| Issue |
141409
|
| Summary |
[Clang] C2Y `_Countof` weird sub-array count with multidimensional VLA
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
fuhsnn
|
This snippet:
```
#include <stdio.h>
int main(int i, char**) {
int arr[11][++i][33][++i];
printf("%lu\t", _Countof arr);
printf("%lu\t", _Countof *arr);
printf("%lu\t", _Countof **arr);
printf("%lu\t", _Countof ***arr);
printf("\n");
printf("%lu\t", sizeof arr / sizeof *arr);
printf("%lu\t", sizeof *arr / sizeof **arr);
printf("%lu\t", sizeof **arr / sizeof ***arr);
printf("%lu\t", sizeof ***arr / sizeof ****arr);
printf("\n\t^ here\n");
}
```
prints the following with current Godbolt trunk and clang-21 in LLVM Debian nightly:
```
11 198 33 3
11 2 33 3
^ here
```
The second output looks funny, if I understand _Countof correctly it should be `2` instead of `2*33*3`.
Godbolt: https://godbolt.org/z/o1c6bWosM
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