some fixes:

* target: macOS arm64 support
* target: wasm32/64 support
* disable mcpu command (zig build is native by default)

build.zig

@@ -479,16 +479,18 @@ fn buildLDC(b: *Builder, lib: *CompileStep, config: ldcConfig) !*RunStep {
 
     // link-time optimization
     if (lib.want_lto) |enabled|
-        if (enabled) try cmds.append("--flto=thin");
+        if (enabled) try cmds.append("--flto=full");
 
     // ldc2 doesn't support zig native (a.k.a: native-native or native)
     if (lib.rootModuleTarget().isDarwin())
-        try cmds.append(b.fmt("--mtriple={s}-apple-{s}", .{ @tagName(lib.rootModuleTarget().cpu.arch), @tagName(lib.rootModuleTarget().os.tag) }))
+        try cmds.append(b.fmt("--mtriple={s}-apple-{s}", .{ if (lib.rootModuleTarget().cpu.arch.isAARCH64()) "arm64" else @tagName(lib.rootModuleTarget().cpu.arch), @tagName(lib.rootModuleTarget().os.tag) }))
+    else if (lib.rootModuleTarget().isWasm())
+        try cmds.append(b.fmt("--mtriple={s}-unknown-unknown-{s}", .{ @tagName(lib.rootModuleTarget().cpu.arch), @tagName(lib.rootModuleTarget().os.tag) }))
     else
         try cmds.append(b.fmt("--mtriple={s}-{s}-{s}", .{ @tagName(lib.rootModuleTarget().cpu.arch), @tagName(lib.rootModuleTarget().os.tag), @tagName(lib.rootModuleTarget().abi) }));
 
-    // cpu model (e.g. "generic")
-    try cmds.append(b.fmt("--mcpu={s}", .{lib.rootModuleTarget().cpu.model.name}));
+    // cpu model (e.g. "baseline")
+    // try cmds.append(b.fmt("--mcpu={s}", .{lib.rootModuleTarget().cpu.model.name}));
     // output file
     try cmds.append(b.fmt("--of={s}", .{b.pathJoin(&.{ b.install_prefix, "bin", config.name orelse "d_binary" })}));
 

tools/zigcc.zig

@@ -28,16 +28,21 @@ pub fn main() !void {
     // LDC2 not setting triple targets on host build to cc/linker, except Apple (why?)
     var isNative = true;
     while (args.next()) |arg| {
-        if (std.mem.eql(u8, arg, std.fmt.comptimePrint("{s}-apple-{s}", .{ @tagName(builtin.cpu.arch), @tagName(builtin.os.tag) }))) {
+        // MacOS M1/M2 on ldc2 replace aarch64 to arm64 - (TODO: fix?)
+        if (std.mem.eql(u8, arg, std.fmt.comptimePrint("{s}-apple-{s}", .{ if (builtin.cpu.arch.isAARCH64()) "arm64" else @tagName(builtin.cpu.arch), @tagName(builtin.os.tag) }))) {
             try cmds.append("native-native");
             try cmds.append("-fapple-link-rtlib");
+        } else if (std.mem.eql(u8, arg, std.fmt.comptimePrint("{s}-unknown-unknown-{s}", .{ @tagName(builtin.cpu.arch), @tagName(builtin.os.tag) }))) {
+            // wasm32 or wasm64
+            try cmds.append(std.fmt.comptimePrint("{s}-emscripten", .{@tagName(builtin.cpu.arch)}));
         } else if (std.mem.eql(u8, arg, "-target")) {
             isNative = false;
             try cmds.append(arg); // get "-target" flag
         } else {
             try cmds.append(arg);
         }
     }
+    // Why native? See: https://github.com/kassane/sokol-d/issues/1
     if (isNative) {
         try cmds.append("-target");
         if (builtin.os.tag == .windows)