http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54466
--- Comment #10 from Dodji Seketeli <dodji at gcc dot gnu.org> 2012-11-13 16:07:50 UTC --- Author: dodji Date: Tue Nov 13 16:07:39 2012 New Revision: 193479 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=193479 Log: PR c++/54466 - ICE with alias template which type-id is const qualified Consider this short example: template<typename T> struct X { }; template<typename T> using Y = const X<T>; using Z = Y<int>; G++ crashes in lookup_class_template_1 while trying to build the alias template instantiation Y<int>. I think this is indirectly due to the fact that that lookup_class_template_1 can now yield a const qualified type like 'const X<T>'. As a consequence, the code in lookup_template_class_1 that was trying to access the TYPE_STUB_DECL field of the result of lookup_template_class_1 should now be adjusted to access the TYPE_STUB_DECL of the main variant of the resulting type instead (and that is TYPE_MAIN_DECL); because qualified types (constructed with build_qualified_type) have their TYPE_STUB_DECL set to NULL. Fixed thus and tested on x86_64-unknown-linux-gnu against trunk. gcc/cp PR c++/54466 * pt.c (lookup_template_class_1): TYPE_STUB_DECL should be accessed on the main variant of the type. gcc/testsuite/ * g++.dg/cpp0x/alias-decl-26.C: New test file. In the example of this patch, g++ crashes when trying to build the alias template Y<int Added: trunk/gcc/testsuite/g++.dg/cpp0x/alias-decl-26.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/pt.c trunk/gcc/testsuite/ChangeLog
