So... I was trying to figure out how to make a pull request on the delimcc repo (if there is one) and it was an exercise in frustration.  The "opam-publish" tool doesn't seem to work anymore with recent ocaml builds due to a nest of dependency issues:

=====

> opam install opam-publish
The following dependencies couldn't be met:
  - opam-publish -> opam-lib (= 1.2.0 | = 1.2.2) -> dose < 3.4.0 -> extlib < 1.7.0
  - opam-publish -> opam-lib (= 1.2.0 | = 1.2.2) -> dose < 3.4.0 -> extlib-compat < 1.7.0
  - opam-publish -> opam-lib (= 1.2.0 | = 1.2.2) -> dose < 3.4.0 -> ocamlgraph <= 1.8.5
  - opam-publish -> publish -> opam-publish > 0.3.4 -> opam-lib > 1.2.2 -> jsonm -> uutf (<= 0.9.4 | >= 1.0.0)
  - opam-publish -> publish -> opam-publish > 0.3.4 -> opam-lib > 1.2.2 -> cmdliner <= 0.9.8
  - opam-publish -> publish -> opam-lib (= 1.2.2 | > 1.2.2) -> cmdliner <= 0.9.8
  - opam-publish -> publish -> opam-lib (= 1.2.2 | > 1.2.2) -> dose < 3.4.0 -> ocamlgraph <= 1.8.5
  - opam-publish -> publish -> opam-lib (= 1.2.2 | > 1.2.2) -> dose < 3.4.0 -> extlib-compat < 1.7.0
  - opam-publish -> publish -> opam-lib (= 1.2.2 | > 1.2.2) -> dose < 3.4.0 -> extlib < 1.7.0
  - opam-publish -> publish -> opam-lib (= 1.2.2 | > 1.2.2) -> jsonm -> uutf (<= 0.9.4 | >= 1.0.0)
Your request can't be satisfied:
  - cmdliner.0.9.4 is in conflict with uutf.1.0.1
  - extlib-compat<1.7.0 is not available because your system doesn't comply with ocaml-version < "4.05.0".
  - extlib<1.7.0 is not available because your system doesn't comply with ocaml-version < "4.05.0".
  - ocamlgraph.1.8.5 is not available because your system doesn't comply with ocaml-version < "4.06.0".
  - ocamlgraph<=1.8.5 is not available because your system doesn't comply with ocaml-version < "4.06.0".
  - uutf<=0.9.4 is not available because your system doesn't comply with ocaml-version >= "4.00.0" & ocaml-version < "4.06.0".

No solution found, exiting

=====

I tried forking the opam-repository repo but there is only metadata about the various packages and not the actual code to make a patch on.  Is there some documentation on how to submit a bug fix to a package?  Sorry if this is a dumb question.

Mike

It works!  Thank you so much Nicolas!

Mike

On 2/22/18 3:42 PM, Nicolás Ojeda Bär wrote:

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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