interopMissingMOduleRefMiscompile

test.swift

// RUN: %empty-directory(%t)
// RUN: split-file %s %t
// RUN: cp %t/Inputs/header.h %t/Inputs2/header.h
// RUN: %target-swift-frontend %t/test.swift -I %t/Inputs -enable-experimental-cxx-interop -disable-availability-checking -emit-module -module-name SwiftMod -o %t

// RUN: %target-swift-frontend %t/test2.swift -I %t/Inputs2 -enable-experimental-cxx-interop -disable-availability-checking -emit-ir -I %t -Xcc -fmodule-map-file=%t/Inputs2/module.modulemap
 
//--- Inputs/module.modulemap
module CxxModule {
    header "header.h"
    header "header2.h"
    requires cplusplus
}

//--- Inputs2/module.modulemap
module CxxModule {
    header "header.h"
    requires cplusplus
}

//--- test2.swift

import SwiftMod

public func p () {
    let m =  UsePrivateStruct()
    m.test()
    // This gets miscompiled as it thinks `UsePrivateStruct` is an empty struct
// Emitted LLVM IR is completely WRONG:
//define swiftcc void @"$s5test21pyyF"() #0 {
//entry:
//  call swiftcc void @"$s8SwiftMod16UsePrivateStructVACycfC"()
//  call swiftcc void @"$s8SwiftMod16UsePrivateStructV4testyyF"()
//  ret void
//}
}

//--- Inputs/header2.h

struct CxxStructTwo {
public:
    int x;
    int y;
};

//--- Inputs/header.h

class CxxStruct {
public:
    int x; int y;

    void method() const;
};


//--- test.swift

import CxxModule

public struct UsePrivateStruct {
    var p = CxxStructTwo()

    public init() {
        p.x = 2
        p.y = 3
    }

    public func test() {
        print(p)
    }
}