Header files are not excluded when they do not declare any types

If a file is included in excludedHeaderFiles but doesn’t declare any types or functions, it will not be excluded. This is a problem when the header file is including other header files that do declare types.

A good example of this is windows.h. It doesn’t declare any types itself, but includes quite a few headers that will be visited during ExploreTranslationUnit.

An easy way to replicate the issue is to do the following:

// Library.h
#include "ParentHeader.h"

// ParentHeader.h
#include "ChildHeader.h"

// ChildHeader.h
struct MyStruct
{
    int x;
    int y;
}

// config.json
{
  "inputFilePath": "Library.h",
  "outputFilePath": "Library.cs",
  "excludedHeaderFiles": ["ParentHeader.h"]
}

In the example above, MyStruct will be generated in Library.cs.

Alternatively on windows, just try to #include <windows.h> and "excludeHeaderFiles": ["windows.h"]

[lithiumtoast]

I’ll add the test case to the integration test when the multi-pass branch is merged.

[lithiumtoast]

@waldnercharles I fixed this and added a test for it for regression. See pull request #94.