1 files changed, 51 insertions, 1 deletions

diff --git a/build.zig b/build.zig
index 22dd7158..beeba648 100644
--- a/build.zig
+++ b/build.zig
@@ -16,6 +16,7 @@ pub fn build(b: *std.Build) void {
     const optimize = if (is_emscripten) .ReleaseSmall else requested_optimize;
     const default_grammars: TreeSitterGrammars = if (is_emscripten) .minimal else .full;
     const tree_sitter_grammars = b.option(TreeSitterGrammars, "tree-sitter", "tree-sitter grammar set: disabled, minimal, full") orelse default_grammars;
+    const tracy = b.option([]const u8, "tracy", "enable Tracy profiling; supply the path to a Tracy source checkout");
 
     // the browser shell: zig object + emcc link + html, installed to zig-out/web
     const web_step = b.step("web", "build the browser shell into zig-out/web (-Dplatform=web -Dtarget=wasm32-emscripten -Ddump=<dump.zon>)");
@@ -59,13 +60,41 @@ pub fn build(b: *std.Build) void {
     // static archives the emcc link needs beyond the zig object (grammars, SDL)
     var wasm_libs: std.ArrayList(std.Build.LazyPath) = .empty;
 
+    // forkpty: in libc proper on glibc>=2.34 and darwin; the BSDs keep it in libutil
+    if (target.result.os.tag == .freebsd or target.result.os.tag == .netbsd or target.result.os.tag == .openbsd)
+        root_mod.linkSystemLibrary("util", .{});
+
     const opts = b.addOptions();
     opts.addOption(Platform, "platform", platform);
     opts.addOption(bool, "syntax_highlighting", tree_sitter_grammars != .disabled);
     opts.addOption(bool, "syntax_minimal_grammars", tree_sitter_grammars != .disabled);
     opts.addOption(bool, "syntax_full_grammars", tree_sitter_grammars == .full);
+    opts.addOption(bool, "enable_tracy", tracy != null);
     root_mod.addOptions("pardes_config", opts);
 
+    // Tracy zones (src/tracy.zig): compile the client into the binary only when
+    // -Dtracy=<path> names a Tracy checkout; otherwise every zone is a no-op.
+    // Sampling/callstacks/system tracing stay off: tracy's symbol worker
+    // SIGSEGVs on this binary's debug info, and its crash handler then parks
+    // every thread — the app wedges before the first frame. Zones don't need
+    // any of it.
+    if (tracy) |tracy_path| {
+        root_mod.addIncludePath(.{ .cwd_relative = tracy_path });
+        root_mod.addCSourceFile(.{
+            .file = .{ .cwd_relative = b.pathJoin(&.{ tracy_path, "public", "TracyClient.cpp" }) },
+            .flags = &.{
+                "-DTRACY_ENABLE=1",
+                "-DTRACY_NO_SAMPLING",
+                "-DTRACY_NO_CALLSTACK",
+                "-DTRACY_NO_SYSTEM_TRACING",
+                "-DTRACY_NO_CRASH_HANDLER",
+                "-DTRACY_NO_CODE_TRANSFER",
+                "-fno-sanitize=undefined",
+            },
+        });
+        root_mod.link_libcpp = true;
+    }
+
     // tree-sitter: the zig bindings + C runtime, one static lib per grammar,
     // and each grammar's highlights.scm slurped at build time into the
     // ts_queries options module (codegen consumed by comptime in syntax.zig).
@@ -171,7 +200,26 @@ pub fn build(b: *std.Build) void {
     }).module("vaxis");
 
     var ghostty_vt_for_snap: ?*std.Build.Module = null;
-    if (b.lazyDependency("ghostty", .{ .simd = target.result.os.tag != .emscripten })) |dep| {
+    // ghostty's simd libs (simdutf/highway, C++) locate the Apple SDK via
+    // xcrun on darwin targets, so cross-compiling to macOS from elsewhere
+    // uses the scalar fallback (the same configuration the web shell ships).
+    // Native/cross builds hand ghostty the real target (it defaults to the
+    // host otherwise); the web path keeps its original no-target fetch, whose
+    // zig object never uses ghostty's artifacts.
+    // NOTE: darwin targets also need two one-line zig-0.16 fixes in the
+    // pinned ghostty (applied in the zig-pkg cache; re-apply after a fresh
+    // fetch, or bump the pin once upstream carries them):
+    //   src/os/mach.zig — std.heap.next_mmap_addr_hint is gone (make the hint
+    //     var module-local) and posix.mmap prot is now a packed struct
+    //     (.{ .READ = true, .WRITE = true });
+    //   src/terminal/kitty/graphics_image.zig:185 — shm_open's variadic mode
+    //     literal 0 must be @as(std.c.mode_t, 0).
+    const ghostty_simd = !target.result.os.tag.isDarwin() or b.graph.host.result.os.tag.isDarwin();
+    const ghostty_dep = if (is_emscripten)
+        b.lazyDependency("ghostty", .{ .simd = false })
+    else
+        b.lazyDependency("ghostty", .{ .target = target, .optimize = optimize, .simd = ghostty_simd });
+    if (ghostty_dep) |dep| {
         const ghostty_vt = dep.module("ghostty-vt");
         ghostty_vt_for_snap = ghostty_vt;
         ghostty_vt.addImport("uucode", uucode_mod);
@@ -309,6 +357,8 @@ pub fn build(b: *std.Build) void {
             }),
         });
         if (ghostty_vt_for_snap) |vt| snap.root_module.addImport("ghostty-vt", vt);
+        if (target.result.os.tag == .freebsd or target.result.os.tag == .netbsd or target.result.os.tag == .openbsd)
+            snap.root_module.linkSystemLibrary("util", .{});
         b.installArtifact(snap);
         const run_snap = b.addRunArtifact(snap);
         run_snap.addArtifactArg(exe);