The code: struct A {int* next; }; struct B {int* next; }; struct C : public A, public B { using A::next; }; void foo(C* c) { c->next = 0; } gets you: ~/ootbc/sim$ g++ foo.cc foo.cc: In function `void foo(C*)': foo.cc:4: error: request for member `next' is ambiguous foo.cc:2: error: candidates are: int*B::next foo.cc:1: error: int*A::next Compiles OK on Comeau. Ivan
This is related to PR 25994.
Mine...
Author: jason Date: Mon Nov 14 17:55:57 2011 New Revision: 181359 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181359 Log: PR c++/6936 PR c++/25994 PR c++/26256 PR c++/30195 * search.c (lookup_field_1): Look through USING_DECL. (lookup_field_r): Call lookup_fnfields_slot instead of lookup_fnfields_1. * semantics.c (finish_member_declaration): Remove the check that prevents USING_DECLs from being verified by pushdecl_class_level. Call add_method for using declarations that designates functions if the using declaration is in a template class. Set DECL_IGNORED_P on class-scope using declarations. * typeck.c (build_class_member_access_expr): Handle USING_DECLs. * class.c (check_field_decls): Keep using declarations. (add_method): Remove two diagnostics about conflicting using declarations. * parser.c (cp_parser_nonclass_name): Handle USING_DECLs. * decl.c (start_enum): Call xref_tag whenever possible. * cp-tree.h (strip_using_decl): Declare, and reident the previous function. * name-lookup.c (strip_using_decl): New function. (supplement_binding_1): Call strip_using_decl on decl and bval. Perform most of the checks with USING_DECLs stripped. Also check that the target decl and the target bval does not refer to the same declaration. Allow pushing an enum multiple times in a template class. Adjustment to diagnose using redeclarations. Call diagnose_name_conflict. (push_class_level_binding): Call strip_using_decl on decl and bval. Perform most of the checks with USING_DECLs stripped. Return true if both decl and bval refer to USING_DECLs and are dependent. (diagnose_name_conflict): New function. Added: trunk/gcc/testsuite/g++.dg/cpp0x/forw_enum10.C trunk/gcc/testsuite/g++.dg/debug/using4.C trunk/gcc/testsuite/g++.dg/debug/using5.C trunk/gcc/testsuite/g++.dg/lookup/pr6936.C trunk/gcc/testsuite/g++.dg/lookup/using24.C trunk/gcc/testsuite/g++.dg/lookup/using25.C trunk/gcc/testsuite/g++.dg/lookup/using26.C trunk/gcc/testsuite/g++.dg/lookup/using27.C trunk/gcc/testsuite/g++.dg/lookup/using28.C trunk/gcc/testsuite/g++.dg/lookup/using29.C trunk/gcc/testsuite/g++.dg/lookup/using30.C trunk/gcc/testsuite/g++.dg/lookup/using31.C trunk/gcc/testsuite/g++.dg/lookup/using32.C trunk/gcc/testsuite/g++.dg/lookup/using33.C trunk/gcc/testsuite/g++.dg/lookup/using34.C trunk/gcc/testsuite/g++.dg/lookup/using35.C trunk/gcc/testsuite/g++.dg/lookup/using36.C trunk/gcc/testsuite/g++.dg/lookup/using37.C trunk/gcc/testsuite/g++.dg/lookup/using38.C trunk/gcc/testsuite/g++.dg/lookup/using39.C trunk/gcc/testsuite/g++.dg/lookup/using40.C trunk/gcc/testsuite/g++.dg/lookup/using41.C trunk/gcc/testsuite/g++.dg/lookup/using42.C trunk/gcc/testsuite/g++.dg/lookup/using44.C trunk/gcc/testsuite/g++.dg/lookup/using45.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/class.c trunk/gcc/cp/cp-tree.h trunk/gcc/cp/decl.c trunk/gcc/cp/name-lookup.c trunk/gcc/cp/parser.c trunk/gcc/cp/search.c trunk/gcc/cp/semantics.c trunk/gcc/cp/typeck.c trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/g++.dg/abi/mangle41.C trunk/gcc/testsuite/g++.dg/inherit/using4.C trunk/gcc/testsuite/g++.dg/lookup/name-clash9.C trunk/gcc/testsuite/g++.dg/parse/ctor5.C trunk/gcc/testsuite/g++.dg/template/static4.C trunk/gcc/testsuite/g++.dg/template/typedef1.C trunk/gcc/testsuite/g++.dg/template/using2.C trunk/gcc/testsuite/g++.old-deja/g++.brendan/misc14.C trunk/gcc/testsuite/g++.old-deja/g++.bugs/900127_02.C trunk/gcc/testsuite/g++.old-deja/g++.jason/scoping16.C trunk/gcc/testsuite/g++.old-deja/g++.other/anon7.C trunk/gcc/testsuite/g++.old-deja/g++.other/redecl1.C trunk/gcc/testsuite/g++.old-deja/g++.other/typedef7.C trunk/gcc/testsuite/g++.old-deja/g++.other/using1.C
Fixed.