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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: variable addresses on the stack
Date: Wed, 21 Sep 2022 15:30:11 -0700
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Thiago Adams <thiago.adams@gmail.com> writes:
[...]
> C99 added Flexible array members
>
> struct s {
>     int n;
>     double d[]; 
> };
>
> Does anyone have suggestion how to write this in C89?
>
> struct s {
>     int n;
>     double d[1]; //maybe?
> };
>
> The sizeof a struct with flexible array members is not not clear.. 

The (questionably legal) predecessor to flexible array members was
known as the "struct hack".  See question 2.6 of the comp.lang.c FAQ.

https://www.c-faq.com/

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips
void Void(void) { Void(); } /* The recursive call of the void */