/llvm_backend_proc.cpp @@ -2,6 +2,9 @@ gb_internal LLVMValueRef lb_call_intrinsic(lbProcedure *p, const char *name, LLV unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name)); GB_ASSERT_MSG(id != 0, "Unable to find %s", name); LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, type_count); + if (build_context.no_plt) { + lb_add_attribute_to_proc(p->module, ip, "nonlazybind"); + } LLVMTypeRef call_type = LLVMIntrinsicGetType(p->module->ctx, id, types, type_count); return LLVMBuildCall2(p->builder, call_type, ip, args, arg_count, ""); } @@ -153,6 +156,10 @@ gb_internal lbProcedure *lb_create_procedure(lbModule *m, Entity *entity, bool i lb_ensure_abi_function_type(m, p); lb_add_function_type_attributes(p->value, p->abi_function_type, p->abi_function_type->calling_convention); + if (build_context.no_plt) { + lb_add_attribute_to_proc(m, p->value, "nonlazybind"); + } + if (build_context.disable_unwind) { lb_add_attribute_to_proc(m, p->value, "nounwind"); }