package/gstreamer/zbar-plugin: propagate dependencies from zbar

BR2_PACKAGE_GST_PLUGINS_BAD_ZBAR select BR2_PACKAGE_ZBAR which
has several dependencies from libv4l.

Propagate these dependencies to avoid unmet dependencies while
selecting BR2_PACKAGE_GST_PLUGINS_BAD_ZBAR.

[Peter: show comment if toolchain dependencies aren't available]
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gstreamer/gst-plugins-bad/Config.in

@@ -322,6 +322,16 @@ config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_VP8
 
 config BR2_PACKAGE_GST_PLUGINS_BAD_ZBAR
 	bool "zbar"
+	depends on BR2_TOOLCHAIN_HAS_THREADS # zbar-> libv4l
+	depends on BR2_USE_MMU # zbar-> libv4l
+	depends on !BR2_STATIC_LIBS # zbar-> libv4l
+	depends on BR2_INSTALL_LIBSTDCPP # zbar-> libv4l
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0 # zbar-> libv4l
 	select BR2_PACKAGE_ZBAR
 
+comment "zbar plugin needs a toolchain w/ threads, dynamic library, C++ and headers >= 3.0"
+	depends on BR2_USE_MMU
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS \
+		|| !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
+
 endif