Basic OpenBSD support.

Pepper in the right conditionals throughout.

The unversioned triple issue is still necessary for the bootstrap script
(and only the bootstrap script) which we will deal with separately.

Author: 3405691582

Sources/Basics/DispatchTimeInterval+Extensions.swift

@@ -59,7 +59,7 @@ extension DispatchTimeInterval {
 }
 
 // remove when available to all platforms
-#if os(Linux) || os(Windows) || os(Android)
+#if os(Linux) || os(Windows) || os(Android) || os(OpenBSD)
 extension DispatchTime {
     public func distance(to: DispatchTime) -> DispatchTimeInterval {
         let duration = to.uptimeNanoseconds - self.uptimeNanoseconds

Sources/Commands/SwiftTool.swift

@@ -380,7 +380,7 @@ public class SwiftTool {
               #if os(Windows)
                 // Exit as if by signal()
                 TerminateProcess(GetCurrentProcess(), 3)
-              #elseif os(macOS)
+              #elseif os(macOS) || os(OpenBSD)
                 // Install the default signal handler.
                 var action = sigaction()
                 action.__sigaction_u.__sa_handler = SIG_DFL

Sources/PackageCollections/Providers/JSONPackageCollectionProvider.swift

@@ -459,6 +459,8 @@ extension PackageModel.Platform {
             self = PackageModel.Platform.windows
         case let name where name.contains("wasi"):
             self = PackageModel.Platform.wasi
+        case let name where name.contains("openbsd"):
+            self = PackageModel.Platform.openbsd
         default:
             return nil
         }

Sources/PackageDescription/SupportedPlatforms.swift

@@ -51,6 +51,10 @@ public struct Platform: Encodable, Equatable {
     /// The WebAssembly System Interface platform.
     @available(_PackageDescription, introduced: 5.3)
     public static let wasi: Platform = Platform(name: "wasi")
+
+    /// The OpenBSD platform.
+    @available(_PackageDescription, introduced: 999)
+    public static let openbsd: Platform = Platform(name: "openbsd")
 }
 
 /// A platform that the Swift package supports.

Sources/PackageLoading/PlatformRegistry.swift

@@ -31,6 +31,6 @@ public final class PlatformRegistry {
 
     /// The static list of known platforms.
     private static var _knownPlatforms: [Platform] {
-        return [.macOS, .macCatalyst, .iOS, .tvOS, .watchOS, .linux, .windows, .android, .wasi, .driverKit]
+        return [.macOS, .macCatalyst, .iOS, .tvOS, .watchOS, .linux, .windows, .android, .wasi, .driverKit, .openbsd]
     }
 }

Sources/PackageModel/Platform.swift

@@ -35,6 +35,7 @@ public struct Platform: Equatable, Hashable, Codable {
     public static let android: Platform = Platform(name: "android", oldestSupportedVersion: .unknown)
     public static let windows: Platform = Platform(name: "windows", oldestSupportedVersion: .unknown)
     public static let wasi: Platform = Platform(name: "wasi", oldestSupportedVersion: .unknown)
+    public static let openbsd: Platform = Platform(name: "openbsd", oldestSupportedVersion: .unknown)
 
 }
 

Sources/SPMBuildCore/BinaryTarget+Extensions.swift

@@ -76,7 +76,7 @@ fileprivate extension Triple.OS {
     /// Returns a representation of the receiver that can be compared with platform strings declared in an XCFramework.
     var asXCFrameworkPlatformString: String? {
         switch self {
-        case .darwin, .linux, .wasi, .windows:
+        case .darwin, .linux, .wasi, .windows, .openbsd:
             return nil // XCFrameworks do not support any of these platforms today.
         case .macOS:
             return "macos"

Sources/SPMBuildCore/BuildParameters.swift

@@ -148,6 +148,8 @@ public struct BuildParameters: Encodable {
             return .wasi
         } else if self.triple.isWindows() {
             return .windows
+        } else if self.triple.isOpenBSD() {
+            return .openbsd
         } else {
             return .linux
         }

Utilities/bootstrap

@@ -776,9 +776,12 @@ def get_swiftpm_flags(args):
     # TensorFlow).
     if platform.system() == "Darwin":
         swift_library_rpath_prefix = "@executable_path/../"
-    elif platform.system() == 'Linux':
+    elif platform.system() == 'Linux' or platform.system() == 'OpenBSD':
         # `$ORIGIN` is an ELF construct.
         swift_library_rpath_prefix = "$ORIGIN/../"
+    if platform.system() == 'OpenBSD':
+        build_flags.extend(["-Xlinker", "-z", "-Xlinker", "origin"])
+
     platform_path = None
     for path in args.target_info["paths"]["runtimeLibraryPaths"]:
         platform_path = re.search(r"(lib/swift/([^/]+))$", path)
@@ -812,6 +815,10 @@ def get_swiftpm_flags(args):
     if 'ANDROID_DATA' in os.environ:
         build_flags.extend(["-Xswiftc", "-Xcc", "-Xswiftc", "-U_GNU_SOURCE"])
 
+    if platform.system() == "OpenBSD":
+        build_flags.extend(["-Xcc", "-I/usr/local/include"])
+        build_flags.extend(["-Xlinker", "-L/usr/local/lib"])
+
     # On ELF platforms, remove the host toolchain's stdlib absolute rpath from
     # installed executables and shared libraries.
     if platform.system() != "Darwin" and args.command == 'install':