#ocaml on 2017-08-30 — irc logs at freenode.irclog.whitequark.org

2017-07-13 10:09 companion_cube changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.05.0 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.05/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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00:04 <krktz> linking with /usr/lib/ocaml/libasmrun.a still gives me the "undefined reference to `caml_young_ptr'" errors (amoung others)

00:04 <krktz> what should I do?

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00:05 <krktz> (so far i'm doing the linking by hand since I couldn't figure out how to get ocamlopt to output non-elf binaries but maybe that's the solution?)

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00:14 <Armael> you would also need to link to the runtime an implementation for the primitives that are usually provided by the OS, I believe?

00:15 <Armael> I found this in my browser history, not sure how much it helps: https://github.com/mrvn/ocaml-rpi

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00:18 <krktz> yes, thanks

00:18 <krktz> i kind of forgot about that, thinking it would be the next problem :'

00:18 <Armael> it's probably fine as long as you write ocaml code that does not allocate

00:21 <Armael> (amusingly, you can go quite far without allocating, as https://www.ocamlpro.com/2016/04/01/asm-ocaml/ illustrates)

00:24 <Armael> anyhow if you manage to get something working I'd be interested to see the result

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00:27 <krktz> thanks

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07:25 <alexyan> Hello! I am using ppx_cstruct to generate conversion functions (int -> variant, variant->int, etc) for my variant types. I also need to generate yojson converter functions and I want to use ppx_deriving_yojson for this purpose. Can I use these ppx extensions simultaneously for one variant type?

07:25 <alexyan> It seems to be a problem since ppx_cstruct requires that the type should be defined inside [%%cenum ... ] construct

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09:36 <TobiasBales> Heyho, so I started taking a look at ocaml and immediately got stuck between tools :D

09:37 <Drup> Between the hammer and the anvil ? :p

09:37 <TobiasBales> Basicly I tried to get a simple project running using oases that uses core_exteded but when running the generated Makefile `ocamlfind ocamlc` fails with Error: Unbound module Core_extended

09:37 <TobiasBales> Sure feels like it

09:38 <Drup> you added core_extended to the list of dependencies and reran "oasis setup" ?

09:39 <TobiasBales> Yes I did. I used `oasis setup -setup-update dynamic` (cargo culted from somewhere on the internet)

09:40 <TobiasBales> https://gist.github.com/TobiasBales/0fec6bba39cc5102b06e44146d37bdc2 should contain all files that are involved. src_shell_prompt.ml should be src/shell_prompt.ml

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09:54 <Drup> you added the -tag file yourself ?

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09:55 <TobiasBales> yes, I was having some issues with it complaining about -threads not being there (for core_extended) I think. I just realised that that's gone now. So I can probably get rid of _tags altogether

09:56 <TobiasBales> If I remove the _tags file it failes with `ocamlfind: Error from package `threads': Missing -thread or -vmthread switch`

09:57 <TobiasBales> Interesting observation: when _tags is not present it calls `ocamlfind ocamlc -c -g -annot -bin-annot -package core_extended -I src -o src/shell_prompt.cmo src/shell_prompt.ml` and fails with the -threads/-vmthread message

09:58 <TobiasBales> when there is an empty _tags file it calls `ocamlfind ocamlc -c -g -I src -o src/shell_prompt.cmo src/shell_prompt.ml` (note the missing -package core_extended) and then fails with the `Error: Unbound module Core_extended`

09:59 <Drup> remove the _tags and add "threads" to the list of deps

09:59 <Drup> you shouldn't write _tags yourself like than when using oasis

09:59 <Drup> it conflicts with oasis' stuff

09:59 <TobiasBales> that's good to know thanks, I'll give it a try

09:59 <TobiasBales> okay

10:00 <TobiasBales> and it works, thanks a ton. It seems weird to me that I have to add a dependency of a dependency but I guess that's how ocaml works? :D

10:01 <Drup> No, it's just core_extended being wrong here

10:01 <Drup> well, and also the fact that "threads" is a bit weird

10:02 <Drup> (it's not only a library, it's also a modified runtime)

10:03 <TobiasBales> Okay, so special snowflake kind of thing and not the norm. And if I add a library as a dependency (under normal circumstances) I should not have to add it's dependencies (or part of them) to my project ones, yes?

10:03 <Drup> correct

10:04 <TobiasBales> Okay, thank you very, very much for the help and insight.

10:04 <Drup> TobiasBales: if you had to add all the dependencies of core_extended, it would be quite longer ...

10:05 <TobiasBales> yeah thats what seemed odd

10:06 <Drup> (try to type `opam list --resolve core_extended` :p)

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10:08 <TobiasBales> :D

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11:28 <theblatte> what's the difference between "unknown" and "other" in spacetime profiling results? Most of my allocation shows up a big "unknown" section of live words :|

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11:41 <Andres_> I would like to write a stateful protocol (over tcp) for some app similar to tcp ack-based protocol stack in ocaml. For instance, I have a start handshake, and then data passing, together with sending acks. Is there any peice of code that you can point me to as a best practice so I can start the basis using that structure?

11:45 <sgnb> I guess mirage has that

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11:50 <def`> theblatte: unknown... Could it be symbols lacking allocation information? (no debug symbols?)

11:50 <def`> s/symbols/values

11:50 <def`> could be C-allocated too

11:51 <theblatte> I wanted to use spacetime to see if the GC was losing its shit because of allocations from C, so I'm biased towards thinking it's C :p

11:52 <theblatte> hmm, so spacetime glumps everything without debug symbols together in "unknown"? that would be suboptimal as clicking on them would reveal their call sites, which could have debug symbols themselves

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21:16 <ShalokShalom> this article mentions "lack of support for shared libraries"

21:16 <ShalokShalom> http://roscidus.com/blog/blog/2014/06/06/python-to-ocaml-retrospective/

21:17 <ShalokShalom> so can I use OCaml to build applications who use QtQuick as an example and share this lib?

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