Enable building with the Swift Linux SDK (#151)

Author: t089

.github/workflows/ci.yml

@@ -42,3 +42,24 @@ jobs:
 
       - name: Run tests
         run: swift test -v
+
+  static-linux-sdk-build:
+    name: Linux Static SDK Build (${{ matrix.swift-version }} - ${{ matrix.os }})
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        swift-version:
+          - 6.1.2
+    runs-on: ${{ matrix.os }}
+    container: swift:${{ matrix.swift-version }}-noble
+    timeout-minutes: 30
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Install static SDK and build
+        env:
+          BUILD_FLAGS: ""
+        run: |
+          which curl || (apt -q update && apt -yq install curl)
+          curl -s --retry 3 https://raw.githubusercontent.com/swiftlang/github-workflows/refs/heads/main/.github/workflows/scripts/install-and-build-with-sdk.sh | \
+          bash -s -- --static --flags="$BUILD_FLAGS" ${{ matrix.swift-version }}

Sources/MCP/Base/Transports/StdioTransport.swift

@@ -13,9 +13,11 @@ import struct Foundation.Data
     import Darwin.POSIX
 #elseif canImport(Glibc)
     import Glibc
+#elseif canImport(Musl)
+    import Musl
 #endif
 
-#if canImport(Darwin) || canImport(Glibc)
+#if canImport(Darwin) || canImport(Glibc) || canImport(Musl)
     /// An implementation of the MCP stdio transport protocol.
     ///
     /// This transport implements the [stdio transport](https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#stdio)
@@ -107,7 +109,7 @@ import struct Foundation.Data
         /// - Parameter fileDescriptor: The file descriptor to configure
         /// - Throws: Error if the operation fails
         private func setNonBlocking(fileDescriptor: FileDescriptor) throws {
-            #if canImport(Darwin) || canImport(Glibc)
+            #if canImport(Darwin) || canImport(Glibc) || canImport(Musl)
                 // Get current flags
                 let flags = fcntl(fileDescriptor.rawValue, F_GETFL)
                 guard flags >= 0 else {