Re: [PATCH v2] Hurd: remove VLA usage.

[Simon Marchi <simark@simark.ca>]

On 2024-12-19 00:28, Flavio Cruz wrote:
> Compilation will fail with -Werror=vla, which seems to be the default.
> 
> Note that we don't need to allocate num_threads + 1 since the matching
> algorithm works only on the num_threads as returned by task_threads.

I don't fully understand the algorithm, but I see that `matched` only
gets indexed using `i`, and `i` is always less than `num_threads`, so
this seems fine to me.

> ---
>  gdb/gnu-nat.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
> index a8a4da1c..be6fa879 100644
> --- a/gdb/gnu-nat.c
> +++ b/gdb/gnu-nat.c
> @@ -1016,15 +1016,13 @@ gnu_nat_target::inf_validate_procs (struct inf *inf)
>    {
>      /* Make things normally linear.  */
>      mach_msg_type_number_t search_start = 0;
> -    /* Which thread in PROCS corresponds to each task thread, & the task.  */
> -    struct proc *matched[num_threads + 1];
> +    /* Which thread in PROCS corresponds to each task thread.  */
> +    std::vector<struct proc *> matched (num_threads, nullptr);

It's not necessary to specify nullptr here, because the pointers will be
default initialized, which means nullptr for pointers.

LGTM with that fixed.

Approved-By: Simon Marchi <simon.marchi@efficios.com>

Do you have push access?

Simon