Strange warning text

[Christoph Rabel]

Hi!

Compiling the following program with -Wall

struct MyType{};

int main()
{
  int size = 0;
  int temp1[size];
}

I get the following warning:

x12.cpp: In function `int main()':
x12.cpp:6: warning: unused variable `int temp1[((size - 1) + 1)]'

I was rather surprised by "((size - 1) + 1)" part.

While this is a rather unimportant issue I would be interested to know 
why 1 is subtracted and then added again. I see no sense in this and 
really would like to get an explanation for this warning text.

Thx very much!

Christoph