[PATCH weston] simple-dmabuf-drm: fix build with --disable-egl

[Emilio Pozuelo Monfort]

On 03/07/18 11:00, Pekka Paalanen wrote:
> On Mon,  2 Jul 2018 17:22:30 +0200
> Emilio Pozuelo Monfort <pochu27 at gmail.com> wrote:
> 
>> Signed-off-by: Emilio Pozuelo Monfort <emilio.pozuelo at collabora.co.uk>
>> ---
>> I tried a build with --disable-egl as I didn't have the headers
>> installed, and it broke here. The EGL usage here seemed optional so I
>> did that, but I didn't run-test the result. If it would make more sense
>> to disable the client if EGL support is disabled I can do that.
>>
>>  clients/simple-dmabuf-drm.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/clients/simple-dmabuf-drm.c b/clients/simple-dmabuf-drm.c
>> index fcab30e5..1ae3a2dd 100644
>> --- a/clients/simple-dmabuf-drm.c
>> +++ b/clients/simple-dmabuf-drm.c
>> @@ -863,6 +863,7 @@ create_display(int opts, int format)
>>  	display->req_dmabuf_immediate = opts & OPT_IMMEDIATE;
>>  	display->req_dmabuf_modifiers = (format == DRM_FORMAT_NV12);
>>  
>> +#if ENABLE_EGL
>>  	/*
>>  	 * hard code format if the platform egl doesn't support format
>>  	 * querying / advertising.
>> @@ -871,6 +872,7 @@ create_display(int opts, int format)
>>  	if (extensions && !weston_check_egl_extension(extensions,
>>  				"EGL_EXT_image_dma_buf_import_modifiers"))
>>  		display->xrgb8888_format_found = 1;
>> +#endif
>>  
>>  	display->registry = wl_display_get_registry(display->display);
>>  	wl_registry_add_listener(display->registry,
> 
> Hi,
> 
> that's very strange. This program does not use EGL or even GBM, that's
> a completely dead hunk of code you're ifdeffing there as I can see.
> Would be better to just remove it completely, and make sure the build
> does not link libEGL or GBM. Include for shared/platform.h should be
> useless too.

It's not dead code, it's a fallback mechanism in case the EGL platform doesn't
support EGL_EXT_image_dma_buf_import_modifiers. The problem is that configure.ac
checks for EGL for simple-dmabuf-drm-client, but the client is not disabled if
one builds with --disable-egl. Perhaps I should do that instead. After all,
disable-egl disables the gl-renderer, which is needed for zwp_linux_dmabuf,
which is needed by simple-dmabuf-drm-client.

Thoughts?

Emilio