[Buildroot] [PATCH v4 00/14] Add Xorg support for iMX6

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear J?r?me Pouiller,

On Thu, 04 Dec 2014 22:19:13 +0100, J?r?me Pouiller wrote:

> It looks like you enabled EGLFS in Qt5. EGLFS need framebuffer version of gpu-
> viv-bin-mx6q. If you want to use X11, you have to enable xcb in qt5 (as in 
> example in commit log of "07/14 xdriver_xf86-video-imx-viv").
> 
> I do not see any simple generic solution to prevent user to choose EGLFS in Qt 
> if X11 backend is selected in gpu-viv-bin-mx6q :-(

Well, we could always imagine something like:

config BR2_PACKAGE_QT5BASE_XCB
        bool "X.org XCB support"
        depends on BR2_PACKAGE_XORG7
        select BR2_PACKAGE_XLIB_LIBX11
        select BR2_PACKAGE_LIBXCB
        select BR2_PACKAGE_XCB_UTIL_IMAGE
        select BR2_PACKAGE_XCB_UTIL_KEYSYMS
        select BR2_PACKAGE_XCB_UTIL_WM
        select BR2_PACKAGE_LIBXKBCOMMON
+	depends on BR2_PACKAGE_GPU_VIV_BIN_MX6Q_OUTPUT_X11 if BR2_PACKAGE_GPU_VIV_BIN_MX6Q

comment "X.org XCB backend available if X.org is enabled"
        depends on !BR2_PACKAGE_XORG7

+comment "X11 backend of gpu-viv-bin-mx6q needed to enable XCB"
+	depends on BR2_PACKAGE_GPU_VIV_BIN_MX6Q && !BR2_PACKAGE_GPU_VIV_BIN_MX6Q_OUTPUT_X11

config BR2_PACKAGE_QT5BASE_EGLFS
        bool "eglfs support"
        select BR2_PACKAGE_QT5BASE_OPENGL
        depends on BR2_PACKAGE_HAS_LIBEGL
        depends on BR2_PACKAGE_QT5_GL_AVAILABLE
+	depends on BR2_PACKAGE_GPU_VIV_BIN_MX6Q_OUTPUT_FB if BR2_PACKAGE_GPU_VIV_BIN_MX6Q

+comment "FB backend of gpu-viv-bin-mx6q needed to enable EGLFS"
+	depends on BR2_PACKAGE_GPU_VIV_BIN_MX6Q && !BR2_PACKAGE_GPU_VIV_BIN_MX6Q_OUTPUT_FB

comment "eglfs backend available if OpenGL and EGL are enabled"
        depends on !BR2_PACKAGE_HAS_LIBEGL || !BR2_PACKAGE_QT5_GL_AVAILABLE

For sure, it's not very generic, but at least it lets the user know
about this dependency, which is not very obvious.

But I am wondering, for the X11 output to work, don't you also need the
BR2_PACKAGE_XDRIVER_XF86_VIDEO_IMX_VIV option ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com