configure: allow reverse auto-selection of options

This adds the possibility to set foo_if and foo_if_any variables,
causing foo to be enabled if all/any of the listed options are
enabled.

Originally committed as revision 21215 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/configure b/configure
index d660a88..0c580e1 100755 (executable)
--- a/configure
+++ b/configure
@@ -450,11 +450,15 @@ check_deps(){
         eval dep_any="\$${cfg}_deps_any"
         eval dep_sel="\$${cfg}_select"
         eval dep_sgs="\$${cfg}_suggest"
+        eval dep_ifa="\$${cfg}_if"
+        eval dep_ifn="\$${cfg}_if_any"
 
-        pushvar cfg dep_all dep_any dep_sel dep_sgs
-        check_deps $dep_all $dep_any $dep_sel $dep_sgs
-        popvar cfg dep_all dep_any dep_sel dep_sgs
+        pushvar cfg dep_all dep_any dep_sel dep_sgs dep_ifa dep_ifn
+        check_deps $dep_all $dep_any $dep_sel $dep_sgs $dep_ifa $dep_ifn
+        popvar cfg dep_all dep_any dep_sel dep_sgs dep_ifa dep_ifn
 
+        [ -n "$dep_ifa" ] && { enabled_all $dep_ifa && enable_weak $cfg; }
+        [ -n "$dep_ifn" ] && { enabled_any $dep_ifn && enable_weak $cfg; }
         enabled_all  $dep_all || disable $cfg
         enabled_any  $dep_any || disable $cfg
         disabled_any $dep_sel && disable $cfg