Add Wasm Swift SDK checks for swift run

lit.cfg

@@ -123,7 +123,7 @@ else:
 # that's possible
 if lit_config.params.get("have-network"):
     config.available_features.add("have-network")
-    
+
 ###
 
 # Get the package path.
@@ -162,6 +162,10 @@ if swiftpm_srcdir is None:
 if os.path.exists(swiftpm_srcdir):
     config.available_features.add("have-swiftpm")
     config.substitutions.append( ('%{swiftpm_srcdir}', swiftpm_srcdir) )
+    config.substitutions.append(
+      ('%{swift-sdk-generator_srcdir}', os.path.join(swiftpm_srcdir, "..", "swift-sdk-generator"))
+    )
+    config.substitutions.append( ('%{swiftpm_homedir}', os.path.join(os.environ['HOME'], ".swiftpm", "swift-sdks")) )
 
 # Use the default Swift src layout if Swift the benchmark suite path is not
 # provided as a param.
@@ -263,11 +267,13 @@ if swiftpm_build is not None:
     config.substitutions.append( ('%{swift-build}',  os.path.join(swiftpm_build, "swift-build")) )
     config.substitutions.append( ('%{swift-test}',  os.path.join(swiftpm_build, "swift-test")) )
     config.substitutions.append( ('%{swift-run}',  os.path.join(swiftpm_build, "swift-run")) )
+    config.substitutions.append( ('%{swift-sdk}',  os.path.join(swiftpm_build, "swift-sdk")) )
 else:
     config.substitutions.append( ('%{swift-package}', swift_path + ' package') )
     config.substitutions.append( ('%{swift-build}', swift_path + ' build') )
     config.substitutions.append( ('%{swift-test}', swift_path + ' test') )
     config.substitutions.append( ('%{swift-run}', swift_path + ' run') )
+    config.substitutions.append( ('%{swift-sdk}', swift_path + ' sdk') )
 
 ###
 

wasm/Hello/.gitignore

@@ -0,0 +1,8 @@
+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

wasm/Hello/Package.swift

@@ -0,0 +1,11 @@
+// swift-tools-version: 6.2
+import PackageDescription
+
+let package = Package(
+    name: "Hello",
+    targets: [
+        .executableTarget(
+            name: "Hello"
+        ),
+    ]
+)

wasm/Hello/Sources/Hello/Hello.swift

@@ -0,0 +1,9 @@
+import WASILibc
+
+@main
+struct Hello {
+    static func main() {
+        print("Hello, world!")
+        puts("Hello from WASILibc!")
+    }
+}

wasm/Hello/Tests/HelloTests/HelloTests.swift

@@ -0,0 +1,13 @@
+import Testing
+import XCTest
+@testable import Hello
+
+@Test func example() async throws {
+    #expect(Int("42") == 42)
+}
+
+final class HelloTests: XCTestCase {
+    func testExample() throws {
+        XCTAssertEqual(Int("42") == 42)
+    }
+}

wasm/swiftpm.md

@@ -0,0 +1,53 @@
+# SwiftPM checks for Wasm Swift SDKs
+
+This test can only run on Linux CI as we only build Swift SDK for Wasm on Linux CI nodes.
+
+```
+REQUIRES: platform=Linux
+```
+
+1. Let's install Swift SDK for Wasm first:
+
+```
+RUN: %{swift-sdk} list | %{FileCheck} --check-prefix CHECK-SDK-LIST-BEFORE %s
+CHECK-SDK-LIST-BEFORE: No Swift SDKs are currently installed.
+RUN: find "%{swift-sdk-generator_srcdir}/Bundles" -mindepth 1 -maxdepth 1 | xargs %{swift-sdk} install | %{FileCheck} --check-prefix CHECK-SDK-INSTALL %s
+CHECK-SDK-INSTALL: Swift SDK bundle at
+CHECK-SDK-INSTALL: successfully installed as
+RUN: %{swift-sdk} list | grep wasm | wc -l | %{FileCheck} --check-prefix CHECK-SDK-LIST-AFTER %s
+CHECK-SDK-LIST-AFTER: 2
+```
+
+2. Using a prepared basic package that exercises Swift stdlib and `import WASILibc`:
+
+```
+RUN: rm -rf %t.dir
+RUN: mkdir -p %t.dir
+RUN: cp -r %S/Hello %t.dir
+```
+
+3. Building and running the prepared package:
+
+    a) Non-embedded Swift SDK
+
+    ```
+    RUN: %{swift-sdk} list | grep -v embedded | xargs %{swift-run} --package-path %t.dir/Hello --swift-sdk | %{FileCheck} --check-prefix CHECK-RUN-OUTPUT %s
+    CHECK-RUN-OUTPUT: Hello, world!
+    CHECK-RUN-OUTPUT-NEXT: Hello from WASILibc!
+    ```
+
+    b) Embedded Swift SDK
+
+    ```
+    RUN: %{swift-sdk} list | grep embedded | xargs %{swift-run} --package-path %t.dir/Hello --swift-sdk | %{FileCheck} --check-prefix CHECK-EMBEDDED-RUN-OUTPUT %s
+    CHECK-EMBEDDED-RUN-OUTPUT: Hello, world!
+    CHECK-EMBEDDED-RUN-OUTPUT-NEXT: Hello from WASILibc!
+    ```
+
+4. Clean up installed Swift SDKs:
+
+```
+RUN: find %{swiftpm_homedir}/ -mindepth 1 -maxdepth 1 | xargs rm -rf
+RUN: %{swift-sdk} list | %{FileCheck} --check-prefix CHECK-SDK-LIST-FINAL %s
+CHECK-SDK-LIST-FINAL: No Swift SDKs are currently installed.
+```