Add fix-toolchain.sh to workaround Linux toolchain issue

Author: Kyle-Ye

.github/scripts/fix-toolchain.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+# Find the path to swift binary
+SWIFT_PATH=$(which swift)
+echo "Swift binary found at: $SWIFT_PATH"
+
+# Extract the toolchain path from swift binary path
+# Remove /usr/bin/swift from the path to get the toolchain root
+TOOLCHAIN_ROOT=$(dirname $(dirname "$SWIFT_PATH"))
+echo "Toolchain root: $TOOLCHAIN_ROOT"
+
+# Construct the path to CFBase.h
+CFBASE_PATH="$TOOLCHAIN_ROOT/lib/swift/CoreFoundation/CFBase.h"
+echo "Looking for CFBase.h at: $CFBASE_PATH"
+
+# Check if the file exists
+if [ -f "$CFBASE_PATH" ]; then
+    echo "Found CFBase.h, applying patch..."
+    
+    # Create a backup of the original file
+    cp "$CFBASE_PATH" "$CFBASE_PATH.bak"
+    
+    # Replace the include line
+    sed -i 's/#include <ptrauth.h>/\/\/ #include <ptrauth.h>/g' "$CFBASE_PATH"
+    
+    echo "Patch applied successfully."
+    echo "Original file backed up at $CFBASE_PATH.bak"
+else
+    echo "ERROR: Could not find CFBase.h in expected location."
+    echo "Toolchain structure may be different than expected."
+    exit 1
+fi

.github/workflows/ubuntu.yml

@@ -23,6 +23,10 @@ jobs:
     container: swift:${{ matrix.swift_version }}-jammy
     steps:
       - uses: actions/checkout@v4
+      - name: Toolchain fix patch
+        run: |
+          # Fix swift-corelibs-foundation#5211
+          .github/scripts/fix-toolchain.sh
       - name: Building and running tests in debug mode with coverage
         run: |
           swift test \