Re: [Qemu-devel] [PATCH for-2.10] util/oslib-posix.c: Avoid warning on NetBSD

[Eric Blake]

On 07/20/2017 11:32 AM, Peter Maydell wrote:
> On NetBSD the compiler warns:
> util/oslib-posix.c: In function 'sigaction_invoke':
> util/oslib-posix.c:589:5: warning: missing braces around initializer 
> [-Wmissing-braces]
>      siginfo_t si = { 0 };
>      ^

Uggh. That is a broken compiler.  C99 declares that 'anything = {0}' is
supposed to be a valid way to zero-initialize anything.

> util/oslib-posix.c:589:5: warning: (near initialization for 'si.si_pad') 
> [-Wmissing-braces]
> 
> because on this platform siginfo_t is defined as
>   typedef union siginfo {
>           char    si_pad[128];    /* Total size; for future expansion */
>           struct _ksiginfo _info;
>   } siginfo_t;
> 
> Avoid this warning by initializing the struct with {} instead;
> this is a GCC extension but we use it all over the codebase already.

Well, I'm glad that works to shut up the broken compiler.

> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  util/oslib-posix.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Eric Blake <address@hidden>

> 
> diff --git a/util/oslib-posix.c b/util/oslib-posix.c
> index b2dea48..cacf0ef 100644
> --- a/util/oslib-posix.c
> +++ b/util/oslib-posix.c
> @@ -586,7 +586,7 @@ void qemu_free_stack(void *stack, size_t sz)
>  void sigaction_invoke(struct sigaction *action,
>                        struct qemu_signalfd_siginfo *info)
>  {
> -    siginfo_t si = { 0 };
> +    siginfo_t si = {};
>      si.si_signo = info->ssi_signo;
>      si.si_errno = info->ssi_errno;
>      si.si_code = info->ssi_code;
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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