https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61825
--- Comment #8 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Author: hubicka Date: Fri Sep 19 23:56:52 2014 New Revision: 215409 URL: https://gcc.gnu.org/viewcvs?rev=215409&root=gcc&view=rev Log: PR c++/61825 * c-family/c-common.c (handle_alias_ifunc_attribute): Check that visibility change is possible (handle_weakref_attribute): Likewise. * cgraph.h (symtab_node): Add method get_create and field refuse_visibility_changes. (symtab_node::get_create): New method. * fold-const.c (tree_single_nonzero_warnv_p): Use get_create. * varasm.c (mark_weak): Verify that visibility change is possible. * gcc.dg/tree-ssa/nonzero-1.c: Require error to be output. Modified: trunk/gcc/ChangeLog trunk/gcc/c-family/c-common.c trunk/gcc/cgraph.h trunk/gcc/fold-const.c trunk/gcc/symtab.c trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/tree-ssa/nonzero-1.c trunk/gcc/varasm.c
