Commit 7c1dbfab72

Andrew Kelley <andrew@ziglang.org>
2019-12-11 08:08:33
self-hosted: manually parse args
1 parent c3d8b1f
Changed files (7)
lib/std/meta/trait.zig
@@ -14,7 +14,6 @@ fn traitFnWorkaround(comptime T: type) bool {
 }
 
 pub const TraitFn = @TypeOf(traitFnWorkaround);
-///
 
 //////Trait generators
 
@@ -55,7 +54,6 @@ test "std.meta.trait.multiTrait" {
     testing.expect(!isVector(u8));
 }
 
-///
 pub fn hasFn(comptime name: []const u8) TraitFn {
     const Closure = struct {
         pub fn trait(comptime T: type) bool {
@@ -79,7 +77,6 @@ test "std.meta.trait.hasFn" {
     testing.expect(!hasFn("useless")(u8));
 }
 
-///
 pub fn hasField(comptime name: []const u8) TraitFn {
     const Closure = struct {
         pub fn trait(comptime T: type) bool {
@@ -113,7 +110,6 @@ test "std.meta.trait.hasField" {
     testing.expect(!hasField("value")(u8));
 }
 
-///
 pub fn is(comptime id: builtin.TypeId) TraitFn {
     const Closure = struct {
         pub fn trait(comptime T: type) bool {
@@ -131,7 +127,6 @@ test "std.meta.trait.is" {
     testing.expect(!is(builtin.TypeId.Optional)(anyerror));
 }
 
-///
 pub fn isPtrTo(comptime id: builtin.TypeId) TraitFn {
     const Closure = struct {
         pub fn trait(comptime T: type) bool {
@@ -173,7 +168,6 @@ test "std.meta.trait.isExtern" {
     testing.expect(!isExtern(u8));
 }
 
-///
 pub fn isPacked(comptime T: type) bool {
     const Packed = builtin.TypeInfo.ContainerLayout.Packed;
     const info = @typeInfo(T);
@@ -194,7 +188,6 @@ test "std.meta.trait.isPacked" {
     testing.expect(!isPacked(u8));
 }
 
-///
 pub fn isUnsignedInt(comptime T: type) bool {
     return switch (@typeId(T)) {
         builtin.TypeId.Int => !@typeInfo(T).Int.is_signed,
@@ -209,7 +202,6 @@ test "isUnsignedInt" {
     testing.expect(isUnsignedInt(f64) == false);
 }
 
-///
 pub fn isSignedInt(comptime T: type) bool {
     return switch (@typeId(T)) {
         builtin.TypeId.ComptimeInt => true,
@@ -225,7 +217,6 @@ test "isSignedInt" {
     testing.expect(isSignedInt(f64) == false);
 }
 
-///
 pub fn isSingleItemPtr(comptime T: type) bool {
     if (comptime is(builtin.TypeId.Pointer)(T)) {
         const info = @typeInfo(T);
@@ -241,7 +232,6 @@ test "std.meta.trait.isSingleItemPtr" {
     testing.expect(!isSingleItemPtr(@TypeOf(array[0..1])));
 }
 
-///
 pub fn isManyItemPtr(comptime T: type) bool {
     if (comptime is(builtin.TypeId.Pointer)(T)) {
         const info = @typeInfo(T);
@@ -258,7 +248,6 @@ test "std.meta.trait.isManyItemPtr" {
     testing.expect(!isManyItemPtr(@TypeOf(array[0..1])));
 }
 
-///
 pub fn isSlice(comptime T: type) bool {
     if (comptime is(builtin.TypeId.Pointer)(T)) {
         const info = @typeInfo(T);
@@ -274,7 +263,6 @@ test "std.meta.trait.isSlice" {
     testing.expect(!isSlice(@TypeOf(&array[0])));
 }
 
-///
 pub fn isIndexable(comptime T: type) bool {
     if (comptime is(builtin.TypeId.Pointer)(T)) {
         const info = @typeInfo(T);
@@ -297,7 +285,6 @@ test "std.meta.trait.isIndexable" {
     testing.expect(!isIndexable(meta.Child(@TypeOf(slice))));
 }
 
