https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77331
Bug ID: 77331
Summary: incorrect range location in -Wformat with a
concatenated format literal
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
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
