Re: [RFC PATCH-for-6.2] ui/gtk-egl: Fix build failure when libgbm is not available

[Paolo Bonzini <pbonzini@redhat.com>]

On 11/8/21 09:31, Philippe Mathieu-Daudé wrote:
> Since commit 4872a023a59 ("ui/gtk-egl: guest fb texture needs
> to be regenerated when reinitializing egl") we get on Ubuntu
> 18.04.4 LTS and Debian Buster (oldstable):
> 
>    $ ../configure --enable-virglrenderer
>    [...]
>    ui/gtk-egl.c: In function 'gd_egl_refresh':
>    ui/gtk-egl.c:159:13: error: implicit declaration of function 'egl_dmabuf_release_texture' [-Werror=implicit-function-declaration]
>      159 |             egl_dmabuf_release_texture(vc->gfx.guest_fb.dmabuf);
>          |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
>    ui/gtk-egl.c:159:13: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
>    ui/gtk-egl.c:159:13: error: nested extern declaration of 'egl_dmabuf_release_texture' [-Werror=nested-externs]
> 
> Fix by restricting the egl_dmabuf_release_texture() call to the
> availability of the generic buffer management library (libgbm).

Matches other uses of the variable; queued the patch, thanks.

Paolo

> Fixes: 4872a023a593e6519b272a
> Cc: Dongwon Kim <dongwon.kim@intel.com>
> Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
> Reported-by: Laurent Vivier <laurent@vivier.eu>
> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>   ui/gtk-egl.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
> index f2026e4b5c9..45cb67712df 100644
> --- a/ui/gtk-egl.c
> +++ b/ui/gtk-egl.c
> @@ -155,10 +155,12 @@ void gd_egl_refresh(DisplayChangeListener *dcl)
>               surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
>               surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
>           }
> +#ifdef CONFIG_GBM
>           if (vc->gfx.guest_fb.dmabuf) {
>               egl_dmabuf_release_texture(vc->gfx.guest_fb.dmabuf);
>               gd_egl_scanout_dmabuf(dcl, vc->gfx.guest_fb.dmabuf);
>           }
> +#endif
>       }
>   
>       graphic_hw_update(dcl->con);
>