build system: introduce a new feature called build variants.

it allows building a package multiple times in one pass with different build dirs,
based on the same build settings.
replaces templating hacks like the one used in the hostapd package

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18357 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 3 insertions, 0 deletions

diff --git a/scripts/metadata.pl b/scripts/metadata.pl
index ca00fcae6..26d878cc9 100755
--- a/scripts/metadata.pl
+++ b/scripts/metadata.pl
@@ -620,6 +620,9 @@ sub gen_package_mk() {
 		if ($config) {
 			$pkg->{buildonly} and $config = "";
 			print "package-$config += $pkg->{subdir}$pkg->{src}\n";
+			if ($pkg->{variant}) {
+				print "\$(curdir)/$pkg->{subdir}$pkg->{src}/variants += \$(if $config,$pkg->{variant})\n"
+			}
 			$pkg->{prereq} and print "prereq-$config += $pkg->{subdir}$pkg->{src}\n";
 		}