http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55739
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-19 13:26:34 UTC --- That is not a bug, it can't. Asan needs to insert padding after it, but you don't know if the symbol will be defined by the current CU, or some other, and whether there will be padding inserted after it or not. Just use -fno-common if the program doesn't assume common symbol behavior to instrument those.
