Reproducible by the same steps mentioned in the description for Chatto project.
P.S. Chatto is part of Swift Source Compatibility Suite and, usually, it helps us to catch problems in advance. Maybe this is a good idea to have a set of checks but for the module stability feature as well.
I have a barebones sample project that reproduces the issue. It includes pre-built binaries for easier testing, and is simpler relative to Chatto that dive (JIRA User) linked above, and self-contained unlike the sample project from the original bug posting.
Does anyone on the Swift team have insight into whether this issue is on anybody's radar for investigation?
Environment
macOS 10.14.6
Xcode 11.1 (11A1027) and 11.2 (11B52)
Additional Detail from JIRA
md5: f1ed38a9dc02b014c38a882d29cd14c2
Issue Description:
I built framework with `BUILD_LIBRARY_FOR_DISTRIBUTION` parameter to support module stability on Swift 5.1.
But in Swift 5.1.2, cannot import that framework with below errors in swiftinterface file.
Failed to load module 'Eureka'
Unknown attribute '_staticInitializeObjCMetadata'
Redundant conformance of 'AreaRow<Cell>' to protocol 'FormatterConformance'
Reproducible project
https://github.com/r-plus/modulestabilitytest
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