https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87542
Bug ID: 87542
Summary: bogus error on attribute format with a named constant
argument
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
The following program is accepted by GCC and triggers the expected diagnostic:
$ cat x.c && gcc -O2 -S -Wall x.c
enum { n = 1 };
__attribute__ ((format (printf, n, 2))) void f (const char*, ...);
void g (void)
{
f ("%i", "");
}
x.c: In function ‘g’:
x.c:6:8: warning: format ‘%i’ expects argument of type ‘int’, but argument 2
has type ‘char *’ [-Wformat=]
f ("%i", "");
~^ ~~
%s
However, the same program in rejected in C++ with:
x.c:2:65: error: format string has invalid operand number
__attribute__ ((format (printf, n, 2))) void f (const char*, ...);
^
