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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay

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• Using boost::iostreams to parse a binary file byte by byte

  - by Zsol

  So I would like to parse a binary file and extract some data from it. The problem I am facing with this is that I need to convert a stream of chars to a stream of unsigned chars. Reading the boost documentation, it seems that boost::iostreams::code_converter should be the solution for this, so I tried this: typedef unsigned char uint8_t; typedef boost::iostreams::stream<boost::iostreams::code_converter< boost::iostreams::basic_array_source<uint8_t> >, std::codecvt<uint8_t, char, std::mbstate_t> > array_stream; The idea was to specify a codecvt with InternalType=uint8_t and ExternalType=char. Unfortunately this does not compile. So the question is: how do I convert a stream of chars to a stream of uint8_ts?

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• Replace these OpenGL functions with OpenGL ES?

  - by Constantin

  I search for a possibility to migrate my PC OpenGL application and an iPhone App into one XCode project (for convenience). So if I make chances to these source files I want to apply this for both plattforms and want to be able to compile for both plattforms from one project. How could I accomplish this? Is there a way to do so in XCode 4 or 3.25? Any help would be highly appreciated edit: Okay, I went so far - All in all, it seems to work with XCode 4. My only problems are these openGL/Glut functions, that aren't working on iPhone: glPushAttrib( GL_DEPTH_BUFFER_BIT | GL_LIGHTING_BIT ); glPopAttrib(); glutGet(GLUT_ELAPSED_TIME); glutSwapBuffers(); Any ideas how to fix these issues?

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• i386-mingw32-g++: error trying to exec 'cc1plus': execvp: No such file or directory

  - by Cathy

  If I compile this QT c++ program in SuSE Linux include using namespace std; int main () { cout << "Hello World!"; return 0; When I type i386-mingw32-g++ helloworld.cpp I get the following error i386-mingw32-g++: error trying to exec 'cc1plus': execvp: No such file or directory Is this because MinGW package which i installed contains only gcc in it.. hence i downloaded gcc-g++-3.4.5.rpm package and just copy pasted i386-mingw32-g++ and cc1plus executable along with C++ include files. Pls reply. Thanking You

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• theming sencha touch error: File to import not found or unreadable: sencha-tou ch/default/all

  - by dan

  I just cant find a workarround for this, please help my config.rb in location $PROJECT_HOME/assets/www/theming dir = File.dirname('..Path_to_project_home..\assets\www\theming\config.rb') load File.join(dir, '..', 'lib', 'touch', 'resources', 'themes') sass_path = dir css_path = dir environment = :production output_style = :compressed this is my app.scss: @import 'sencha-touch/default/all'; @include sencha-panel; @include sencha-buttons; @include sencha-toolbar; @include sencha-list; @include sencha-layout; @include sencha-sheet; @include sencha-msgbox; in the console in the directory of the 'sass_path' I run compass compile app.scss but I get the following error: File to import not found or unreadable: sencha-touch/default/all. Please help, cant solve this.

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• How do you do an assignment of a delegate to a delegate in .NET 2.0

  - by Seth Spearman

  Hello... I just go the answer on how to pass a generic delegate as a parameter. Thanks for the help. Now I need to know how to ASSIGN the delegate to another delegate declarartion. Can this be done? Public Class MyClass Public Delegate Function Getter(Of TResult)() As TResult ''#the following code works. Public Shared Sub MyMethod(Of TResult)(ByVal g As Getter(Of TResult)) ''# I want to assign Getter = g ''#how do you do it. End Sub End Class Notice that Getter is now private. How can I ASSIGN Getter = G When I try Getter = g 'I get too few type arguments compile error. When I try Getter(Of TResult) = g 'I get Getter is a type and cannot be used as an expression. How do you do it? Seth

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• Compiling netcat on AIX

  - by A.Rashad

  I have been trying to compile netcat.c on AIX for some time (using the command make aix), but the compiler gives me some weird feedback such as : "netcat.c", line 117.12: 1506-275 (S) Unexpected text 'int' encountered. when checked the file netcat.c at line 117, I would find the line (second line in code below): #ifdef HAVE_BIND extern int h_errno; /* stolen almost wholesale from bsd herror.c */ even if I changed the int into char for the same of testing, save the file and re-run the command I get the same error am I missing something in reading the error code?

