[Bug c++/17256] New: undefined but used static or inline functions should be diagnosed

["jsm28 at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

inline static void f1(void);
void g1(void) { if (0) { f1(); } }

violates the requirement that "An inline function shall be defined in every
translation unit in which it is used." [basic.odr] paragraph 3, so should be
diagnosed ("used" having a specific definition which covers this case).
The diagnostic should be a pedwarn rather than the existing warning for
inline functions that aren't defined.

Much the same code would probably also facilitate diagnosing the simple
ODR violation, no diagnostic required, where "inline" is removed from
the declaration of f1.

-- 
           Summary: undefined but used static or inline functions should be
                    diagnosed
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jsm28 at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17256