https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123752
Bug ID: 123752
Summary: [reflection] data_member_spec() doesn't accept
default-initialized data_member_options
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: john at drouhard dot dev
Target Milestone: ---
Given this test program:
#include <meta>
class Test {
struct Storage;
consteval {
define_aggregate(^^Storage, {data_member_spec(^^int, {})});
}
Storage storage_;
};
results in the following (gcc compiled from git hash 81950116744 from
2026/01/21)
# g++ -std=c++26 -freflection -o test test.cpp
test.cpp:7:3: error: uncaught exception of type 'std::meta::exception';
'what()': 'neither name nor bit_width specified'
7 | }
| ^
test.cpp:8:11: error: field 'storage_' has incomplete type 'Test::Storage'
8 | Storage storage_;
| ^~~~~~~~
test.cpp:4:10: note: forward declaration of 'struct Test::Storage'
4 | struct Storage;
| ^~~~~~~
