Interfacing with C in 2.066.1

[John Colvin via Digitalmars-d]

On Saturday, 8 November 2014 at 10:03:51 UTC, Jason den Dulk 
wrote:
> When upgrading my compiler from 2.065 to 2.066.1 I have 
> encountered problems with some of my extern(C) code.
>
> My declarations (in a .di file) are wrapped in an extern(C) 
> declaration. The code compiled fine in 2.065. In 2.066.1 it 
> first complained about functions returning "const char *" 
> ("function without this cannot be const").

const char* foo() {}

is a function that takes a const 'this' reference and returns 
char*
You want
const(char)* foo() {}
or
const(char*) foo() {}

If you do want a const 'this' then you should write:

char* foo() const {}