[6.0] modulewrap: Disable ObjC interop by default on non-Darwin platforms #73778
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0a5653d started to call `IGM.finalize()`, which leads the Clang instance to emit ObjC metadata sections when the ObjC interop is enabled. Emitting ObjC metadata sections is not well supported on non-Darwin platforms and causes crashes for WebAssembly and COFF object formats[^1]. modulewrap tool did not configure the ObjC interop option, so it always enabled the ObjC interop. This patch aligns the default ObjC interop value with other tools by disabling it on non-Darwin platforms. [^1]: https://github.com/apple/llvm-project/blob/stable/20230725/clang/lib/CodeGen/CGObjCMac.cpp#L5068-L5074
kateinoigakukun added 🍒 release cherry pick 
| @swift-ci test |
| @swift-ci test WebAssembly |
al45tair approved these changes May 22, 2024
| @hborla For branch manager approval 🙏 |
bnbarham approved these changes May 29, 2024
| Thanks @bnbarham! |
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Explanation: Fixes crash regression on modulewrap with WebAssembly target by disabling ObjC interop by default on non-Darwin platforms as swift-frontend does. The crash was introduced by #73371
Scope: Only affects non-Darwin platforms
Risk: Low; just applies the same ObjC interop availability rule to modulewrap as swift-frtonend does
Testing: CI testing
Reviewer: @MaxDesiatov
Original PR: #73440