Initial drop

Change-Id: I987ee6af6960bf2552628ee094cd656bf9e5f2fa
Reviewed-on: https://pigweed-review.googlesource.com/c/open-dice/+/31966
Reviewed-by: Ali Zhang <[email protected]>
diff --git a/BUILDCONFIG.gn b/BUILDCONFIG.gn
new file mode 100644
index 0000000..5a2ac67
--- /dev/null
+++ b/BUILDCONFIG.gn
@@ -0,0 +1,20 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+_pigweed_directory = {
+  import("//build_overrides/pigweed.gni")
+}
+
+# The default toolchain is not used in Pigweed builds.
+set_default_toolchain("${_pigweed_directory.dir_pw_toolchain}/dummy")