[PATCH] Cygwin: Suppress a warning generated with w32api >= 12.0.0

[Takashi Yano]

On Fri,  7 Jun 2024 17:37:24 +0100
Jon Turney wrote:
> w32api 12.0.0 adds the returns_twice attribute to RtlCaptureContext().
> There's some data-flow interaction with using it inside a while loop
> which causes a maybe-uninitialized warning.
> 
> ../../../../winsup/cygwin/exceptions.cc: In member function 'int _cygtls::call_signal_handler()':                                                                                                │
> ../../../../winsup/cygwin/exceptions.cc:1720:33: error: '<anonymous>' may be used uninitialized in this function [-Werror=maybe-uninitialized]                                                   │
> ---
>  winsup/cygwin/exceptions.cc | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
> index a2a6f9d4c..28d0431d5 100644
> --- a/winsup/cygwin/exceptions.cc
> +++ b/winsup/cygwin/exceptions.cc
> @@ -1717,7 +1717,10 @@ _cygtls::call_signal_handler ()
>  		 context, unwind to the caller and in case we're called
>  		 from sigdelayed, fix the instruction pointer accordingly. */
>  	      context.uc_mcontext.ctxflags = CONTEXT_FULL;
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
>  	      RtlCaptureContext ((PCONTEXT) &context.uc_mcontext);
> +#pragma GCC diagnostic pop
>  	      __unwind_single_frame ((PCONTEXT) &context.uc_mcontext);
>  	      if (stackptr > stack)
>  		{
> -- 
> 2.45.1

It seems that the commit message include non UTF-8 chars.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>