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fahadnayyar 720406fdd6 Diagnose unannotated C++ APIs returning SWIFT_SHARED_REFERENCE at Swift call sites (#83025 )

This patch improves the warning for C++ APIs returning
`SWIFT_SHARED_REFERENCE` types but not annotated with either
`SWIFT_RETURNS_RETAINED` or `SWIFT_RETURNS_UNRETAINED` in the following
ways:

1. The warning for missing `SWIFT_RETURNS_(UN)RETAINED` annotations is
now emitted on Swift use sites, rather than while importing the API
(func/method decls).
- This logic is now implemented as a Misl Diagnostic in function
`diagnoseCxxFunctionCalls` in file lib/Sema/MiscDiagnostics.cpp.
- The warning is now triggered only when the API is actually used, which
reduces noise in large C++ headers.
- These warnings are still gated behind experimental-feature-flag `WarnUnannotatedReturnOfCxxFrt`

rdar://150800115

2025-08-25 14:44:25 -07:00

BuiltinMappedTypes.def

[cxx-interop] Support char8_t C++20 type

2024-09-27 13:56:03 +01:00

ClangImporter.h

Diagnose unannotated C++ APIs returning SWIFT_SHARED_REFERENCE at Swift call sites (#83025 )

2025-08-25 14:44:25 -07:00

ClangImporterRequests.h

[cxx-interop] Shared references are considered safe

2025-06-13 15:41:51 +01:00

ClangImporterTypeIDZone.def

[cxx-interop] Shared references are considered safe