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-rw-r--r--src/debug_flags.h29
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diff --git a/src/debug_flags.h b/src/debug_flags.h
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+// 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.
+
+#ifndef NINJA_EXPLAIN_H_
+#define NINJA_EXPLAIN_H_
+
+#include <stdio.h>
+
+#define EXPLAIN(fmt, ...) { \
+ if (g_explaining) \
+ fprintf(stderr, "ninja explain: " fmt "\n", __VA_ARGS__); \
+}
+
+extern bool g_explaining;
+
+extern bool g_keep_rsp;
+
+#endif // NINJA_EXPLAIN_H_