2 files changed, 27 insertions, 2 deletions

diff --git a/lib/std/build.zig b/lib/std/build.zig
index a76e2b6327..dacfaf5f75 100644
--- a/lib/std/build.zig
+++ b/lib/std/build.zig
@@ -61,6 +61,7 @@ pub const Builder = struct {
     installed_files: ArrayList(InstalledFile),
     build_root: []const u8,
     cache_root: []const u8,
+    global_cache_root: []const u8,
     release_mode: ?builtin.Mode,
     is_release: bool,
     override_lib_dir: ?[]const u8,
@@ -126,6 +127,7 @@ pub const Builder = struct {
         zig_exe: []const u8,
         build_root: []const u8,
         cache_root: []const u8,
+        global_cache_root: []const u8,
     ) !*Builder {
         const env_map = try allocator.create(BufMap);
         env_map.* = try process.getEnvMap(allocator);
@@ -135,6 +137,7 @@ pub const Builder = struct {
             .zig_exe = zig_exe,
             .build_root = build_root,
             .cache_root = try fs.path.relative(allocator, build_root, cache_root),
+            .global_cache_root = global_cache_root,
             .verbose = false,
             .verbose_tokenize = false,
             .verbose_ast = false,
@@ -1128,7 +1131,13 @@ test "builder.findProgram compiles" {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
 
-    const builder = try Builder.create(&arena.allocator, "zig", "zig-cache", "zig-cache");
+    const builder = try Builder.create(
+        &arena.allocator,
+        "zig",
+        "zig-cache",
+        "zig-cache",
+        "zig-cache",
+    );
     defer builder.destroy();
     _ = builder.findProgram(&[_][]const u8{}, &[_][]const u8{}) catch null;
 }
@@ -2196,6 +2205,9 @@ pub const LibExeObjStep = struct {
         try zig_args.append("--cache-dir");
         try zig_args.append(builder.pathFromRoot(builder.cache_root));
 
+        try zig_args.append("--global-cache-dir");
+        try zig_args.append(builder.pathFromRoot(builder.global_cache_root));
+
         zig_args.append("--name") catch unreachable;
         zig_args.append(self.name) catch unreachable;
 
@@ -2826,6 +2838,7 @@ test "Builder.dupePkg()" {
         "test",
         "test",
         "test",
+        "test",
     );
     defer builder.destroy();
 
@@ -2869,6 +2882,7 @@ test "LibExeObjStep.addBuildOption" {
         "test",
         "test",
         "test",
+        "test",
     );
     defer builder.destroy();
 
@@ -2906,6 +2920,7 @@ test "LibExeObjStep.addPackage" {
         "test",
         "test",
         "test",
+        "test",
     );
     defer builder.destroy();
 
diff --git a/lib/std/special/build_runner.zig b/lib/std/special/build_runner.zig
index b6e8f27b12..7d9ac17499 100644
--- a/lib/std/special/build_runner.zig
+++ b/lib/std/special/build_runner.zig
@@ -41,8 +41,18 @@ pub fn main() !void {
         warn("Expected third argument to be cache root directory path\n", .{});
         return error.InvalidArgs;
     };
+    const global_cache_root = nextArg(args, &arg_idx) orelse {
+        warn("Expected third argument to be global cache root directory path\n", .{});
+        return error.InvalidArgs;
+    };
 
-    const builder = try Builder.create(allocator, zig_exe, build_root, cache_root);
+    const builder = try Builder.create(
+        allocator,
+        zig_exe,
+        build_root,
+        cache_root,
+        global_cache_root,
+    );
     defer builder.destroy();
 
     var targets = ArrayList([]const u8).init(allocator);