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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Are there any conformant C compilers?
Date: Fri, 02 Sep 2022 20:42:07 -0700
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Xref: csiph.com comp.lang.c:167451

antispam@math.uni.wroc.pl writes:
[...]
> #include <stdio.h>
> int main(void) {
>     register const int abc = 123;
>     *(int*)&abc = 999;
>     printf("abc = %d\n", abc);
>     return 0;
> }
>
> gcc still only produces a warning, but you get warning without
> any extra options.

That's odd, I get a fatal error by default with gcc 8.3.0 and 11.2.0.

c.c: In function ‘main’:
c.c:4:5: error: address of register variable ‘abc’ requested
    4 |     *(int*)&abc = 999;
      |     ^

[...]

-- 
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 */