hokein added inline comments.
================
Comment at: clang-tools-extra/include-cleaner/lib/Analysis.cpp:100
+ // Check if main file is the public interface for a private header. If so
+ // we shouldn't diagnose it as unused.
+ if (auto PHeader = PI->getPublic(I.Resolved); !PHeader.empty()) {
----------------
The beahvior (no showing the diagnostic) seems reasonable to me as we can infer
that the included header is supposed to be exported by the main file. Just
explore this a bit more.
The sad bit is that we start diverging from the classical IWYU tool (I have
check it, for this case, it gives an unused-include unless you add an export
pragma).
I think the main cause is that we're missing the `// IWYU pragma: export`, we
should still want to recommend users to add the pragma export, right?
My only concern is that without the `export` pragma, whether the include is
used can't be reason about by just "reading" the main-file content by human,
e.g. for the case below, there is no usage of the `private.h` (previously the
trailing `// IWYU pragma: export` comment is considered a usage), we have to
open the private.h and find the private mapping to verify the usage.
```
// public.h
#include "private.h"
```
It seems better to provide an `adding //IWYU pragma: export` FIXIT.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D146406/new/
https://reviews.llvm.org/D146406
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