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• How are Scala traits compiled into Java bytecode?

  - by Justin Ardini

  I have played around with Scala for a while now, and I know that traits can act as the Scala equivalent of both interfaces and abstract classes. Recently I've been wondering how exactly traits are compiled into Java bytecode. I found some short explanations that stated traits are compiled exactly like Java interfaces when possible, and interfaces with an additional class otherwise. I still don't understand, however, how Scala achieves class linearization, a feature not available in Java. Could anyone explain or provide a good source explains how traits compile to Java bytecode?

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• mingw spitting countless warnings about ignoring "dll import" attribute

  - by hasen j

  I'm using mingw32-make to compile a qt project that uses opengl, it compiles correctly and everything, but it spits countless warning messages of the form: c:/qt3/include/qcolor.h:67: warning: inline function `int qGray(int, int, int)' declared as dllimport: attribute ignored For this particular instance, the function declaration is: Q_EXPORT inline int qGray( int r, int g, int b )// convert R,G,B to gray 0..255 { return (r*11+g*16+b*5)/32; } My question is, why is it spitting all these warning? how can I silence them without silencing other legitimate warnings (i.e. warnings that are related directly to my code and could be potential problems)? More importantly, why is mingw ignoring the dll import attribute in the first place?

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• OpenSSL not listed under PHP modules but shows up in the configure command

  - by Lauren

  PHP 5.2.12 OS X 10.5.8 If I compile PHP from source with the following configure command ./configure --disable-all --with-openssl=shared,/opt/local it succeeds. However, after a make and make install, php -m does not list the openssl module. Based on what I've read, I think it may be due to multiple installs of the openssl library. Installing the latest version of openssl from source and trying to specify the path in the configure command, --with-openssl=/usr/local, always results in the following error: Undefined symbols: "_EVP_CIPHER_CTX_block_size", referenced from: _zif_openssl_seal in openssl.o ld: symbol(s) not found collect2: ld returned 1 exit status make: *** [sapi/cgi/php-cgi] Error 1 I've tried a few different variations on the path with no luck. Based on http://blog.yimingliu.com/2009/02/24/missing-library-symbols-while-compiling-php-528/, I've also tried editing the Makefile so that MH_BUNDLE_FLAGS comes later in the compilation line. After spending a good portion of the day on this issue, I'm at a loss. Any suggestions?

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• Force an unchecked call

  - by François Cassistat

  Hello, Sometimes, when using Java reflection or some special storing operation into Object, you end up with unchecked warnings. I got used to it and when I can't do anything about it, I document why one call is unchecked and why it should be considered as safe. But, for the first time, I've got an error about a unchecked call. This function : public <K,V extends SomeClass & SomeOtherClass<K>> void doSomethingWithSomeMap (Map<K,V> map, V data); I thought that calling it this way : Map someMap = ...; SomeClass someData = ...; doSomethingWithSomeMap(someMap, someData); would give me an unchecked call warning. Jikes does a warning, but javac gives me an error : Error: doSomethingWithSomeMap(java.util.Map,V) in SomeClass cannot be applied to (java.util.Map,SomeClass) Any way to force it to compile with a warning? Thanks.

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• ASP.NET MVC 2.0 RTM cannot work with VWD 2008 Express on a new Windows 7 Pro

  - by silent

  The MVC 2.0 RTM works great on my old Vista computer with VWD 2008 Express, but I just bought a new computer with Windows 7 Pro, I installed VWD 2008 Express SP1 and MVC 2.0 RTM by using Web PI 2.0. but after installation, I found the VWD doesn't have any MVC options, that means I can't either create new MVC projects or compile existing MVC projects. Why? What other steps I need to do to make it work? I'm sure the MVC has been installed properly since my MVC site on the new computer works well (so the IIS side has no problem), just the VWD can't 'realize' that the MVC framework is already installed... (tried to uninstall and install many times, and I also tried to install MVC separately without Web PI, but it just won't work)

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• Test assembly code on a mac

  - by happyCoding25

  Hello, A while back I was following some tutorials an assembly. I was running it all on a windows machine, compiling with NASM and then writing the compiled code to a floppy disk, then reboot and try the code. This process was long and time consuming and sadly was not on a mac. When I found out that Xcode for mac installed NASM I immediately tried to compile some code. The code compiled fine. The issue is testing it. On a mac I have no floppy (not like I want to use one) so Im not sure how to test this. I looked in to Q (kju) and found it would only emulate things on an ISO file. So I guess what Im asking is is it possible to install the compiled code on an ISO file for testing? (Note: the code when compiled forms a .bin file) Thanks for any help

