--- Log opened Sat Jan 15 00:00:03 2011
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02:17 < tav> sorry about the plexdev spam earlier guys
02:18 < tav> i was on holiday for a few weeks and came back to find that the
machine which handles the mirroring to github had gone to happy sleep =)
02:19 < tav> anyways, the machine is awake again after being asleep for 5
days and both the github mirror and plexdev are back in sync with upstream
02:19 < yebyen> plexdev?
02:19 < tav> sorry for any inconvenience caused
02:19 < yebyen> what's that about
02:20 < tav> yebyen: plexdev is the bot that informs the channel about
commits made to the Go repository, e.g.
02:20 < tav> <plexdev> http://is.gd/BIABr4 by [Brad Fitzpatrick] in
go/src/pkg/http/ -- http: fix scheme-relative URL parsing; add ParseRequestURL
02:20 < yebyen> oh
02:20 < yebyen> here i am thinking it's a go module
02:20 < tav> ah, heh, sorry
02:21 < yebyen> and why anyone would be upset that he's not been updated in
5 days
02:21 < yebyen> but that makes more sense
02:22 < tav> i sync the hg repo to a github repo, and then use a post-commit
hook on github to update the bot which then informs the channel
02:24 < tav> i surprisingly got several emails and github messages asking me
about the git mirror, so i figured if a few people were willing to go to the
trouble of hunting down my email address to let me know the mirror wasn't
updated...
02:25 < tav> anyways, what you hacking on yebyen ?
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02:29 < yebyen> i haven't written any go code in a while
02:29 < yebyen> unfortunately
02:29 < yebyen> i'm trapped in php land
02:29 < yebyen> libevent, libindicate, pino-twitter
02:29 < yebyen> are some things i'd like to get compiled
02:29 < yebyen> exherbo
02:29 < yebyen> trying to get this debian system finished right now
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02:33 < tav> sorry about the php trap
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02:34 < tav> but, thanks for the pointers to libindicate and pino-twitter
02:34 < Broady> anyone here used redis?
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02:34 < tav> Broady: me...
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02:34 < Broady> tav: general thoughts/impressions?
02:35 < tav> i love it =)
02:35 < tav> depending on what you're trying to do, it's a very useful tool
to have in your toolbox
02:35 < Broady> cool.  have an idea for a little project that could make use
of it :)
02:35 < Broady> basically a micro-blog, but with a focus/structure in mind
02:36 < tav> aha, nice
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02:37 < tav> at some point this year, i hope to release an app-engine-like
datastore written in Go and using a slightly forked redis
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02:38 < Broady> tav: great
02:38 < adu> noooooooooo not php
02:39 < tav> adu: heh, well, it's not always by choice...
02:39 < Broady> if it pays the bills
02:39 < adu> ya i know
02:39 < adu> I need to pay the bills
02:39 < adu> I've applied to approx 2 companies a week
02:40 < tav> no luck yet?
02:40 < adu> and I've gone to 5 interviews so far
02:40 < adu> nope
02:40 < Broady> awesome.  i love how redis docs tell you the time complexity
of every operation
02:40 < tav> adu: damn, sorry to hear that =(
02:40 < Namegduf> adu: Do you visibly wince when they tell you the languages
they're working with?
02:41 < tav> Broady: yeah, i hear that gives people a very good impression
=)
02:41 < tav> Namegduf: lol
02:41 < adu> I think they see "Haskell" on my resume, and think...  "this
guy must be making stuff up"
02:41 < tav> heh
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02:41 < adu> Namegduf: only if its VB
02:42 < Namegduf> Understandable.
02:42 * adu visibly winces at C# too
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02:42 < adu> not at Java tho
02:42 < adu> after making 3 Android apps, Java is OK
02:42 < Broady> I kind of like c#
02:43 < exch> I think it's a good idea to find out about their languages of
choice, before you write the letters
02:43 < Broady> though I've spent limited time with it, and a lot with Java
02:43 < tav> exch: good advice
02:43 < adu> exch: good idea
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02:46 < jeff2> 6l: go/pkg/darwin_amd64/lua51.a(golua.o)(__TEXT/__text):
luaL_checkudata: not defined -- how can I diagnose this error?  it occurs in a
cgo-based library.  I've ensured it is linking with the C library where the
symbols are found
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02:48 < jeff2> i.e., CGO_LDFLAGS is set to -llua
02:48 < exch> Is it the correct library version you are linking against?
