https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127493
Bug ID: 127493
Summary: reflection: source_location_of does not like class
members
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ivan.lazaric.gcc at gmail dot com
Target Milestone: ---
Flags: "-std=c++26 -O3 -freflection"
```cpp
#include <meta>
struct S {
void fn(int) {}
};
consteval {
auto refl = ^^S::fn;
auto loc = source_location_of(refl);
__builtin_constexpr_diag(0, "", loc.file_name());
__builtin_constexpr_diag(0, "", std::to_string(loc.line()));
}
```
Prints:
```
<source>:10:29: note: constexpr message:
<source>:11:29: note: constexpr message: 0
```
https://godbolt.org/z/j1h6EsceW
```cpp
#include <meta>
struct S {
using X = int;
};
consteval {
auto refl = ^^S::X;
auto loc = source_location_of(refl);
__builtin_constexpr_diag(0, "", loc.file_name());
__builtin_constexpr_diag(0, "", std::to_string(loc.line()));
}
```
This errors:
```
<source>:12:1: in 'constexpr' expansion of '<lambda()> static()'
12 | }
| ^
<source>:10:29: error: request for member 'size' in '&"<source>"[0]', which is
of non-class type 'const char*'
10 | __builtin_constexpr_diag(0, "", loc.file_name());
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
<source>:10:29: error: constexpr string must be a string literal or object with
'size' and 'data' members
```
https://godbolt.org/z/63o6GY4e7
