[Bug c/85948] New: printf format attribute warning line carat inaccurate

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85948

            Bug ID: 85948
           Summary: printf format attribute warning line carat inaccurate
           Product: gcc
           Version: 8.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Created attachment 44194
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44194&action=edit
main

Reproduced in 8.1 and 5.4

1. I noticed the line carat 9 below is not accurate for the printf format
specifier

2. The later two also has missing carat lines.

3. Output below, and then expected output aafter

Output:

$ gcc -o main main.c -Wall -Werror -Wconversion
main.c: In function ‘main’:
main.c:19:9: error: format ‘%s’ expects argument of type ‘char *’, but argument
2 has type ‘int’ [-Werror=format=]
 str_fmt("%s %zu %s %s", d, str, str, d);
         ^
main.c:19:9: error: format ‘%zu’ expects argument of type ‘size_t’, but
argument 3 has type ‘const char *’ [-Werror=format=]
main.c:19:9: error: format ‘%s’ expects argument of type ‘char *’, but argument
5 has type ‘int’ [-Werror=format=]
cc1: all warnings being treated as errors


Expected:

$ gcc -o main main.c -Wall -Werror -Wconversion
main.c: In function ‘main’:
main.c:19:10: error: format ‘%s’ expects argument of type ‘char *’, but
argument 2 has type ‘int’ [-Werror=format=]
 str_fmt("%s %zu %s %s", d, str, str, d);
          ^
main.c:19:13: error: format ‘%zu’ expects argument of type ‘size_t’, but
argument 3 has type ‘const char *’ [-Werror=format=]
 str_fmt("%s %zu %s %s", d, str, str, d);
             ^
main.c:19:20: error: format ‘%s’ expects argument of type ‘char *’, but
argument 5 has type ‘int’ [-Werror=format=]
 str_fmt("%s %zu %s %s", d, str, str, d);
                    ^
cc1: all warnings being treated as errors