build: do not build/link harfbuzz on macOS

build.zig

@@ -1055,11 +1055,14 @@ fn addDeps(
         "fontconfig",
         fontconfig_dep.module("fontconfig"),
     );
+    if (config.font_backend.hasHarfbuzz()) step.root_module.addImport(
+        "harfbuzz",
+        harfbuzz_dep.module("harfbuzz"),
+    );
     step.root_module.addImport("oniguruma", oniguruma_dep.module("oniguruma"));
     step.root_module.addImport("freetype", freetype_dep.module("freetype"));
     step.root_module.addImport("glslang", glslang_dep.module("glslang"));
     step.root_module.addImport("spirv_cross", spirv_cross_dep.module("spirv_cross"));
-    step.root_module.addImport("harfbuzz", harfbuzz_dep.module("harfbuzz"));
     step.root_module.addImport("xev", libxev_dep.module("xev"));
     step.root_module.addImport("opengl", opengl_dep.module("opengl"));
     step.root_module.addImport("pixman", pixman_dep.module("pixman"));
@@ -1110,7 +1113,6 @@ fn addDeps(
         step.addIncludePath(freetype_dep.path(""));
         step.linkSystemLibrary2("bzip2", dynamic_link_opts);
         step.linkSystemLibrary2("freetype2", dynamic_link_opts);
-        step.linkSystemLibrary2("harfbuzz", dynamic_link_opts);
         step.linkSystemLibrary2("libpng", dynamic_link_opts);
         step.linkSystemLibrary2("oniguruma", dynamic_link_opts);
         step.linkSystemLibrary2("pixman-1", dynamic_link_opts);
@@ -1119,6 +1121,9 @@ fn addDeps(
         if (config.font_backend.hasFontconfig()) {
             step.linkSystemLibrary2("fontconfig", dynamic_link_opts);
         }
+        if (config.font_backend.hasHarfbuzz()) {
+            step.linkSystemLibrary2("harfbuzz", dynamic_link_opts);
+        }
     }
 
     // Other dependencies, we may dynamically link
@@ -1136,14 +1141,16 @@ fn addDeps(
         step.linkLibrary(freetype_dep.artifact("freetype"));
         try static_libs.append(freetype_dep.artifact("freetype").getEmittedBin());
 
-        // Harfbuzz
-        step.linkLibrary(harfbuzz_dep.artifact("harfbuzz"));
-        try static_libs.append(harfbuzz_dep.artifact("harfbuzz").getEmittedBin());
-
         // Pixman
         step.linkLibrary(pixman_dep.artifact("pixman"));
         try static_libs.append(pixman_dep.artifact("pixman").getEmittedBin());
 
+        // Harfbuzz
+        if (config.font_backend.hasHarfbuzz()) {
+            step.linkLibrary(harfbuzz_dep.artifact("harfbuzz"));
+            try static_libs.append(harfbuzz_dep.artifact("harfbuzz").getEmittedBin());
+        }
+
         // Only Linux gets fontconfig
         if (config.font_backend.hasFontconfig()) {
             // Fontconfig

src/font/face/coretext.zig

@@ -28,7 +28,7 @@ pub const Face = struct {
 
     /// True if our build is using Harfbuzz. If we're not, we can avoid
     /// some Harfbuzz-specific code paths.
-    const harfbuzz_shaper = font.Shaper == font.shape.harfbuzz.Shaper;
+    const harfbuzz_shaper = font.options.backend.hasHarfbuzz();
 
     /// The matrix applied to a regular font to auto-italicize it.
     pub const italic_skew = macos.graphics.AffineTransform{

src/font/main.zig

@@ -115,6 +115,19 @@ pub const Backend = enum {
             => false,
         };
     }
+
+    pub fn hasHarfbuzz(self: Backend) bool {
+        return switch (self) {
+            .freetype,
+            .fontconfig_freetype,
+            .coretext_freetype,
+            => true,
+
+            .coretext,
+            .web_canvas,
+            => false,
+        };
+    }
 };
 
 /// The styles that a family can take.

src/main_ghostty.zig

@@ -256,7 +256,9 @@ pub const GlobalState = struct {
         std.log.info("ghostty build optimize={s}", .{build_config.mode_string});
         std.log.info("runtime={}", .{build_config.app_runtime});
         std.log.info("font_backend={}", .{build_config.font_backend});
-        std.log.info("dependency harfbuzz={s}", .{harfbuzz.versionString()});
+        if (comptime build_config.font_backend.hasHarfbuzz()) {
+            std.log.info("dependency harfbuzz={s}", .{harfbuzz.versionString()});
+        }
         if (comptime build_config.font_backend.hasFontconfig()) {
             std.log.info("dependency fontconfig={d}", .{fontconfig.version()});
         }