Make build_crate use root_out_dir as its temp.

Author: szilardszaloki

script/build_crate.py

@@ -0,0 +1,20 @@
+# Copyright (c) 2025 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import argparse
+import os
+import platform
+import subprocess
+
+parser = argparse.ArgumentParser(
+    description='Build crates in //brave/tools/crates/config.gni')
+parser.add_argument('--temp_dir_path', required=True)
+args, cargo_args = parser.parse_known_args()
+env = os.environ.copy()
+if platform.system() == "Windows":
+    env['TEMP'] = env['TMP'] = args.temp_dir_path
+else:
+    env["TMPDIR"] = args.temp_dir_path
+subprocess.check_call(cargo_args, env=env)

tools/crates/build_crate.gni

@@ -15,7 +15,7 @@ template("build_crate") {
 
     forward_variables_from(invoker, [ "deps" ])
 
-    script = "//build/gn_run_binary.py"
+    script = "//brave/script/build_crate.py"
 
     cargo_exe = "//third_party/rust-toolchain/bin/cargo"
     if (host_os == "win") {
@@ -36,6 +36,8 @@ template("build_crate") {
     #   --frozen (--locked + --offline)
     # when running `cargo build`.
     args = [
+      "--temp_dir_path",
+      rebase_path(root_out_dir),
       rebase_path(cargo_exe),
       "build",
       "--quiet",