Hi,
How do you link to external C libraries when calling camlp4? When
calling ocamlc, we can use the -custom and -cclib flags in order to
statically link a library. However, the camlp4 executable seems to ignore
these flags when called. As an example, given the files:
-----------------
$ cat Makefile
all:
gcc -c myadd.c
ocamlc -c myadd.ml
ocamlmktop -custom -cclib myadd.o -o mytop myadd.cmo
ocamlc -c -I +camlp4 -I +camlp4/Camlp4Parsers -pp camlp4of
myquot.ml
clean:
rm *.cmo
rm *.cmi
rm *.o
$ cat myadd.c
int add1(int x){
return x+1;
}
$ cat myadd.ml
external add1 : int->int = "add1";;
$ cat myquot.ml
module CamlSyntax = Camlp4OCamlParser.Make(
Camlp4OCamlRevisedParser.Make(Camlp4.PreCast.Syntax));;
open Camlp4.PreCast;;
let expr_of_string = CamlSyntax.Gram.parse_string CamlSyntax.expr_eoi;;
module MyGram = Camlp4.PreCast.MakeGram(Camlp4.PreCast.Lexer);;
let term = MyGram.Entry.mk "term";;
let term_eoi = MyGram.Entry.mk "term quotation";;
EXTEND MyGram
GLOBAL: term term_eoi;
term:
[ "simple"
[ `INT(i,_) -> <:expr< $`int:Myadd.add1 i$ >> ]
];
term_eoi:
[[ t = term; `EOI -> t ]];
END;;
let expand_quot loc loc_opt s = MyGram.parse_string term_eoi loc s;;
Syntax.Quotation.add "abc" Camlp4.PreCast.Syntax.Quotation.DynAst.expr_tag
expand_quot;;
$ cat test.ml
let x= <:abc< 4 >>;;
-----------------
If we call:
-----------------
$ ./mytop dynlink.cma camlp4of.cma myquot.cmo
Objective Caml version 3.11.2
Camlp4 Parsing version 3.11.2
# let x= <:abc< 4 >>;;
val x : int = 5
#
-----------------
everything works fine since mytop has been compiled with the correct C
object file. However, if we try the following call:
-----------------
$ camlp4of myadd.cmo myquot.cmo test.ml
Camlp4: Uncaught exception: DynLoader.Error ("./myquot.cmo", "error while
linking ./myquot.cmo.\nThe external function `add1' is not available")
-----------------
we have an error since the C object file has not been linked. How do we
correctly preprocess the file test.ml?
Joe
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