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From: "jg at jguk dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96412] New: format suggestion issue
Date: Sat, 01 Aug 2020 17:17:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96412

            Bug ID: 96412
           Summary: format suggestion issue
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Running on godbolt trunk

The suggestion is '%ld' in green type colour in the terminal, but should it
actually be '%zu' ?=20

-Wformat-signedness -Wall



#include <cstdio>
int main()
{
size_t i =3D 0;
printf("%ld\n", i);
}



#1 with x86-64 gcc (trunk)
<source>: In function 'int main()':

<source>:5:11: warning: format '%ld' expects argument of type 'long int', b=
ut
argument 2 has type 'size_t' {aka 'long unsigned int'} [-Wformat=3D]

    5 | printf("%ld\n", i);

      |         ~~^     ~

      |           |     |

      |           |     size_t {aka long unsigned int}

      |           long int

      |         %ld

Compiler returned: 0=