-///
 pub fn isNumber(comptime T: type) bool {
     return switch (@typeId(T)) {
         builtin.TypeId.Int, builtin.TypeId.Float, builtin.TypeId.ComptimeInt, builtin.TypeId.ComptimeFloat => true,
src-self-hosted/arg.zig
@@ -1,293 +0,0 @@
-const std = @import("std");
-const debug = std.debug;
-const testing = std.testing;
-const mem = std.mem;
-
-const Allocator = mem.Allocator;
-const ArrayList = std.ArrayList;
-const StringHashMap = std.StringHashMap;
-
-fn trimStart(slice: []const u8, ch: u8) []const u8 {
-    var i: usize = 0;
-    for (slice) |b| {
-        if (b != '-') break;
-        i += 1;
-    }
-
-    return slice[i..];
-}
-
-fn argInAllowedSet(maybe_set: ?[]const []const u8, arg: []const u8) bool {
-    if (maybe_set) |set| {
-        for (set) |possible| {
-            if (mem.eql(u8, arg, possible)) {
-                return true;
-            }
-        }
-        return false;
-    } else {
-        return true;
-    }
-}
-
-// Modifies the current argument index during iteration
-fn readFlagArguments(allocator: *Allocator, args: []const []const u8, required: usize, allowed_set: ?[]const []const u8, index: *usize) !FlagArg {
-    switch (required) {
-        0 => return FlagArg{ .None = undefined }, // TODO: Required to force non-tag but value?
-        1 => {
-            if (index.* + 1 >= args.len) {
-                return error.MissingFlagArguments;
-            }
-
-            index.* += 1;
-            const arg = args[index.*];
-
-            if (!argInAllowedSet(allowed_set, arg)) {
-                return error.ArgumentNotInAllowedSet;
-            }
-
-            return FlagArg{ .Single = arg };
-        },
-        else => |needed| {
-            var extra = ArrayList([]const u8).init(allocator);
-            errdefer extra.deinit();
-
-            var j: usize = 0;
-            while (j < needed) : (j += 1) {
-                if (index.* + 1 >= args.len) {
-                    return error.MissingFlagArguments;
-                }
-
-                index.* += 1;
-                const arg = args[index.*];
-
-                if (!argInAllowedSet(allowed_set, arg)) {
-                    return error.ArgumentNotInAllowedSet;
-                }
-
-                try extra.append(arg);
-            }
-
-            return FlagArg{ .Many = extra };
-        },
-    }
-}
-
-const HashMapFlags = StringHashMap(FlagArg);
-
-// A store for querying found flags and positional arguments.
-pub const Args = struct {
-    flags: HashMapFlags,
-    positionals: ArrayList([]const u8),
-
-    pub fn parse(allocator: *Allocator, comptime spec: []const Flag, args: []const []const u8) !Args {
-        var parsed = Args{
-            .flags = HashMapFlags.init(allocator),
-            .positionals = ArrayList([]const u8).init(allocator),
-        };
-
-        var i: usize = 0;
-        next: while (i < args.len) : (i += 1) {
-            const arg = args[i];
-
-            if (arg.len != 0 and arg[0] == '-') {
-                // TODO: hashmap, although the linear scan is okay for small argument sets as is
-                for (spec) |flag| {
-                    if (mem.eql(u8, arg, flag.name)) {
-                        const flag_name_trimmed = trimStart(flag.name, '-');
-                        const flag_args = readFlagArguments(allocator, args, flag.required, flag.allowed_set, &i) catch |err| {
-                            switch (err) {
-                                error.ArgumentNotInAllowedSet => {
-                                    std.debug.warn("argument '{}' is invalid for flag '{}'\n", .{ args[i], arg });
-                                    std.debug.warn("allowed options are ", .{});
-                                    for (flag.allowed_set.?) |possible| {
-                                        std.debug.warn("'{}' ", .{possible});
-                                    }
-                                    std.debug.warn("\n", .{});
-                                },
-                                error.MissingFlagArguments => {
-                                    std.debug.warn("missing argument for flag: {}\n", .{arg});
-                                },
-                                else => {},
-                            }
-
-                            return err;
-                        };
-
-                        if (flag.mergable) {
-                            var prev = if (parsed.flags.get(flag_name_trimmed)) |entry| entry.value.Many else ArrayList([]const u8).init(allocator);
-
-                            // MergeN creation disallows 0 length flag entry (doesn't make sense)
-                            switch (flag_args) {
-                                .None => unreachable,
-                                .Single => |inner| try prev.append(inner),
-                                .Many => |inner| try prev.appendSlice(inner.toSliceConst()),
-                            }
-
-                            _ = try parsed.flags.put(flag_name_trimmed, FlagArg{ .Many = prev });
-                        } else {
-                            _ = try parsed.flags.put(flag_name_trimmed, flag_args);
-                        }
-
-                        continue :next;
-                    }
-                }
-
-                // TODO: Better errors with context, global error state and return is sufficient.
-                std.debug.warn("could not match flag: {}\n", .{arg});
-                return error.UnknownFlag;
-            } else {
-                try parsed.positionals.append(arg);
-            }
-        }
-
-        return parsed;
-    }
-
-    pub fn deinit(self: *Args) void {
-        self.flags.deinit();
-        self.positionals.deinit();
-    }
-
-    // e.g. --help
-    pub fn present(self: *const Args, name: []const u8) bool {
-        return self.flags.contains(name);
-    }
-
-    // e.g. --name value
-    pub fn single(self: *Args, name: []const u8) ?[]const u8 {
-        if (self.flags.get(name)) |entry| {
-            switch (entry.value) {
-                .Single => |inner| {
-                    return inner;
-                },
-                else => @panic("attempted to retrieve flag with wrong type"),
-            }
-        } else {
-            return null;
-        }
-    }
-
-    // e.g. --names value1 value2 value3
-    pub fn many(self: *Args, name: []const u8) []const []const u8 {
-        if (self.flags.get(name)) |entry| {
-            switch (entry.value) {
-                .Many => |inner| {
-                    return inner.toSliceConst();
-                },
-                else => @panic("attempted to retrieve flag with wrong type"),
-            }
-        } else {
-            return &[_][]const u8{};
-        }
-    }
-};
-
-// Arguments for a flag. e.g. arg1, arg2 in `--command arg1 arg2`.
-const FlagArg = union(enum) {
-    None,
-    Single: []const u8,
-    Many: ArrayList([]const u8),
-};
-
-// Specification for how a flag should be parsed.
-pub const Flag = struct {
-    name: []const u8,
-    required: usize,
-    mergable: bool,
-    allowed_set: ?[]const []const u8,
-
-    pub fn Bool(comptime name: []const u8) Flag {
-        return ArgN(name, 0);
-    }
-
-    pub fn Arg1(comptime name: []const u8) Flag {
-        return ArgN(name, 1);
-    }
-
-    pub fn ArgN(comptime name: []const u8, comptime n: usize) Flag {
-        return Flag{
-            .name = name,
-            .required = n,
-            .mergable = false,
-            .allowed_set = null,
-        };
-    }
-
-    pub fn ArgMergeN(comptime name: []const u8, comptime n: usize) Flag {
-        if (n == 0) {
-            @compileError("n must be greater than 0");
-        }
-
-        return Flag{
-            .name = name,
-            .required = n,
-            .mergable = true,
-            .allowed_set = null,
-        };
-    }
-
-    pub fn Option(comptime name: []const u8, comptime set: []const []const u8) Flag {
-        return Flag{
-            .name = name,
-            .required = 1,
-            .mergable = false,
-            .allowed_set = set,
-        };
-    }
-};
-
-test "parse arguments" {
-    const spec1 = comptime [_]Flag{
-        Flag.Bool("--help"),
-        Flag.Bool("--init"),
-        Flag.Arg1("--build-file"),
-        Flag.Option("--color", [_][]const u8{
-            "on",
-            "off",
-            "auto",
-        }),
-        Flag.ArgN("--pkg-begin", 2),
-        Flag.ArgMergeN("--object", 1),
-        Flag.ArgN("--library", 1),
-    };
-
-    const cliargs = [_][]const u8{
-        "build",
-        "--help",
-        "pos1",
-        "--build-file",
-        "build.zig",
-        "--object",
-        "obj1",
-        "--object",
-        "obj2",
-        "--library",
-        "lib1",
-        "--library",
-        "lib2",
-        "--color",
-        "on",
-        "pos2",
-    };
-
-    var args = try Args.parse(std.debug.global_allocator, spec1, cliargs);
-
-    testing.expect(args.present("help"));
-    testing.expect(!args.present("help2"));
-    testing.expect(!args.present("init"));
-
-    testing.expect(mem.eql(u8, args.single("build-file").?, "build.zig"));
-    testing.expect(mem.eql(u8, args.single("color").?, "on"));
-
-    const objects = args.many("object").?;
-    testing.expect(mem.eql(u8, objects[0], "obj1"));
-    testing.expect(mem.eql(u8, objects[1], "obj2"));
-
-    testing.expect(mem.eql(u8, args.single("library").?, "lib2"));
-
-    const pos = args.positionals.toSliceConst();
-    testing.expect(mem.eql(u8, pos[0], "build"));
-    testing.expect(mem.eql(u8, pos[1], "pos1"));
-    testing.expect(mem.eql(u8, pos[2], "pos2"));
-}
src-self-hosted/codegen.zig
@@ -101,8 +101,6 @@ pub async fn renderToLlvm(comp: *Compilation, fn_val: *Value.Fn, code: *ir.Code)
         _ = llvm.VerifyModule(ofile.module, llvm.AbortProcessAction, &error_ptr);
     }
 
-    assert(comp.emit_file_type == Compilation.Emit.Binary); // TODO support other types
-
     const is_small = comp.build_mode == .ReleaseSmall;
     const is_debug = comp.build_mode == .Debug;
 
src-self-hosted/compilation.zig
@@ -135,22 +135,17 @@ pub const Compilation = struct {
     /// lazily created when we need it
     tmp_dir: event.Future(BuildError![]u8) = event.Future(BuildError![]u8).init(),
 
-    version_major: u32 = 0,
-    version_minor: u32 = 0,
-    version_patch: u32 = 0,
+    version: builtin.Version = builtin.Version{ .major = 0, .minor = 0, .patch = 0 },
 
     linker_script: ?[]const u8 = null,
     out_h_path: ?[]const u8 = null,
 
     is_test: bool = false,
-    each_lib_rpath: bool = false,
     strip: bool = false,
     is_static: bool,
     linker_rdynamic: bool = false,
 
     clang_argv: []const []const u8 = &[_][]const u8{},
-    lib_dirs: []const []const u8 = &[_][]const u8{},
-    rpath_list: []const []const u8 = &[_][]const u8{},
     assembly_files: []const []const u8 = &[_][]const u8{},
 
