Re: [Xen-devel] [PATCH] libxl: compilation warning fix for arm & aarch64

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Jul 27, 2016 at 04:01:26PM -0400, Chris Patterson wrote:
> From: Chris Patterson <pattersonc@xxxxxxxxxxxx>
> 
> GCC 6 will warn on unused static const variables in c modules:
> https://gcc.gnu.org/ml/gcc-patches/2015-09/msg00847.html
> 
> When compiling with LIBXL_HAVE_NO_SUSPEND_RESUME set (arm & aarch64),
> the compiler emits the following errors:
>   xl_cmdimpl.c:101:19: error: 'migrate_report'
>       defined but not used [-Werror=unused-const-variable=]
>   xl_cmdimpl.c:99:19: error: 'migrate_permission_to_go'
>       defined but not used [-Werror=unused-const-variable=]
>   xl_cmdimpl.c:97:19: error: 'migrate_receiver_ready'
>       defined but not used [-Werror=unused-const-variable=]
>   xl_cmdimpl.c:95:19: error: 'migrate_receiver_banner'
>       defined but not used [-Werror=unused-const-variable=]
> 
> These unused const variables are only used in functions which exist between
> the ifndef block:
>    #ifndef LIBXL_HAVE_NO_SUSPEND_RESUME
>    ...
>    #endif
> 
> Wrap the same ifndef around these variables.
> 
> Signed-off-by: Chris Patterson <pattersonc@xxxxxxxxxxxx>

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

> ---
>  tools/libxl/xl_cmdimpl.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
> index d1fcfa4..ada8178 100644
> --- a/tools/libxl/xl_cmdimpl.c
> +++ b/tools/libxl/xl_cmdimpl.c
> @@ -92,6 +92,7 @@ static int fd_lock = -1;
>  static const char savefileheader_magic[32]=
>      "Xen saved domain, xl format\n \0 \r";
>  
> +#ifndef LIBXL_HAVE_NO_SUSPEND_RESUME
>  static const char migrate_receiver_banner[]=
>      "xl migration receiver ready, send binary domain data.\n";
>  static const char migrate_receiver_ready[]=
> @@ -100,6 +101,8 @@ static const char migrate_permission_to_go[]=
>      "domain is yours, you are cleared to unpause";
>  static const char migrate_report[]=
>      "my copy unpause results are as follows";
> +#endif
> +
>    /* followed by one byte:
>     *     0: everything went well, domain is running
>     *            next thing is we all exit
> -- 
> 2.1.4
> 

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