netdev - Re: [PATCH net-next 2/2] net: rose: Escape trigraph to fix warning with W=1

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Date:   Thu, 29 Oct 2020 15:31:21 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     Jakub Kicinski <kuba@...nel.org>, netdev <netdev@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH net-next 2/2] net: rose: Escape trigraph to fix warning
 with W=1

On Thu, Oct 29, 2020 at 02:19:27PM +0000, David Laight wrote:
> From: Andrew Lunn
> > Sent: 28 October 2020 00:23
> > 
> > net/rose/af_rose.c: In function ‘rose_info_show’:
> > net/rose/af_rose.c:1413:20: warning: trigraph ??- ignored, use -trigraphs to enable [-Wtrigraphs]
> >  1413 |    callsign = "??????-?";
> > 
> > ??- is a trigraph, and should be replaced by a ˜ by the
> > compiler. However, trigraphs are being ignored in the build. Fix the
> > warning by escaping the ?? prefix of a trigraph.
> > 
> > Signed-off-by: Andrew Lunn <andrew@...n.ch>
> > ---
> >  net/rose/af_rose.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
> > index cf7d974e0f61..2c297834d268 100644
> > --- a/net/rose/af_rose.c
> > +++ b/net/rose/af_rose.c
> > @@ -1410,7 +1410,7 @@ static int rose_info_show(struct seq_file *seq, void *v)
> >  			   ax2asc(buf, &rose->dest_call));
> > 
> >  		if (ax25cmp(&rose->source_call, &null_ax25_address) == 0)
> > -			callsign = "??????-?";
> > +			callsign = "????\?\?-?";
> 
> I think I'd just split the string, eg: "?????" "-?".

Humm. I think we need a language lawyer.

Does it concatenate the strings and then evaluate for trigraphs? Or
does it evaluate for trigraphs, and then concatenate the strings?

     Andrew