     /// paths that are explicitly provided by the user to link against
@@ -162,9 +157,6 @@ pub const Compilation = struct {
 
     pub const FnLinkSet = std.TailQueue(?*Value.Fn);
 
-    windows_subsystem_windows: bool = false,
-    windows_subsystem_console: bool = false,
-
     link_libs_list: ArrayList(*LinkLib),
     libc_link_lib: ?*LinkLib = null,
 
@@ -178,17 +170,18 @@ pub const Compilation = struct {
     verbose_llvm_ir: bool = false,
     verbose_link: bool = false,
 
-    darwin_frameworks: []const []const u8 = &[_][]const u8{},
     darwin_version_min: DarwinVersionMin = .None,
 
     test_filters: []const []const u8 = &[_][]const u8{},
     test_name_prefix: ?[]const u8 = null,
 
-    emit_file_type: Emit = .Binary,
+    emit_bin: bool = true,
+    emit_asm: bool = false,
+    emit_llvm_ir: bool = false,
+    emit_h: bool = false,
 
     kind: Kind,
 
-    link_out_file: ?[]const u8 = null,
     events: *event.Channel(Event),
 
     exported_symbol_names: event.Locked(Decl.Table),
src-self-hosted/link.zig
@@ -36,21 +36,17 @@ pub fn link(comp: *Compilation) !void {
     ctx.args = std.ArrayList([*:0]const u8).init(&ctx.arena.allocator);
     ctx.link_msg = std.Buffer.initNull(&ctx.arena.allocator);
 
-    if (comp.link_out_file) |out_file| {
-        ctx.out_file_path = try std.Buffer.init(&ctx.arena.allocator, out_file);
-    } else {
-        ctx.out_file_path = try std.Buffer.init(&ctx.arena.allocator, comp.name.toSliceConst());
-        switch (comp.kind) {
-            .Exe => {
-                try ctx.out_file_path.append(comp.target.exeFileExt());
-            },
-            .Lib => {
-                try ctx.out_file_path.append(if (comp.is_static) comp.target.staticLibSuffix() else comp.target.dynamicLibSuffix());
-            },
-            .Obj => {
-                try ctx.out_file_path.append(comp.target.oFileExt());
-            },
-        }
+    ctx.out_file_path = try std.Buffer.init(&ctx.arena.allocator, comp.name.toSliceConst());
+    switch (comp.kind) {
+        .Exe => {
+            try ctx.out_file_path.append(comp.target.exeFileExt());
+        },
+        .Lib => {
+            try ctx.out_file_path.append(if (comp.is_static) comp.target.staticLibSuffix() else comp.target.dynamicLibSuffix());
+        },
+        .Obj => {
+            try ctx.out_file_path.append(comp.target.oFileExt());
+        },
     }
 
     // even though we're calling LLD as a library it thinks the first
@@ -183,37 +179,6 @@ fn constructLinkerArgsElf(ctx: *Context) !void {
         try addPathJoin(ctx, ctx.libc.static_lib_dir.?, crtbegino);
     }
 
-    //for (size_t i = 0; i < g->rpath_list.length; i += 1) {
-    //    Buf *rpath = g->rpath_list.at(i);
-    //    add_rpath(lj, rpath);
-    //}
-    //if (g->each_lib_rpath) {
-    //    for (size_t i = 0; i < g->lib_dirs.length; i += 1) {
-    //        const char *lib_dir = g->lib_dirs.at(i);
-    //        for (size_t i = 0; i < g->link_libs_list.length; i += 1) {
-    //            LinkLib *link_lib = g->link_libs_list.at(i);
-    //            if (buf_eql_str(link_lib->name, "c")) {
-    //                continue;
-    //            }
-    //            bool does_exist;
-    //            Buf *test_path = buf_sprintf("%s/lib%s.so", lib_dir, buf_ptr(link_lib->name));
-    //            if (os_file_exists(test_path, &does_exist) != ErrorNone) {
-    //                zig_panic("link: unable to check if file exists: %s", buf_ptr(test_path));
-    //            }
-    //            if (does_exist) {
-    //                add_rpath(lj, buf_create_from_str(lib_dir));
-    //                break;
-    //            }
-    //        }
-    //    }
-    //}
-
-    //for (size_t i = 0; i < g->lib_dirs.length; i += 1) {
-    //    const char *lib_dir = g->lib_dirs.at(i);
-    //    lj->args.append("-L");
-    //    lj->args.append(lib_dir);
-    //}
-
     if (ctx.comp.haveLibC()) {
         try ctx.args.append("-L");
         // TODO addNullByte should probably return [:0]u8
@@ -326,12 +291,6 @@ fn constructLinkerArgsCoff(ctx: *Context) !void {
         else => return error.UnsupportedLinkArchitecture,
     }
 
-    if (ctx.comp.windows_subsystem_windows) {
-        try ctx.args.append("/SUBSYSTEM:windows");
-    } else if (ctx.comp.windows_subsystem_console) {
-        try ctx.args.append("/SUBSYSTEM:console");
-    }
-
     const is_library = ctx.comp.kind == .Lib;
 
     const out_arg = try std.fmt.allocPrint(&ctx.arena.allocator, "-OUT:{}\x00", .{ctx.out_file_path.toSliceConst()});
@@ -374,12 +333,6 @@ fn constructLinkerArgsCoff(ctx: *Context) !void {
         try ctx.args.append("-NODEFAULTLIB");
         if (!is_library) {
             try ctx.args.append("-ENTRY:WinMainCRTStartup");
-            // TODO
-            //if (g->have_winmain) {
-            //    lj->args.append("-ENTRY:WinMain");
-            //} else {
-            //    lj->args.append("-ENTRY:WinMainCRTStartup");
-            //}
         }
     }
 
@@ -387,11 +340,6 @@ fn constructLinkerArgsCoff(ctx: *Context) !void {
         try ctx.args.append("-DLL");
     }
 
