[Ecls-list] Error compilling a shared library

[Константин]

I want to build a shared library from code in commonlisp.
I have a file simple.lisp with following content:

(defun hello () (format t "Hello, world!~%"))

Now I'm trying to start ecl and perform some commands. First of all I 
should compile program to object file:

> (compile-file "simple.lisp" :system-p t)

;;; Loading #P"/usr/lib64/ecl-11.1.1/cmp.fas"
;;;
;;; Compiling simple.lisp.
;;; OPTIMIZE levels: Safety=2, Space=0, Speed=3, Debug=0
;;;
;;; Compiling (DEFUN HELLO ...).
;;; End of Pass 1.
;;; Emitting code for HELLO.
;;; Note:
;;;   Invoking external command:
;;;   x86_64-pc-linux-gnu-gcc -I. -I/usr/include/ -D_GNU_SOURCE 
-D_FILE_OFFSET_BITS=64 -O2 -march=k8 -pipe -fPIC -D_THREAD_SAFE -Dlinux 
-O2 -w -c simple.c -o simple.o
;;; Finished compiling simple.lisp.
;;;
#P"/home/nitnatsnok/lisp/simple.o"
NIL
NIL

Well. Next I build a shared library as said in the official documentation:

> (c:build-shared-library "simple" :lisp-files '("simple.o") :init-name
"simple_init")

;;; Note:
;;;   Invoking external command:
;;;   x86_64-pc-linux-gnu-gcc -I. -I/usr/include/ -D_GNU_SOURCE 
-D_FILE_OFFSET_BITS=64 -O2 -march=k8 -pipe -fPIC -D_THREAD_SAFE -Dlinux 
-O2 -w -c /tmp/eclinit4NgxPc.c -o /tmp/eclinit4NgxPc.o
;;; Note:
;;;   Invoking external command:
;;;   x86_64-pc-linux-gnu-gcc -o libsimple.so -L/usr/lib64/ 
/tmp/eclinit4NgxPc.o (simple.o) -Wl,--rpath,/usr/lib64/ -shared -Wl,-O1 
-Wl,--sort-common -Wl,--as-needed -Wl,-O1 -Wl,--sort-common 
-Wl,--as-needed -lecl -lgmp -lgc -lpthread -ldl -lm
In function COPY-TO-SIMPLE-BASE-STRING, the value of the first argument is
   ("simple.o")
which is not of the expected type STRING

Available restarts:

1. (RESTART-TOPLEVEL) Go back to Top-Level REPL.

Broken at SI:BYTECODES. [Evaluation of: (C:BUILD-SHARED-LIBRARY "simple" 
:LISP-FILES '("simple.o") :INIT-NAME "simple_init")] In: #<process 
TOP-LEVEL>.

When I perform the same command with word "static" instead of "shared", 
everything is going fine:

> (c:build-static-library "simple" :lisp-files '("simple.o") :init-name
"simple_init")

;;; Note:
;;;   Invoking external command:
;;;   x86_64-pc-linux-gnu-gcc -I. -I/usr/include/ -D_GNU_SOURCE 
-D_FILE_OFFSET_BITS=64 -O2 -march=k8 -pipe -fPIC -D_THREAD_SAFE -Dlinux 
-O2 -w -c /tmp/eclinitM0T9S2.c -o /tmp/eclinitM0T9S2.o
;;; Note:
;;;   Invoking external command:
;;;   x86_64-pc-linux-gnu-ar cr libsimple.a /tmp/eclinitM0T9S2.o simple.o
;;; Note:
;;;   Invoking external command:
;;;   x86_64-pc-linux-gnu-ranlib libsimple.a
#P"libsimple.a"

What am I doing wrong?
Thank you for help in advance.