whisperity wrote:

@nicovank 
> Add check and alias entries to 
> [clang-tools-extra/docs/clang-tidy/checks/list.rst](https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/docs/clang-tidy/checks/list.rst).
> 
> Check name: this is not only sizeof. Maybe 
> `bugprone-suspicious-pointer-scaling-arithmetic`? Others may have other ideas.

The new check will be dropped and instead the functionality is going to be 
integrated into **ˋbugprone-sizeof-expressionˋ**, which already checks a lot 
more other cases and then some, related to pointer arithmetics as well.

The check's name would have been fine as-is now (and making it part of 
_ˋbugprone-sizeof-expressionˋ_ will be fine as well), because the vast majority 
of cases will have ˋsizeofˋ as the issue, and both ˋalignof()ˋ and ˋoffsetof()ˋ 
essentially scaled **with** ˋsizeofˋ internally, **AND** lets the user commit 
to the same bogus pattern by doing another scaling with the ˋ+ˋ/ˋ-ˋ operator.

@nicovank
> The two examples in the check documentation would not be matched with the 
> current version of this check as they mutiply the `sizeof` expression with a 
> constant before addition. I feel like this is also a common pattern. Can this 
> check also catch those?

Yes, I have already added some deliberately failing tests for these last night, 
and I am engineering the appropriate matchers for this.

https://github.com/llvm/llvm-project/pull/106061
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