-    //for (size_t i = 0; i < g->lib_dirs.length; i += 1) {
-    //    const char *lib_dir = g->lib_dirs.at(i);
-    //    lj->args.append(buf_ptr(buf_sprintf("-LIBPATH:%s", lib_dir)));
-    //}
-
     for (ctx.comp.link_objects) |link_object| {
         const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
         try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
@@ -402,63 +350,10 @@ fn constructLinkerArgsCoff(ctx: *Context) !void {
         .Exe, .Lib => {
             if (!ctx.comp.haveLibC()) {
                 @panic("TODO");
-                //Buf *builtin_o_path = build_o(g, "builtin");
-                //lj->args.append(buf_ptr(builtin_o_path));
             }
-
-            // msvc compiler_rt is missing some stuff, so we still build it and rely on weak linkage
-            // TODO
-            //Buf *compiler_rt_o_path = build_compiler_rt(g);
-            //lj->args.append(buf_ptr(compiler_rt_o_path));
         },
         .Obj => {},
     }
-
-    //Buf *def_contents = buf_alloc();
-    //ZigList<const char *> gen_lib_args = {0};
-    //for (size_t lib_i = 0; lib_i < g->link_libs_list.length; lib_i += 1) {
-    //    LinkLib *link_lib = g->link_libs_list.at(lib_i);
-    //    if (buf_eql_str(link_lib->name, "c")) {
-    //        continue;
-    //    }
-    //    if (link_lib->provided_explicitly) {
-    //        if (lj->codegen->zig_target.env_type == ZigLLVM_GNU) {
-    //            Buf *arg = buf_sprintf("-l%s", buf_ptr(link_lib->name));
-    //            lj->args.append(buf_ptr(arg));
-    //        }
-    //        else {
-    //            lj->args.append(buf_ptr(link_lib->name));
-    //        }
-    //    } else {
-    //        buf_resize(def_contents, 0);
-    //        buf_appendf(def_contents, "LIBRARY %s\nEXPORTS\n", buf_ptr(link_lib->name));
-    //        for (size_t exp_i = 0; exp_i < link_lib->symbols.length; exp_i += 1) {
-    //            Buf *symbol_name = link_lib->symbols.at(exp_i);
-    //            buf_appendf(def_contents, "%s\n", buf_ptr(symbol_name));
-    //        }
-    //        buf_appendf(def_contents, "\n");
-
-    //        Buf *def_path = buf_alloc();
-    //        os_path_join(g->cache_dir, buf_sprintf("%s.def", buf_ptr(link_lib->name)), def_path);
-    //        os_write_file(def_path, def_contents);
-
-    //        Buf *generated_lib_path = buf_alloc();
-    //        os_path_join(g->cache_dir, buf_sprintf("%s.lib", buf_ptr(link_lib->name)), generated_lib_path);
-
-    //        gen_lib_args.resize(0);
-    //        gen_lib_args.append("link");
-
-    //        coff_append_machine_arg(g, &gen_lib_args);
-    //        gen_lib_args.append(buf_ptr(buf_sprintf("-DEF:%s", buf_ptr(def_path))));
-    //        gen_lib_args.append(buf_ptr(buf_sprintf("-OUT:%s", buf_ptr(generated_lib_path))));
-    //        Buf diag = BUF_INIT;
-    //        if (!zig_lld_link(g->zig_target.oformat, gen_lib_args.items, gen_lib_args.length, &diag)) {
-    //            fprintf(stderr, "%s\n", buf_ptr(&diag));
-    //            exit(1);
-    //        }
-    //        lj->args.append(buf_ptr(generated_lib_path));
-    //    }
-    //}
 }
 
 fn constructLinkerArgsMachO(ctx: *Context) !void {
@@ -476,32 +371,6 @@ fn constructLinkerArgsMachO(ctx: *Context) !void {
         try ctx.args.append("-dynamic");
     }
 
-    //if (is_lib) {
-    //    if (!g->is_static) {
-    //        lj->args.append("-dylib");
-
-    //        Buf *compat_vers = buf_sprintf("%" ZIG_PRI_usize ".0.0", g->version_major);
-    //        lj->args.append("-compatibility_version");
-    //        lj->args.append(buf_ptr(compat_vers));
-
-    //        Buf *cur_vers = buf_sprintf("%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize,
-    //            g->version_major, g->version_minor, g->version_patch);
-    //        lj->args.append("-current_version");
-    //        lj->args.append(buf_ptr(cur_vers));
-
-    //        // TODO getting an error when running an executable when doing this rpath thing
-    //        //Buf *dylib_install_name = buf_sprintf("@rpath/lib%s.%" ZIG_PRI_usize ".dylib",
-    //        //    buf_ptr(g->root_out_name), g->version_major);
-    //        //lj->args.append("-install_name");
-    //        //lj->args.append(buf_ptr(dylib_install_name));
-
-    //        if (buf_len(&lj->out_file) == 0) {
-    //            buf_appendf(&lj->out_file, "lib%s.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".dylib",
-    //                buf_ptr(g->root_out_name), g->version_major, g->version_minor, g->version_patch);
-    //        }
-    //    }
-    //}
-
     try ctx.args.append("-arch");
     try ctx.args.append(util.getDarwinArchString(ctx.comp.target));
 
@@ -529,12 +398,6 @@ fn constructLinkerArgsMachO(ctx: *Context) !void {
     try ctx.args.append("-o");
     try ctx.args.append(ctx.out_file_path.toSliceConst());
 
-    //for (size_t i = 0; i < g->rpath_list.length; i += 1) {
-    //    Buf *rpath = g->rpath_list.at(i);
-    //    add_rpath(lj, rpath);
-    //}
-    //add_rpath(lj, &lj->out_file);
-
     if (shared) {
         try ctx.args.append("-headerpad_max_install_names");
     } else if (ctx.comp.is_static) {
@@ -563,24 +426,12 @@ fn constructLinkerArgsMachO(ctx: *Context) !void {
         }
     }
 
-    //for (size_t i = 0; i < g->lib_dirs.length; i += 1) {
-    //    const char *lib_dir = g->lib_dirs.at(i);
-    //    lj->args.append("-L");
-    //    lj->args.append(lib_dir);
-    //}
-
     for (ctx.comp.link_objects) |link_object| {
         const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
         try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
     }
     try addFnObjects(ctx);
 
-    //// compiler_rt on darwin is missing some stuff, so we still build it and rely on LinkOnce
-    //if (g->out_type == OutTypeExe || g->out_type == OutTypeLib) {
-    //    Buf *compiler_rt_o_path = build_compiler_rt(g);
-    //    lj->args.append(buf_ptr(compiler_rt_o_path));
-    //}
-
     if (ctx.comp.target == Target.Native) {
         for (ctx.comp.link_libs_list.toSliceConst()) |lib| {
             if (mem.eql(u8, lib.name, "c")) {
@@ -613,11 +464,6 @@ fn constructLinkerArgsMachO(ctx: *Context) !void {
     } else {
         @panic("TODO");
     }
-
-    //for (size_t i = 0; i < g->darwin_frameworks.length; i += 1) {
-    //    lj->args.append("-framework");
-    //    lj->args.append(buf_ptr(g->darwin_frameworks.at(i)));
-    //}
 }
 
 fn constructLinkerArgsWasm(ctx: *Context) void {
src-self-hosted/main.zig
@@ -11,11 +11,8 @@ const Allocator = mem.Allocator;
 const ArrayList = std.ArrayList;
 const Buffer = std.Buffer;
 
-const arg = @import("arg.zig");
 const c = @import("c.zig");
 const introspect = @import("introspect.zig");
-const Args = arg.Args;
-const Flag = arg.Flag;
 const ZigCompiler = @import("compilation.zig").ZigCompiler;
 const Compilation = @import("compilation.zig").Compilation;
 const Target = std.Target;
@@ -53,11 +50,7 @@ const Command = struct {
 };
 
 pub fn main() !void {
-    // This allocator needs to be thread-safe because we use it for the event.Loop
-    // which multiplexes async functions onto kernel threads.
-    // libc allocator is guaranteed to have this property.
-    // TODO https://github.com/ziglang/zig/issues/3783
-    const allocator = std.heap.page_allocator;
+    const allocator = std.heap.c_allocator;
 
     stdout = &std.io.getStdOut().outStream().stream;
 
@@ -65,7 +58,7 @@ pub fn main() !void {
     stderr = &stderr_file.outStream().stream;
 
     const args = try process.argsAlloc(allocator);
-    // TODO I'm getting  unreachable code here, which shouldn't happen
+    // TODO I'm getting unreachable code here, which shouldn't happen
     //defer process.argsFree(allocator, args);
 
     if (args.len <= 1) {
@@ -182,8 +175,6 @@ const usage_build_generic =
     \\  --object [obj]               Add object file to build
     \\  -rdynamic                    Add all symbols to the dynamic symbol table
     \\  -rpath [path]                Add directory to the runtime library search path
-    \\  -mconsole                    (windows) --subsystem console to the linker
-    \\  -mwindows                    (windows) --subsystem windows to the linker
     \\  -framework [name]            (darwin) link against framework
     \\  -mios-version-min [ver]      (darwin) set iOS deployment target
     \\  -mmacosx-version-min [ver]   (darwin) set Mac OS X deployment target
@@ -194,143 +185,244 @@ const usage_build_generic =
     \\
 ;
 
