Re: [Tinycc-devel] More fun with comparison between pointer and integer...

[Dave Dodge]

On Wed, Sep 05, 2007 at 12:11:01AM -0500, Rob Landley wrote:
> So in my toybox project (which I'm trying to build with tcc), I'm pulling a 
> dirty trick to do dead code elimination on gcc.  Basically, I have macros 
> that boil down to:
> 
> static const int blah = ptr || ptr || ptr || ptr || 0;
> 
> with the various ptr entries being either a string constant or NULL.
...
> I fixed the "ptr || ptr" bit not working (check hg), and I just made it stop 
> warning me about "comparison between pointer and int" for && and ||, but now 
> it's saying "initializer element not constant".

Well looking at 6.6, I'm having a hard time figuring out how to fit
the above into one of the described forms of "constant expression".
It's the use of pointers at all that causes the problem; most of the
ways of defining such expressions seem to be constrained to using only
arithmetic types.

I suspect your expression is falling into the gray area of "An
implementation may accept other forms of constant expressions."

                                                  -Dave Dodge