[cfe-dev] LibTooling question

[Mario Schwalbe]

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Hi CLANGers,

I've been playing with Clang's LibTooling classes closely following
the tutorial at http://clang.llvm.org/docs/LibTooling.html in order
to make use of clang as a frontend in our project.

However, I might need some assistence:

1. Include headers: Using the ClangTool class (like the example suggests)
   it cannot find its own headers. The documentation states:

   "Clang tools need their builtin headers and search for them the same
    way clang does. Thus, the default location to look for builtin headers
    is in a path $(dirname /path/to/tool)/../lib/clang/3.2/include relative
    to the tool binary."

   But apparently the passed pseudo argv[0] is clang-tool, and, hence, the
   invocation contains:

      -resource-dir ../lib/clang/3.1
      -internal-isystem ../lib/clang/3.1/include

   on Linux. (Windows seems to work.) It this intended behaviour?
   How can I set those paths? clang itself works. The ToolInvocation class
   as well, if I pass a reasonable path as argv[0].

2. I finally managed to run a SyntaxOnlyAction as well as PrintPreprocessedAction.
   But how can I compile a module to LLVM IR?

3. And is it possible to access the generated result (LLVM IR or preprocessed
   source code) without first writing to disk and re-reading.

Thanks in advance,
Mario
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