A few more Android fixes and re-enable Android

Author: jakepetroules

.github/workflows/pull_request.yml

@@ -27,6 +27,10 @@ jobs:
       enable_macos_checks: true
       macos_exclude_xcode_versions: "[{\"xcode_version\": \"16.3\"}, {\"xcode_version\": \"16.4\"}]"
       macos_build_command: 'swift build'
+      enable_android_sdk_build: true
+      android_sdk_build_command: "swift build --build-tests"
+      android_ndk_versions: '["r27d", "r29"]'
+      android_sdk_triples: '["aarch64-unknown-linux-android28"]'
 
   soundness:
     name: Soundness

Sources/Basics/Concurrency/AsyncProcess.swift

@@ -25,9 +25,13 @@ import func TSCclibc.SPM_posix_spawn_file_actions_addchdir_np_supported
 
 @_implementationOnly
 import func TSCclibc.SPM_posix_spawn_file_actions_addchdir_np
+
+@_implementationOnly
+import func TSCclibc.SPM_posix_spawnp
 #else
-private import func TSCclibc.SPM_posix_spawn_file_actions_addchdir_np_supported
-private import func TSCclibc.SPM_posix_spawn_file_actions_addchdir_np
+package import func TSCclibc.SPM_posix_spawn_file_actions_addchdir_np_supported
+package import func TSCclibc.SPM_posix_spawn_file_actions_addchdir_np
+package import func TSCclibc.SPM_posix_spawnp
 #endif // #if USE_IMPL_ONLY_IMPORTS
 #endif
 
@@ -687,7 +691,11 @@ package final class AsyncProcess {
         }
         let argv = CStringArray(resolvedArgs)
         let env = CStringArray(environment.map { "\($0.0)=\($0.1)" })
+        #if canImport(Darwin)
         let rv = posix_spawnp(&self.processID, argv.cArray[0]!, &fileActions, &attributes, argv.cArray, env.cArray)
+        #else
+        let rv = SPM_posix_spawnp(&self.processID, argv.cArray[0]!, &fileActions, &attributes, argv.cArray, env.cArray)
+        #endif
 
         guard rv == 0 else {
             throw SystemError.posix_spawn(rv, self.arguments)

Tests/FunctionalTests/LibraryEvolutionXCFLinuxTests.swift

@@ -35,6 +35,8 @@ private struct SwiftPMTests {
                 let arch = "aarch64"
                 #elseif arch(x86_64)
                 let arch = "x86_64"
+                #else
+                preconditionFailure("Unsupported platform or host arch for test")
                 #endif
 
                 let platform = "linux"

Tests/IntegrationTests/SwiftPMTests.swift

@@ -216,7 +216,7 @@ private struct SwiftPMTests {
             #elseif arch(arm64)
             hostArch = "arm64"
             #else
-            precondition("Unsupported platform or host arch for test")
+            preconditionFailure("Unsupported platform or host arch for test")
             #endif
             switch buildSystem {
             case .native: