From b32a38ad2753df8df40008e279fb9f645de29c47 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Fri, 2 Jan 2026 22:02:40 -0800
Subject: [PATCH] build: fix file system watching compilation on macOS

---
 lib/compiler/build_runner.zig |  2 +-
 lib/std/Build/Watch.zig       | 21 +++++++++++----------
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/lib/compiler/build_runner.zig b/lib/compiler/build_runner.zig
index 0d18d835a4295550f304f1dd1c854e20e6538f89..82fc696618893810090a42a104de7a3e35611560 100644
--- a/lib/compiler/build_runner.zig
+++ b/lib/compiler/build_runner.zig
@@ -544,7 +544,7 @@ pub fn main(init: process.Init.Minimal) !void {
     var w: Watch = w: {
         if (!watch) break :w undefined;
         if (!Watch.have_impl) fatal("--watch not yet implemented for {t}", .{builtin.os.tag});
-        break :w try .init();
+        break :w try .init(graph.cache.cwd);
     };
 
     const now = Io.Clock.Timestamp.now(io, .awake) catch |err| fatal("failed to collect timestamp: {t}", .{err});
diff --git a/lib/std/Build/Watch.zig b/lib/std/Build/Watch.zig
index 9042241b5539935956f79d86c1306764f428c8ad..0a0178a018b535f5d06c11275c87753a4a6aef2d 100644
--- a/lib/std/Build/Watch.zig
+++ b/lib/std/Build/Watch.zig
@@ -99,7 +99,8 @@ const Os = switch (builtin.os.tag) {
             };
         };
 
-        fn init() !Watch {
+        fn init(cwd_path: []const u8) !Watch {
+            _ = cwd_path;
             return .{
                 .dir_table = .{},
                 .dir_count = 0,
@@ -427,7 +428,8 @@ const Os = switch (builtin.os.tag) {
             }
         };
 
-        fn init() !Watch {
+        fn init(cwd_path: []const u8) !Watch {
+            _ = cwd_path;
             return .{
                 .dir_table = .{},
                 .dir_count = 0,
@@ -658,14 +660,13 @@ const Os = switch (builtin.os.tag) {
         const EV = std.c.EV;
         const NOTE = std.c.NOTE;
 
-        fn init() !Watch {
-            const kq_fd = try posix.kqueue();
-            errdefer posix.close(kq_fd);
+        fn init(cwd_path: []const u8) !Watch {
+            _ = cwd_path;
             return .{
                 .dir_table = .{},
                 .dir_count = 0,
                 .os = .{
-                    .kq_fd = kq_fd,
+                    .kq_fd = try posix.kqueue(),
                     .handles = .empty,
                 },
                 .generation = 0,
@@ -841,9 +842,9 @@ const Os = switch (builtin.os.tag) {
     .macos => struct {
         fse: FsEvents,
 
-        fn init() !Watch {
+        fn init(cwd_path: []const u8) !Watch {
             return .{
-                .os = .{ .fse = try .init() },
+                .os = .{ .fse = try .init(cwd_path) },
                 .dir_count = 0,
                 .dir_table = undefined,
                 .generation = undefined,
@@ -863,8 +864,8 @@ const Os = switch (builtin.os.tag) {
     else => void,
 };
 
-pub fn init() !Watch {
-    return Os.init();
+pub fn init(cwd_path: []const u8) !Watch {
+    return Os.init(cwd_path);
 }
 
 pub const Match = struct {
-- 
2.54.0