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Re: [Xen-devel] ocaml bindings

On 03/04/13 21:33, Andrew Cooper wrote:
On 03/04/13 21:24, AL13N wrote:
Op woensdag 3 april 2013 20:36:51 schreef Andrew Cooper:
On 03/04/13 20:24, AL13N wrote:
Op woensdag 3 april 2013 20:18:53 schreef AL13N:
Op woensdag 3 april 2013 18:12:21 schreef Andrew Cooper:
On 03/04/13 18:03, AL13N wrote:
i'm the Mageia Xen package maintainer, and a user reported that i had
missing symbols in my ocaml bindings:


i'm using Xen 4.2.1 and ocaml 3.12.1

the problem is that if you just to a simple hello world and you're
certain bindings (eg: xeneventch): you get missing symbols. (others
to be fine).

I know next to nothing about ocaml, and it could be my build process,
kinda need some help about this.

this is my spec file:

Thanks in advance

PS: we're at version freeze and release freeze is pretty soon :-S
This is because the ocaml tools embed the build target links in the
generated libs.  If you try to link against them later outside the build
environment, it will break.

Attached is the patch used to fix this problem for XenServer for Xen
thanks alot for the very quick help, i'm testing right now...
it seems the tests definately improve things...

[root@localhost ~]# cat testfile.ml
print_string "hello"
[root@localhost ~]# ocamlfind ocamlc -o test -thread -package xeneventchn
linkpkg -g testfile.ml
[root@localhost ~]# ./test
Fatal error: cannot load shared library dllxeneventchn_stubs
Reason: dllxeneventchn_stubs.so: cannot open shared object file: No such
file or directory

(i have no idea if i need to ./test execute this, or if this is normal
You presumably need tools/ocaml/libs/eventchn/dllxeneventchn_stubs.so on
your load path.  Under my system, would be installed to
[root@localhost ~]# ls /usr/lib64/ocaml/xeneventchn/ -lsha
total 64K
    0 drwxr-xr-x 1 root root  246 Apr  3 19:16 ./
    0 drwxr-xr-x 1 root root 7.2K Apr  3 19:02 ../
4.0K -rw-r--r-- 1 root root  150 Apr  3 18:35 META
  12K -rwxr-xr-x 1 root root  11K Apr  3 18:40 dllxeneventchn_stubs.so*
  24K -rw-r--r-- 1 root root  21K Apr  3 18:35 libxeneventchn_stubs.a
8.0K -rw-r--r-- 1 root root 4.5K Apr  3 18:35 xeneventchn.a
4.0K -rw-r--r-- 1 root root 2.8K Apr  3 18:35 xeneventchn.cma
4.0K -rw-r--r-- 1 root root 1.2K Apr  3 18:35 xeneventchn.cmi
4.0K -rw-r--r-- 1 root root  223 Apr  3 18:35 xeneventchn.cmx
4.0K -rw-r--r-- 1 root root  258 Apr  3 18:35 xeneventchn.cmxa

what is this "load path" is this something like LD_LIBRARY_PATH ?
Unfortunately I am no expert in the workings of Ocaml.  I will have to
defer to others.  Jon/Dave - any ideas?


Hmm. We don't actually use the bytecode compiler/toplevel, so there's a good chance that the patch doesn't fix them correctly.

Could you please check to see whether it sorts out native code compilation for you? Try:

jludlam@humongous:~$ cat test.ml
let _ =
    let open Xenctrl in
    let v = with_intf version in
    Printf.printf "%d.%d%s\n" v.major v.minor v.extra
jludlam@humongous:~$ ocamlfind ocamlopt -o test -thread -package xenctrl -linkpkg test.ml
jludlam@humongous:~$ sudo ./test

Meanwhile, I'll investigate to see whether I can repro your problem (my ocaml libs are installed slightly differently than usual at the moment).


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