[PATCH v5] perf tools: Fix arm64 build error with gcc-11

[Arnaldo Carvalho de Melo]

Em Thu, Feb 18, 2021 at 09:26:17AM +0000, John Garry escreveu:
> On 18/02/2021 03:12, Jianlin Lv wrote:
> > gcc version: 11.0.0 20210208 (experimental) (GCC)
> > 
> > Following build error on arm64:
> > 
> > .......
> > In function ‘printf’,
> >      inlined from ‘regs_dump__printf’ at util/session.c:1141:3,
> >      inlined from ‘regs__printf’ at util/session.c:1169:2:
> > /usr/include/aarch64-linux-gnu/bits/stdio2.h:107:10: \
> >    error: ‘%-5s’ directive argument is null [-Werror=format-overflow=]
> > 
> > 107 |   return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, \
> >                  __va_arg_pack ());
> > 
> > ......
> > In function ‘fprintf’,
> >    inlined from ‘perf_sample__fprintf_regs.isra’ at \
> >      builtin-script.c:622:14:
> > /usr/include/aarch64-linux-gnu/bits/stdio2.h:100:10: \
> >      error: ‘%5s’ directive argument is null [-Werror=format-overflow=]
> >    100 |   return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
> >    101 |                         __va_arg_pack ());
> > 
> > cc1: all warnings being treated as errors
> > .......
> > 
> > This patch fixes Wformat-overflow warnings. Add helper function to
> > convert NULL to "unknown".
> > 
> > Signed-off-by: Jianlin Lv<Jianlin.Lv at arm.com>
> 
> thanks
> Reviewed-by: John Garry <john.garry at huawei.com>


Thanks, applied.

- Arnaldo