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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.lang.c
Subject: Re: tcc - first impression. Was: Baby X is bor nagain
Date: Wed, 3 Jul 2024 00:42:58 +0300
Organization: A noiseless patient Spider
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Message-ID: <20240703004258.0000265e@yahoo.com>
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On Tue, 02 Jul 2024 17:12:47 +0100
Ben Bacarisse <ben@bsb.me.uk> wrote:

> Michael S <already5chosen@yahoo.com> writes:
> 
> > On Tue, 02 Jul 2024 16:32:23 +0100
> > Ben Bacarisse <ben@bsb.me.uk> wrote:
> >  
> >> Michael S <already5chosen@yahoo.com> writes:
> >>   
> >> > On Mon, 1 Jul 2024 20:09:24 +0300
> >> > Michael S <already5chosen@yahoo.com> wrote:
> >> >
> >> > As far as I am concerned, the most intriguing feature of tcc is
> >> > "Memory and Bound checks". Unfortunately, I was not able to make
> >> > it work. It keeps telling me "segmentation error" at first
> >> > attempt to dereference argv. Is this feature Linux-only or
> >> > 32-bit only or some other type of "only" ?    
> >> 
> >> The documentation says it should work on x86_64 in Windows.
> >> 
> >> Can you post the code so we can compare.  With this little program
> >> 
> >>   #include <stdio.h>
> >>    
> >>   void f(int *a, int n)
> >>   {
> >>        printf("a[%d] == %d\n", n, a[n]);
> >>   }
> >>    
> >>   int main(int argc, char **argv)
> >>   {
> >>        for (int i = 0; i <= argc; i++)
> >>             if (argv[i])
> >>                  printf("argv[%d] == %s\n", i, argv[i]);
> >>             else printf("argv[%d] is a null pointer\n", i);
> >>        int a[3];
> >>        f(a, 3);
> >>   }
> >> 
> >> I get this output:
> >> 
> >> $ ./a.out 1
> >> argv[0] == ./a.out
> >> argv[1] == 1
> >> argv[2] is a null pointer
> >> 004021b9 : at ???: BCHECK: 0x7ffca6719404 is outside of the region
> >> t.c:5: by f
> >> t.c:15: by main
> >> t.c:5: at f: RUNTIME ERROR: invalid memory access
> >> t.c:15: by main    
> >>   
> >
> > I got plain "Segmentation fault".
> >
> > I it gets me "Segmentation fault" on something as simple as:
> >
> > #include <stdio.h>
> > int main(int argc, char **argv)
> > {
> >   printf("%p\n", argv[0]);
> >   return 0;
> > }  
> 
> Ah.  That looks like a plain "not working" then.  (Presumably you get
> a reasonable-looking pointer without the -b option).  What version of
> tcc?
>

0.9.27