http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53863
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |diagnostic --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-05 10:45:51 UTC --- In the words of the C++ standard "a = 1" is an "enumerator-definition", which declares the name "a" (EDG says declaration for C and C++, Clang says definition for C and C++) I think the reason for the G++ wording is that the same diagnostic is used in this case: extern int a; extern long a; t.cc:2:13: error: conflicting declaration 'long int a' t.cc:1:12: error: 'a' has a previous declaration as 'int a' And in this case they are declarations, not definitions. Interestingly the C front end gives a different diagnostic here, changing "definition" to "declaration" t.c:2:13: error: conflicting types for 'a' t.c:1:12: note: previous declaration of 'a' was here