Commit 7733b5dbe6

@@ -167,6 +167,9 @@ discard_local_symbols: bool = false,
 /// Position Independent Executable
 pie: ?bool = null,
 
+/// Link Time Optimization mode
+lto: ?std.zig.LtoMode = null,
+
 dll_export_fns: ?bool = null,
 
 subsystem: ?std.Target.SubSystem = null,
@@ -185,7 +188,9 @@ force_undefined_symbols: std.StringHashMap(void),
 /// Overrides the default stack size
 stack_size: ?u64 = null,
 
+/// Deprecated; prefer using `lto`.
 want_lto: ?bool = null,
+
 use_llvm: ?bool,
 use_lld: ?bool,
 
@@ -1711,7 +1716,15 @@ fn getZigArgs(compile: *Compile, fuzz: bool) ![][]const u8 {
     }
 
     try addFlag(&zig_args, "PIE", compile.pie);
-    try addFlag(&zig_args, "lto", compile.want_lto);
+
+    if (compile.lto) |lto| {
+        try zig_args.append(switch (lto) {
+            .full => "-flto=full",
+            .thin => "-flto=thin",
+            .none => "-fno-lto",
+        });
+    } else try addFlag(&zig_args, "lto", compile.want_lto);
+
     try addFlag(&zig_args, "sanitize-coverage-trace-pc-guard", compile.sanitize_coverage_trace_pc_guard);
 
     if (compile.subsystem) |subsystem| {

@@ -313,6 +313,8 @@ pub const BuildId = union(enum) {
     }
 };
 
+pub const LtoMode = enum { none, full, thin };
+
 /// Renders a `std.Target.Cpu` value into a textual representation that can be parsed
 /// via the `-mcpu` flag passed to the Zig compiler.
 /// Appends the result to `buffer`.

@@ -771,7 +771,7 @@ pub const Object = struct {
         time_report: bool,
         sanitize_thread: bool,
         fuzz: bool,
-        lto: Compilation.Config.LtoMode,
+        lto: std.zig.LtoMode,
     };
 
     pub fn emit(o: *Object, options: EmitOptions) error{ LinkFailure, OutOfMemory }!void {

@@ -48,7 +48,7 @@ use_lib_llvm: bool,
 /// and updates the final binary.
 use_lld: bool,
 c_frontend: CFrontend,
-lto: LtoMode,
+lto: std.zig.LtoMode,
 /// WASI-only. Type of WASI execution model ("command" or "reactor").
 /// Always set to `command` for non-WASI targets.
 wasi_exec_model: std.builtin.WasiExecModel,
@@ -66,8 +66,6 @@ san_cov_trace_pc_guard: bool,
 
 pub const CFrontend = enum { clang, aro };
 
-pub const LtoMode = enum { none, full, thin };
-
 pub const DebugFormat = union(enum) {
     strip,
     dwarf: std.dwarf.Format,
@@ -105,7 +103,7 @@ pub const Options = struct {
     use_lib_llvm: ?bool = null,
     use_lld: ?bool = null,
     use_clang: ?bool = null,
-    lto: ?LtoMode = null,
+    lto: ?std.zig.LtoMode = null,
     /// WASI-only. Type of WASI execution model ("command" or "reactor").
     wasi_exec_model: ?std.builtin.WasiExecModel = null,
     import_memory: ?bool = null,
@@ -288,7 +286,7 @@ pub fn resolve(options: Options) ResolveError!Config {
         break :b .clang;
     };
 
-    const lto: LtoMode = b: {
+    const lto: std.zig.LtoMode = b: {
         if (!use_lld) {
             // zig ld LTO support is tracked by
             // https://github.com/ziglang/zig/issues/8680

@@ -1074,7 +1074,6 @@ pub const CreateOptions = struct {
     /// executable this field is ignored.
     want_compiler_rt: ?bool = null,
     want_ubsan_rt: ?bool = null,
-    want_lto: ?bool = null,
     function_sections: bool = false,
     data_sections: bool = false,
     time_report: bool = false,

@@ -43,12 +43,12 @@ fn add(
     switch (target.result.os.tag) {
         .windows => {
             // https://github.com/ziglang/zig/issues/8531
-            exe_cpp.want_lto = false;
+            exe_cpp.lto = .none;
         },
         .macos => {
             // https://github.com/ziglang/zig/issues/8680
-            exe_cpp.want_lto = false;
-            exe_c.want_lto = false;
+            exe_cpp.lto = .none;
+            exe_c.lto = .none;
         },
         else => {},
     }

@@ -1681,7 +1681,7 @@ pub fn addCAbiTests(b: *std.Build, options: CAbiTestOptions) *Step {
 
             // This test is intentionally trying to check if the external ABI is
             // done properly. LTO would be a hindrance to this.
-            test_step.want_lto = false;
+            test_step.lto = .none;
 
             const run = b.addRunArtifact(test_step);
             run.skip_foreign_checks = true;