[cxx-interop] Put RETURNS_RETAINED warnings in a diagnostic group #85021
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…d add it to a diagnostic group This change makes the warning for unannotated C++ functions returning foreign reference types (FRT) enabled by default, improving memory safety for Swift/C++ interop users. Also added CxxForeignReferenceType diagnostic group for better control
- Delete baseline language feature WarnUnannotatedReturnOfCxxFrt,
which won't really be useful to users
- Remove some references to "cxx", since FRTs are not exclusively
imported from C++
- Clean up lit test RUN lines to use %{fs-sep}
j-hui
requested review from
DougGregor,
Xazax-hun,
egorzhdan,
fahadnayyar,
hborla,
hnrklssn,
slavapestov,
susmonteiro,
xedin and
zoecarver
as code owners
Xazax-hun
approved these changes
Oct 22, 2025
hnrklssn
approved these changes
Oct 22, 2025
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Several changes:
- shorten the warning at the call-site of unannotated functions that
return FRTS
- place the call to action ("annotate 'X' with 'Y'") at the diagnostic
note attached to the unannotated callee, where the annotation should
be made
- re-word the foreign-reference-type.md documentation to (1) reflect the
diagnostic wording change, (2) give a little bit more background about
why the annotations are needed, and (3) not be specific to C++ (since
we can import FRTs from C as well)
…rop mode rdar://144976203
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This PR rebases and addresses feedback from #84759 and includes some additional refinements:
rdar://161932849
rdar://144976203