https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119512
Bug ID: 119512
Summary: -Wuninitialized does not diagnose use of uninitialized
member in constructor initialization list
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: peter0x44 at disroot dot org
Target Milestone: ---
For the following testcase, that I reduced out of a beginner's snake game code:
https://gcc.godbolt.org/z/9PaE9nnG4
```
namespace std {
template <typename> class deque {};
}
class Food {
public:
Food(std::deque<int>);
};
class Snake {
public:
std::deque<int> body;
};
class Game {
Game();
Food food;
Snake snake;
};
Game::Game() : food(snake.body) {}
```
clang emitted a warning about the uninitialized variable use, due to the order
of the class members:
<source>:21:21: warning: field 'snake' is uninitialized when used here
[-Wuninitialized]
21 | Game::Game() : food(snake.body) {}
| ^
but gcc does not emit any warning
