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[wasm] Fix ambiguous errno error when importing WASILibc module #75747

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Aug 7, 2024
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[wasm] Fix ambiguous errno error when importing WASILibc module #75747

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6 changes: 6 additions & 0 deletions stdlib/public/Platform/Platform.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,11 @@ func _convertDarwinBooleanToBool(_ x: DarwinBoolean) -> Bool {

#endif

// wasi-libc defines `errno` in a way ClangImporter can understand, so we don't
// need to define shims for it. On the contrary, if we define the shim, we will
// get an ambiguity error when importing WASILibc module and SwiftWASILibc Clang
// module (or a Clang module that re-exports SwiftWASILibc).
#if !os(WASI)
//===----------------------------------------------------------------------===//
// sys/errno.h
//===----------------------------------------------------------------------===//
Expand All @@ -96,6 +101,7 @@ public var errno : Int32 {
return _swift_stdlib_setErrno(val)
}
}
#endif


//===----------------------------------------------------------------------===//
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