https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118128
Bug ID: 118128
Summary: Internal Compiler Error with using enum and Templated
Class
Product: gcc
Version: 11.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kilian.tr...@rohde-schwarz.com
Target Milestone: ---
Host: Ubuntu 22.04.5
Created attachment 59918
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59918&action=edit
preprocessed source code
When compiling the following C++ code that utilizes using enum within a
templated class, GCC produces an internal compiler error. The issue appears to
be related to the combination of using enum and the templated class.
Code Example:
class b {
public:
enum class a { c };
using enum a;
b(a) {}
};
template<typename>
class d {
b a = b::c;
};
int main() {
d<int> d;
}
Steps to reproduce:
1. Save the above code in a file named error.cpp.
2. Compile the code using the command:
g++ error.cpp -std=c++20
Additional Information:
* The code compiles successfully when directly accessing the enum value (e.g.,
b::a::c) or when the template of class d is removed.
* This issue has been tested on GCC versions 11.4.0 and 11.5.0, and it appears
to be present in all versions prior to 12.3.
Output of g++ -v -save-temps error.cpp -std=c++20 (.ii file is attached):
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/11.5.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.5.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++20' '-shared-libgcc'
'-mtune=generic' '-march=x86-64' '-dumpdir' 'a-'
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/11.5.0/cc1plus -E -quiet -v
-imultiarch x86_64-linux-gnu -D_GNU_SOURCE error.cpp -mtune=generic
-march=x86-64 -std=c++20 -fpch-preprocess -o a-error.ii
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.5.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.5.0/../../../../include/c++/11.5.0
/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.5.0/../../../../include/c++/11.5.0/x86_64-pc-linux-gnu
/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.5.0/../../../../include/c++/11.5.0/backward
/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.5.0/include
/usr/local/include
/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.5.0/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++20' '-shared-libgcc'
'-mtune=generic' '-march=x86-64' '-dumpdir' 'a-'
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/11.5.0/cc1plus -fpreprocessed
a-error.ii -quiet -dumpdir a- -dumpbase error.cpp -dumpbase-ext .cpp
-mtune=generic -march=x86-64 -std=c++20 -version -o a-error.s
GNU C++20 (GCC) version 11.5.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 11.5.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++20 (GCC) version 11.5.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 11.5.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 9142fb5436a559c637d51027d8c27ce4
error.cpp: In instantiation of ‘constexpr d<int>::d()’:
error.cpp:14:10: required from here
error.cpp:10:14: internal compiler error: in tsubst_copy, at cp/pt.c:16892
10 | b a = b::c;
| ~~~^
0x6269ff tsubst_copy
../.././gcc/cp/pt.c:16892
0x7c112a tsubst_qualified_id
../.././gcc/cp/pt.c:16618
0x7c2e26 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../.././gcc/cp/pt.c:20133
0x70ca41 get_nsdmi(tree_node*, bool, int)
../.././gcc/cp/init.c:614
0x726d18 walk_field_subobs
../.././gcc/cp/method.c:2279
0x72746b synthesized_method_walk
../.././gcc/cp/method.c:2637
0x7279dd get_defaulted_eh_spec(tree_node*, int)
../.././gcc/cp/method.c:2679
0x7c4fd0 maybe_instantiate_noexcept(tree_node*, int)
../.././gcc/cp/pt.c:25869
0x7c4ef9 maybe_instantiate_noexcept(tree_node*, int)
../.././gcc/cp/pt.c:25859
0x6f3da2 mark_used(tree_node*, int)
../.././gcc/cp/decl2.c:5621
0x67adde build_over_call
../.././gcc/cp/call.c:9531
0x679587 build_new_method_call_1
../.././gcc/cp/call.c:10821
0x67cbf7 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
../.././gcc/cp/call.c:10897
0x67cbf7 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
../.././gcc/cp/call.c:10297
0x707793 expand_default_init
../.././gcc/cp/init.c:1995
0x707793 expand_aggr_init_1
../.././gcc/cp/init.c:2110
0x7096b5 build_aggr_init(tree_node*, tree_node*, int, int)
../.././gcc/cp/init.c:1844
0x6d52bd build_aggr_init_full_exprs
../.././gcc/cp/decl.c:6990
0x6d52bd check_initializer
../.././gcc/cp/decl.c:7155
0x6e9478 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
../.././gcc/cp/decl.c:8164
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.
