Re: Example OMakefile to package OCaml code as a C library

[Aleksey Nogin <nogin@metaprl.org>]

On 28.03.2007 01:40, Joel Reymont wrote:

> Does anyone have an example OMakefile that can be used to package OCaml 
> code as a C library?
> 
> This is along the lines of what I'm trying to accomplish:
> 
> ocamlopt -output-obj -o fibcaml.o fib.ml
> ocamlopt -c fibwrap.c
> cp /usr/local/lib/ocaml/libasmrun.a libfib.a
> ar r libfib.a fibcaml.o fibwrap.o
> 
Joel,

The above seems relatively straightforward. I would imagine that you can 
give ocamlopt a list of .cmx files instead of the .ml files (this should 
make things more modular and incremental). So you just do something like:

-----------

LIB = fib
CFILES = fibwrap
MLFILES = fib

OCAMLLIB = $(dir $"$(shell $(OCAMLC) -where)")

$(LIB)caml$(EXT_OBJ): $(addsuffix .cmx, $(MLFILES))
    $(OCAMLOPT) $(OCAMLFLAGS) $(OCAMLOPTFLAGS) -output-obj -o $@ 
$(OCamlLinkSort $+)

OBJS = $(addsuffix $(EXT_OBJ), $(LIB)caml $(CFILES))

lib$(LIB)$(EXT_LIB): $(OCAMLLIB)/libasmrun$(EXT_LIB) $(OBJS)
    cp -f $< $@
    ar q $@ $(OBJS)

----------

The above can also be easily made into a function that can be reused:

----------

OCAMLLIB = $(dir $"$(shell $(OCAMLC) -where)")

MakeWrapLib(LIB, MLFILES, CFILES) =
    $(LIB)caml$(EXT_OBJ): $(addsuffix .cmx, $(MLFILES))
       $(OCAMLOPT) $(OCAMLFLAGS) $(OCAMLOPTFLAGS) -output-obj -o $@ 
$(OCamlLinkSort $+)

    OBJS = $(addsuffix $(EXT_OBJ), $(LIB)caml $(CFILES))

    lib$(LIB)$(EXT_LIB): $(OCAMLLIB)/libasmrun$(EXT_LIB) $(OBJS)
       cp -f $< $@
       ar q $@ $(OBJS)

    return lib$(LIB)$(EXT_LIB)

MakeWrapLib(fib, fib, fibwrap)

----------

Aleksey