https://bugs.llvm.org/show_bug.cgi?id=37990
Bug ID: 37990
Summary: -frewrite-includes doesn't handle __has_include in
macro expansion
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
I was trying to get a reduced test case for a crash in libc++ and QtBase but I
couldn't use clang -cc1 on the preprocessed source. It would fail with
compilation errors instead of the assertion I was trying to track down.
It turns out that both of these projects have a custom macro wrapping
__has_include()
and -frewrite-includes does not rewrite that to 0 or 1 so the invocation fails
on the rewritten source.
I have added a local hack to handle the Qt and libc++ macro names in
https://github.com/CTSRD-CHERI/clang/commit/05aafbf0c6cd7099b7d53466b58a8b8214d29f33
but I guess a real fix is needed instead. If people are interested I'm happy to
put it up for review. Especially the libc++ macro is probably used in lots of
crash reproducers so it might help with getting a reduced test case from
C++-specific crashes.
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