https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70332
Bug ID: 70332
Summary: ICE on x86_64-linux-gnu in tsubst_copy, at
cp/pt.c:13887
Product: gcc
Version: 6.0
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 code causes an ICE when compiled with the current GCC trunk (and
5.x) on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 4.9.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/6.0.0/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 6.0.0 20160320 (experimental) [trunk revision 234355] (GCC)
$
$ g++-trunk -c -std=c++14 small.cpp
small.cpp:4:9: internal compiler error: in tsubst_copy, at cp/pt.c:13887
T m = m;
^
0x686f54 tsubst_copy
../../gcc-source-trunk/gcc/cp/pt.c:13887
0x6885eb tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc-source-trunk/gcc/cp/pt.c:16987
0x689a7d tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc-source-trunk/gcc/cp/pt.c:16030
0x68998e tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc-source-trunk/gcc/cp/pt.c:16007
0x68a178 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc-source-trunk/gcc/cp/pt.c:16768
0x790ed4 get_nsdmi(tree_node*, bool)
../../gcc-source-trunk/gcc/cp/init.c:568
0x6cc7f0 process_init_constructor_record
../../gcc-source-trunk/gcc/cp/typeck2.c:1415
0x6cc7f0 process_init_constructor
../../gcc-source-trunk/gcc/cp/typeck2.c:1594
0x6cc7f0 digest_init_r
../../gcc-source-trunk/gcc/cp/typeck2.c:1123
0x6ced8a digest_init_flags
../../gcc-source-trunk/gcc/cp/typeck2.c:1168
0x6ced8a store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
../../gcc-source-trunk/gcc/cp/typeck2.c:802
0x62fa04 check_initializer
../../gcc-source-trunk/gcc/cp/decl.c:6155
0x6595fc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
../../gcc-source-trunk/gcc/cp/decl.c:6783
0x75279f cp_parser_init_declarator
../../gcc-source-trunk/gcc/cp/parser.c:18658
0x752f50 cp_parser_simple_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12379
0x753261 cp_parser_block_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12248
0x75bdd0 cp_parser_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12145
0x75a894 cp_parser_declaration_seq_opt
../../gcc-source-trunk/gcc/cp/parser.c:12024
0x75abc8 cp_parser_translation_unit
../../gcc-source-trunk/gcc/cp/parser.c:4323
0x75abc8 c_parse_file()
../../gcc-source-trunk/gcc/cp/parser.c:37408
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.
$
$ g++-4.9 -c -std=c++14 small.cpp
$
$ clang++-trunk -c -std=c++14 small.cpp
$
-------------------------
template <class T>
struct C
{
T m = m;
};
C <int> c {};
