$K.                      Stack Checking                          Default: $K+

 {$K.}

    Enables generation of stack checking code, which will check to see if
    enough space is available on the stack for local variables before a
    subprogram is called.

             $K+    Check stack space for local variables before calling
                    subprograms.

             $K-    Disable stack checking.

          Range:    From current location to next $K. directive.