Re: [Qemu-devel] [PATCH for 2.8 3/3] sdl: Modularize

["Daniel P. Berrange" <berrange@redhat.com>]

On Wed, Jul 27, 2016 at 02:26:17PM +0800, Fam Zheng wrote:
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  Makefile.objs         |  1 +
>  configure             |  4 +--
>  include/qemu/module.h |  2 ++
>  include/ui/console.h  |  5 ++--
>  ui/Makefile.objs      |  2 ++
>  ui/sdl-init.c         | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  ui/sdl.c              | 19 ++++++-------
>  ui/sdl2.c             | 26 ++++++------------
>  util/module.c         |  6 +++++
>  vl.c                  |  5 +++-
>  10 files changed, 111 insertions(+), 34 deletions(-)
>  create mode 100644 ui/sdl-init.c

[snip]

> diff --git a/vl.c b/vl.c
> index a455947..fdbbe47 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -4221,7 +4221,10 @@ int main(int argc, char **argv, char **envp)
>      }
>  
>      if (display_type == DT_SDL) {
> -        sdl_display_early_init(request_opengl);
> +        if (!sdl_display_early_init(request_opengl)) {
> +            error_report("Failed to initialize SDL");
> +            exit(1);
> +        }
>      }

SDL has some nasty stuff where it tries to replace main() with
a call to SDL_main on certain platforms. Merely #include'ing
SDL.h in vl.c causes this to happen on Win32 at least, perhaps
other platforms too. I'm unclear if your modularization here
will apply to all platforms or just Linux - g_module at least
can work on Win32.

Anyway, to fully support modularization without nasty surprises,
we probably want to stop this main() replacement.

I sent a patch for that last year

  https://lists.nongnu.org/archive/html/qemu-devel/2015-08/msg01631.html

Regards,
Daniel
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