Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: do { quit; } else { }
Date: Fri, 11 Apr 2025 20:46:39 +0100
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In-Reply-To: <20250411102119.431@kylheku.com>

On 11/04/2025 18:22, Kaz Kylheku wrote:
> On 2025-04-11, Michael S <already5chosen@yahoo.com> wrote:
>> On Thu, 10 Apr 2025 17:59:15 -0700
>> Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:
>>
>>>
>>> An understanding of what "compatible types" means.
>>
>> Bart didn't say that types are compatible or non-compatible.
>> He said that they are 'compatible enough'. That is not terminology of C
>> Standard, but terminology of his own. And he seems to understand it.
>>
>> In my own translation, 'compatible enough' means that when these structs
>> are accessed then any sane or even semi-sane compiler will generate code
>> that will have the same effect as in case of access through structures
>> with literally identical declarations.
> 
> so struct { long x; } and struct { int x; } are compatible enough,
> in situations that are portable enough.


What about struct {long x;} and struct {int64_t x;}?

Whether they are compatible seems to be depend on platform.

Or rather, whether or not int64_t happens to defined on top of 'long' or 
'long long'.