http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48483
--- Comment #17 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-02-09 11:35:27 UTC --- Clang++ 3.0 warns with -Wuninitialized /tmp/webcompile/_15338_0.cc:7:5: warning: variable 'a' is uninitialized when used within its own initialization [-Wuninitialized] A a(a.i); ~ ^ 1 warning generated. but it doesn't warn for the testcase in comment #2.