// swift-tools-version: 5.9
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "TestApp",
    platforms: [.macOS(.v14), .iOS(.v13), .watchOS(.v6)],
    products: [
        .executable(name: "MyApp", targets: ["MyApp"]),
        .library(name: "MySwiftLib", type: .static, targets: ["MySwiftLib"])
    ],
    targets: [
        .executableTarget(name: "MyApp",
            cSettings: [
                .headerSearchPath("../../.build/x86_64-apple-macosx/debug/MySwiftLib.build")
            ]/*,
            linkerSettings: [
                .unsafeFlags(["-Xlinker", "-rpath", "-Xlinker", "../../.build/x86_64-apple-macosx/debug/"]),
                .linkedLibrary("MySwiftLib")
            ]*/
        ),
        .target(name: "MySwiftLib",
            swiftSettings: [
                .interoperabilityMode(.C)
            ]
        )
    ]
)

@_cdecl("mySwiftFunc")
public func mySwiftFunc() {
    print("Hello from Swift")
}

#include <stdio.h>

#include "MySwiftLib-Swift.h"

void main() {
    puts("Hello World from C!");
    mySwiftFunc();
}

/Users/olivier/dev/test_swift_lib/.build/x86_64-apple-macosx/debug/MySwiftLib.build/module.modulemap:1:8: error: module 'MySwiftLib' requires feature 'objc'
module MySwiftLib {
       ^
/Users/olivier/dev/test_swift_lib/Sources/MyApp/main.c:3:10: note: submodule of top-level module 'MySwiftLib' implicitly imported here
#include "MySwiftLib-Swift.h"
         ^
/Users/olivier/dev/test_swift_lib/Sources/MyApp/main.c:7:5: error: call to undeclared function 'mySwiftFunc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    mySwiftFunc();
    ^
2 errors generated.
[0/2] Compiling MyApp main.c