kou opened a new pull request, #38004:
URL: https://github.com/apache/arrow/pull/38004
### Rationale for this change
It's caused by `backtrace()` and `backtrace_symbols_fd()` signatures are
different on Linux and FreeBSD (`int` vs `size_t`).
Linux:
```c
extern int backtrace (void **__array, int __size) __nonnull ((1));
extern void backtrace_symbols_fd (void *const *__array, int __size, int __fd)
__THROW __nonnull ((1));
```
FreeBSD:
```c
size_t backtrace(void **, size_t);
int backtrace_symbols_fd(void *const *, size_t, int);
```
### What changes are included in this PR?
Use `auto` to ignore the difference.
### Are these changes tested?
Yes on FreeBSD 12.
### Are there any user-facing changes?
No.
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