https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77331
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-08-01
CC| |egallager at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #0)
> While getting the latest c-format.c changes integrated into the
> -Wformat-length pass and testing the result I noticed that GCC underlines
> different parts of the format strings than shown in the examples in the
> comment above the definition of the format_warning_va function. The output
> shown in the comments makes sense. The actual output not so much because
> parts of the format strings that are unrelated to the problem are underlined.
>
> $ cat t.c && /build/gcc-trunk/gcc/xgcc -B /build/gcc-trunk/gcc -S -Wformat
> -Wformat-signedness t.c
> extern int printf (const char*, ...);
>
> void f (const char *msg)
> {
> printf ("hello " "%i", msg);
>
> #define INT_FMT "%i"
>
> printf ("hello " INT_FMT " world", msg);
>
> }
> t.c: In function ‘f’:
> t.c:5:11: warning: format ‘%i’ expects argument of type ‘int’, but argument
> 2 has type ‘const char *’ [-Wformat=]
> printf ("hello " "%i", msg);
> ^~~~~~~~
> t.c:5:22: note: format string is defined here
> printf ("hello " "%i", msg);
> ~^
> %s
> t.c:9:11: warning: format ‘%i’ expects argument of type ‘int’, but argument
> 2 has type ‘const char *’ [-Wformat=]
> printf ("hello " INT_FMT " world", msg);
> ^~~~~~~~
> t.c:7:19: note: format string is defined here
> #define INT_FMT "%i"
> ~^
> %s
Confirmed.
