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From: Thiago Adams <thiago.adams@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: C89 "bug"
Date: Fri, 13 Dec 2024 12:41:04 -0300
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 <vjhcle$3den0$2@dont-email.me> <20241213065614.739@kylheku.com>
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Em 12/13/2024 12:01 PM, Kaz Kylheku escreveu:
> On 2024-12-13, Thiago Adams <thiago.adams@gmail.com> wrote:
>> unfortunately, this solution does not work if we have two objects.
>>
>> union U {
>>          double d;
>>          int i;
>>    };
>>
>> union U u1 = { .d=2.2 };
>> union U u2 = { .i=1   };
> 
> Idea: have several declarations of the union in different translation
> units.
> 
> /* translation unit for u1 */
> union U {
>    double d;
>    int i;
> };
> extern union U u1 = { 2.2 };
> 
> /* translation unit for u2 */
> union U {
>    int i;
>    double d;
> };
> extern union U u2 = { 1 };
> 

another solution could be call a function that initializes before main.

extern union U u1;

void before_main()
{
   u1.d = 1.2;
}