On Thu, 5 Mar 2026 at 06:19, Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp> wrote:
>
> https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/Warning-Options.html
> > Level 2 warns also about calls that might overflow the destination
> > buffer given an argument of sufficient length or magnitude. At level
> > 2, unknown numeric arguments are assumed to have the minimum
> > representable value for signed types with a precision greater than 1,
> > and the maximum representable value otherwise. Unknown string
> > arguments whose length cannot be assumed to be bounded either by the
> > directive’s precision, or by a finite set of string literals they may
> > evaluate to, or the character array they may point to, are assumed to
> > be 1 character long.
>
> Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
> ---
> meson.build | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/meson.build b/meson.build
> index 414c8ea7e280..cf50bc492f9c 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -692,6 +692,7 @@ warn_flags = [
> '-Wempty-body',
> '-Wendif-labels',
> '-Wexpansion-to-defined',
> + '-Wformat-overflow=2',
> '-Wformat-security',
> '-Wformat-y2k',
> '-Wignored-qualifiers',
I can build with both gcc and clang with this extra warning enabled
without it falling over on anything else, so
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
thanks
-- PMM