Hi,

I'm not an expert at all with OCamlMakefile, but I guess that comes from
the fact the compiler embeds Str in both libraries "a.cma" and "b.cma".
Doing it by hand:

$ ocamlc -a -o a.cma a.ml
$ ocamlc -a -o b.cma b.ml
$ ocamlc -o a.out str.cma a.cma b.cma test.ml

You don't need to give "str" as Lib when generating your libraries, only
when producing your executable :-) If you give str.cma when generating your
libraries:

$ ocamlc -a -o a.cma str.cma a.ml
$ ocamlc -a -o b.cma str.cma b.ml
$ ocamlc -o a.out a.cma b.cma test.ml
  File "b.cma(Str)", line 1:
  Warning 31: files b.cma(Str) and a.cma(Str) both define a module named Str


Pierrick

2015-03-06 11:16 GMT+01:00 Vu Ngoc San <san.vu-ngoc@laposte.net>:

> Hello list
>
> I have a basic compilation question:
> I want to write two independent libraries, say A an B, and both use a
> third library, eg. Str
>
> When I write a program which uses A and B, I get
> File "b.cma(Str)", line 1:
> Warning 31: files b.cma(Str) and a.cma(Str) both define a module named Str
>
> How to get rid of this warning ? Am I doing something wrong ?
>
> Thanks
> San
>
> ----
>
> Here is a minimal example:
>
> (* This is a.ml *)
>
> let version = "A";;
> let _ = print_endline (Str.string_before "Loading the A library -- foo"
> 22);;
>
> (* This is b.ml *)
>
> let version = "B";;
> let _ =  print_endline (Str.string_before ("Loading the " ^ version ^"
> library -- bar") 23);;
>
> # this is Makefile.a
>
> SOURCES = a.ml
> LIBS = str
> RESULT = a
> all: byte-code-library
> -include OCamlMakefile
>
> # this is Makefile.b
>
> SOURCES = b.ml
> LIBS = str
> RESULT = b
> all: byte-code-library
> -include OCamlMakefile
>
> (* this is test.ml *)
>
> let _ = print_endline (Str.string_before ("Hello " ^ A.version ^ " and " ^
> B.version ^"---")  13);;
>
> # this is Makefile.test
>
> SOURCES = test.ml
> LIBS = a b
> RESULT = test
> all: byte-code
> -include OCamlMakefile
>
>
>
> --
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> https://sympa.inria.fr/sympa/arc/caml-list
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>



-- 
Pierrick COUDERC

*PhD Student at OCamlPro / ENSTA Paristech Université Paris Saclay*