AS_HELP_STRING in an m4 macro: different decription wrt arguments

[Vincent Torri]

Hey,

i would like to use AS_HELP_STRING in an m4 macro such that the 
description of the help is different according to the value of one 
parameter. The macro is the following:

dnl use: ECORE_CHECK_MODULE(Foo, default-enabled[, dependancy[, 
ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]])
AC_DEFUN([ECORE_CHECK_MODULE],
[
m4_pushdef([UP], m4_toupper([$1]))dnl
m4_pushdef([DOWN], m4_tolower([$1]))dnl

want_module=$2

if test "x${want_module}" = "xyes" ; then
   wanted_value="enabled"
else
   wanted_value="disabled"
fi

AC_ARG_ENABLE([ecore-]m4_defn([DOWN]),
   [AS_HELP_STRING(
       [--enable-ecore-[]m4_defn([DOWN])],
       [enable the ecore_]m4_defn([DOWN])[ module. 
@<:@default=$wanted_value@:>@])],
   [want_module="$enableval"],
   [want_module="no"])

AC_MSG_CHECKING([whether ecore_]m4_defn([DOWN])[ module is to be built])

AS_IF([test "x$have_ecore_[]m4_defn([DOWN])" = "xyes"], [$4], [$5])

m4_popdef([UP])
m4_popdef([DOWN])
])


What is displayed by --help is:

  --enable-ecore-job      enable the ecore_job module. [default=$wanted_value]

I've searched a lot, tried a lot of things, nothing worked and i have no 
more idea.

can someone help me ?

Vincent Torri