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• How do I get Nant to use the 4.0 compiler to target .Net 3.5

  - by Rory Becker

  Yes I know that sounds a little bit crazy, but I've got .Net 3.5 deployed in the field and I'd like to use the new 4.0 compiler to target it. There are several new syntactic sugar features in the latest versions of Vb.Net and C# which I would like to use,but I am unable (just yet) to enforce a new version of the .Net framework and CLR on my client base. Before the nay sayers jump in with both feet... I have just successfully used Studio 2010 to compile a 3.5 targeted app which used VB.Net auto properties (A new feature in VB.Net 10) so I know the compilers are capable somehow. So back to my question.... How do I convince Nant to use the 4.0 compiler, but to target .Net 3.5 (CLR 2.0) Update: I am using the csc and vbc tasks and not the Solution task. although I'd settle for an answer on how to do this direct with the compilers at this point.

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• MagicLibrary.dll 32bit convert for 64bit

  - by Nullstr1ng

  Hi Guys, I recently received an email about a guy who like to make my software compatible with 64Bit Windows 7 OS. I have 1 single problem though .. I have followed a steps regarding on compiling VS Solution/Project for 64bit. But when I start to to compile the solution for 64bit, this "Crownwood.Magic.Forms" (MagicLibrary.dll) doesn't work anymore. This is the compilation error message "Error 6 The type or namespace name 'Crownwood' could not be found (are you missing a using directive or an assembly reference?)" Please don't tell me I did not referenced the MagicLibrary.dll It's a bit of confusing because the MagicLibrary.dll is already in my reference list. I also remove and add it back. There was this CorFlags.exe but am not sure how to convert it to 64bit. "CorFlags MagicLibrary.dll /32BIT- /Force" did not work.. :( Please help. Thanks in advance - Jayson

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• What does the C compiler error "looks like a function definition, but there is no parameter list;" m

  - by user312309

  #include <iostream> #include <fstream> using namespace std; int main { int num1, num2; ifstream infile; ostream outfile; infile.open("input.dat"); outfile.open("output.dat"); infile >> num 1 >> num 2; outfile << "Sum = " << num1 + num2 << endl; infile.close() outfile.close() return 0; } this is what i did and when i compile it, i got this error that said error C2470: 'main' : looks like a function definition, but there is no parameter list; skipping apperent body please dont hate me :( i am new at this computer science....

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• Linq-to-sql Compiled Query is returning result from different DataContext

  - by Vladimir Kojic

  Compiled query: public static Func<OperationalDataContext, short, Machine> QueryMachineById = CompiledQuery.Compile((OperationalDataContext db, short machineID) => db.Machines.Where(m => m.MachineID == machineID).SingleOrDefault()); It looks like compiled query is caching Machine object and returning the same object even if query is called from new DataContext (I’m disposing DataContext in the service but I’m getting Machine from previous DataContext). I use POCOs and XML mapping. Revised: It looks like compiled query is returning result from new data context and it is not using the one that I passed in compiled-query. Therefore I can not reuse returned object and link it to another object obtained from datacontext thru non compiled queries. I’m using unit of work pattern : // First Call Using(new DataContext) { Machine from DataContext.Table == machine from cached query } // Do some work // Second Call is failing Using(new DataContext) { Machine from DataContext.Table <> machine from cached query }

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• Using SCons as a build engine for distutils

  - by pygabriel

  I have a python package with some C code needed to build an extension (with some non-trivial building needs). I have used SCons as my build system because it's really good and flexible. I'm looking for a way to compile my python extensions with SCons ready to be distributed with distutils. I want that the user simply types setup.py install and get the extension compiled with SCons instead of the default distutils build engine. An idea that comes to mind is to redefine build_ext command in distutils, but I can't find extensive documentation for it. Any suggestion?

