When using glibc-2.12, the following program prints "0" (i.e. successful iconv_open) when compiled with dynamic linking, but "1" (i.e. unsuccessful iconv_open) when compiled with static linking:

#include <iconv.h>
#include <stdio.h>
#include <errno.h>
int main () {
iconv_t x;
x = iconv_open ("UTF-8", "UTF-32LE");
printf ("%d\n", errno == EINVAL);
return 0;
}