Re: [platform-testers] texinfo-6.6.90 pretest

[Eli Zaretskii]

> From: Bruno Haible <address@hidden>
> Cc: Eli Zaretskii <address@hidden>, Gavin Smith <address@hidden>, 
> address@hidden
> Date: Mon, 19 Aug 2019 22:35:45 +0200
> 
> Eli Zaretskii wrote:
> > One other issue is that GCC 8 flags many uses of strncat in
> > install-info.c as unsafe:
> > 
> >      install-info.c: In function 'split_entry':
> >      install-info.c:1624:17: warning: 'strncat' specified bound 2 equals 
> > source length [-Wstringop-overflow=]
> >                       strncat (*description, "  ", 2);
> >                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 
> 
> The warnings are clearly pointless, because the amount of memory
> allocated for *description is unknown to the compiler.
> 
> Which GCC options did you specify?

I didn't specify any options, the options in effect were those that
the Texinfo build system specifies.

> The GCC documentation [1] explains that -Wstringop-overflow=3 and
> -Wstringop-overflow=4 "may result in warnings for safe code".

The GCC manual also says that -Wstringop-overflow is enabled by
default, so maybe it isn't surprising that we see the warnings.