libgudev: New package

As libgudev recently was split from the main systemd/udev source, this
library is now required to build certain packages.

This library is only relevant to systemd, as the code it contains is
still contained in eudev.

[Thomas:
 - don't show the dependency comment when systemd is not available,
   since libgudev is anyway useless when you're not using systemd.
 - fix the license, it's LGPLv2.1+ and not GPLv2+
 - remove useless empty lines in the .mk file.]

Signed-off-by: Nathaniel Roach <nroach44@gmail.com>
Tested-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Config.in

@@ -853,6 +853,7 @@ menu "Hardware handling"
 	source "package/libfreefare/Config.in"
 	source "package/libftdi/Config.in"
 	source "package/libftdi1/Config.in"
+	source "package/libgudev/Config.in"
 	source "package/libhid/Config.in"
 	source "package/libiio/Config.in"
 	source "package/libinput/Config.in"

package/libgudev/Config.in

@@ -0,0 +1,22 @@
+config BR2_PACKAGE_LIBGUDEV
+	bool "libgudev"
+	depends on BR2_INIT_SYSTEMD
+	depends on BR2_USE_WCHAR # gettext
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU # fork()
+	select BR2_PACKAGE_LIBGLIB2
+	help
+	  This library provides GObject bindings for libudev.  It was
+	  originally part of udev-extras, then udev, then systemd.
+	  It's now a project on its own. Required for building some
+	  programs that use udev, when using systemd.
+
+	  When systemd is not used, libgudev is directly provided by
+	  eudev.
+
+	  https://wiki.gnome.org/Projects/libgudev
+
+comment "libgudev needs a toolchain w/ wchar, threads"
+	depends on BR2_USE_MMU
+	depends on BR2_INIT_SYSTEMD
+	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS

package/libgudev/libgudev.mk

@@ -0,0 +1,15 @@
+################################################################################
+#
+# libgudev
+#
+################################################################################
+
+LIBGUDEV_VERSION = 230
+LIBGUDEV_SOURCE = libgudev-$(LIBGUDEV_VERSION).tar.xz
+LIBGUDEV_SITE = http://ftp.gnome.org/pub/GNOME/sources/libgudev/$(LIBGUDEV_VERSION)
+LIBGUDEV_INSTALL_STAGING = YES
+LIBGUDEV_DEPENDENCIES = host-pkgconf udev libglib2
+LIBGUDEV_LICENSE = LGPLv2.1+
+LIBGUDEV_LICENSE_FILES = COPYING
+
+$(eval $(autotools-package))

package/systemd/Config.in

@@ -55,7 +55,6 @@ config BR2_PACKAGE_SYSTEMD
 
 	  The selection of other packages will enable some features:
 
-	  - libglib2 package will add support for gudev.
 	  - acl package will add support for multi-seat.
 
 	  http://freedesktop.org/wiki/Software/systemd