Cannot create a Package using binary resources with modulemap

We currently are developing a LibSSH wrapper using Swift + Combine and for the development phase it was all on a project with all of the dependencies in the Frameworks folder, dependencies are:

  • libsshd.a
  • libssh.h
  • libz.tbd
  • openssl.framework
  • include

For the dependencies to be accesible in the project we've got a shim and module map in the project as follows:

File shim.h

#ifndef shim_h
#define shim_h

// A shim header to bridge C to a Swift modulemap

#include <libssh/libssh.h>
#include <libssh/callbacks.h>
#include <libssh/sftp.h>

#endif /* shim_h */

File module.modulemap

/// Expose LIbSSH for extraneous Swift usage
module LibSSH {
    header "shim.h"
}

Our plan is to migrate this wrapper to a Swift Package which can be later used on our app as a SPM dependency. This year's WWDC Session 10147 explains the possibility of adding binary frameworks to Swift packages.

Creating a Swift PM yields to some errors which we're not able to solve. To be able to do this we've created a XCFramework from the previous openssl.framework stripping all architectures and only leaving x86_64. The current package structure is as follows:

.
├── OpenSSL.xcframework
├── Package.swift
├── README.md
├── Sources
│   └── BKSSH
│       └── Our Swift code for the wrapper
└── include
    ├── module.modulemap
    └── shim.h

File Package.swift

// swift-tools-version:5.3

import PackageDescription

let package = Package(
    name: "BKSSH",
    products: [
        .library(name: "BKSSH",targets: ["BKSSH"]),
    ],
    targets: [
        .target(name: "BKSSH", dependencies: [.byName(name: "OpenSSL")]),
        .binaryTarget(name: "OpenSSL", path: "OpenSSL.xcframework"),
    ])

Building this from the console produces the following error:

error: artifact 'OpenSSL' does not support the target platform and architecture ('Triple(tripleString: "x86_64-apple-macosx", arch: SPMBuildCore.Triple.Arch.x86_64, vendor: SPMBuildCore.Triple.Vendor.apple, os: SPMBuildCore.Triple.OS.macOS, abi: SPMBuildCore.Triple.ABI.unknown)')
/.../BKSSH/Sources/BKSSH/BKSSH.swift:5:8: error: no such module 'OpenSSL'
import OpenSSL

All of this leaves us with the question if is possible to create a module map for a binaryPath. Maybe there's another way to approach this we've not yet considered and are missing

error: artifact 'OpenSSL' does not support the target platform and architecture ('Triple(tripleString: "x86_64-apple-macosx", arch: SPMBuildCore.Triple.Arch.x86_64, vendor: SPMBuildCore.Triple.Vendor.apple, os: SPMBuildCore.Triple.OS.macOS, abi: SPMBuildCore.Triple.ABI.unknown)')

This suggests that there is something wrong with the XCFramework itself or that there is an issue in SwiftPM recognising it. Does Xcode accept this XCFramework?

I’ll take a look at that. The real issue seems to be that modulemap at the package is completely ignored.

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