Dear Mike,

I was able to successfully load delimcc into the toplevel after applying
the tiny patch below.
You can give it a try by doing:

  opam source delimcc
  cd delimcc.(version)
  (apply patch)
  opam pin add .

(you have to replace the stuff between parentheses by whatever is correct
in your setup.)

diff --git a/stacks.c b/stacks.c
index fdab2a7..5765710 100644
--- a/stacks.c
+++ b/stacks.c
@@ -203,13 +203,13 @@ value copy_stack_fragment(const value vek1)
 #endif

   if (size < Max_young_wosize) {
-    block = alloc(size, 0);
+    block = caml_alloc(size, 0);
     memcpy(&Field(block, 0), tp2, size * sizeof(value));
   } else {
-    block = alloc_shr(size, 0);
+    block = caml_alloc_shr(size, 0);
     mlsize_t i;
     for (i = 0; i < size; i++)
-      initialize(&Field(block, i), tp2[i]);
+      caml_initialize(&Field(block, i), tp2[i]);
   }

   /* We check the invariants after the allocation of block, which may
@@ -382,4 +382,3 @@ value dbg_note(const value message)
   fprintf(stderr,"%s\n",String_val(message));
   return Val_unit;
 }

Hope it helps,
Nicolás



On Fri, Feb 23, 2018 at 12:18 AM, Michael C Vanier <mvanier@cms.caltech.edu>
wrote:

> I've been trying to use the delimcc delimited continuation library, but so
> far I've been unsuccessful.  I'm using OCaml 4.06.1 and I've tried it on
> both Mac OS X (High Sierra) and Ubuntu MATE 17.10. I'm fine sticking to
> bytecode.  The opam package installs correctly but when you try to run it
> you get errors from the dynamically-linked libraries.  On Mac OS X I get
> this:
>
> # #require "delimcc";;
> Cannot load required shared library dlldelimcc.
> Reason: /Users/mvanier/.opam/4.06.1/lib/stublibs/dlldelimcc.so:
> dlopen(/Users/mvanier/.opam/4.06.1/lib/stublibs/dlldelimcc.so, 10):
> Symbol not found: _alloc
>   Referenced from: /Users/mvanier/.opam/4.06.1/lib/stublibs/dlldelimcc.so
>   Expected in: flat namespace
>  in /Users/mvanier/.opam/4.06.1/lib/stublibs/dlldelimcc.so.
>
> And on Ubuntu I get this:
>
> # #require "delimcc";;
> /home/mvanier/.opam/4.06.1/lib/delimcc: added to search path
> /home/mvanier/.opam/4.06.1/lib/delimcc/delimcc.cma: loaded
> Cannot load required shared library dlldelimcc.
> Reason: /Users/mvanier/.opam/4.06.1/lib/stublibs/dlldelimcc.so:
> dlopen(/Users/mvanier/.opam/4.06.1/lib/stublibs/dlldelimcc.so, 10):
> Symbol not found: initialize.
>
> However, in either case I can do:
>
> # open Delimcc;;
>
> and it reports no errors, but then if I try e.g.:
>
> # shift;;
> Reference to undefined global `Delimcc`
>
> so it appears the library isn't there or isn't functional. Compiling from
> the delimcc source also appears to work, but gcc warns about implicit
> declarations of "alloc", "alloc_shr" and "initialize" when compiling
> stacks.c, which makes sense.  Compiling any of the test programs also fails.
>
> So it appears that this library no longer works.  Does anyone know any way
> to make it work?
>
> Thanks in advance,
>
> Mike
>
>
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