Re: [PATCH v4 04/18] ui: avoid warnings about directdb on Alpine / musl libc

[Thomas Huth]

On 24/11/2021 14.01, Daniel P. Berrangé wrote:
On Alpine, SDL is built with directfb support and this triggers warnings
during QEMU build
In file included from /usr/include/directfb/direct/thread.h:38,
                  from /usr/include/directfb/direct/debug.h:43,
                  from /usr/include/directfb/direct/interface.h:36,
                  from /usr/include/directfb/directfb.h:49,
                  from /usr/include/SDL2/SDL_syswm.h:80,
                  from /builds/berrange/qemu/include/ui/sdl2.h:8,
                  from ../ui/sdl2-gl.c:31:
/usr/include/directfb/direct/os/waitqueue.h:41:25: error: redundant 
redeclaration of 'direct_waitqueue_init' [-Werror=redundant-decls]
    41 | DirectResult DIRECT_API direct_waitqueue_init        ( DirectWaitQueue 
*queue );
       |                         ^~~~~~~~~~~~~~~~~~~~~

I think that's a bug in the SDL2 package of Alpine. I've had trouble with 
that one in the past already ... so not sure whether it's our job now to 
work around bugs in that crappy Alpine package... I'd prefer if we simply do 
not compile-test SDL on Alpine instead.

 Thomas