Swiftc arguments in Swift Package - swift

Question

I hava a Swift Package with an executable target, the project structure looks like this:
MySwiftPackage
├── Package.swift
├── Sources
│   └── MySwiftPackage
│   ├── SwiftBridgeCore.swift
│   ├── main.swift
│   └── my_rust_lib.swift
├── bridging-header.h
├── file.json
├── generated
│   ├── SwiftBridgeCore.h
│   └── my_rust_lib
│   └── my_rust_lib.h
└── lib_mac
   └── libmy_rust_lib.a
This package needs to link to the static library lib_mac/libmy_rust_lib.a and links with the bridging-header.h.
The bridging-header.h just has some #include to the headers in generated.
To build this project, I run
swiftc -L lib_mac -lmy_rust_lib \
-import-objc-header bridging-header.h \
Sources/LinuxSwiftPackage/*.swift
This will build an executable I can run. I now want to accomplish the same this using swift build, so that I can add dependencies.
I have tried the following:
1. In my Package.swift, I added the following:
let package = Package(
name: "MySwiftPackage",
dependencies: [],
targets: [
.executableTarget(
name: "MySwiftPackage",
dependencies: [],
cSettings: [
.headerSearchPath(".")
],
linkerSettings: [
.linkedLibrary(":lib_mac/libmy_rust_lib.a")
]
)
]
)
This did not link the library however, as I got a lot of cannot find type <SomeType defined in the header> in scope
2. I have added the following to Package.swift:
let package = Package(
name: "MySwiftPackage",
dependencies: [],
targets: [
.executableTarget(
name: "MySwiftPackage",
dependencies: [],
linkerSettings: [
.unsafeFlags(["-L lib_mac", "-lmy_rust_lib", "-import-objc-header bridging-header.h"])
]
)
]
)
This would yield the same errors.
I also tried swiftSettings instead of linkerSettings, this would give me the following error: ld: symbol(s) not found for architecture x86_64
3. I have tried the following:
file.json
{
"version": 1,
"sdk": "/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin/swift",
"toolchain-bin-dir": "/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin",
"target": "x86_64-apple-macosx",
"dynamic-library-extension": "lib",
"extra-cc-flags": [
],
"extra-swiftc-flags": [
"-L",
"lib_mac",
"-lmy_rust_lib",
"-import-objc-header",
"bridging-header.h"
],
"extra-cpp-flags": []
}
with a Package.swift that looks like this:
let package = Package(
name: "MySwiftPackage",
dependencies: [],
targets: [
.executableTarget(
name: "MySwiftPackage",
dependencies: []
)
]
)
I then ran swift build --destination file.json, with would give me the following error:
error: no such module 'Foundation'
import Foundation
Will any of these approaches work with some changes? Or is there another approach that should work?
Thanks in advance,Jonas
P.S. I'm using macOS (12)