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Ensure Locked+Platform.swift is not stripped when statically linking. #1035

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Merged
merged 1 commit into from
Mar 22, 2025
Merged

Ensure Locked+Platform.swift is not stripped when statically linking. #1035

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11 changes: 11 additions & 0 deletions Sources/Testing/Support/Locked+Platform.swift
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Expand Up @@ -94,3 +94,14 @@ typealias DefaultLock = Never
#warning("Platform-specific implementation missing: locking unavailable")
typealias DefaultLock = Never
#endif

#if SWT_NO_DYNAMIC_LINKING
/// A function which, when called by another file, ensures that the file in
/// which ``DefaultLock`` is declared is linked.
///
/// When static linking is used, the linker may opt to strip some or all of the
/// symbols (including protocol conformance metadata) declared in this file.
/// ``LockedWith`` calls this function in ``LockedWith/init(rawValue:)`` to work
/// around that issue.
func linkLockImplementations() {}
#endif
4 changes: 4 additions & 0 deletions Sources/Testing/Support/Locked.swift
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Expand Up @@ -66,6 +66,10 @@ struct LockedWith<L, T>: RawRepresentable where L: Lockable {
private nonisolated(unsafe) var _storage: ManagedBuffer<T, L>

init(rawValue: T) {
#if SWT_NO_DYNAMIC_LINKING
linkLockImplementations()
#endif

_storage = _Storage.create(minimumCapacity: 1, makingHeaderWith: { _ in rawValue })
_storage.withUnsafeMutablePointerToElements { lock in
L.initializeLock(at: lock)
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