Declaring fixed-size integer typedef in Standard C

Question

Is there a reliable way to declare typedefs for integer types of fixed 8,16,32, and 64 bit length in ISO Standard C?

When I say ISO Standard C, I mean that strictly:

Answer 1

A danger with such approaches when using modern compilers is that it has become fashionable for compilers to assume that a pointer of one integer type will not be used to access values of another, even when both types have the same size and representation. If two types have the same size and representation, and two parts of the same program each choose one of them, applying link-time optimizations to programs that share pointers to such data could result in improper behavior. For some implementations on many systems, there will be at least one size of integer for which it will be impossible to declare a pointer which can be safely used to access all integer values of that size; e.g. on systems where both long and long long are 64 bits, there will be no way to declare a pointer which can be used reliably to access data of either type interchangeably.