Frontend: Temporarily downgrade error_module_interface_requires_language_mode
#84307
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…uage_mode'. Downgrade the new error in swiftlang#84244 to a warning. The PR smoke test build is using a different build system that is failing to pass `-swift-version` arguments when building various stdlib modules. That needs to be fixed, but for now we also need to unblock CI.
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@swift-ci please smoke test |
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Sep 16, 2025
If a .swiftinterface file does not include an explicit `-language-mode` option (or its predecessor `-swift-version`) and needs to be built as a dependency of a client compilation, then the invocation to build the module from interface would end up inheriting the language mode that the client code is built with. This can result in spurious type checking diagnostics or even mis-compilation. To ensure that a module interface is always built using the language mode that its source code was originally built with, require an explicit `-language-mode` option when emitting swiftinterface files. In swiftlang#84307 this diagnostic was downgraded to a warning. The failures it caused in PR testing should now be resolved. Resolves rdar://145168219.
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Downgrade the new error in #84244 to a warning.
The PR smoke test build is using a different build system that is failing to pass
-swift-versionarguments when building various stdlib modules. That needs to be fixed, but for now we also need to unblock CI.