[Bug c++/80495] New: attribute [[noreturn]] is accepted in function pointer declarations

[bruno at clisp dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80495

            Bug ID: 80495
           Summary: attribute [[noreturn]] is accepted in function pointer
                    declarations
           Product: gcc
           Version: 6.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bruno at clisp dot org
  Target Milestone: ---

g++ does not flag an error for use of attribute [[noreturn]] on a function
pointer declaration.

C++11 [dcl.attr.noreturn] says "The attribute may be applied to a declarator-id
in a function declaration."

$ cat noreturn1.cc
void func1 (void) { for (;;); }
[[ noreturn ]] void func2 (void) { for (;;); }
__attribute__ ((__noreturn__)) void func3 (void) { for (;;); }

void (*fptr11) (void) = func1;
void (*fptr12) (void) = func2;
void (*fptr13) (void) = func3;

[[ noreturn ]] void (*fptr21) (void) = func1; /* expected: error */
[[ noreturn ]] void (*fptr22) (void) = func2; /* expected: error */
[[ noreturn ]] void (*fptr23) (void) = func3; /* expected: error */

$ g++ --version | head -n 1
g++ (GCC) 6.3.0

$ g++ -std=c++11 -pedantic -c noreturn1.cc