https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78906
Bug ID: 78906
Summary: ICE with a member variable template whose type is a
decltype of a member variable template of a class
template
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ville.voutilainen at gmail dot com
Target Milestone: ---
template <typename> struct A { static constexpr int digits = 0; };
template <typename> struct B {
template <int, typename MaskInt = int, int = A<MaskInt>::digits>
static constexpr int XBitMask = 0;
};
struct C {
using ReferenceHost = B<int>;
template <int> static decltype(ReferenceHost::XBitMask<0>) XBitMask;
};
int main() { C::XBitMask<0>; }
prog.cc:8:62: internal compiler error: Segmentation fault
template <int> static decltype(ReferenceHost::XBitMask<0>) XBitMask;
^~~~~~~~
0xb04b0f crash_signal
/home/heads/gcc/gcc-source/gcc/toplev.c:333
0x615d7c tsubst(tree_node*, tree_node*, int, tree_node*)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13172
0x622612 tsubst_template_args
/home/heads/gcc/gcc-source/gcc/cp/pt.c:11415
0x622ebc tsubst_aggr_type
/home/heads/gcc/gcc-source/gcc/cp/pt.c:11618
0x616399 tsubst(tree_node*, tree_node*, int, tree_node*)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13098
0x62288b tsubst_qualified_id
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13979
0x625f41 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:16550
0x61af77 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:16146
0x62039c coerce_template_parms
/home/heads/gcc/gcc-source/gcc/cp/pt.c:7801
0x620c83 finish_template_variable(tree_node*, int)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:8782
0x620dc6 lookup_and_finish_template_variable
/home/heads/gcc/gcc-source/gcc/cp/pt.c:8820
0x6229a9 tsubst_qualified_id
/home/heads/gcc/gcc-source/gcc/cp/pt.c:14046
0x625f41 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:16550
0x615e51 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13750
0x615e51 tsubst(tree_node*, tree_node*, int, tree_node*)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13750
0x6231fc tsubst_decl
/home/heads/gcc/gcc-source/gcc/cp/pt.c:12511
0x61656f tsubst(tree_node*, tree_node*, int, tree_node*)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13016
0x6159cb instantiate_template_1
/home/heads/gcc/gcc-source/gcc/cp/pt.c:17811
0x6159cb instantiate_template(tree_node*, tree_node*, int)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:17867
0x6c0cba finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kind*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)
/home/heads/gcc/gcc-source/gcc/cp/semantics.c:3689
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
