add a module for working with MSVC (cl.exe) behavior

This will be needed for performant builds on Windows.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/msvc_helper.h b/src/msvc_helper.h
new file mode 100644
index 0000000..e7c2b1a
--- /dev/null
+++ b/src/msvc_helper.h
@@ -0,0 +1,29 @@
+// Copyright 2011 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.
+
+#include <string>
+#include <vector>
+using namespace std;
+
+struct StringPiece;
+
+/// Visual Studio's cl.exe requires some massaging to work with Ninja;
+/// for example, it emits include information on stderr in a funny
+/// format when building with /showIncludes.  This class wraps a CL
+/// process and parses that output to extract the file list.
+struct CLWrapper {
+  /// Parse a line of cl.exe output and extract /showIncludes info.
+  /// If a dependency is extracted, returns a nonempty string.
+  static string FilterShowIncludes(const string& line);
+};