package/libldns: add an option to build and install drill

The libldns library also comes with a CLI tool named drill, allowing to
perform DNS requests. Drill build is currently disabled by default.

Add a KConfig option to allow building and installing drill tool. Set
the default value to n to preserve the current behavior. Similarly to
linktest (see the comment in the .mk), drill fails to build correctly as
a static binary, so make the new option depend on non-static build.

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libldns/Config.in

@@ -8,3 +8,16 @@ config BR2_PACKAGE_LIBLDNS
 	  experimental software for current Internet Drafts.
 
 	  http://www.nlnetlabs.nl/projects/ldns
+
+if BR2_PACKAGE_LIBLDNS
+
+config BR2_PACKAGE_LIBLDNS_DRILL
+	bool "drill binary"
+	depends on !BR2_STATIC_LIBS
+	help
+	  Install the drill binary
+
+comment "drill needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
+
+endif # BR2_PACKAGE_LIBLDNS

package/libldns/libldns.mk

@@ -45,4 +45,11 @@ endif
 # interested in the lib target anyway
 LIBLDNS_MAKE_OPTS = lib
 
+ifeq ($(BR2_PACKAGE_LIBLDNS_DRILL),y)
+LIBLDNS_CONF_OPTS += --with-drill
+LIBLDNS_MAKE_OPTS += drill
+else
+LIBLDNS_CONF_OPTS += --without-drill
+endif
+
 $(eval $(autotools-package))