67a11290df
`-H` displays a tree of included header files, but that tree is supposed to omit two categories of header files: 1. Any header files pulled in via `-include`, which the code refers to as the "predefines". 2. Any header files whose inclusion was skipped because they'd already been included (assuming header guards or `#pragma once`). `-fshow-skipped-includes` was intended to make `-H` display the second category of files. It wasn't checking for the first category, however, so you could end up with only the middle of the `-include` hierarchy displayed, e.g. the added test would previously output: ``` ... /data/users/smeenai/llvm-project/clang/test/Frontend/Inputs/test2.h . /data/users/smeenai/llvm-project/clang/test/Frontend/Inputs/test.h ``` This diff adds a check to prevent that and correctly omit headers from `-include` even when `-fshow-skipped-includes` is passed. While I'm here, add tests for the interaction between `-fshow-skipped-includes` and `-sys-header-deps` as well. Reviewed By: hans Differential Revision: https://reviews.llvm.org/D153175
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