I am having problems trying to statically link readline. Dynamic linking 
is working fine, however. This works:

gcc - -Wall -c readline_wrp_c.c
ocamlc -custom -c readline_wrp_ocaml.mli
ocamlc -custom -c readline_wrp_ocaml.ml
ocamlc -custom -c readline_test.ml
ocamlc -custom -cclib -lreadline -o test_readline readline_wrp_c.o 
readline_wrp_ocaml.cmo readline_test.cmo


but changing the last line to:

ocamlc -custom -ccopt -static -cclib -lreadline -o test_readline 
readline_wrp_c.o readline_wrp_ocaml.cmo readline_test.cmo
or
ocamlc -custom -cclib /usr/lib/libreadline.a -o test_readline 
readline_wrp_c.o readline_wrp_ocaml.cmo readline_test.cmo
or
ocamlc -custom -o test_readline /usr/lib/libreadline.a readline_wrp_c.o 
readline_wrp_ocaml.cmo readline_test.cmo



will give the following error:

/usr/lib/ocaml/3.09.0/libcamlrun.a(unix.o): In function `caml_dlopen': 
warning: Using 'dlopen' in statically linked applications requires at 
runtime the shared libraries from the glibc version used for linking
/usr/lib/ocaml/3.09.0/libcamlrun.a(debugger.o): In function 
`caml_debugger_init': warning: Using 'gethostbyname' in statically 
linked applications requires at runtime the shared libraries from the 
glibc version used for linking
readline_wrp_c.o: In function 
`readline_wrp':readline_wrp_c.c:(.text+0x85): undefined reference to 
`readline'
readline_wrp_c.o: In function 
`add_history_wrp':readline_wrp_c.c:(.text+0x151): undefined reference to 
`add_history'
readline_wrp_c.o: In function 
`write_history_wrp':readline_wrp_c.c:(.text+0x1ad): undefined reference 
to `write_history'
readline_wrp_c.o: In function 
`read_history_wrp':readline_wrp_c.c:(.text+0x209): undefined reference 
to `read_history'
readline_wrp_c.o: In function 
`stifle_history_wrp':readline_wrp_c.c:(.text+0x267): undefined reference 
to `stifle_history'
readline_wrp_c.o: In function 
`readline_set_autocomplete_c':readline_wrp_c.c:(.text+0x3c6): undefined 
reference to `rl_attempted_completion_function'
readline_wrp_c.o: In function 
`completion_function':readline_wrp_c.c:(.text+0x3f6): undefined 
reference to `rl_completion_matches'
collect2: ld returned 1 exit status
Error while building custom runtime system



The functions indicated as having an undefined reference are all 
functions from the readline library libreadline. I got the same behavior 
using ocamlopt as well. Any idea what I am doing wrong?