| Issue |
177608
|
| Summary |
Crash for OpenMP loop referencing auto-typed VMT
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tstanisl
|
The compilation crashes for the following C23 code.
```
void foo(int N, int (*arr_)[N][N]) {
auto arr = arr_;
#pragma omp parallel for
for (int n = 0; n < N; ++n)
(*arr)[n][n] = 1;
}
```
It looks that there is some issue with OpenMP sections capturing multidimensional VLA-typed objects which type was auto-deduced.
See [godbolt](https://godbolt.org/z/e9Mf6M4MM).
The similar issue is also observed for
```
__auto_type arr = arr_;
```
or
```
auto arr = (int(*)[N][N])arr_;
```
However, there is *no crash* if:
1. The `arr_` is de-referenced directly `(*arr_)[n][n]`
2. No type-deduction is used
```
int (*arr)[N][N] = arr_;
```
3. A pointer to 1d VLA-typed array is used
```
void bar(int N, int (*arr1d_)[N]) {
auto arr1d = arr1d_; /* OK */
#pragma omp parallel for
for (int n = 0; n < N; ++n)
(*arr1d)[n] = 1;
}
```
Take a look on [godbolt](https://godbolt.org/z/Pa37Ex9n1) to easily navigate between mentioned cases.
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