In C, if the prototype for a function is not provided, the compiler
assumes that the function takes an integer and returns an integer. As
a result malloc would be treated as returning an integer instead of a
pointer.
On 32 -bit systems, both integer and pointer are 32-bits, hence the
program works fine.
(the model is called ILP-32 : Integer, Long, Pointer are 32-bits)
But on Linux/IA-64 with gcc, the...