1 files changed, 18 insertions, 32 deletions
diff --git a/lib/std/Build/Module.zig b/lib/std/Build/Module.zig
index 757f51f933..12b55a8c29 100644
--- a/lib/std/Build/Module.zig
+++ b/lib/std/Build/Module.zig
@@ -173,39 +173,25 @@ pub const IncludeDir = union(enum) {
         zig_args: *std.ArrayList([]const u8),
         asking_step: ?*Step,
     ) !void {
-        switch (include_dir) {
-            .path => |include_path| {
-                try zig_args.appendSlice(&.{ "-I", include_path.getPath2(b, asking_step) });
+        const flag: []const u8, const lazy_path: LazyPath = switch (include_dir) {
+            // zig fmt: off
+            .path                  => |lp|   .{ "-I",          lp },
+            .path_system           => |lp|   .{ "-isystem",    lp },
+            .path_after            => |lp|   .{ "-idirafter",  lp },
+            .framework_path        => |lp|   .{ "-F",          lp },
+            .framework_path_system => |lp|   .{ "-iframework", lp },
+            .config_header_step    => |ch|   .{ "-I",          ch.getOutputDir() },
+            .other_step            => |comp| .{ "-I",          comp.installed_headers_include_tree.?.getDirectory() },
+            // zig fmt: on
+            .embed_path => |lazy_path| {
+                // Special case: this is a single arg.
+                const resolved = lazy_path.getPath3(b, asking_step);
+                const arg = b.fmt("--embed-dir={}", .{resolved});
+                return zig_args.append(arg);
             },
-            .path_system => |include_path| {
-                try zig_args.appendSlice(&.{ "-isystem", include_path.getPath2(b, asking_step) });
-            },
-            .path_after => |include_path| {
-                try zig_args.appendSlice(&.{ "-idirafter", include_path.getPath2(b, asking_step) });
-            },
-            .framework_path => |include_path| {
-                try zig_args.appendSlice(&.{ "-F", include_path.getPath2(b, asking_step) });
-            },
-            .framework_path_system => |include_path| {
-                try zig_args.appendSlice(&.{ "-iframework", include_path.getPath2(b, asking_step) });
-            },
-            .other_step => |other| {
-                if (other.generated_h) |header| {
-                    try zig_args.appendSlice(&.{ "-isystem", std.fs.path.dirname(header.getPath()).? });
-                }
-                if (other.installed_headers_include_tree) |include_tree| {
-                    try zig_args.appendSlice(&.{ "-I", include_tree.generated_directory.getPath() });
-                }
-            },
-            .config_header_step => |config_header| {
-                const full_file_path = config_header.output_file.getPath();
-                const header_dir_path = full_file_path[0 .. full_file_path.len - config_header.include_path.len];
-                try zig_args.appendSlice(&.{ "-I", header_dir_path });
-            },
-            .embed_path => |embed_path| {
-                try zig_args.append(try std.mem.concat(b.allocator, u8, &.{ "--embed-dir=", embed_path.getPath2(b, asking_step) }));
-            },
-        }
+        };
+        const resolved_str = try lazy_path.getPath3(b, asking_step).toString(b.graph.arena);
+        return zig_args.appendSlice(&.{ flag, resolved_str });
     }
 };