Fix possible parsing of same rc file multiple times.
Write a new function that dedupes a set of paths using its canonical
form and use it to remove possible duplicates in the set of rc files
that will be parsed.
PiperOrigin-RevId: 152489149
diff --git a/src/main/cpp/option_processor-internal.h b/src/main/cpp/option_processor-internal.h
new file mode 100644
index 0000000..d53b03e
--- /dev/null
+++ b/src/main/cpp/option_processor-internal.h
@@ -0,0 +1,34 @@
+// Copyright 2017 The Bazel Authors. 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 THIRD_PARTY_BAZEL_SRC_MAIN_CPP_OPTION_PROCESSOR_INTERNAL_H_
+#define THIRD_PARTY_BAZEL_SRC_MAIN_CPP_OPTION_PROCESSOR_INTERNAL_H_
+
+#include <algorithm>
+
+#include "src/main/cpp/util/file.h"
+
+namespace blaze {
+namespace internal {
+
+// Returns the deduped set of blazerc paths (with respect to its canonical form)
+// preserving the original order. The paths that cannot be resolved are
+// omitted.
+std::vector<std::string> DedupeBlazercPaths(
+ const std::vector<std::string>& paths);
+
+} // namespace internal
+} // namespace blaze
+
+#endif // THIRD_PARTY_BAZEL_SRC_MAIN_CPP_OPTION_PROCESSOR_INTERNAL_H_
