https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79385
Bug ID: 79385
Summary: ICE on (likely) valid C++11 code on x86_64-linux-gnu:
Product: gcc
Version: unknown
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 code also crashes at least 4.7.x and later, as well as clang 3.5.x and
later.
Interestingly, if we move
enum A < int >::E e;
immediately before
static_assert (A < int >().f () == 0, "error");
the code compiles fine.
$ 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/7.0.1/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 7.0.1 20170205 (experimental) [trunk revision 245187] (GCC)
$
$ g++-trunk -c -std=c++11 small.cpp
small.cpp: In instantiation of ‘constexpr int A<T>::f() const [with T = int]’:
small.cpp:12:30: required from here
small.cpp:10:68: internal compiler error: in tsubst_copy, at cp/pt.c:14451
template < typename T > constexpr int A < T >::f () const { return R; }
^
0x6faeff tsubst_copy
../../gcc-source-trunk/gcc/cp/pt.c:14451
0x6fdd20 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc-source-trunk/gcc/cp/pt.c:17856
0x6f1337 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc-source-trunk/gcc/cp/pt.c:16403
0x6f2b3c tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc-source-trunk/gcc/cp/pt.c:15666
0x6f1b33 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc-source-trunk/gcc/cp/pt.c:15880
0x6eef94 instantiate_decl(tree_node*, bool, bool)
../../gcc-source-trunk/gcc/cp/pt.c:22819
0x8d1157 cxx_eval_call_expression
../../gcc-source-trunk/gcc/cp/constexpr.c:1490
0x8d2ee3 cxx_eval_constant_expression
../../gcc-source-trunk/gcc/cp/constexpr.c:3957
0x8daa59 cxx_eval_outermost_constant_expr
../../gcc-source-trunk/gcc/cp/constexpr.c:4591
0x8ddf05 maybe_constant_value(tree_node*, tree_node*)
../../gcc-source-trunk/gcc/cp/constexpr.c:4805
0x8b8cf1 cp_fully_fold(tree_node*)
../../gcc-source-trunk/gcc/cp/cp-gimplify.c:1963
0x7f33da cp_build_binary_op(unsigned int, tree_code, tree_node*, tree_node*,
int)
../../gcc-source-trunk/gcc/cp/typeck.c:5237
0x6911ba build_new_op_1
../../gcc-source-trunk/gcc/cp/call.c:5976
0x6922be build_new_op(unsigned int, tree_code, int, tree_node*, tree_node*,
tree_node*, tree_node**, int)
../../gcc-source-trunk/gcc/cp/call.c:6021
0x7e3692 build_x_binary_op(unsigned int, tree_code, tree_node*, tree_code,
tree_node*, tree_code, tree_node**, int)
../../gcc-source-trunk/gcc/cp/typeck.c:3924
0x7bb9d6 cp_parser_binary_expression
../../gcc-source-trunk/gcc/cp/parser.c:9033
0x7bc130 cp_parser_assignment_expression
../../gcc-source-trunk/gcc/cp/parser.c:9165
0x7bc56a cp_parser_constant_expression
../../gcc-source-trunk/gcc/cp/parser.c:9433
0x7bc64f cp_parser_static_assert
../../gcc-source-trunk/gcc/cp/parser.c:13579
0x7cf919 cp_parser_block_declaration
../../gcc-source-trunk/gcc/cp/parser.c:12590
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 < typename T > struct A
{
enum E : int;
constexpr int f () const;
};
enum A < int >::E e;
template < typename T > enum A < T >::E : int { R };
template < typename T > constexpr int A < T >::f () const { return R; }
static_assert (A < int >().f () == 0, "error");
