On Tue, 23 Nov 2021, Daniil Stas via Gcc-patches wrote: > On Mon, 22 Nov 2021 20:35:03 +0000 > Joseph Myers <jos...@codesourcery.com> wrote: > > > On Sun, 21 Nov 2021, Daniil Stas via Gcc-patches wrote: > > > > > This option is enabled by default when -Wformat option is enabled. A > > > user can specify -Wno-format-int-precision to disable emitting > > > warnings when passing an argument of an incompatible integer type to > > > a 'd', 'i', 'o', 'u', 'x', or 'X' conversion specifier when it has > > > the same precision as the expected type. > > > > I'd expect this to apply to 'b' and 'B' as well (affects commit > > message, ChangeLog entry, option help string, documentation). > > > > Hi Joseph, > > I can't find any description of these specifiers anywhere. And looks
They're new specifiers in C23. See the most recent working draft <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2731.pdf>. > like gcc doesn't recognize them when I try to compile a sample program GCC should recognize them (i.e., not warn about them with -Wformat) if you have commit bd6f2c63168e89bede631daf8b673eab16acc747 (12 October). > with them (I just get %B printed when I run the program). If you want runtime support for those specifiers in printf, you'll need a libc implementation with support for them. In glibc that means commit 309548bec3b89022bbc81a372ec3e9240211d799 (10 November) or later, for example. -- Joseph S. Myers jos...@codesourcery.com
