https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77328
Bug ID: 77328
Summary: incorrect caret location in -Wformat calling printf
via a macro
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: ---
With recent improvements to token location range information, GCC has started
to underline entire format directives in -Wformat diagnostics issued for calls
to functions like printf. However, when the function invocation happens as a
result of even simple macro expansion, the caret is still in the wrong place:
$ cat t.c && /build/gcc-trunk/gcc/xgcc -B /build/gcc-trunk/gcc -S -Wformat t.c
void f (void)
{
char d [8];
#define P(d, f, a, b) __builtin_sprintf (d, f, a, b)
__builtin_sprintf (d, "%i %i", 1, 2.0);
P (d, "%i %i", 1, 2.0);
}
t.c: In function ‘f’:
t.c:7:30: warning: format ‘%i’ expects argument of type ‘int’, but argument 4
has type ‘double’ [-Wformat=]
__builtin_sprintf (d, "%i %i", 1, 2.0);
~^
%f
t.c:9:9: warning: format ‘%i’ expects argument of type ‘int’, but argument 4
has type ‘double’ [-Wformat=]
P (d, "%i %i", 1, 2.0);
^
t.c:5:45: note: in definition of macro ‘P’
#define P(d, f, a, b) __builtin_sprintf (d, f, a, b)
^
