ObjC BOOL Property Getter Mismatch

[jay18001]

Description

When using an Objective-C BOOL property that has a custom getter method, the compiler uses the getter method's name directly instead of the property name. This behavior seems to be specific to BOOL properties and doesn't seem to occur with other property types, such as C99 bool.

Reproduction

If we have this ObjC class.

@interface SomeClass : NSObject

@property (nonatomic, getter=getIsChecked, readonly) BOOL isChecked;

@end

The compiler will generate this swift interface

open class SomeClass : NSObject {

    open var getIsChecked: Bool { get }
}

Expected behavior

Using the ObjC class the output should be

open class SomeClass : NSObject {

    open var isChecked: Bool { get }
}

Environment

swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx15.0

Additional information

Using custom getters like are relatively rare in ObjC.

There are a few different workarounds:

1. Use NS_SWIFT_NAME()
2. Use a typedef of BOOL
3. Use C99 bool