add support for -d explain to help debug why rules are running

1 files changed, 15 insertions, 0 deletions

diff --git a/src/explain.cc b/src/explain.cc
new file mode 100644
index 0000000..4e14c25
--- /dev/null
+++ b/src/explain.cc
@@ -0,0 +1,15 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// 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
+//
+//     http://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.
+
+bool g_explaining = false;