https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93297
John McFarlane <john at mcfarlane dot name> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |john at mcfarlane dot name
--- Comment #7 from John McFarlane <john at mcfarlane dot name> ---
I'm seeing what appears to be the same ICE at head (SHA b003c4b1). This is
reproducible in CE (https://godbolt.org/z/MG1sax). Output with `-v` below.
Source file is:
template <class> class a;
template <2> using b a<int>;
static_assert(b{ }
=========================
john@carbon:~/ws/c++20/cnl/build$ g++ -v reduceme.cpp
Using built-in specs.
COLLECT_GCC=/usr/bin/g++
COLLECT_LTO_WRAPPER=/home/john/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --disable-multilib
--prefix=/home/john/gcc-head/ --enable-languages=c,c++,lto
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201019 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
'-dumpdir' 'a-'
/home/john/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/cc1plus -quiet -v
-imultiarch x86_64-linux-gnu -D_GNU_SOURCE reduceme.cpp -quiet -dumpdir a-
-dumpbase reduceme.cpp -dumpbase-ext .cpp -mtune=generic -march=x86-64 -version
-o /tmp/ccBQ8tty.s
GNU C++17 (GCC) version 11.0.0 20201019 (experimental) (x86_64-pc-linux-gnu)
compiled by GNU C version 11.0.0 20201019 (experimental), GMP version
6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version none
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring non-existent directory "/usr/local/include/x86_64-linux-gnu"
ignoring non-existent directory
"/home/john/gcc-head/lib/gcc/x86_64-pc-linux-gnu/11.0.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/john/gcc-head/lib/gcc/x86_64-pc-linux-gnu/11.0.0/../../../../include/c++/11.0.0
/home/john/gcc-head/lib/gcc/x86_64-pc-linux-gnu/11.0.0/../../../../include/c++/11.0.0/x86_64-pc-linux-gnu
/home/john/gcc-head/lib/gcc/x86_64-pc-linux-gnu/11.0.0/../../../../include/c++/11.0.0/backward
/home/john/gcc-head/lib/gcc/x86_64-pc-linux-gnu/11.0.0/include
/usr/local/include
/home/john/gcc-head/include
/home/john/gcc-head/lib/gcc/x86_64-pc-linux-gnu/11.0.0/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C++17 (GCC) version 11.0.0 20201019 (experimental) (x86_64-pc-linux-gnu)
compiled by GNU C version 11.0.0 20201019 (experimental), GMP version
6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version none
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 898bda479bba6f05660e15f0cb7d4838
reduceme.cpp:2:11: error: expected identifier before numeric constant
2 | template <2> using b a<int>;
| ^
reduceme.cpp:2:11: error: expected ‘>’ before numeric constant
reduceme.cpp:2:22: error: expected ‘=’ before ‘a’
2 | template <2> using b a<int>;
| ^
reduceme.cpp:3:52: warning: alias template deduction only available with
‘-std=c++20’ or ‘-std=gnu++20’
3 | static_assert(b{ }
| ^
reduceme.cpp:3:52: internal compiler error: in set_constraints, at
cp/constraint.cc:1192
0x63dc05 set_constraints(tree_node*, tree_node*)
../../gcc/gcc/cp/constraint.cc:1192
0xa37768 alias_ctad_tweaks
../../gcc/gcc/cp/pt.c:28819
0xa37768 deduction_guides_for
../../gcc/gcc/cp/pt.c:28934
0xa37a98 do_class_deduction
../../gcc/gcc/cp/pt.c:29042
0xa37a98 do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
../../gcc/gcc/cp/pt.c:29211
0xa8b289 finish_compound_literal(tree_node*, tree_node*, int, fcl_t)
../../gcc/gcc/cp/semantics.c:2934
0x9e7f7a cp_parser_functional_cast
../../gcc/gcc/cp/parser.c:29749
0xa005d7 cp_parser_postfix_expression
../../gcc/gcc/cp/parser.c:7251
0x9e229a cp_parser_binary_expression
../../gcc/gcc/cp/parser.c:9648
0x9e402e cp_parser_assignment_expression
../../gcc/gcc/cp/parser.c:9953
0x9e2bad cp_parser_constant_expression
../../gcc/gcc/cp/parser.c:10247
0x9e2f11 cp_parser_static_assert
../../gcc/gcc/cp/parser.c:14829
0xa1bfe6 cp_parser_declaration
../../gcc/gcc/cp/parser.c:13575
0xa1c63b cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4793
0xa1c63b c_parse_file()
../../gcc/gcc/cp/parser.c:44170
0xb3948d c_common_parse_file()
../../gcc/gcc/c-family/c-opts.c:1188
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
=========================
