https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83936
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-26
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed based on comment #4.
As a side note, the limitation isn't specific to back-ends. The C++ front-end
itself doesn't accept a constexpr string as an argument to an attribute that
expects a string. (For the one attribute the C++ standard specifies that takes
a string argument it requires it to be a string literal. But G++ could accept
constexpr strings in other attributes, target-specific or otherwise, and even
in the standard [[deprecated(msg)]] attribute G++ could accept it as an
extension.)
$ cat t.C && gcc -S -Wall -Wextra -Wpedantic -Wswitch-enum t.C
struct A
{
static constexpr const char msg[] = "string doesn't work";
static constexpr unsigned align = 4;
};
template <class T>
struct B
{
static void foo [[gnu::deprecated (T::msg)]] () { }
typedef int I4 [[gnu::aligned (T::align)]];
};
static_assert (alignof (B<A>::I4) == A::align, "number works");
void h()
{
B<A>::foo ();
}
t.C: In instantiation of ‘struct B<A>’:
t.C:14:29: required from here
t.C:10:15: error: deprecated message is not a string
static void foo [[gnu::deprecated (T::msg)]] () { }
^~~
t.C: In function ‘void h()’:
t.C:18:9: warning: ‘static void B<T>::foo() [with T = A]’ is deprecated
[-Wdeprecated-declarations]
B<A>::foo ();
^~~
t.C:10:15: note: declared here
static void foo [[gnu::deprecated (T::msg)]] () { }
^~~
t.C:18:14: warning: ‘static void B<T>::foo() [with T = A]’ is deprecated
[-Wdeprecated-declarations]
B<A>::foo ();
^
t.C:10:15: note: declared here
static void foo [[gnu::deprecated (T::msg)]] () { }
^~~
