test/com/sun/tools/attach/CommonSetup.sh

*** 47,56 ****
--- 47,62 ----
    Windows* )
      PS=";"
      OS="Windows"
      FS="\\"
      ;;
+   CYGWIN* )
+     PS=";"
+     OS="Windows"
+     FS="\\"
+     isCygwin=true
+     ;;
    * )
      echo "Unrecognized system!"
      exit 1;
      ;;
  esac