Re: ISO C90 compilation error

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Feb 29, 2024 at 07:03:35AM +0000, Paz Offer wrote:
> Hi,
> 
> I am trying to build my code with QEMU and getting compilation error according to the ISO C90 standard:
> 
>       const size_t buf_size = 31;
>       char buffer[buf_size + 1];
> 
>       error: ISO C90 forbids array ‘buffer’ whose size can’t be evaluated [-Werror=vla]
> 
> I noticed that the code builds with '-std=gnu11', which is newer then
> C90, so this is not clear to me why I get this error.
> Where is the correct place to specify the language version for this?

QEMU has set compiler flags to explicitly /forbid/ use of variable
sized arrays on the stack, as it is a known dangerous language
feature. You must refactor your changes to avoid this by using either
a statically sized array, or allocating on the heap.

With regards,
Daniel
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