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From: John Gerard Malecki <johnm@artisan.com>
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Date: Tue, 30 Oct 2001 15:08:00 -0800
To: caml-list@inria.fr
Subject: [Caml-list] Camlidl and order of include files
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Hi,

I just tried camlidl and am not sure if I am using it wrong or if I
have encountered a bug.  I want to access the (solaris) sysconf system
routine to find out how many processors on a machine.  I wrote this
idl file

  quote(C,"#include <unistd.h>")
  
  enum sysconf_names {
    SC_NPROCESSOR_ONLN = _SC_NPROCESSORS_ONLN
  };
  
  long sysconf([in] enum sysconf_names name);

I put this file in the camlidl-1.02/tests directory and executed 'make
sysconf.o' only to get

  ../compiler/camlidl -header sysconf.idl
  ocamlc -I ../lib -c sysconf.mli
  ocamlc -I ../lib -c sysconf.ml
  gcc -Wall -I.. -I/home/vtools/sun4os5/apps/ocaml-3.02/lib/ocaml -c sysconf.c
  In file included from sysconf.c:16:
  sysconf.h:17: `_SC_NPROCESSORS_ONLN' undeclared here (not in a function)
  sysconf.h:17: enumerator value for `SC_NPROCESSOR_ONLN' not integer constant

When I look in sysconf.c I notice

  #include "sysconf.h"
  
  #include <unistd.h>

If I change this order to

  #include <unistd.h>
  
  #include "sysconf.h"

The program now compiles and I am able to successfully use the code.

  :; cat test_sysconf.ml
  let _ =
    Printf.printf "sysconf ==> %d\n"
      (Sysconf.sysconf Sysconf.SC_NPROCESSOR_ONLN)
  :; ocamlc -c test_sysconf.ml 
  :; ocamlc -custom sysconf.cmo test_sysconf.cmo sysconf.o
  :; ./a.out
  sysconf ==> 2

Am I making proper use of camlidl?
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