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[Bug c++/54466] [C++11] Recursive Type Alias, Member Function Pointer, Segmentation Fault
- From: "dodji at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 13 Nov 2012 16:07:50 +0000
- Subject: [Bug c++/54466] [C++11] Recursive Type Alias, Member Function Pointer, Segmentation Fault
- Auto-submitted: auto-generated
- References: <bug-54466-4@http.gcc.gnu.org/bugzilla/>
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