1 dnl as-ac-expand.m4 0.2.0 -*- autoconf -*- 2 dnl autostars m4 macro for expanding directories using configure's prefix 3 4 dnl (C) 2003, 2004, 2005 Thomas Vander Stichele <thomas at apestaart dot org> 5 6 dnl Copying and distribution of this file, with or without modification, 7 dnl are permitted in any medium without royalty provided the copyright 8 dnl notice and this notice are preserved. 9 10 dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR) 11 12 dnl example: 13 dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir) 14 dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local 15 16 AC_DEFUN([AS_AC_EXPAND], 17 [ 18 EXP_VAR=[$1] 19 FROM_VAR=[$2] 20 21 dnl first expand prefix and exec_prefix if necessary 22 prefix_save=$prefix 23 exec_prefix_save=$exec_prefix 24 25 dnl if no prefix given, then use /usr/local, the default prefix 26 if test "x$prefix" = "xNONE"; then 27 prefix="$ac_default_prefix" 28 fi 29 dnl if no exec_prefix given, then use prefix 30 if test "x$exec_prefix" = "xNONE"; then 31 exec_prefix=$prefix 32 fi 33 34 full_var="$FROM_VAR" 35 dnl loop until it doesn't change anymore 36 while true; do 37 new_full_var="`eval echo $full_var`" 38 if test "x$new_full_var" = "x$full_var"; then break; fi 39 full_var=$new_full_var 40 done 41 42 dnl clean up 43 full_var=$new_full_var 44 AC_SUBST([$1], "$full_var") 45 46 dnl restore prefix and exec_prefix 47 prefix=$prefix_save 48 exec_prefix=$exec_prefix_save 49 ]) 50