02:49 < exch> I don't know if this works on darwin, but I usually set
CGO_LDFLAGS to `pkg-config --libs lua`
02:49 < exch> or whatever lib I am linking to
02:50 < exch> when I run that in my shell, it yields '-llua -lm'
02:50 < jeff2> yeah that's what I'm doing actually
02:51 < jeff2> though you might be onto something that I may have multiple
versions of lua installed and it could be finding different pieces from
each..looking into it
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02:54 < jeff2> nope I only have one version installed, 5.1.4...  hmm
02:56 < exch> hmm.  perhaps the package itself was written against an
outdated version, and references code that doesnt exist anymore.  Not really sure
what else it could be
03:00 < jeff2> well I can find the symbols in the library I'm linking to.
6l's linking model is confusing..  with ld, I'd just specify the libraries as
command-line arguments
03:03 < adu> i think 6*'s linking is confusing
03:03 < jeff2> how does it work?
03:03 < adu> i dunno
03:03 < adu> i just like the language
03:04 < adu> but I would like it more if there was a Go-- mode
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03:04 < adu> that worked kinda like C with closures
03:05 < adu> jeff2: have you seen by blog?
03:07 < jeff2> adu: not that I know of, what is it?
03:07 < adu>
http://straymindcough.blogspot.com/2011/01/golang-proposals.html
03:07 < adu> apparently, there have been billions of generics requests from
people not groking the "beauty" of Go interfaces
03:08 < Namegduf> Not just interfaces
03:08 < adu> apparently, I'm one of them
03:08 < Namegduf> Anything and everything
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03:08 < adu> Namegduf: you mean proposals for everything?
03:09 < Namegduf> Proposals finding issue with anything and everything
03:09 < Namegduf> Not essentially for everything
03:09 < adu> ah
03:11 < exch> The gist of most of them is "I love Go, I just wish it wasn't
like Go"
03:11 < adu> lol
03:12 < adu> anyways, I'm not expecting anyone to scratch my itch
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03:12 < Namegduf> Then you'd scratch theirs
03:12 < adu> my compiler will have a Go-- mode
03:12 < Namegduf> And soon Go would become full of itch-scratching
03:12 < Namegduf> And that'd be weird
03:12 < adu> lol
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07:17 < plexdev> http://is.gd/jNplga by [Rob Pike] in go/src/pkg/bytes/ --
bytes.Buffer: fix typo in comment (doubled 'to')
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11:25 < KBme> how does one delete a slice element?
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11:32 < taruti> KBme: append+copy
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11:34 < KBme> ah, ok
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12:10 < aiju> hm not really go-specific question, but anyway
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12:11 < aiju> i have a list of possibly overlapping intervals and want to
convert it into a list of non-overlapping ones by dividing them appropriately
12:11 < aiju> anyone know an algorithm for that?
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12:25 < nsf> aiju: I can imagine a brute force solution for that
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13:08 < quantumelixir> aiju: sort the intervals by their beginning time and
then iterate through the intervals checking if the end time of the previous
interval is before/after the begin time of the current interval
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13:08 < aiju> quantumelixir: that one fails if several intervals overlap
13:08 < quantumelixir> then, you would create new intervals appropriately
13:09 < aiju> i'm right working on iterating through the interval limits
currently
13:09 < quantumelixir> aiju: what is the behaviour you expect in that case?
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13:09 < quantumelixir> the algo I'm referrin to, would make sure that at
each point in time there is at most one interval only
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13:42 < quantumelixir> aiju: http://www.ideone.com/G061K
13:43 < aiju> eh i already solved it
13:43 < aiju> https://code.google.com/p/gofy/source/browse/kernel/frame.go
processe820()
13:43 < quantumelixir> was that the behaviour you wanted?
13:44 < aiju> well; your example doesn't compile
13:45 < quantumelixir> it doesn't compile on that website
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13:45 < quantumelixir> but it does on my computer
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13:45 < quantumelixir> aiju: did you try it on your machine?
13:49 < aiju> no
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14:20 < zozoR> fmt.Printf("%0000d", 522) isnt that supposed to output
"0522"?  if not, how would i do that
14:22 < zozoR> nevermind
14:22 < zozoR> fmt.Printf("%0.4d")
14:23 < zozoR> oh, %.4d is enough
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14:52 < aiju> *(*uint64)(unsafe.Pointer(uintptr(pdp0))) = uint64(pd0) |
PAGEAVAIL | PAGEWRITE
14:52 < aiju> my ass
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15:05 < aiju> frame.go:132: internal compiler error: agen: not tptr: uint64
15:05 < aiju> i accidentally the Go compiler
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15:09 < aiju> uint64(uintptr(unsafe.Pointer(&tmppt)))
15:09 < aiju> any idea what's wrong with this?