-const args_build_generic = [_]Flag{
-    Flag.Bool("--help"),
-    Flag.Option("--color", &[_][]const u8{
-        "auto",
-        "off",
-        "on",
-    }),
-    Flag.Option("--mode", &[_][]const u8{
-        "debug",
-        "release-fast",
-        "release-safe",
-        "release-small",
-    }),
-
-    Flag.ArgMergeN("--assembly", 1),
-    Flag.Option("--emit", &[_][]const u8{
-        "asm",
-        "bin",
-        "llvm-ir",
-    }),
-    Flag.Bool("--enable-timing-info"),
-    Flag.Arg1("--libc"),
-    Flag.Arg1("--name"),
-    Flag.Arg1("--output"),
-    Flag.Arg1("--output-h"),
-    // NOTE: Parsed manually after initial check
-    Flag.ArgN("--pkg-begin", 2),
-    Flag.Bool("--pkg-end"),
-    Flag.Bool("--static"),
-    Flag.Bool("--strip"),
-    Flag.Arg1("-target"),
-    Flag.Bool("--verbose-tokenize"),
-    Flag.Bool("--verbose-ast-tree"),
-    Flag.Bool("--verbose-ast-fmt"),
-    Flag.Bool("--verbose-link"),
-    Flag.Bool("--verbose-ir"),
-    Flag.Bool("--verbose-llvm-ir"),
-    Flag.Bool("--verbose-cimport"),
-    Flag.Arg1("-dirafter"),
-    Flag.ArgMergeN("-isystem", 1),
-    Flag.Arg1("-mllvm"),
-
-    Flag.Arg1("--ar-path"),
-    Flag.Bool("--each-lib-rpath"),
-    Flag.ArgMergeN("--library", 1),
-    Flag.ArgMergeN("--forbid-library", 1),
-    Flag.ArgMergeN("--library-path", 1),
-    Flag.Arg1("--linker-script"),
-    Flag.ArgMergeN("--object", 1),
-    // NOTE: Removed -L since it would need to be special-cased and we have an alias in library-path
-    Flag.Bool("-rdynamic"),
-    Flag.Arg1("-rpath"),
-    Flag.Bool("-mconsole"),
-    Flag.Bool("-mwindows"),
-    Flag.ArgMergeN("-framework", 1),
-    Flag.Arg1("-mios-version-min"),
-    Flag.Arg1("-mmacosx-version-min"),
-    Flag.Arg1("--ver-major"),
-    Flag.Arg1("--ver-minor"),
-    Flag.Arg1("--ver-patch"),
-};
-
 fn buildOutputType(allocator: *Allocator, args: []const []const u8, out_type: Compilation.Kind) !void {
-    var flags = try Args.parse(allocator, &args_build_generic, args);
-    defer flags.deinit();
-
-    if (flags.present("help")) {
-        try stdout.write(usage_build_generic);
-        process.exit(0);
-    }
+    var color: errmsg.Color = .Auto;
+    var build_mode: std.builtin.Mode = .Debug;
+    var emit_bin = true;
+    var emit_asm = false;
+    var emit_llvm_ir = false;
+    var emit_h = false;
+    var provided_name: ?[]const u8 = null;
+    var is_dynamic = false;
+    var root_src_file: ?[]const u8 = null;
+    var libc_arg: ?[]const u8 = null;
+    var version: std.builtin.Version = .{ .major = 0, .minor = 0, .patch = 0 };
+    var linker_script: ?[]const u8 = null;
+    var strip = false;
+    var verbose_tokenize = false;
+    var verbose_ast_tree = false;
+    var verbose_ast_fmt = false;
+    var verbose_link = false;
+    var verbose_ir = false;
+    var verbose_llvm_ir = false;
+    var verbose_cimport = false;
+    var linker_rdynamic = false;
+    var macosx_version_min: ?[]const u8 = null;
+    var ios_version_min: ?[]const u8 = null;
+
+    var assembly_files = ArrayList([]const u8).init(allocator);
+    defer assembly_files.deinit();
+
+    var link_objects = ArrayList([]const u8).init(allocator);
+    defer link_objects.deinit();
 
-    const build_mode: std.builtin.Mode = blk: {
-        if (flags.single("mode")) |mode_flag| {
-            if (mem.eql(u8, mode_flag, "debug")) {
-                break :blk .Debug;
-            } else if (mem.eql(u8, mode_flag, "release-fast")) {
-                break :blk .ReleaseFast;
-            } else if (mem.eql(u8, mode_flag, "release-safe")) {
-                break :blk .ReleaseSafe;
-            } else if (mem.eql(u8, mode_flag, "release-small")) {
-                break :blk .ReleaseSmall;
-            } else unreachable;
-        } else {
-            break :blk .Debug;
-        }
-    };
+    var clang_argv_buf = ArrayList([]const u8).init(allocator);
+    defer clang_argv_buf.deinit();
 
-    const color: errmsg.Color = blk: {
-        if (flags.single("color")) |color_flag| {
-            if (mem.eql(u8, color_flag, "auto")) {
-                break :blk .Auto;
-            } else if (mem.eql(u8, color_flag, "on")) {
-                break :blk .On;
-            } else if (mem.eql(u8, color_flag, "off")) {
-                break :blk .Off;
-            } else unreachable;
-        } else {
-            break :blk .Auto;
-        }
-    };
-
-    const emit_type: Compilation.Emit = blk: {
-        if (flags.single("emit")) |emit_flag| {
-            if (mem.eql(u8, emit_flag, "asm")) {
-                break :blk .Assembly;
-            } else if (mem.eql(u8, emit_flag, "bin")) {
-                break :blk .Binary;
-            } else if (mem.eql(u8, emit_flag, "llvm-ir")) {
-                break :blk .LlvmIr;
-            } else unreachable;
-        } else {
-            break :blk .Binary;
-        }
-    };
+    var mllvm_flags = ArrayList([]const u8).init(allocator);
+    defer mllvm_flags.deinit();
 
     var cur_pkg = try CliPkg.init(allocator, "", "", null);
     defer cur_pkg.deinit();
 
