[cxx-interop] Workaround name lookup issues with namespace os
#78634
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On Apple platforms, a system module `os` declares a `namespace os` under `#if defined(__cplusplus)`. This causes ClangImporter to import it as `enum os` when C++ interop is enabled. This causes name lookup ambiguity (module os vs namespace os) which is resolved in namespace's favor, breaking existing usages. rdar://119044493
egorzhdan
requested review from
zoecarver,
hyp,
Xazax-hun,
beccadax and
ian-twilightcoder
as code owners
|
@swift-ci please smoke test |
Xazax-hun
approved these changes
Jan 15, 2025
|
Yeah, this is a pure-Swift issue, #43510 – there isn't always a way to distinguish a Swift module from a Swift type when referring to them by name. |
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On Apple platforms, a system module
osdeclares anamespace osunder#if defined(__cplusplus). This causes ClangImporter to import it asenum oswhen C++ interop is enabled. This causes name lookup ambiguity (module os vs namespace os) which is resolved in namespace's favor, breaking existing usages.rdar://119044493