ac_prog_mysqlshow

Check for the program 'mysqlshow' let script continue if exists & works pops up error message if not.

Testing of functionality is by invoking it with root password 'rootpass'. If it works, it should show all databases currently in system.

Besides checking mysql, this macro also set these environment variables upon completion:

     MYSQLSHOW = which mysqlshow

AC_DEFUN([AC_PROG_MYSQLSHOW],[
AC_REQUIRE([AC_EXEEXT])dnl
AC_PATH_PROG(MYSQLSHOW, mysqlshow$EXEEXT, nocommand)
if test "$MYSQLSHOW" = nocommand; then
        AC_MSG_ERROR([mysqlshow not found in $PATH])
fi
AC_MSG_CHECKING([if mysqlshow works])
if $MYSQLSHOW -u root -prootpass > /dev/null; then
        AC_MSG_RESULT([yes])
else
        AC_MSG_NOTICE([Before installation, set MySQL root password to rootpass; restore your root password afterwards.])
        AC_MSG_ERROR([mysqlshow cannot run with root password = rootpass])
fi;dnl
])