| Issue |
149479
|
| Summary |
Clang 13-15 segfault during template instantiation with ill-formed nested type and RTTI operation
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Dong-hui-li
|
### Description
Clang versions 13-15 crash with segmentation fault when compiling C++20 code that:
1. Declares a local class with the same name as an outer scoped enum
2. Attempts to initialize that class with an enum value
3. Uses `typeid` operator on the invalid object
### Steps to Reproduce
1. Save the following code as `crash.cpp`:
```cpp
#include <typeinfo>
struct scoped {
enum class scoped2 { RED };
};
template<auto>
struct S {
void f() {
class scoped2 e = scoped::scoped2::RED;
typeid(e);
}
};
int main() {
S<scoped::scoped2::RED>{}.f();
}
```
2. Compile with affected Clang versions:
```bash
clang++-13 -std=c++20 crash.cpp
clang++-14 -std=c++20 crash.cpp
clang++-15 -std=c++20 crash.cpp
```
### Expected Behavior
Compiler should report type errors without crashing.
### Actual Behavior
Compiler crashes with segmentation fault during template instantiation.
### Affected Versions
- Clang 13.0.1
- Clang 14.0.0
- Clang 15.0.7
### Environment
- OS: Ubuntu 22.04 LTS
- Architecture: x86_64
### Notes
Clang 11 behaves correctly (reports errors without crashing).
### Expected Behavior
Compiler should report type errors without crashing
### Actual Behavior
Compiler crashes with segmentation fault during template instantiation
### Affected Versions
- Clang 13.0.1
- Clang 14.0.0
- Clang 15.0.7
### Additional Info
- Clang 11 behaves correctly (reports errors without crashing)
- Crash occurs in `Sema::SubstStmt` and `Sema::InstantiateFunctionDefinition`
- Stack trace and preprocessed files generated automatically by compiler
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