1 dnl as-ac-expand.m4 0.2.0 2 dnl autostars m4 macro for expanding directories using configure's prefix 3 dnl thomas (a] apestaart.org 4 5 dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR) 6 dnl example 7 dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir) 8 dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local 9 10 AC_DEFUN([AS_AC_EXPAND], 11 [ 12 EXP_VAR=[$1] 13 FROM_VAR=[$2] 14 15 dnl first expand prefix and exec_prefix if necessary 16 prefix_save=$prefix 17 exec_prefix_save=$exec_prefix 18 19 dnl if no prefix given, then use /usr/local, the default prefix 20 if test "x$prefix" = "xNONE"; then 21 prefix="$ac_default_prefix" 22 fi 23 dnl if no exec_prefix given, then use prefix 24 if test "x$exec_prefix" = "xNONE"; then 25 exec_prefix=$prefix 26 fi 27 28 full_var="$FROM_VAR" 29 dnl loop until it doesn't change anymore 30 while true; do 31 new_full_var="`eval echo $full_var`" 32 if test "x$new_full_var" = "x$full_var"; then break; fi 33 full_var=$new_full_var 34 done 35 36 dnl clean up 37 full_var=$new_full_var 38 AC_SUBST([$1], "$full_var") 39 40 dnl restore prefix and exec_prefix 41 prefix=$prefix_save 42 exec_prefix=$exec_prefix_save 43 ]) 44
