# Re: Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1

- From: John Paul Adrian Glaubitz \<glaubitz@physik.fu-berlin.de\>
- Date: 2023-01-17 22:06:25 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2023/01/2069968
- Thread: https://ratatoskr.run/amd-gfx/2022/12/2049012/t.md

```text
Hi!

On 1/17/23 21:05, Geert Uytterhoeven wrote:
>> Isn't this supposed to be caught by this check:
>>
>>          a, __same_type(a, NULL)
>>
>> ?
>
> Yeah, but gcc thinks it is smarter than us...
> Probably it drops the test, assuming UB cannot happen.

Hmm, sounds like a GGC bug to me then. Not sure how to fix this then.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
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```