OCaml - compiling a program as a library -

i have ocaml program(with main method - generates executable) , want use library.

i compiling program this: ocamlc -i somedir -g -unsafe lotsofcmofiles -o outputfile , program works fine.

now i'm removing line makes executable(something let _ = ...) , adding -a parameter compile command: ocamlc -a -i somedir -g -unsafe lotsofcmofiles -o outputfile.cma

but somehow can't load generated .cma file ocamltop , ocamlbrowser shows empty list. when try load ocamltop:

# #load "outputfile.cma";; error: reference undefined global `xyz' 

and i'm 100% sure xyz.cmo included in lotsofcmofiles.

am giving parameter wrong while compiling? or else, should load program in ocamltop ? (i'll use library in program, i'm giving ocamltop outputs example)

any helps appreciated.

edit: can managed compile , load @cago, can load library, , when don't remove main let _ = ... line it's automatically run when load .cma.

but still can't open modules. strangely, doesn't raise exception

open main 

but when call function module main:

# somefun;; error: reference undefined global `main' 

and ocamlbrowse still shows empty list. why that?

edit2: realized open main doesn't fail because have main module in same folder(even though didn't explicitly load it). if move .cma file somewhere else , load it, works(ie. main function runs automatically), can't open modules though ocamlobjinfo shows modules.

edit3: -i doesn't help:

$ ocaml         ocaml version 4.00.1  # #load "lib.cma";; ok # open lib;; error: unbound module lib #  $ ocaml -i libfolder             ocaml version 4.00.1  # #load "toylib.cma";; ok # open lib;; # fun;; error: reference undefined global `lib' 

some of cmo in lotsofcmofiles need know module xyz. need take care of dependency between cmo files.

for example:

toto.ml:

let x = "toto" 

titi.ml:

let y = toto.x ^ " titi"  ocamlc -c toto.ml ocamlc -c titi.ml ocamlc -a  titi.cmo toto.cmo -o lib.cma (* here  probleme *)  # #load "lib.cma" error: reference undefined global `toto' 

because titi depends on toto need change order of cmos:

ocamlc -a toto.cmo titi.cmo -o lib.cma   # #load "lib.cma" # titi.y;;  - : string = "toto titi" 

edit:

if cma in subdirectory example, when call ocaml need specify path:

ocaml -i subdir/ (* subdir contains lib.cma *)  # #load "lib.cma" # toto.x;; - : string = "toto"