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dnl bspopts.m4,v 1.1 2001/11/14 18:57:26 joel Exp

dnl

dnl RTEMS_BSPOPTS_* - some autoconf voodoo to handle default values and

dnl help-strings for per-BSP-environment variables.

dnl To be used in bsp-configure scripts

dnl Example:

dnl

dnl RTEMS_BSPOPTS_SET([foo],[bar],[0])

dnl RTEMS_BSPOPTS_SET([foo],[baz*],[hello])

dnl RTEMS_BSPOPTS_SET([foo],[*],[])

dnl RTEMS_BSPOPTS_HELP([foo],[env. variable foo])

dnl -> Add "0" as default value of variable "foo" for BSP "bar"

dnl -> Add "hello" as default value of variable "foo" for all BSPs starting

dnl with "baz" in their name.

dnl -> Undefine foo as default clause for all BSP's.

dnl

dnl All this basically expands to a /bin/shell "case"-statement with

dnl accompanying autoconf magic to propagate VAR to bspopts.h.

dnl RTEMS_BSPOPTS_HELP(VAR,HELP-STRING)

dnl Set up printing the HELP-STRING for bspopts.h's variable VAR and add

dnl appropriate /bin/sh-magic to "configure" to have VAR set up.

AC_DEFUN([RTEMS_BSPOPTS_HELP],[

RTEMS_ARG_VAR([$1],[$2])

m4_ifdef([_$1],[

case ${RTEMS_BSP} in

_$1[]dnl

esac],[])

if test -n "[$]{$1}"; then[]dnl

AC_DEFINE_UNQUOTED([$1],

  [[$]$1],

  [$2])dnl

fi

])

dnl RTEMS_BSPOPTS_SET(VAR,BSP,DEFAULT)

dnl Set up a value DEFAULT to be used as default value for variable VAR for

dnl BSP in RTEMS_BSPOPTS_HELP.

dnl MUST be use in front of exactly _one_ corresponding RTEMS_BSPOPTS_HELP

AC_DEFUN([RTEMS_BSPOPTS_SET],[dnl

m4_append([_$1],

[$2 )

  $1=[$]{$1-$3} ;;

])

])

dnl RTEMS_ARG_VAR(VAR,HELP-STRING)

dnl An internal macros to have RTEMS_BSPOPTS_HELP's help string pretty

dnl printed with configure --help.

dnl Stripped down version of autoconf-2.52's AC_ARG_VAR.

AC_DEFUN([RTEMS_ARG_VAR],

[

m4_expand_once([m4_divert_once([HELP_VAR],

[AC_HELP_STRING([$1], [$2], [              ])])],

      [$0($1)])dnl

])