-    var i: usize = 0;
-    while (i < args.len) : (i += 1) {
-        const arg_name = args[i];
-        if (mem.eql(u8, "--pkg-begin", arg_name)) {
-            // following two arguments guaranteed to exist due to arg parsing
-            i += 1;
-            const new_pkg_name = args[i];
-            i += 1;
-            const new_pkg_path = args[i];
-
-            var new_cur_pkg = try CliPkg.init(allocator, new_pkg_name, new_pkg_path, cur_pkg);
-            try cur_pkg.children.append(new_cur_pkg);
-            cur_pkg = new_cur_pkg;
-        } else if (mem.eql(u8, "--pkg-end", arg_name)) {
-            if (cur_pkg.parent) |parent| {
-                cur_pkg = parent;
+    var system_libs = ArrayList([]const u8).init(allocator);
+    defer system_libs.deinit();
+
+    var c_src_files = ArrayList([]const u8).init(allocator);
+    defer c_src_files.deinit();
+
+    {
+        var i: usize = 0;
+        while (i < args.len) : (i += 1) {
+            const arg = args[i];
+            if (mem.startsWith(u8, arg, "-")) {
+                if (mem.eql(u8, arg, "--help")) {
+                    try stdout.write(usage_build_generic);
+                    process.exit(0);
+                } else if (mem.eql(u8, arg, "--color")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected [auto|on|off] after --color\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    const next_arg = args[i];
+                    if (mem.eql(u8, next_arg, "auto")) {
+                        color = .Auto;
+                    } else if (mem.eql(u8, next_arg, "on")) {
+                        color = .On;
+                    } else if (mem.eql(u8, next_arg, "off")) {
+                        color = .Off;
+                    } else {
+                        try stderr.print("expected [auto|on|off] after --color, found '{}'\n", .{next_arg});
+                        process.exit(1);
+                    }
+                } else if (mem.eql(u8, arg, "--mode")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected [Debug|ReleaseSafe|ReleaseFast|ReleaseSmall] after --mode\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    const next_arg = args[i];
+                    if (mem.eql(u8, next_arg, "Debug")) {
+                        build_mode = .Debug;
+                    } else if (mem.eql(u8, next_arg, "ReleaseSafe")) {
+                        build_mode = .ReleaseSafe;
+                    } else if (mem.eql(u8, next_arg, "ReleaseFast")) {
+                        build_mode = .ReleaseFast;
+                    } else if (mem.eql(u8, next_arg, "ReleaseSmall")) {
+                        build_mode = .ReleaseSmall;
+                    } else {
+                        try stderr.print("expected [Debug|ReleaseSafe|ReleaseFast|ReleaseSmall] after --mode, found '{}'\n", .{next_arg});
+                        process.exit(1);
+                    }
+                } else if (mem.eql(u8, arg, "--name")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after --name\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    provided_name = args[i];
+                } else if (mem.eql(u8, arg, "--ver-major")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after --ver-major\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    version.major = try std.fmt.parseInt(u32, args[i], 10);
+                } else if (mem.eql(u8, arg, "--ver-minor")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after --ver-minor\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    version.minor = try std.fmt.parseInt(u32, args[i], 10);
+                } else if (mem.eql(u8, arg, "--ver-patch")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after --ver-patch\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    version.patch = try std.fmt.parseInt(u32, args[i], 10);
+                } else if (mem.eql(u8, arg, "--linker-script")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after --linker-script\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    linker_script = args[i];
+                } else if (mem.eql(u8, arg, "--libc")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after --libc\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    libc_arg = args[i];
+                } else if (mem.eql(u8, arg, "-mllvm")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after -mllvm\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    try clang_argv_buf.append("-mllvm");
+                    try clang_argv_buf.append(args[i]);
+
+                    try mllvm_flags.append(args[i]);
+                } else if (mem.eql(u8, arg, "-mmacosx-version-min")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after -mmacosx-version-min\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    macosx_version_min = args[i];
+                } else if (mem.eql(u8, arg, "-mios-version-min")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected parameter after -mios-version-min\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    ios_version_min = args[i];
+                } else if (mem.eql(u8, arg, "-femit-bin")) {
+                    emit_bin = true;
+                } else if (mem.eql(u8, arg, "-fno-emit-bin")) {
+                    emit_bin = false;
+                } else if (mem.eql(u8, arg, "-femit-asm")) {
+                    emit_asm = true;
+                } else if (mem.eql(u8, arg, "-fno-emit-asm")) {
+                    emit_asm = false;
+                } else if (mem.eql(u8, arg, "-femit-llvm-ir")) {
+                    emit_llvm_ir = true;
+                } else if (mem.eql(u8, arg, "-fno-emit-llvm-ir")) {
+                    emit_llvm_ir = false;
+                } else if (mem.eql(u8, arg, "-dynamic")) {
+                    is_dynamic = true;
+                } else if (mem.eql(u8, arg, "--strip")) {
+                    strip = true;
+                } else if (mem.eql(u8, arg, "--verbose-tokenize")) {
+                    verbose_tokenize = true;
+                } else if (mem.eql(u8, arg, "--verbose-ast-tree")) {
+                    verbose_ast_tree = true;
+                } else if (mem.eql(u8, arg, "--verbose-ast-fmt")) {
+                    verbose_ast_fmt = true;
+                } else if (mem.eql(u8, arg, "--verbose-link")) {
+                    verbose_link = true;
+                } else if (mem.eql(u8, arg, "--verbose-ir")) {
+                    verbose_ir = true;
+                } else if (mem.eql(u8, arg, "--verbose-llvm-ir")) {
+                    verbose_llvm_ir = true;
+                } else if (mem.eql(u8, arg, "--verbose-cimport")) {
+                    verbose_cimport = true;
+                } else if (mem.eql(u8, arg, "-rdynamic")) {
+                    linker_rdynamic = true;
+                } else if (mem.eql(u8, arg, "--pkg-begin")) {
+                    if (i + 2 >= args.len) {
+                        try stderr.write("expected [name] [path] after --pkg-begin\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    const new_pkg_name = args[i];
+                    i += 1;
+                    const new_pkg_path = args[i];
+
+                    var new_cur_pkg = try CliPkg.init(allocator, new_pkg_name, new_pkg_path, cur_pkg);
+                    try cur_pkg.children.append(new_cur_pkg);
+                    cur_pkg = new_cur_pkg;
+                } else if (mem.eql(u8, arg, "--pkg-end")) {
+                    if (cur_pkg.parent) |parent| {
+                        cur_pkg = parent;
+                    } else {
+                        try stderr.write("encountered --pkg-end with no matching --pkg-begin\n");
+                        process.exit(1);
+                    }
+                } else if (mem.startsWith(u8, arg, "-l")) {
+                    try system_libs.append(arg[2..]);
+                } else {
+                    try stderr.print("unrecognized parameter: '{}'", .{arg});
+                    process.exit(1);
+                }
+            } else if (mem.endsWith(u8, arg, ".s")) {
+                try assembly_files.append(arg);
+            } else if (mem.endsWith(u8, arg, ".o") or
+                mem.endsWith(u8, arg, ".obj") or
+                mem.endsWith(u8, arg, ".a") or
+                mem.endsWith(u8, arg, ".lib"))
+            {
+                try link_objects.append(arg);
+            } else if (mem.endsWith(u8, arg, ".c") or
+                mem.endsWith(u8, arg, ".cpp"))
+            {
+                try c_src_files.append(arg);
+            } else if (mem.endsWith(u8, arg, ".zig")) {
+                if (root_src_file) |other| {
+                    try stderr.print("found another zig file '{}' after root source file '{}'", .{
+                        arg,
+                        other,
+                    });
+                    process.exit(1);
+                } else {
+                    root_src_file = arg;
+                }
             } else {
-                try stderr.print("encountered --pkg-end with no matching --pkg-begin\n", .{});
-                process.exit(1);
+                try stderr.print("unrecognized file extension of parameter '{}'", .{arg});
             }
         }
     }
@@ -340,18 +432,8 @@ fn buildOutputType(allocator: *Allocator, args: []const []const u8, out_type: Co
         process.exit(1);
     }
 
-    const provided_name = flags.single("name");
-    const root_source_file = switch (flags.positionals.len) {
-        0 => null,
-        1 => flags.positionals.at(0),
-        else => {
-            try stderr.print("unexpected extra parameter: {}\n", .{flags.positionals.at(1)});
-            process.exit(1);
-        },
-    };
-
     const root_name = if (provided_name) |n| n else blk: {
-        if (root_source_file) |file| {
+        if (root_src_file) |file| {
             const basename = fs.path.basename(file);
             var it = mem.separate(basename, ".");
             break :blk it.next() orelse basename;
@@ -361,11 +443,7 @@ fn buildOutputType(allocator: *Allocator, args: []const []const u8, out_type: Co
         }
     };
 
