compiler/library behavior differences?

["W. Carlisle" <carliwh at auburn dot edu>]

The following C program produces different results with Sun compiler,
ICC compiler and GCC compiler.  Is it a rounding error due to
temporaries?  Or is it in the printf library?

 The other compilers seem to handle this better.  I get same result
with cygwin and on linux, and believe both to be GCC.  

#include <stdio.h>
#include <math.h>
int main() {
	double d = log(8.0)/log(2.0);
	printf("%d\n", (int) (d));                                      
     //prints 3
                printf("%lf\n",log(8.0)/log(2.0));                     
        //prints 3.000000
	printf("%d\n", (int) ( log(8.0)/log(2.0)));                 
//prints 2
	printf("%d\n", (int) (d=log(8.0)/log(2.0)));             
//prints 2
	printf("%d\n", (int) d);                                        
     //prints 3
   }


Sun and ICC compilers give 3,3.000000,3,3,3

Linux compiler is GCC 3.4.4 20050721 RedHat 3.4.4-2
gcc prog.c -lm