[Bug c++/84222] [6/7/8 Regression] [[deprecated]] class complains about internal class usage

["msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84222

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
                 CC|                            |msebor at gcc dot gnu.org
      Known to work|                            |4.2.3
            Summary|[[deprecated]] class        |[6/7/8 Regression]
                   |complains about internal    |[[deprecated]] class
                   |class usage                 |complains about internal
                   |                            |class usage
      Known to fail|                            |4.3.4, 4.5.4, 4.8.3, 4.9.3,
                   |                            |5.3.0, 6.2.0, 7.1.0, 8.0

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with the following simplified C++ 98 test case:

$ cat pr84222.C && gcc -O2 -c -g -Wall pr84222.C
struct __attribute__ ((deprecated)) C {
    C() {}
    C(const C&);  // emits a deprecation warning
};
pr84222.C:3:15: warning: ‘C’ is deprecated [-Wdeprecated-declarations]
     C(const C&);  // emits a deprecation warning
               ^

It's a very old regression introduced in GCC 4.3.  The likely candidate is 
r128691:

        PR c++/16370
        * decl.c (grokdeclarator): Look through implicit TYPE_DECLs
        for deprecation warnings.