[cfe-dev] Using libclang to build an LLVM Module from a Transform Pass?

[Zhang via cfe-dev]

Hi:
Frontend noob here. I was attempting to play around with libclang and build another IR Module at transform stage.
Currently the solution I could think of is like this:
- Use __attribute__((constructor)) to obtain raw arguments passed to CFE
- Somehow use the arguments to build a CompilerInstance object
- Run the frontend action EmitLLVMOnly and extract the build module


I'm not sure if this is the correct/easiest way to go or I screwed up something fundamentally. And if is the way to go, I failed to find any method to clean up the all the frontend input files and leave everything else intact. Any feedback is welcome.


Zhang
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