RealView Compilation Tools Compiler Reference Guide - ARM ...

Language Extensions
Mode
Supported in GNU mode only for C90 and C99 only.
3.7.12 Pointer arithmetic
You can perform arithmetic on void pointers and function pointers.
The size of a void type or a function type is defined to be 1.
Mode
Supported in GNU mode for C90 and C99 only.
Errors
The compiler generates a warning if it detects arithmetic on void pointers or function
pointers.
Example
int ptr_arith_0(void)
{
void * pointer;
return sizeof *pointer;
}
int ptr_arith_1(void)
{
static int diff;
diff = ptr_arith_0 - ptr_arith_1;
}
return sizeof ptr_arith_0;
3.7.13 Statement expressions
Statement expressions enable you to place whole sections of code, including
declarations, within braces ({ }) .
The result of a statement expression is the final item in the statement list.
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