-    const is_static = flags.present("static");
-
-    const assembly_files = flags.many("assembly");
-    const link_objects = flags.many("object");
-    if (root_source_file == null and link_objects.len == 0 and assembly_files.len == 0) {
+    if (root_src_file == null and link_objects.len == 0 and assembly_files.len == 0) {
         try stderr.write("Expected source file argument or at least one --object or --assembly argument\n");
         process.exit(1);
     }
@@ -375,15 +453,7 @@ fn buildOutputType(allocator: *Allocator, args: []const []const u8, out_type: Co
         process.exit(1);
     }
 
-    var clang_argv_buf = ArrayList([]const u8).init(allocator);
-    defer clang_argv_buf.deinit();
-
-    const mllvm_flags = flags.many("mllvm");
-    for (mllvm_flags) |mllvm| {
-        try clang_argv_buf.append("-mllvm");
-        try clang_argv_buf.append(mllvm);
-    }
-    try ZigCompiler.setLlvmArgv(allocator, mllvm_flags);
+    try ZigCompiler.setLlvmArgv(allocator, mllvm_flags.toSliceConst());
 
     const zig_lib_dir = introspect.resolveZigLibDir(allocator) catch process.exit(1);
     defer allocator.free(zig_lib_dir);
@@ -396,74 +466,60 @@ fn buildOutputType(allocator: *Allocator, args: []const []const u8, out_type: Co
     var comp = try Compilation.create(
         &zig_compiler,
         root_name,
-        root_source_file,
+        root_src_file,
         Target.Native,
         out_type,
         build_mode,
-        is_static,
+        !is_dynamic,
         zig_lib_dir,
     );
     defer comp.destroy();
 
-    if (flags.single("libc")) |libc_path| {
+    if (libc_arg) |libc_path| {
         parseLibcPaths(allocator, &override_libc, libc_path);
         comp.override_libc = &override_libc;
     }
 
-    for (flags.many("library")) |lib| {
+    for (system_libs.toSliceConst()) |lib| {
         _ = try comp.addLinkLib(lib, true);
     }
 
-    comp.version_major = try std.fmt.parseUnsigned(u32, flags.single("ver-major") orelse "0", 10);
-    comp.version_minor = try std.fmt.parseUnsigned(u32, flags.single("ver-minor") orelse "0", 10);
-    comp.version_patch = try std.fmt.parseUnsigned(u32, flags.single("ver-patch") orelse "0", 10);
-
+    comp.version = version;
     comp.is_test = false;
-
-    comp.linker_script = flags.single("linker-script");
-    comp.each_lib_rpath = flags.present("each-lib-rpath");
-
+    comp.linker_script = linker_script;
     comp.clang_argv = clang_argv_buf.toSliceConst();
+    comp.strip = strip;
 
-    comp.strip = flags.present("strip");
-
-    comp.verbose_tokenize = flags.present("verbose-tokenize");
-    comp.verbose_ast_tree = flags.present("verbose-ast-tree");
-    comp.verbose_ast_fmt = flags.present("verbose-ast-fmt");
-    comp.verbose_link = flags.present("verbose-link");
-    comp.verbose_ir = flags.present("verbose-ir");
-    comp.verbose_llvm_ir = flags.present("verbose-llvm-ir");
-    comp.verbose_cimport = flags.present("verbose-cimport");
+    comp.verbose_tokenize = verbose_tokenize;
+    comp.verbose_ast_tree = verbose_ast_tree;
+    comp.verbose_ast_fmt = verbose_ast_fmt;
+    comp.verbose_link = verbose_link;
+    comp.verbose_ir = verbose_ir;
+    comp.verbose_llvm_ir = verbose_llvm_ir;
+    comp.verbose_cimport = verbose_cimport;
 
     comp.err_color = color;
-    comp.lib_dirs = flags.many("library-path");
-    comp.darwin_frameworks = flags.many("framework");
-    comp.rpath_list = flags.many("rpath");
 
-    if (flags.single("output-h")) |output_h| {
-        comp.out_h_path = output_h;
-    }
-
-    comp.windows_subsystem_windows = flags.present("mwindows");
-    comp.windows_subsystem_console = flags.present("mconsole");
-    comp.linker_rdynamic = flags.present("rdynamic");
+    comp.linker_rdynamic = linker_rdynamic;
 
-    if (flags.single("mmacosx-version-min") != null and flags.single("mios-version-min") != null) {
+    if (macosx_version_min != null and ios_version_min != null) {
         try stderr.write("-mmacosx-version-min and -mios-version-min options not allowed together\n");
         process.exit(1);
     }
 
-    if (flags.single("mmacosx-version-min")) |ver| {
+    if (macosx_version_min) |ver| {
         comp.darwin_version_min = Compilation.DarwinVersionMin{ .MacOS = ver };
     }
-    if (flags.single("mios-version-min")) |ver| {
+    if (ios_version_min) |ver| {
         comp.darwin_version_min = Compilation.DarwinVersionMin{ .Ios = ver };
     }
 
-    comp.emit_file_type = emit_type;
-    comp.assembly_files = assembly_files;
-    comp.link_out_file = flags.single("output");
-    comp.link_objects = link_objects;
+    comp.emit_bin = emit_bin;
+    comp.emit_asm = emit_asm;
+    comp.emit_llvm_ir = emit_llvm_ir;
+    comp.emit_h = emit_h;
+    comp.assembly_files = assembly_files.toSliceConst();
+    comp.link_objects = link_objects.toSliceConst();
 
     comp.start();
     processBuildEvents(comp, color);
@@ -522,17 +578,6 @@ pub const usage_fmt =
     \\
 ;
 
-pub const args_fmt_spec = [_]Flag{
-    Flag.Bool("--help"),
-    Flag.Bool("--check"),
-    Flag.Option("--color", &[_][]const u8{
-        "auto",
-        "off",
-        "on",
-    }),
-    Flag.Bool("--stdin"),
-};
-
 const Fmt = struct {
     seen: event.Locked(SeenMap),
     any_error: bool,
@@ -578,30 +623,52 @@ fn cmdLibC(allocator: *Allocator, args: []const []const u8) !void {
 }
 
 fn cmdFmt(allocator: *Allocator, args: []const []const u8) !void {
-    var flags = try Args.parse(allocator, &args_fmt_spec, args);
-    defer flags.deinit();
-
-    if (flags.present("help")) {
-        try stdout.write(usage_fmt);
-        process.exit(0);
-    }
+    var color: errmsg.Color = .Auto;
+    var stdin_flag: bool = false;
+    var check_flag: bool = false;
+    var input_files = ArrayList([]const u8).init(allocator);
 
-    const color: errmsg.Color = blk: {
-        if (flags.single("color")) |color_flag| {
-            if (mem.eql(u8, color_flag, "auto")) {
-                break :blk .Auto;
-            } else if (mem.eql(u8, color_flag, "on")) {
-                break :blk .On;
-            } else if (mem.eql(u8, color_flag, "off")) {
-                break :blk .Off;
-            } else unreachable;
-        } else {
-            break :blk .Auto;
+    {
+        var i: usize = 0;
+        while (i < args.len) : (i += 1) {
+            const arg = args[i];
+            if (mem.startsWith(u8, arg, "-")) {
+                if (mem.eql(u8, arg, "--help")) {
+                    try stdout.write(usage_fmt);
+                    process.exit(0);
+                } else if (mem.eql(u8, arg, "--color")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected [auto|on|off] after --color\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    const next_arg = args[i];
+                    if (mem.eql(u8, next_arg, "auto")) {
+                        color = .Auto;
+                    } else if (mem.eql(u8, next_arg, "on")) {
+                        color = .On;
+                    } else if (mem.eql(u8, next_arg, "off")) {
+                        color = .Off;
+                    } else {
+                        try stderr.print("expected [auto|on|off] after --color, found '{}'\n", .{next_arg});
+                        process.exit(1);
+                    }
+                } else if (mem.eql(u8, arg, "--stdin")) {
+                    stdin_flag = true;
+                } else if (mem.eql(u8, arg, "--check")) {
+                    check_flag = true;
+                } else {
+                    try stderr.print("unrecognized parameter: '{}'", .{arg});
+                    process.exit(1);
+                }
+            } else {
+                try input_files.append(arg);
+            }
         }
-    };
+    }
 
