The following testcase with invalid virtual inheritance ICEs since GCC 4.0.0: ================================== struct A { virtual ~A() {} }; struct B : A, virtual A {}; struct C : A, B {}; C c; ================================== bug.cc:6: error: duplicate base type 'A' invalid bug.cc:8: warning: direct base 'A' inaccessible in 'C' due to ambiguity bug.cc: In destructor 'virtual C::~C()': bug.cc:8: internal compiler error: Segmentation fault Please submit a full bug report, [etc.] A more reduced version crashes since GCC 4.1.0: ================================== struct A {}; struct B : A, virtual A {}; struct C : B {}; ================================== bug.cc:7: error: duplicate base type 'A' invalid bug.cc:9: internal compiler error: Segmentation fault Please submit a full bug report, [etc.]
Subject: Bug number PR c++/27952 A patch for this bug has been added to the patch tracker. The mailing list url for the patch is http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00536.html
Confirmed.
Subject: Bug number PR c++/27952 A patch for this bug has been added to the patch tracker. The mailing list url for the patch is http://gcc.gnu.org/ml/gcc-patches/2006-10/msg00862.html
Subject: Bug number PR c++/27952 A patch for this bug has been added to the patch tracker. The mailing list url for the patch is http://gcc.gnu.org/ml/gcc-patches/2006-10/msg00878.html
Subject: Bug 27952 Author: lmillward Date: Tue Oct 17 23:22:14 2006 New Revision: 117839 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=117839 Log: PR c++/27952 * cp-tree.h (xref_basetypes): Return bool instead of void. * decl.c (xref_basetypes): Adjust definition. Return false if the class bases are invalid. * parser.c (cp_parser_class_head): Check the return value from xref_basetypes. * g++.dg/inherit/virtual1.C: New test. Added: trunk/gcc/testsuite/g++.dg/inherit/virtual1.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/cp-tree.h trunk/gcc/cp/decl.c trunk/gcc/cp/parser.c trunk/gcc/testsuite/ChangeLog
Fixed on mainline.
Won't fix in GCC-4.0.x. Adjusting milestone.
Closing 4.1 branch.