Re: [Tinycc-devel] arraystring, a simple C program which doesn't compile

[Michael Matz]

Hello,

On Wed, 3 Jun 2020, Michael Matz wrote:

> >  int main(void)
> >  {
> >      char a[2] = { abc[0], 0 };
> >      puts(a);
> >      return 0;
> >  }
> >
> >  Output:
> >  arraystring.c:6: warning: initializer-string for array is too long
> >  arraystring.c:6: error: '}' expected (got "[")
> >
> >  Interestingly this program works when a parenthesis is put around abc[0]:
> >  char a[2] = { (abc[0]), 0 };
> >  Alternatively, it also works if the parenthesis is around the defined
> >  string
> >  instead:
> >  #define abc ("abc")
> >  which can also be done at usage level:
> >  char a[2] = { (abc)[0], 0 };
> >
> >  so maybe it's an issue with the parser?
>
> Yes it is, specifically the parser for initializers.  It tries to 
> special-case string initialization to not use the general expression parser, 
> and that bites us here.  (The reason for that is to not commit the string to 
> memory too early when it's used to initialize some static data)
> We really need to go through the normal expression parser for this case 
> (which is why it works when adding parentheses around the string token), but 
> that needs some work to not break other cases.

Fixed in mob now.


Ciao,
Michael.