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15:17 < aiju> should i file a bug?
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15:39 < skelterjohn> aiju: if it says internal compile error, definitely
file a bug
15:39 < aiju> http://code.google.com/p/go/issues/detail?id=1417
15:40 < skelterjohn> i get the error too
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15:41 < skelterjohn> interesting - if instead of having the var tmppt, i
just put &[]uint64{}, it compiles
15:41 < aiju> lol
15:41 < skelterjohn> &[512]uint64{} that is
15:42 < skelterjohn> oh well, above my pay grade
15:42 < aiju> i find those casts pretty obnoxious
15:42 < aiju> sure type safety BUT WHY THE FUCK DO I HAVE TO CAST WITH OVER
9000 INTERMEDIATE TYPES?
15:43 < Namegduf> Because you're fucking with unsafe code that could derive
bad pointers
15:43 < Namegduf> :P
15:43 < aiju> well, yeah, it's supposed to be a "systems programming
language"
15:44 < Namegduf> Or result in pointers stored in a way the GC can't
recognise
15:44 < Namegduf> And thus when screwed with and recast back point at
nothing because it got GCed
15:45 < Namegduf> Why should use as a systems programming language have most
of the code doing things which aren't type safe?
15:46 < aiju> computers aren't type safe …
15:47 < aiju> i hope everything gets nicer after i set up the heap
15:47 < Namegduf> Type safety is not a property of a computer, it's a
property of a language or code in that language
15:47 < aiju> yeah
15:48 < aiju> i'd be happy if i could work without unsafe, but i simply
can't
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15:48 < taruti> Is there a way to read a file to a string without
intermediate copies?
15:49 < skelterjohn> do you have a max on the size of the file?
15:49 < skelterjohn> read it into a [theRightLength]byte
15:49 < Namegduf> That won't do it.
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15:49 < Namegduf> Converting a []byte to a string results in a copy
15:50 < skelterjohn> then i was going to say "and use that []byte"
15:50 < skelterjohn> because you can't read anything directly to a string,
and making a string always copies
15:50 < skelterjohn> unless you use unsafe in a way that i don't advice
15:50 < skelterjohn> advise
15:51 < Namegduf> If that's a solution, then ioutil.ReadFile() will return
you a []byte containing the whole thing.
15:51 < taruti> anyone got the unsafe wrapping around?
15:52 < aiju> "wrapping around"?
15:52 < taruti> aiju: reading as strings without copy using unsafe.
15:52 < skelterjohn> taruti: I'm having trouble imagining a case where this
is appropriate
15:52 < aiju> why would you do that?
15:52 < skelterjohn> maybe give us some context?
15:52 < Namegduf> I suspect it'd involve casting the []byte to string
15:52 < Namegduf> In a way.
15:53 < taruti> skelterjohn: need a string for external api.  got a file of
several megabytes.  want to avoid a multimb copy because the types don't match.
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15:53 < Namegduf> Or rather, converting it into a string with the same len
and data pointer.
15:53 < skelterjohn> does a string have the same layout as a slice?
15:53 < Namegduf> No.
15:53 < Namegduf> strings do not have cap.
15:53 < skelterjohn> ah
15:53 < skelterjohn> does the cap come last?  O:-)
15:53 < Namegduf> It might just work if you do a pointer cast if the cap is
the last thing in-haha.
15:53 < Namegduf> I don't know, maybe, but it'd break if the implementation
changed.
15:54 < Namegduf> I think it might.  Still, though.
15:54 < skelterjohn> taruti: maybe use a bytes.Buffer, and call its String()
method
15:55 < Namegduf> I suspect that will do a copy as well
15:55 < taruti> skelterjohn: that does a copy
15:55 < Namegduf> It'd have to, or later changes to the buffer could break
the immutability of strings.
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15:57 < Namegduf> If a []byte is created in the function, never copied, and
cast to a string to return, and never passed to anything else, the compiler could
hypothetically safely assume there's no copies existing
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15:58 < Namegduf> And the only reference to that data is there, and do it
without a copy.