-    if (flags.present("stdin")) {
-        if (flags.positionals.len != 0) {
+    if (stdin_flag) {
+        if (input_files.len != 0) {
             try stderr.write("cannot use --stdin with positional arguments\n");
             process.exit(1);
         }
@@ -628,7 +695,7 @@ fn cmdFmt(allocator: *Allocator, args: []const []const u8) !void {
         if (tree.errors.len != 0) {
             process.exit(1);
         }
-        if (flags.present("check")) {
+        if (check_flag) {
             const anything_changed = try std.zig.render(allocator, io.null_out_stream, tree);
             const code: u8 = if (anything_changed) 1 else 0;
             process.exit(code);
@@ -638,7 +705,7 @@ fn cmdFmt(allocator: *Allocator, args: []const []const u8) !void {
         return;
     }
 
-    if (flags.positionals.len == 0) {
+    if (input_files.len == 0) {
         try stderr.write("expected at least one source file argument\n");
         process.exit(1);
     }
@@ -650,11 +717,9 @@ fn cmdFmt(allocator: *Allocator, args: []const []const u8) !void {
         .color = color,
     };
 
-    const check_mode = flags.present("check");
-
     var group = event.Group(FmtError!void).init(allocator);
-    for (flags.positionals.toSliceConst()) |file_path| {
-        try group.call(fmtPath, .{ &fmt, file_path, check_mode });
+    for (input_files.toSliceConst()) |file_path| {
+        try group.call(fmtPath, .{ &fmt, file_path, check_flag });
     }
     try group.wait();
     if (fmt.any_error) {
@@ -808,8 +873,6 @@ fn cmdVersion(allocator: *Allocator, args: []const []const u8) !void {
     try stdout.print("{}\n", .{std.mem.toSliceConst(u8, c.ZIG_VERSION_STRING)});
 }
 
-const args_test_spec = [_]Flag{Flag.Bool("--help")};
-
 fn cmdHelp(allocator: *Allocator, args: []const []const u8) !void {
     try stdout.write(usage);
 }
src-self-hosted/stage1.zig
@@ -9,10 +9,7 @@ const process = std.process;
 const Allocator = mem.Allocator;
 const ArrayList = std.ArrayList;
 const Buffer = std.Buffer;
-const arg = @import("arg.zig");
 const self_hosted_main = @import("main.zig");
-const Args = arg.Args;
-const Flag = arg.Flag;
 const errmsg = @import("errmsg.zig");
 const DepTokenizer = @import("dep_tokenizer.zig").Tokenizer;
 
@@ -169,31 +166,54 @@ fn fmtMain(argc: c_int, argv: [*]const [*:0]const u8) !void {
     stderr_file = std.io.getStdErr();
     stderr = &stderr_file.outStream().stream;
 
-    const args = args_list.toSliceConst();
-    var flags = try Args.parse(allocator, &self_hosted_main.args_fmt_spec, args[2..]);
-    defer flags.deinit();
-
-    if (flags.present("help")) {
-        try stdout.write(self_hosted_main.usage_fmt);
-        process.exit(0);
-    }
-
-    const color = blk: {
-        if (flags.single("color")) |color_flag| {
-            if (mem.eql(u8, color_flag, "auto")) {
-                break :blk errmsg.Color.Auto;
-            } else if (mem.eql(u8, color_flag, "on")) {
-                break :blk errmsg.Color.On;
-            } else if (mem.eql(u8, color_flag, "off")) {
-                break :blk errmsg.Color.Off;
-            } else unreachable;
-        } else {
-            break :blk errmsg.Color.Auto;
+    const args = args_list.toSliceConst()[2..];
+
+    var color: errmsg.Color = .Auto;
+    var stdin_flag: bool = false;
+    var check_flag: bool = false;
+    var input_files = ArrayList([]const u8).init(allocator);
+
+    {
+        var i: usize = 0;
+        while (i < args.len) : (i += 1) {
+            const arg = args[i];
+            if (mem.startsWith(u8, arg, "-")) {
+                if (mem.eql(u8, arg, "--help")) {
+                    try stdout.write(self_hosted_main.usage_fmt);
+                    process.exit(0);
+                } else if (mem.eql(u8, arg, "--color")) {
+                    if (i + 1 >= args.len) {
+                        try stderr.write("expected [auto|on|off] after --color\n");
+                        process.exit(1);
+                    }
+                    i += 1;
+                    const next_arg = args[i];
+                    if (mem.eql(u8, next_arg, "auto")) {
+                        color = .Auto;
+                    } else if (mem.eql(u8, next_arg, "on")) {
+                        color = .On;
+                    } else if (mem.eql(u8, next_arg, "off")) {
+                        color = .Off;
+                    } else {
+                        try stderr.print("expected [auto|on|off] after --color, found '{}'\n", .{next_arg});
+                        process.exit(1);
+                    }
+                } else if (mem.eql(u8, arg, "--stdin")) {
+                    stdin_flag = true;
+                } else if (mem.eql(u8, arg, "--check")) {
+                    check_flag = true;
+                } else {
+                    try stderr.print("unrecognized parameter: '{}'", .{arg});
+                    process.exit(1);
+                }
+            } else {
+                try input_files.append(arg);
+            }
         }
-    };
+    }
 
-    if (flags.present("stdin")) {
-        if (flags.positionals.len != 0) {
+    if (stdin_flag) {
+        if (input_files.len != 0) {
             try stderr.write("cannot use --stdin with positional arguments\n");
             process.exit(1);
         }
@@ -217,7 +237,7 @@ fn fmtMain(argc: c_int, argv: [*]const [*:0]const u8) !void {
         if (tree.errors.len != 0) {
             process.exit(1);
         }
-        if (flags.present("check")) {
+        if (check_flag) {
             const anything_changed = try std.zig.render(allocator, io.null_out_stream, tree);
             const code = if (anything_changed) @as(u8, 1) else @as(u8, 0);
             process.exit(code);
@@ -227,7 +247,7 @@ fn fmtMain(argc: c_int, argv: [*]const [*:0]const u8) !void {
         return;
     }
 
-    if (flags.positionals.len == 0) {
+    if (input_files.len == 0) {
         try stderr.write("expected at least one source file argument\n");
         process.exit(1);
     }
@@ -239,10 +259,8 @@ fn fmtMain(argc: c_int, argv: [*]const [*:0]const u8) !void {
         .allocator = allocator,
     };
 
-    const check_mode = flags.present("check");
-
-    for (flags.positionals.toSliceConst()) |file_path| {
-        try fmtPath(&fmt, file_path, check_mode);
+    for (input_files.toSliceConst()) |file_path| {
+        try fmtPath(&fmt, file_path, check_flag);
     }
     if (fmt.any_error) {
         process.exit(1);