NoQ added a comment.
It sounds like the code is querying the temporary internal state of the
preprocessor which is supposed to be queried during preprocessing, not after
it. Say, `PP.isMacroDefined("__STDC_LIB_EXT1__")` clearly depends on the
location, as a macro can be un-defined and re-defined as many times as
possible. But it doesn't receive the location as an argument, so it's probably
implied to be "the location that the preprocessor is currently
preprocessing"(?) Like, i've no idea how does the `Preprocessor` class work,
but the code clearly looks too primitive to solve the problem. Clang-Tidy's
`PPCallbacks` subsystem looks much more realistic.
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D69731/new/
https://reviews.llvm.org/D69731
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