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undefined symbols error when compiling
by antonitio 25 Aoû '09

25 Aoû '09

hi, i'm trying to compile scheme to c code. here's the hello.scm code: (display "hello world") (newline) compiled ok with gsc: /usr/local/Gambit-C/bin/gsc -c hello.scm however when tried to compile with gcc produced the following error: gcc test.c -I/usr/local/Gambit-C/include -L/usr/local/Gambit-C/lib Undefined symbols: "____gstate", referenced from: ____gstate$non_lazy_ptr in cccK2CZQ.o "_main", referenced from: start in crt1.10.5.o "____G__20_test", referenced from: ____G__20_test$non_lazy_ptr in cccK2CZQ.o "____G_display", referenced from: ____G_display$non_lazy_ptr in cccK2CZQ.o "____G_newline", referenced from: ____G_newline$non_lazy_ptr in cccK2CZQ.o ld: symbol(s) not found collect2: ld returned 1 exit status i'm running on mac os x: uname -srmp; gcc --version Darwin 9.8.0 i386 i386 i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465) did i miss some settings or steps? thanks, antonitio

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Suggestion for a new GCC compiler option
by Bradley Lucier 25 Aoû '09

25 Aoû '09

Dear Marc (and other Gambiteers): I just ran an experiment where I added every combination of 0, 1, and 2 options from the following list to the standard options for Gambit on x86-64 Linux and the development (4.5.0) gcc compiler, and measured the speed of the direct and inverse FFT transforms used in bignum multiplication: (define compiler-options '("-fthread-jumps" "-falign-functions" "-falign-jumps" "-falign-loops" "-falign-labels" "-fcaller-saves" "-fcrossjumping" "-fcse-follow-jumps" "-fcse-skip-blocks" "-fdelete-null-pointer-checks" "-fexpensive-optimizations" "-fgcse" "-fgcse-lm" "-fgcse-sm" "-fgcse-las" "-findirect-inlining" "-foptimize-sibling-calls" "-fpeephole2" "-fregmove" "-freorder-blocks" "-freorder-functions" "-frerun-cse-after-loop" "-fsched-interblock" "-fsched-spec" "-fschedule-insns" ;; "-fschedule-insns2" ; always on ;; "-fstrict-aliasing" ; always off ;; "-fstrict-overflow" ; always off, since -fwrapv is on "-ftree-switch-conversion" "-ftree-pre" "-finline-functions" "-funswitch-loops" "-fpredictive-commoning" "-fgcse-after-reload" "-ftree-vectorize")) What I found was that "-fschedule-insns" significantly improved the code, it ran in 1.264 seconds instead of 1.444 seconds. Note that - fschedule-insns2 is already added to the command line. (For what it's worth, the two options -ftree-pre and -fgcse generated the worst code, when both those options were added the ffts ran in 1.552 seconds.) This options is added at optimization level "-O2" on all architectures with "large" register sets, and I believe that even if it's specified on the command line, it is turned off for i386 (usual Intel x86) code (but this should be checked). So I'm asking that people might run the benchmark suite on various architectures after configuring gambit with, e.g., ./configure CC="gcc -fschedule-insns" --enable-single-host and compare the result to those without adding -fschedule-insns to the command line. I suspect that for both ppc(64) and x86-64 there could be noticeable speedup, but I'm not sure what will happen with arm or some of the other architectures that Gambit might run on. Brad

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syntax-rules error
by antonitio 25 Aoû '09

25 Aoû '09

hi all i try to define the following syntax: (define-syntax when (syntax-rules () ((_ test stm1 stm2 ...) (if test (begin stm1 stm2 ...))))) but getting the following error with the bracket pair after syntax-rules highlighted (in emacs): *** ERROR IN (stdin)(a)2.17 -- Ill-formed expression this occurs on both version 4.4.4 and 4.5.1. i try on chicken scheme and it works fine. this is basic stuff but i can't get around it, have searched on the net but nothing came out. am i missing something? or? thanks antonitio

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Video game written in Gambit
by Marc Feeley 24 Aoû '09

24 Aoû '09

Today Gamerizon has released their game, QuantZ, which is almost entirely written in Scheme using Gambit. Give their trial version a try and check the credits! http://www.gamerizon.com/ http://www.gamerizon.com/gamerizon-news-and-media.html Marc

