Le 14/09/2011 17:09, Benedikt Meurer a écrit :
On Sep 14, 2011, at 17:00 , Romain Bardou wrote:
My first problem is: I tried something similar for native code (using ocamlopt
instead of ocamlc, .cmx instead of .cmo and .cmxa instead of .cma) but
ocamlmklib fails with the following error:
/usr/bin/ld: wrapper.o: relocation R_X86_64_32 against `.rodata' can
not be used when making a shared object; recompile with -fPIC
wrapper.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
I have absolutely no idea what this means, I'm really confused here and Google
does not help.
The error messages already includes the answer, you need to pass -fPIC to the C
compiler when compiling wrapper.c, i.e.
$ gcc -c -fPIC -o wrapper.o wrapper.c
Romain Bardou
HTH,
Benedikt
Thanks for your quick answer.
Actually I tried adding the -fPIC option like this:
ocamlopt -c -ccopt -fPIC wrapper.c
ocamlopt -c mylib.ml
ocamlmklib wrapper.o mylib.cmx -o mylib
ocamlopt -c main.ml
ocamlopt dynlink.cmxa main.cmx -o main
CAML_LD_LIBRARY_PATH=. ./main mylib.cmxa
But when Dynlink.load is called, it fails with the following error:
error loading shared library: /home/.../mylib.cmxa: invalid ELF header
I'm thinking this is because the .cmxa has not been compiled with the
-shared option, but I don't know how to tell ocamlmklib to compile with
the -shared option.
Cheers,
--
Romain Bardou
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