Support building natively on Android (bionic) hosts

Package.swift

@@ -100,7 +100,7 @@ let package = Package(
                 .product(
                     name: "Subprocess",
                     package: "swift-subprocess",
-                    condition: .when(platforms: [.linux, .macOS])
+                    condition: .when(platforms: [.linux, .macOS, .android])
                 ),
             ]
         ),
@@ -110,7 +110,7 @@ let package = Package(
                 "DeveloperAPI",
                 "CXKit",
                 "XUtils",
-                .byName(name: "XADI", condition: .when(platforms: [.linux])),
+                .byName(name: "XADI", condition: .when(platforms: [.linux, .android])),
                 .product(name: "ConcurrencyExtras", package: "swift-concurrency-extras"),
                 .product(name: "Dependencies", package: "swift-dependencies"),
                 .product(name: "SwiftyMobileDevice", package: "SwiftyMobileDevice"),
@@ -128,17 +128,17 @@ let package = Package(
                 .product(
                     name: "OpenAPIAsyncHTTPClient",
                     package: "swift-openapi-async-http-client",
-                    condition: .when(platforms: [.linux])
+                    condition: .when(platforms: [.linux, .android])
                 ),
                 .product(
                     name: "AsyncHTTPClient",
                     package: "async-http-client",
-                    condition: .when(platforms: [.linux])
+                    condition: .when(platforms: [.linux, .android])
                 ),
                 .product(
                     name: "WebSocketKit",
                     package: "websocket-kit",
-                    condition: .when(platforms: [.linux])
+                    condition: .when(platforms: [.linux, .android])
                 ),
             ],
             cSettings: cSettings

Sources/XKit/HTTPClientProtocol/AsyncHTTPClient+HTTP.swift

@@ -5,7 +5,7 @@
 //  Created by Kabir Oberai on 05/05/21.
 //
 
-#if os(Linux)
+#if os(Linux) || os(Android)
 import Foundation
 import AsyncHTTPClient
 import NIO

Sources/XKit/HTTPClientProtocol/URLSession+HTTP.swift

@@ -5,7 +5,7 @@
 //  Created by Kabir Oberai on 05/05/21.
 //
 
-#if !os(Linux)
+#if !os(Linux) && !os(Android)
 import Foundation
 import ConcurrencyExtras
 import OpenAPIRuntime

Sources/XKit/Utilities/CHelpers.swift

@@ -8,10 +8,20 @@
 
 import Foundation
 import CXKit
+#if os(Android)
+import Android
+#endif
 
+#if os(Android)
+// bionic's FILE is an incomplete type, imported as OpaquePointer
+package var stdoutSafe: OpaquePointer {
+    get_stdout()
+}
+#else
 package var stdoutSafe: UnsafeMutablePointer<FILE> {
     get_stdout()
 }
+#endif
 
 extension Data {
     init?(deallocator: Deallocator = .free, acceptor: (inout Int) -> UnsafeMutableRawPointer?) {

Sources/XToolSupport/XTool.swift

@@ -1,4 +1,7 @@
 import Foundation
+#if os(Android)
+import Android
+#endif
 import XKit
 import ArgumentParser
 import XUtils
@@ -74,7 +77,7 @@ extension ParsableCommand where Self: SendableMetatype {
             }
         }
 
-        signal(SIGINT, SIG_IGN)
+        _ = signal(SIGINT, SIG_IGN)
         let source = DispatchSource.makeSignalSource(signal: SIGINT)
         source.setEventHandler { task.cancel() }
         source.resume()

Sources/XUtils/System+Utils.swift

@@ -1,4 +1,7 @@
 import Foundation
+#if os(Android)
+import Android
+#endif
 
 #if canImport(System)
 import System