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Re: [PATCH 1/4] localename: -Wtautological-pointer-compare

From: Paul Eggert
Subject: Re: [PATCH 1/4] localename: -Wtautological-pointer-compare
Date: Sun, 15 Jan 2023 16:15:04 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2

On 2023-01-15 14:03, Bruno Haible wrote:

My confusion arose partly because I am accustomed to languages where the
distinction between null and non-null pointers is checked statically ...

Oh, now I understand. May I guess the language: Haskell, OCaml, TypeScript,

These days OCaml and maybe Rust, though the language that first comes to my mind is one I designed in the 1970s and never got off the ground: B Pascal.

Unfortunately, this is an excellent example for a portability problem:
The division yields a SIGFPE on x86, x86_64, alpha, m68k, and s390/s390x
CPU, but not on other architectures.

I suppose I should have written that my assumption was that the code is executed in a context where the divisor must be positive. (This is pretty common when calculating indexes from sizes.)

In other contexts the extra checking may be necessary, or at least helpful.

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