[Bug c++/98819] New: -Wall -Wformat-signedness suggests %u for %u

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98819

            Bug ID: 98819
           Summary: -Wall -Wformat-signedness  suggests %u for %u
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Reproduced in latest Godbolt trunk

%u is suggested for %u


#1 with x86-64 gcc (trunk)
<source>: In function 'int main()':
<source>:6:19: warning: format '%u' expects argument of type 'unsigned int',
but argument 2 has type 'int' [-Wformat=]
    6 |     std::printf("%u", CURRENT_YEAR);
      |                  ~^
      |                   |
      |                   unsigned int
      |                  %u
Compiler returned: 0





#include <cstdio>
#define CURRENT_YEAR 2021

int main()
{
    std::printf("%u", CURRENT_YEAR);
}