Re: [Qemu-devel] [PATCH] libcacard: Fix compilation for older versions of glib (bug #1258168)

[Don Slutz]

On 12/05/13 12:24, Stefan Weil wrote:
> See https://bugs.launchpad.net/bugs/1258168
>
> libcacard/vscclient.c: In function 'do_socket_read':
> libcacard/vscclient.c:410: warning: implicit declaration of function 
> 'g_warn_if_reached'
> libcacard/vscclient.c:410: warning: nested extern declaration of 
> 'g_warn_if_reached'
> libcacard/vscclient.c: In function 'main':
> libcacard/vscclient.c:763: warning: implicit declaration of function 
> 'g_byte_array_unref'
> libcacard/vscclient.c:763: warning: nested extern declaration of 
> 'g_byte_array_unref'
> ...
> libcacard/vscclient.o: In function `do_socket_read':
> libcacard/vscclient.c:410: undefined reference to `g_warn_if_reached'
> libcacard/vscclient.o: In function `main':
> libcacard/vscclient.c:763: undefined reference to `g_byte_array_unref'
>
> g_warn_if_reached was added in glib 2.16, and g_byte_array_unref is
> supported since glib 2.22. QEMU requires glib 2.16, so both names must
> not be used.
>
> Instead of showing a warning for code which should not be reached, QEMU
> better stops running, so g_warn_if_reached is not useful for QEMU.
>
> In libcacard/vsclient.c, g_byte_array_unref can be replaced by
> g_byte_array_free. This is not generally true, so adding a compatibility
> layer in include/glib-compat.h is no option here.
>
> Reported-by: Laurent Desnogues <address@hidden>
> Reported-by: Don Slutz <address@hidden>
> Signed-off-by: Stefan Weil <address@hidden>
> ---
>   libcacard/vscclient.c |    4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libcacard/vscclient.c b/libcacard/vscclient.c
> index a3cb776..138b9e5 100644
> --- a/libcacard/vscclient.c
> +++ b/libcacard/vscclient.c
> @@ -407,7 +407,7 @@ do_socket_read(GIOChannel *source,
>               }
>               break;
>           default:
> -            g_warn_if_reached();
> +            g_assert_not_reached();
>               return FALSE;
>           }
>   
> @@ -760,7 +760,7 @@ main(
>   
>       g_io_channel_unref(channel_stdin);
>       g_io_channel_unref(channel_socket);
> -    g_byte_array_unref(socket_to_send);
> +    g_byte_array_free(socket_to_send);
>   
This fails with:

/home/don/qemu/libcacard/vscclient.c: In function 'main':
/home/don/qemu/libcacard/vscclient.c:763: error: too few arguments to function 
'g_byte_array_free'
make: *** [libcacard/vscclient.o] Error 1

The bug included ", TRUE"...
   -Don Slutz
>       closesocket(sock);
>       return 0;