[cfe-dev] Can clangtool handle "-I"?

[Yafei Liu via cfe-dev]

I'm writing a tool using AST matcher, and I need to pass the path of the
clang built-in heads to my tool (or it will error me that "'stddef.h' file
not found"), so I add `-I/path/to/the/headers` to my tool, but the program
said that "Unknown command line argument
'-I/usr/lib/llvm-6.0/lib/clang/6.0.0/include'."

So is there any built-in OptionCategory that can handle "-I" parameters?
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