[Buildroot] [PATCH] vlc: fix build when Qt4 development files are installed on the host

[Vicente Olivert Riera <Vincent.Riera@imgtec.com>]

Dear Thomas Petazzoni,

On 10/08/2014 10:11 PM, Thomas Petazzoni wrote:
> When Qt4 development files are installed on the host, VLC uses
> /usr/bin/moc, /usr/bin/uic and /usr/bin/rcc when Qt support is
> enabled. However, those host installed versions are not necessarily
> compatible with the Qt version used in Buildroot, causes some build
> failures.
>
> This commit therefore passes explicit ac_cv_path_MOC, ac_cv_path_RCC
> and ac_cv_path_UIC variables to make sure the Qt host tools built by
> Buildroot are used.
>
> Note that the VLC configure.ac script uses 'pkg-config
> --variable=exec_prefix QtCore' to find the location of such tools, but
> this invocation returns /usr. One solution would have been to extend
> the pkgconf-01-fix-variable.patch we have against pkgconf to also
> cover exec_prefix, but this has more uncertain consequences than just
> fixing VLC.
>
> Fixes:
>
>    http://autobuild.buildroot.org/results/061/06174eaeb7f2b8a591395e607912ad72623b79e3/
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
> ---
>   package/vlc/vlc.mk | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/package/vlc/vlc.mk b/package/vlc/vlc.mk
> index 0b275f2..13c72ce 100644
> --- a/package/vlc/vlc.mk
> +++ b/package/vlc/vlc.mk
> @@ -251,6 +251,10 @@ endif
>
>   ifeq ($(BR2_PACKAGE_QT_GUI_MODULE),y)
>   VLC_CONF_OPTS += --enable-qt
> +VLC_CONF_ENV += \
> +       ac_cv_path_MOC=$(HOST_DIR)/usr/bin/moc \
> +       ac_cv_path_RCC=$(HOST_DIR)/usr/bin/rcc \
> +       ac_cv_path_UIC=$(HOST_DIR)/usr/bin/uic
>   VLC_DEPENDENCIES += qt
>   else
>   VLC_CONF_OPTS += --disable-qt
>

Tested-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

It also fixes the autobuild failure on MIPS:

 
http://autobuild.buildroot.net/results/06174eaeb7f2b8a591395e607912ad72623b79e3/

-- 
Vicente Olivert Riera
Graduate Software Engineer, MIPS Processor IP
Imagination Technologies Limited
t: +44 (0)113 2429814
www.imgtec.com