[Buildroot] [PATCH] package/libxkbcommon: build libxkbregistry when libxml2 is available

libxkbregistry is the keyboard layout catalogue half of the library. It
parses the XML layout registry and so needs libxml2, which is presumably
why it was disabled unconditionally rather than wired to a dependency.

wine needs it. Its configure.ac requires XKBREGISTRY_LIBS alongside
wayland-client, wayland-scanner, xkbcommon and linux/input.h before it
will build the Wayland driver, and wine.mk passes --with-wayland for any
build with BR2_PACKAGE_WAYLAND - which turns that notice into a hard
error:

  checking for wayland-client.h... yes
  checking for wl_display_connect in -lwayland-client... yes
  checking for wayland-scanner... .../host/bin/wayland-scanner
  checking for xkb_context_new in -lxkbcommon... yes
  checking for wayland-egl.h... yes
  checking for wl_egl_window_create in -lwayland-egl... yes
  configure: error: Wayland development files not found, the Wayland
    driver won't be supported.
  This is an error since --with-wayland was requested.

Every other term of that test passes; only XKBREGISTRY_LIBS is empty, so
wine and wayland together could not be built on any architecture.

Gated on BR2_PACKAGE_LIBXML2 rather than turned on outright, because
meson.build takes dependency('libxml-2.0') unconditionally once
enable-xkbregistry is set, so a target without libxml2 would fail to
configure.

Signed-off-by: Alsey Coleman Miller <[email protected]>
---
 package/libxkbcommon/libxkbcommon.mk | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/package/libxkbcommon/libxkbcommon.mk b/package/libxkbcommon/libxkbcommon.mk
index 21a2b937ef..406affe401 100644
--- a/package/libxkbcommon/libxkbcommon.mk
+++ b/package/libxkbcommon/libxkbcommon.mk
@@ -12,8 +12,14 @@ LIBXKBCOMMON_CPE_ID_VENDOR = xkbcommon
 LIBXKBCOMMON_INSTALL_STAGING = YES
 LIBXKBCOMMON_DEPENDENCIES = host-bison host-flex
 LIBXKBCOMMON_CONF_OPTS = \
-	-Denable-docs=false \
-	-Denable-xkbregistry=false
+	-Denable-docs=false
+
+ifeq ($(BR2_PACKAGE_LIBXML2),y)
+LIBXKBCOMMON_CONF_OPTS += -Denable-xkbregistry=true
+LIBXKBCOMMON_DEPENDENCIES += libxml2
+else
+LIBXKBCOMMON_CONF_OPTS += -Denable-xkbregistry=false
+endif
 
 ifeq ($(BR2_PACKAGE_XORG7),y)
 LIBXKBCOMMON_CONF_OPTS += -Denable-x11=true
-- 
2.47.3

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