Linking problem under linux

[m_a_xim]

Hello,
I'm actually learning assembly and I have a problem even though I am copying word for word what my book tells me. Here's the code:

1  .section .data
  2 helloworld:
  3  .ascii "hello world\n\0"
  4  .section .text
  5  .globl _start
  6 _start:
  7  pushq $helloworld
  8  call printf
  9  pushq $0
 10  call exit

(there used to be 'pushl's but as I am using an AMD64 I had to replace them with 'pushq's)
It is then written that I must compile and link in this way:

as helloworld-lib.s -o helloworld-lib.o
ld -dynamic-linker /lib/ld-linux.so.2 \
   -o helloworld-lib helloworld-lib.o -lc

It works without printing out an error but during execution of the newly generated executable, it crashes immediately and I get this:
"bash: ./helloworld-lib: Accessing a corrupted shared library"

I also tried replacing "-dynamic-linker /lib/ld-linux.so.2" by "-dynamic-linker /lib/ld-linux-x86-64.so.2" but I get this error now when I execute "Illegal instruction".
After checking with gdb, I conclude that the SIGILL is sent during the fprintf function call.

Any idea how I could solve this problem?
Thanks.