fix

scripts/coverage-llvm.sh

@@ -17,8 +17,20 @@ echo "[*] Output dir: ${OUTPUT_DIR}"
 find_llvm_tool() {
     local tool_name="$1"
 
-    # macOS: use xcrun
+    # macOS: derive from the same directory as the active clang to guarantee
+    # the profraw format version matches the compiler that instrumented the binary.
     if [[ "$(uname)" == "Darwin" ]]; then
+        local clang_path
+        clang_path=$(xcrun --find clang 2>/dev/null)
+        if [[ -n "$clang_path" ]]; then
+            local tool_path
+            tool_path="$(dirname "$clang_path")/${tool_name}"
+            if [[ -x "$tool_path" ]]; then
+                echo "$tool_path"
+                return 0
+            fi
+        fi
+        # Fallback: xcrun
         if xcrun --find "${tool_name}" &>/dev/null; then
             echo "xcrun ${tool_name}"
             return 0
@@ -51,6 +63,12 @@ fi
 echo "[*] Using: ${LLVM_PROFDATA}"
 echo "[*] Using: ${LLVM_COV}"
 
+# Print version info for debugging version mismatches
+if [[ "$(uname)" == "Darwin" ]]; then
+    echo "[*] Compiler: $(xcrun clang --version | head -1)"
+    echo "[*] profdata: $(${LLVM_PROFDATA} show --version 2>&1 | head -1 || true)"
+fi
+
 # Find test binary
 if [[ -z "${TEST_BINARY}" ]]; then
     for path in \