When run, they
         generate files in the build directory with code coverage
         metrics.
         See <A
HREF="regress-coverage.html"
>Section 30.4</A
>
         for more information. This option is for use only with GCC
         and when doing development work.
        </P
></DD
><DT
><TT
CLASS="OPTION"
>--enable-profiling</TT
></DT
><DD
><P
>         If using GCC, all programs and libraries are compiled so they
         can be profiled.  On backend exit, a subdirectory will be created
         t