| Issue |
124638
|
| Summary |
clang-cl: Incomplete/missing debug info for classes marked with `novtable`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Nerixyz
|
Classes that are marked with `__declspec(novtable)` won't have full debug info generated (only a forward declaration).
### Reproduction
**Input**:
```cpp
// novtable.cpp
class __declspec(novtable) _Ref_count_base {
virtual void _Destroy() noexcept {};
int _Uses = 1;
};
int main() {
_Ref_count_base base;
return 0;
}
```
1. Compile with `clang-cl /Zi novtable.cpp`
2. Check the generated debug info:
```console
> llvm-pdbutil pretty -classes -include-types=_Ref_count novtable.pdb
[...]
Classes: (Showing 915 items)
class _Ref_count_base [sizeof = 0] {}
```
3. Remove the `__declspec(novtable)`
4. Remove `novtable.pdb`
5. Compile with `clang-cl /Zi novtable.cpp`
6. Check the generated debug info:
```console
> llvm-pdbutil pretty -classes -include-types=_Ref_count novtable.pdb
[...]
Classes: (Showing 915 items)
class _Ref_count_base [sizeof = 16] {
func [0x000071c0+ 0 - 0x000071c7- 7 | sizeof= 7] (FPO) virtual void __cdecl _Ref_count_base::_Destroy()
vfptr +0x00 [sizeof=8]
data +0x08 [sizeof=4] int _Uses
<padding> (4 bytes)
}
[...]
```
---
I'd like to fix this myself.
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