Small Device C Compiler suite

Bugs item #904237, was opened at 2004-02-25 14:59
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Category: msc51(8051) target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Josef Pavlik (jetset)
Assigned to: Nobody/Anonymous (nobody)
Summary: pointer cast problem and sizeof(void) should'nt be 0

Initial Comment:
hello
I found, that is impossible to cast the type of pointer when I want to increment it.
When I try something like this:
void *voidptr;
((unsigned int *)voidptr)++;
I got the error: 'lvalue' required for '++' operation.
If I omit the parenthesis, no increment is done because no type casting is done (because the priority of operands) and the size of void is 0. 

If I try to add the sizeof of unsigned int:
ptr+=sizeof(unsigned int);
nothing happens, because in the sdcc the size of void is 0. 
I think that this is not right. In this case is impossible to modify an void pointer. The gcc thinks that size of void is 1, so voidptr+=sizeof(something) makes sense. 

I thing, that sizeof anything may not be 0. sizeof(void), increment void* etc may produce an error or something, but does not silently ignore it. My opinion is that the right way is make it 1, like makes gcc.


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