https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71513
Bug ID: 71513
Summary: ICE on valid C++11 code (with alignas specifier) on
x86_64-linux-gnu: Segmentation fault
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The following C++11 code causes an ICE when compiled with the current GCC trunk
on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It also affects 6.1.x and is a regression from 5.4.x.
$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160612 (experimental) [trunk revision 237336] (GCC)
$
$ g++-5.4 -std=c++11 -c small.cpp
$ clang++-3.8 -std=c++11 -c small.cpp
$
$ g++-trunk -std=c++11 -c small.cpp
small.cpp: In instantiation of ‘class A<1, char>’:
small.cpp:7:15: required from here
small.cpp:4:24: internal compiler error: Segmentation fault
enum alignas (N) E : T;
^
0xdb2b7f crash_signal
../../gcc-source-trunk/gcc/toplev.c:335
0x6fd083 contains_struct_check
../../gcc-source-trunk/gcc/tree.h:3143
0x6fd083 tsubst_attributes
../../gcc-source-trunk/gcc/cp/pt.c:9669
0x6fd083 lookup_template_class_1
../../gcc-source-trunk/gcc/cp/pt.c:8425
0x6fd083 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
../../gcc-source-trunk/gcc/cp/pt.c:8654
0x6feb0b tsubst_aggr_type
../../gcc-source-trunk/gcc/cp/pt.c:11437
0x6e7df7 tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:12908
0x6f0425 tsubst_decl
../../gcc-source-trunk/gcc/cp/pt.c:12229
0x6e81fe tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:12829
0x71bb64 instantiate_class_template_1
../../gcc-source-trunk/gcc/cp/pt.c:10091
0x71bb64 instantiate_class_template(tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:10372
0x7be313 complete_type(tree_node*)
../../gcc-source-trunk/gcc/cp/typeck.c:132
0x683ee8 start_decl_1(tree_node*, bool)
../../gcc-source-trunk/gcc/cp/decl.c:5070
0x6aacad start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
../../gcc-source-trunk/gcc/cp/decl.c:5033
0x7aa4b2 cp_parser_init_declarator
../../gcc-source-trunk/gcc/cp/parser.c:18566
0x7ab009 cp_parser_simple_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12378
0x7ab311 cp_parser_block_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12246
0x7b46f0 cp_parser_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12143
0x7b31c4 cp_parser_declaration_seq_opt
../../gcc-source-trunk/gcc/cp/parser.c:12022
0x7b34f8 cp_parser_translation_unit
../../gcc-source-trunk/gcc/cp/parser.c:4324
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.
$
----------------------------------
template < int N, typename T >
class A
{
enum alignas (N) E : T;
};
A < 1, char > a;
