| Issue |
135142
|
| Summary |
Clang accepts illegal flexible array member inside struct used in std::vector
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
GINN-Imp
|
https://godbolt.org/z/brW45GE3h
Clang -std=c++17 -pedantic accepts the following code:
```cpp
#include <vector>
struct Bad {
struct {} i[];
};
int main() {
std::vector<Bad> v;
}
```
Expected (GCC):
```
In file included from /opt/compiler-explorer/gcc-trunk-20250409/include/c++/15.0.1/vector:68,
from <source>:1:
/opt/compiler-explorer/gcc-trunk-20250409/include/c++/15.0.1/bits/stl_vector.h: In instantiation of 'std::_Vector_base<_Tp, _Alloc>::~_Vector_base() [with _Tp = Bad; _Alloc = std::allocator<Bad>]':
/opt/compiler-explorer/gcc-trunk-20250409/include/c++/15.0.1/bits/stl_vector.h:561:7: required from here
561 | vector() = default;
| ^~~~~~
/opt/compiler-explorer/gcc-trunk-20250409/include/c++/15.0.1/bits/stl_vector.h:376:49: error: arithmetic on pointer to an empty aggregate
376 | _M_impl._M_end_of_storage - _M_impl._M_start);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
Compiler returned: 1
```
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