Re: [Buildroot] [PATCH v2 1/2] package/libxkbcommon: build libxkbregistry when libxml2 is available

["Raphaël Gallais-Pou" <rgallaispou@gmail.com>]

Hi,

For information, I've provided a similar fix here:
https://lore.kernel.org/buildroot/20260527-master-v1-1-0d975f3b3f0d@gmail.com/ 
earlier this summer.

Romain stated that xkbregistry had been disabled on purpose[1] and to 
which my question has remained unanswered in this time of holidays.

Best regards,
Raphaël

[1] 
https://lore.kernel.org/buildroot/cbfb9495-35d2-447e-a9e1-22c834d07dc5@smile.fr/ 


Le 09/08/2026 à 22:14, Alsey Coleman Miller a écrit :
> 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.
> 
> Regarding since when this is broken, three pieces had to come together:
> 
>   - libxkbcommon has passed -Denable-xkbregistry=false since commit
>     1791bc30a5 ("package/libxkbcommon: bump version to 1.0.1", Sep 2020),
>     i.e. Buildroot 2020.11. libxkbregistry has therefore never been built
>     in Buildroot.
> 
>   - wine's configure gained the XKBREGISTRY_LIBS term in its Wayland
>     test in wine 9.0, with upstream commit d64ea8e4a6c9
>     ("winewayland.drv: Enumerate Xkb layouts and create matching HKL.",
>     Nov 2023).
> 
>   - wine.mk started passing --with-wayland in commit 7cb49e7712
>     ("package/wine: bump to version 9.19", Oct 2024), which is what turns
>     the missing XKBREGISTRY_LIBS from a notice into a hard error.
> 
> The breakage therefore dates from Buildroot 2024.11, and every branch
> since is affected, including the LTS one: 2025.02.x carries wine 10.0,
> whose configure has the XKBREGISTRY_LIBS check, together with
> libxkbcommon 1.9.2 built with -Denable-xkbregistry=false, and its wine.mk
> passes --with-wayland. 2025.05.x and 2025.08.x are in the same state.
> A backport to 2025.02.x is thus needed.
> 
> Signed-off-by: Alsey Coleman Miller <alseycmiller@gmail.com>
> ---
> 
> Notes:
>      Changes since v1:
>       - Extend the commit log to document since when the problem exists, and
>         whether the 2025.02.x LTS branch is affected (suggested by Thomas
>         Petazzoni). No change to the code.
> 
>   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

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