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From: Thiago Adams <thiago.adams@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: question about linker
Date: Tue, 26 Nov 2024 16:11:45 -0300
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On 26/11/2024 15:35, Thiago Adams wrote:
> 
> (I think I know the answer but I would like to learn more.)
> 
> I am using C89 as "compiler backend intermediate language".
> 
> I want a very simple output that could facilitate the construction of a 
> simple C89 compiler focused on code generation.

Another question is.. does the compiler cares about function type when 
calling a function or this is just an information to avoid programmers 
mistakes?

Consider this code:

int main() {
     strcmp("a", "b");
}

It compiles in -std=c89

Now changing to -std=c99 -std=c11 it gives:

error: implicit declaration of function 'strcmp'


Then adding:

int strcmp();

int main() {
     strcmp("a", "b");
}

it works in C99 / C11

I think in C23 empty parameter list means no args, while in the previous 
versions (void) means no args.

Considering that in previous versions of C we could call a function 
without its signature I think the compiler only needs the caller side. 
(of course I am not considering programmer mistakes)

So, I think one extra simplification for small compilers is to ignore 
function parameters.