| Issue |
145218
|
| Summary |
No warning about dangerous pointer casts
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
wo4mei3
|
Both Clang and GCC do not issue any warnings about the following code, even with the -Wall option.
For Clang, I used Clang-16.
The executable produced by GCC caused a segmentation fault, while Clang's always prints 1.
I propose that casting a pointer from a smaller pointee type to larger one, which can easily lead to segmentation faults should produce a compiler warning.
```
#include <stdio.h>
struct X {
int x;
};
struct Y {
int x;
int y;
};
int main(void) {
struct X x = {0};
struct Y* y = (struct Y*) &x;
y->y = 1;
printf("%d", y->y);
return 0;
}
```
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