15:58 < Namegduf> But I don't think it does.
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15:59 < Namegduf> It'd be a kinda sensitive optimisation, too.
16:00 < skelterjohn> taruti: if you read in a few MB from disk, and then
copy a few MB in memory, the disk part is most definitely the bottleneck
16:00 < skelterjohn> i think that you should not worry about this copy
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16:19 < im2ee> Are there anyone from Poland?  :)
16:20 < aiju> i am from your former overlord country
16:20 < jumzi> me too!
16:20 < jumzi> (Sweden ruled the world once upon a time)
16:20 < aiju> i am from your all future overlord country
16:21 < Namegduf> Where?
16:21 < im2ee> :)
16:21 < aiju> ^„^ <-- that one
16:21 < im2ee> Funny.  :)
16:22 < im2ee> I don't understand human hatred.  :)
16:24 < jumzi> You don't?  Weird
16:25 < im2ee> I don't..
16:25 < skelterjohn> quite a non sequitur
16:25 < aiju> back to programing^Wprogramming
16:26 < aiju> *progaming
16:26 < aiju> screw it
16:26 < skelterjohn> hah
16:26 < skelterjohn> fail
16:26 < aiju> yeah :(
16:26 < aiju> back to crying why qemu doesn't like my code
16:27 < im2ee> heh.  :)
16:27 < im2ee> Ahh, this is so funny.
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16:28 < aiju> eh any way to force alignment?
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16:29 < Namegduf> No.
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16:30 < im2ee> Yes.  But it's a personal thing for each.  :)
16:31 < im2ee> Peace and Love.  :)
16:31 < im2ee> hah
16:31 < skelterjohn> i think you are high
16:31 < aiju> pml4h := (*SliceHeader)(unsafe.Pointer(&pml4))
16:31 < aiju> pml4h.Data = uintptr(falloc(1))
16:31 < aiju> pml4h.Len = 512
16:31 < skelterjohn> anyone want to test a build tool that i've been working
on?
16:31 < aiju> make() the old-fashioned way
16:31 < skelterjohn> go-gb.googlecode.com
16:31 < Namegduf> You could just cast it to an array
16:31 < Namegduf> Then slice it
16:32 < Namegduf> Well, a pointer to an array.
16:32 < aiju> slicing something uses new()
16:32 < aiju> which is kind of stupid without a heap
16:32 < aiju> or rather suicidal
16:32 < Namegduf> Does it?
16:32 < aiju> yeah
16:32 < aiju> in most cases
16:32 < aiju> i have yet to find a pattern
16:33 < Namegduf> Even with an existing array?
16:33 < aiju> the paging initialization code is full of bureaucracy
16:33 < aiju> yes
16:33 < Namegduf> What gets put on the heap?
16:33 < aiju> the slice
16:33 < aiju> http://p.remotehost.co/pastes/2011-01-15T11:34:05.raw :<
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16:34 < aiju> the whole thing is kind of fragile
16:34 < aiju> e.g.  it relies on falloc choosing pages in the identity
mapped region
16:35 < Namegduf> What is it being used for?
16:35 < aiju> OS
16:35 < aiju> https://code.google.com/p/gofy/
16:35 < Namegduf> Neat.
16:38 < aiju> mappage is going to be REALLY ugly
16:40 < skelterjohn> "GoFY is a new revolutionary radical operating system"
:)
16:41 < Namegduf> Breaking ALL the rules.
16:41 < Namegduf> Every last one.
16:41 < aiju> yeah
16:41 < aiju> rules like "thou shalt not use bubblesort in an operating
system kernel"
16:41 < skelterjohn> bubblesort has its uses
16:41 < skelterjohn> what if you can't move a piece of data more than one
spot at a time?
16:42 < aiju> i used it out of lazyness
16:42 < aiju> n is small anyway
16:42 < aiju> and it's only executed once
16:42 < skelterjohn> i write selectionsort when i'm being lazy
16:42 < skelterjohn> i feel like bubblesort is harder to write
16:45 < aiju> when i'm being lazy i use sort lol
16:46 < aiju> (i can't in this case)
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16:57 < aiju> hm do i get this right that constants without a type specified
have their type guessed depending on the context?
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17:02 < skelterjohn> it's not so much guessed
17:02 < Namegduf> They have their type set when assigned.
