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

2 files changed, 4 insertions, 0 deletions

diff --git a/scripts/metadata.pl b/scripts/metadata.pl
index ca00fcae6d..26d878cc9e 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";
 		}
 
diff --git a/scripts/metadata.pm b/scripts/metadata.pm
index 8302728be6..b7a448b617 100644
--- a/scripts/metadata.pm
+++ b/scripts/metadata.pm
@@ -112,6 +112,7 @@ sub parse_package_metadata($) {
 			}
 		};
 		/^Depends: \s*(.+)\s*$/ and $pkg->{depends} = [ split /\s+/, $1 ];
+		/^Build-Variant: \s*(\w+)\s*/ and $pkg->{variant} = $1;
 		/^Build-Only: \s*(.+)\s*$/ and $pkg->{buildonly} = 1;
 		/^Build-Depends: \s*(.+)\s*$/ and $pkg->{builddepends} = [ split /\s+/, $1 ];
 		/^Build-Depends\/(\w+): \s*(.+)\s*$/ and $pkg->{"builddepends/$1"} = [ split /\s+/, $2 ];