Show all available distro configs

Change-Id: Ibecd89bb12b3e488a4cf25766bd6ffe5a097f135

autogen.sh

@@ -102,20 +102,32 @@ sub read_args($)
     return @lst;
 }
 
-sub invalid_distro($$)
+sub show_distro_configs($$)
 {
-    my ($config, $distro) = @_;
-    print STDERR "Can't find distro option set: $config\nThis is not necessarily a problem.\n";
-    print STDERR "Distros with distro option sets are:\n";
+    my ($prefix, $path) = @_;
     my $dirh;
-    opendir ($dirh, "$src_path/distro-configs");
+    opendir ($dirh, "$path");
     while (($_ = readdir ($dirh))) {
+        if (-d "$path/$_") {
+            show_distro_configs(
+                    $prefix eq "" ? "$_/" : "$prefix/$_/", "$path/$_")
+                unless $_ eq '.' || $_ eq '..';
+            next;
+        }
         /(.*)\.conf$/ || next;
-        print STDERR "\t$1\n";
+        print STDERR "\t$prefix$1\n";
     }
     closedir ($dirh);
 }
 
+sub invalid_distro($$)
+{
+    my ($config, $distro) = @_;
+    print STDERR "Can't find distro option set: $config\nThis is not necessarily a problem.\n";
+    print STDERR "Distros with distro option sets are:\n";
+    show_distro_configs("", "$src_path/distro-configs");
+}
+
 # Avoid confusing "aclocal: error: non-option arguments are not accepted: '.../m4'." error message.
 die "\$src_path must not contain spaces, but it is '$src_path'." if ($src_path =~ / /);