17:02 < skelterjohn> but saying "const a = 123; var b int = a" and "var b
int = 123" mean the same thing
17:02 < Namegduf> If an untyped constant is used to set the type of the
thing being assigned to with :=, it does a default.
17:03 < skelterjohn> same way "b := 123" gives b a type of int
17:03 < Namegduf> Yeah.
17:03 < skelterjohn> it's useful to think of consts as pattern substitutions
17:04 < skelterjohn> and "const a int64 = 123; b:=a" as "b:=int64(123)"
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17:18 < aiju> is there any preffered datatype for sizes (like size_t)?
17:18 < Namegduf> int seems commonly used.
17:18 < aiju> bah
17:19 < Namegduf> Remember that Go has explicit casts.
17:19 < aiju> yes
17:19 < Namegduf> It prefers to avoid hundreds of types for no real reason
that're only sustainable by disabling type safety and the point of having them
17:19 < aiju> well, sizes should at least be uintptr then
17:20 < aiju> which seems bad as well … ugh
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18:33 < aiju> hm can i modify range variables in the loop?
18:33 < cbeck> no
18:33 < cbeck> they're copies
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20:46 < aiju> how to get the address of a function?
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20:49 < JBeshir> Use the function's name.
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20:49 < aiju> it won't convert that to unsafe.Pointer
20:49 < JBeshir> Hmm.
20:50 < aiju> TEXT main·funcaddr(SB), $0 PUSHQ 8(SP) RET
20:50 < aiju> seems like i have to do this
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20:52 < aiju> eh it complains about PUSHQ
20:52 -!- Skola [~ik@5352A3FB.cm-6-3c.dynamic.ziggo.nl] has joined #go-nuts
20:52 < aiju> it's wrong anyway
20:55 < skelterjohn> apologies if you already saw this message - got
netsplat
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20:55 < skelterjohn> does anyone know of a simple cgo example?
20:55 < skelterjohn> i tried looking at the runtime and syscall packages,
but they seem like complex cgo examples
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21:00 < skelterjohn> or if anyone has any cgo experience
21:00 < skelterjohn> i'd like to ask some questions
21:00 < Urmel|> go ahead and ask :)
21:01 < skelterjohn> great!  I'm trying to compile a little basic example
21:01 < skelterjohn> i have a file test.c with one function, foo(), which
does printf("Hello, world!\n")
21:01 < skelterjohn> i have a file test.h that just gives the foo prototype
21:02 < skelterjohn> and a file test.go with a main function that calls
C.foo()
21:02 < skelterjohn> and imports "C"
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21:02 < skelterjohn> i do "cgo test.go", and it says error: test.h: No such
file or directory
21:02 < skelterjohn> which is reasonable
21:02 < skelterjohn> i do "cgo -I.  test.go"
21:03 < skelterjohn> and it tells me flag provided but not defined: -I.
21:03 < skelterjohn> and i don't know exactly how to react to that
21:03 < waqas> Do you do this before importing C: //#include "test.h"
21:03 < skelterjohn> oh and i had //#include "test.h"
21:03 < skelterjohn> before C
21:03 < skelterjohn> actually no
21:03 < skelterjohn> i had it in <> instead of ""
21:03 < skelterjohn> and that fixed it, thanks
21:03 < skelterjohn> :)
21:04 < Urmel|> nice
21:04 < skelterjohn> actually, now i'm getting this:
http://pastebin.com/B0qjnJTT
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21:07 < skelterjohn> any insight into what's going wrong there?
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21:11 < Urmel|> hmm
21:11 < Urmel|> what is the code in the .h file?
21:11 < skelterjohn> one line: "void foo()"
21:12 < Urmel|> try making that "extern void foo()"
21:12 < skelterjohn> no change
21:14 < skelterjohn> i tried just doing C.atoi("123") and //#include
<stdlib.h>
21:14 < skelterjohn> that seems to work fine
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21:14 < skelterjohn> or at least, it doesn't complain, and creates many
files
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21:16 < Urmel|> yeah that pretty much means it works
21:16 < Urmel|> it's a weird error you get, i haven't encountered it before
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21:24 < Urmel|> skelterjohn, i created a test similar to yours
21:24 < Urmel|> and it works
21:24 < Urmel|> maybe something is wrong with your makefile?
21:27 < Urmel|> my test: http://pastebin.com/t2LmgENF
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21:30 < waqas> How hard would it be to export symbols from the cgo+gcc
generated binary?
21:31 < waqas> i.e., create a dynamic library
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