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Viewing changes to m4/as-ac-expand.m4

  • Committer: Koichi Akabe
  • Date: 2012-04-26 13:41:41 UTC
  • Revision ID: vbkaisetsu@gmail.com-20120426134141-mto9lyd7mfzkp4u3
initial commit (ported from wxlogic)

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m4/as-ac-expand.m4
 
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dnl as-ac-expand.m4 0.2.0
 
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dnl autostars m4 macro for expanding directories using configure's prefix
 
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dnl thomas@apestaart.org
 
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dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
 
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dnl example
 
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dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
 
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dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local
 
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AC_DEFUN([AS_AC_EXPAND],
 
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[
 
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  EXP_VAR=[$1]
 
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  FROM_VAR=[$2]
 
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  dnl first expand prefix and exec_prefix if necessary
 
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  prefix_save=$prefix
 
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  exec_prefix_save=$exec_prefix
 
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  dnl if no prefix given, then use /usr/local, the default prefix
 
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  if test "x$prefix" = "xNONE"; then
 
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    prefix="$ac_default_prefix"
 
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  fi
 
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  dnl if no exec_prefix given, then use prefix
 
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  if test "x$exec_prefix" = "xNONE"; then
 
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    exec_prefix=$prefix
 
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  fi
 
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  full_var="$FROM_VAR"
 
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  dnl loop until it doesn't change anymore
 
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  while true; do
 
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    new_full_var="`eval echo $full_var`"
 
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    if test "x$new_full_var" = "x$full_var"; then break; fi
 
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    full_var=$new_full_var
 
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  done
 
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  dnl clean up
 
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  full_var=$new_full_var
 
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  AC_SUBST([$1], "$full_var")
 
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  dnl restore prefix and exec_prefix
 
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  prefix=$prefix_save
 
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  exec_prefix=$exec_prefix_save
 
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])