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Tcp server error?
by David St-Hilaire 24 Aoû '09

24 Aoû '09

Hi all! Can anyone help me pinpointing what is wrong with the follow tcp server code? (define (tcp-server-test) (let ((p (read (open-tcp-server (list port-number: 20000 reuse-address: #t))))) (pp (read p)) (write 'yea! p) (force-output p) (close-port p))) (tcp-server-test) If run this code inside a console and, from another console I run the following client code: (define (tcp-test) (let ((connection (open-tcp-client (list server-address: "192.168.60.239" port-number: 20000)))) (write 'allo!! connection) (force-output connection) (read connection) (close-port connection))) (tcp-test) I always get a "broken pipe" error. Note that the ip address is correct. I tried to replace the server with the good old netcat and it works just fine (i.e. that the client successfully connects to the nc server). Is anything wrong with the server code? Thanks! -- David

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Creating a c-define-type using c++ reference
by Ivan Kelly 24 Aoû '09

24 Aoû '09

Im porting a C++ library to gambit and have numerous functions which take references as parameters or return type. (define QObject-setObjectName (c-lambda (QObject* const_QString&) (void) "arg1->setObjectName(arg2);")) (define QObject-children (c-lambda (QObject*) (const_QList<QObject*>&) "____result = arg1->children();")) My problem is I don't know how to c-define-type the reference types. On the one hand I want them to act as "type", when being passed in as parameters. On the other I want pointer behaviour, so that the whole object isn't copied on return. Has anyone else run into this problem with c++, and how did you solve it? Regards Ivan

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Where to find Black Hole?
by Tomi Neste 24 Aoû '09

24 Aoû '09

Good evening everyone. Is the latest version Black Hole available somewhere? mwaza.dyndns seems to be down and git://github.com/pereckerdal/blackhole-libs.git only has the bundled libs but no Black Hole itself. The "very old copy" linked in wiki gives me a "deserialization error" when trying to (load "build.scm"). -- tomppa

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[ANN] scheme-reports.org
by Marc Feeley 20 Aoû '09

20 Aoû '09

[Apologies if you get duplicates of this message.] This message is being posted to various lists to inform members of the Scheme community on the activities of the Scheme Language Steering Committee which is overseeing the process of Scheme language evolution. A website has been setup to publish various documents pertaining to our activities. The steering committee will be presenting and discussing these documents at the Scheme workshop on August 22. Our hope is that by publishing them now, a more fruitful question period will ensue at the workshop. The website URL is: http://www.scheme-reports.org/ The documents being published today are: 1) The amended Scheme Language Steering Committee charter. 2) The steering committee's position statement on Scheme language evolution. 3) A draft of the working group meta charter, that describes how working groups are run. 4) A draft of the charter for working group 1, which will be involved in the elaboration of a specification for a "small" Scheme language. 5) A draft of the charter for working group 2, which will be involved in the elaboration of a specification for a "large" Scheme language. If you would like to comment on these documents, we urge you to come to the Scheme workshop and/or to send email to the steering committee at this address: sc(a)scheme-reports.org . Will Clinger Marc Feeley Chris Hanson Jonathan Rees Olin Shivers

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How to create small standalone executable with Gambit-C?
by peter lo 18 Aoû '09

18 Aoû '09

Dear all, I am new to Gambit-C. I keep hearing that with Gambit-C, it is easy to create small executable. But when I tried, a simple hello world program takes around 3 MB when compiled as a STANDALONE executable. Is there a way to create small executable which includes only used functions, just like in C, we don't link the whole library into the executable. Thanks. Peter Yahoo!香港提供網上安全攻略，教你如何防範黑客! 請前往 http://hk.promo.yahoo.com/security/ 了解更多!

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Black Hole
by Marcelo Alvim 17 Aoû '09

17 Aoû '09

Hi, I am new to Gambit (and Scheme as a whole), and I'm trying to install Black Hole with no success so far. I've tried following the instructions in http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Black_Hole, but whenever I try to clone http://mwaza.dyndns.org/apps/files/modules.git I get a timeout. If I try git://repo.or.cz/blackhole.git I get an empty repo. Does anyone know if Black Hole is still going and, if so, where to get it? Thanks, Marcelo.

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