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Posted to commits@apr.apache.org by aa...@apache.org on 2002/02/28 03:54:01 UTC

cvs commit: apr/build apr_common.m4

aaron       02/02/27 18:54:01

  Modified:    build    apr_common.m4
  Log:
  Add a new m4 function APR_EXPAND_VAR that will iteratively
  interpolate the contents of a variable, such as $sysconfdir,
  for use in a borne script.
  
  Revision  Changes    Path
  1.23      +22 -0     apr/build/apr_common.m4
  
  Index: apr_common.m4
  ===================================================================
  RCS file: /home/cvs/apr/build/apr_common.m4,v
  retrieving revision 1.22
  retrieving revision 1.23
  diff -u -r1.22 -r1.23
  --- apr_common.m4	12 Nov 2001 01:16:00 -0000	1.22
  +++ apr_common.m4	28 Feb 2002 02:54:01 -0000	1.23
  @@ -554,4 +554,26 @@
   done
   ])
   
  +dnl Iteratively interpolate the contents of the second argument
  +dnl until interpolation offers no new result. Then assign the
  +dnl final result to $1.
  +dnl
  +dnl Example:
  +dnl
  +dnl foo=1
  +dnl bar='${foo}/2'
  +dnl baz='${bar}/3'
  +dnl APR_EXPAND_VAR(fraz, $baz)
  +dnl   $fraz is now "1/2/3"
  +dnl 
  +AC_DEFUN(APR_EXPAND_VAR,[
  +last=
  +cur=$2
  +while test "x$cur" != "x$last";
  +do
  +  last=$cur
  +  cur=`eval "echo $cur"`
  +done
  +$1=$cur
  +])