attempt to detect a bad (as in HPUX 10.20 bad) gmtime_r function

  AC_CHECK_FUNCS( gmtime_r )

fi

if test x$cross_compiling != xyes; then

  dnl if gmtime_r was found, verify that it actuall works, as (at least) HPUX

  dnl 10.20 is known to have a buggy one. If it doesn't work, disable use of

  dnl it.

  AC_MSG_CHECKING([if gmtime_r works])

  AC_RUN_IFELSE([[

  #include <time.h>

  int main(void)

  {

    time_t local = 1170352587;

    struct tm *gmt;

    struct tm keeper;

    putenv("TZ=CST6CDT");

    tzset();

    gmt = gmtime_r(&local, &keeper);

    if(gmt) {

      return 0;

    }

    return 1; /* failure */

  }

   ]],

   dnl success, do nothing

   AC_MSG_RESULT(yes)

   ,

   dnl failure, now disable the function

   AC_MSG_RESULT(no)

   ac_cv_func_gmtime_r="no"

   ,

   dnl not invoked when crosscompiling)

])

fi

dnl **********************************************************************

dnl Back to "normal" configuring