https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81260
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-06-30
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |5.3.0, 6.3.0, 7.1.0, 8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with the smaller test case below and all of 5.x, 6.x, 7.x, and 8.0.
The expected warning is issued when the class is empty (in g()) but not
otherwise. Interestingly, Clang only diagnoses the first call to f() in both
functions, maybe because it "forgets" about the temporary as it passes through
the implicitly generate copy assignment operator in the second call.
$ cat t.C && gcc -S -Wall -Wextra -Wpedantic t.C
void f (void*);
struct A { A (int); };
struct B
{
B (int);
int i;
};
void g ()
{
f (&(A (1)));
f (&(A (1) = 1));
}
void h ()
{
f (&(B (1)));
f (&(B (1) = 1));
}
t.C: In function ‘void g()’:
t.C:13:13: error: taking address of temporary [-fpermissive]
f (&(A (1)));
^
t.C:14:17: error: taking address of temporary [-fpermissive]
f (&(A (1) = 1));
^
t.C: In function ‘void h()’:
t.C:19:13: error: taking address of temporary [-fpermissive]
f (&(B (1)));
^
