gildor changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/ | OCaml 3.12.0 http://bit.ly/aNZBUp
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<kaustuv> thelema_: I agree with bluestorm's proosal to change the inline test syntax to avoid using (** and **) to prevent confusion with ocamldoc. (IIRC I suggested as much a while back.)
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<rixed> Anyone using PXP for parsing an XML without DTD (but with a schema) ?
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<joelr> good day
<joelr> Should I pay attention to this warning from Oasis? findlib: [WARNING] Interface service.cmi occurs in several directories: src/db, src/indexing
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<rproust> joelr: it means that findlib finds two distinct interfaces with the same name
<rproust> it can be dangerous because it might lead to the wrong interface being used
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<rproust> Idk how ocamlfind chooses which interface to take…
<joelr> rproust: this is easily fixed, e.g.
<joelr> Executable indexing
<joelr> Path: src/indexing
<joelr> MainIs: service.ml
<joelr> Instead of Path: src, MainIs: indexing/sevice.ml
<joelr> The latter causes findlib to complain
<rproust> haven't yet started using oasis, but I'll try to remember this for later…
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<rixed> the directories listed in the OCAMLPATH envvar are used from first to last, so the first dir where the interface can be found will be used I'd say.
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<joelr> Is there an easy way to stuff an array of floats into a string (and get it back)?
<joelr> I would like to keep things binary, btw, and use as few allocations as possible
<thelema_> joelr: Obj.magic?
<joelr> How?
<joelr> Hmm... I could use Marshal just as well, I suppoe
<avsm> it actually seems quite hard to efficiently marshal a float in ocaml
<avsm> # String.length ( (Marshal.to_string 2.0) [] );;
<joelr> oh...
<avsm> - : int = 29
<avsm> the header is fixed
<joelr> ouch!
<avsm> it's better for float arrays though, as the header is just a fixed prefix
<thelema_> joelr: let to_string (x: float array) = (Obj.magic x : string)
<avsm> uh, wouldnt that corrupt your heap? different tag for strings and float arrays
<thelema_> but the ocaml runtime will still treat the object as a float array, and I wouldn't recommend using any String.* functions on it.
<thelema_> avsm: no, it'd just lead to segfaults if you tried to use it as a string.
<avsm> thats what i meant. not much point converting it a string if you can't ever touch the thing :)
<thelema_> fair enough.
<thelema_> there's also Int64.bits_of_float which gets you a 64-bit number representing the bits of the given float.
<thelema_> but what you want to do is so unsafe and system specific that you might as well do it in C if you want minimal copying. In ocaml, the only way available is that function plus some shifting and masking to build characters out of a Int64
<joelr> I'm using google protocol buffers and would like to ship an array of 150 floats between processes
<joelr> And to do that optimally, it looks like I need to convert it to a string and send it as a string
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<joelr> Otherwise, I'll be converting my array of floats to a list of floats. May not be a big deal at all.
<joelr> thelema_: but I see what you are saying
<avsm> converting the float array to a list would box each element. C binding to take a float_array tag and write it would be most efficient
<thelema_> most efficient would be a google protocol buffers function that takes a float array and sends it as a string
<thelema_> skipping the need to actually build the ocaml string
<thelema_> which requires a header and encoding the length in the tail.
<joelr> right
<thelema_> I assume there's already C shims for gpb, why not extend them\
<joelr> We are using piqi
<joelr> Which is OCaml
<joelr> Then again, we are also using Redis and the arrays are sparse so I may as well store values in a sorted set
<thelema_> optimize later. for now, just use the .to_list
<joelr> yeah
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<NaCl> is there a way to make omake log the build checks it does?
<NaCl> it says it can't find some C calls, and would like to figure out why
<thelema_> omake --help has a ton of -debug-foo arguments, maybe -debug-deps?
<NaCl> that deals with ocaml deps, apparently
<NaCl> however it's doing this is not working in my build environment
<NaCl> bleh
<thelema_> can you add a manual dependency on the file it needs to link in?
<NaCl> in theory, yes. but the dependency is there, it's just not scanning it correctly
<NaCl> and it would be nice if there was a way to make it save all the temporary files it makes
<thelema_> I assume --verbose doesn't get you the info you want?
<NaCl> no
<NaCl> and I think I may have found the problem
<NaCl> oh, wait, no, /usr/include is used by default
<adrien> stracing the process is always possible, it generates a lot of data but starting from the end in emacs will most probably make it ok to pinpoint the issue
<NaCl> the nice thing about autotools is that it logs *everything*
<NaCl> it even looks like the compiler commands are working
<adrien> I think it wasn't enough for me once actually: I added a "set -x" at the beginning of the configure script ;p
<NaCl> oh, wait, what?
<NaCl> yeah, the compiler is failing
* NaCl doesn't know why because I get no output
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<adrien> pastebin the strace output?
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<NaCl> this is going to be huge, uh...
<adrien> NaCl: scp it here then: pm?
<NaCl> shoot
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<mrspastic> hello
<thelema_> hi
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<mrspastic> i have a question about key bindings if someone can help me
<mrspastic> does anyone use the ocaml console in linux?
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<thelema> mrspastic: try 'rlwrap ocaml'
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<mrspastic> thanks i will start from there
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<everyonemines> Random.init will affect other threads but not a forked process, is that right?
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