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dnl
dnl @synopsis RT_EXPAND_VAR(baz, $fraz)
dnl
dnl Iteratively expands the second parameter, until successive iterations
dnl yield no change. The result is then assigned to the first parameter.
dnl
dnl This code is heavily borrowed from the Apache 2 codebase.
dnl
AC_DEFUN([RT_EXPAND_VAR],[
ap_last=''
ap_cur='$2'
while test "x${ap_cur}" != "x${ap_last}"; do
ap_last="${ap_cur}"
ap_cur=`eval "echo ${ap_cur}"`
done
$1="${ap_cur}"
])
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