| Andreas Huber | 538f617 | 2010-11-08 11:13:04 -0800 | [diff] [blame^] | 1 | dnl as-ac-expand.m4 0.2.0 |
| 2 | dnl autostars m4 macro for expanding directories using configure's prefix |
| 3 | dnl thomas@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 | ]) |