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• Reverse Engineer a .pyo python file

  - by Brian

  I have 2 .pyo python files that I can convert to .py source files, but they don't compile perfectly as hinted by decompyle's verify. Therefore looking at the source code, I can tell that config.pyo simply had variables in in an array: ADMIN_USERIDS = [116901, 141, 349244, 39, 1159488] I would like to take the original .pyo and disassembly or whatever I need to do inorder to change one of these IDs. Or.... in model.pyo the source indicates a if (productsDeveloperId != self.getUserId()): All I would want to do is hex edit the != to be a == .....Simple with a windows exe program but I can't find a good python disassembler anywhere. Any suggestions are welcomed...I am new to reading bytecode and new to python as well.

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• XML-RPC with java

  - by Mona

  hi, I'm developing a server in XML-RPC using Java , but when i compile it , i get this error ServeurSomDiff.java:33: cannot find symbol symbol : method addHandler(java.lang.String,java.lang.String) location: class org.apache.xmlrpc.webserver.WebServer server.addHandler("SOMDIFF",new ServeurSomDiff ()); here 's my server : import java.util.Hashtable; import org.apache.xmlrpc.webserver.*; public class ServeurSomDiff { public ServeurSomDiff (){ } public Hashtable sumAndDifference (int x, int y) { Hashtable result = new Hashtable(); result.put("somme", new Integer(x + y)); result.put("difference", new Integer(x - y)); return result; } public static void main (String [] args) { try { WebServer server = new WebServer(8000); server.addHandler("SOMDIFF",new ServeurSomDiff()); server.start(); System.out.println("Serveur lance sur http://localhost:8000/RPC2"); } catch (Exception exception) {System.err.println("JavaServer: " + exception.toString()); } } } any ideas on how to fix this . thanks

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• Import web.go error after using goinstall

  - by Metropolis

  With halfdans advice, I was successfully able to use goinstall github.com/hoisie/web.go without any errors after installing git first. However, now when I try to compile the sample code given, go is not finding the web package. I get the error, main.go:4: can't find import: web On this code package main import ( "web" ) func hello(val string) string { return "hello " + val } func main() { web.Get("/(.*)", hello) web.Run("0.0.0.0:9999") } Is there something special I need to do in order for it to recognize the package? I found the package source at $GOROOT/src/pkg/github.com/hoisie/web.go/web. I tried github.com/hoisie/web.go/web as the import and it still did not like that.

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• How to build a java applet?

  - by Stefano Borini

  Most of the tutorials around explain how to create a java applet: create a .java file with a class, compile it with javac, put the .class somewhere, add a proper tag in the html. However, I'm not able to find anything about the best practices to build and release a complex applet, made of multiple classes and with additional libraries. How is the build/release process for this case ? What is it needed to go from my java project to the final .jar to put on the web ? I'm working with pure Eclipse, no plugins.

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• Cheetah pre-compiled template usage quesion

  - by leo

  For performance reason as suggested here, I am studying how to used the pr-compiled template. I edit hello.tmpl in template directory as #attr title = "This is my Template" \${title} Hello \${who}! then issued cheetah-compile.exe .\hello.tmpl and get the hello.py In another python file runner.py , i have !/usr/bin/env python from Cheetah.Template import Template from template import hello def myMethod(): tmpl = hello.hello(searchList=[{'who' : 'world'}]) results = tmpl.respond() print tmpl if name == 'main': myMethod() But the outcome is ${title} Hello ${who}! Debugging for a while, i found that inside hello.py def respond(self, trans=None): ## CHEETAH: main method generated for this template if (not trans and not self._CHEETAH__isBuffering and not callable(self.transaction)): trans = self.transaction # is None unless self.awake() was called if not trans: trans = DummyTransaction() it looks like the trans is None, so it goes to DummyTransaction, what did I miss here? Any suggestions to how to fix it?

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• Start Codeblocks project from external code

  - by Dnaiel

  I have C++ code that depends on boost and other libraries, and therefore this code has a makefile that invokes boost. I am now trying to start developing this code in codeblocks in linux, so in order to do that I have two basic questions: (1) How can I import the code into codeblocks as a codeblocks new project? (2) How do I invoke the makefile with codeblocks instead of codeblocks trying to compile the code (which it would fail since codeblocks does not know that it needs to invoke boost). Sorry if it's too basic but I am quite new to C++ and codeblocks. Thanks!

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• Scala regex Named Capturing Groups

  - by Brent

  In scala.util.matching.Regex trait MatchData I see that there support for groupnames (Named Capturing Groups) But since Java does not support groupnames until version 7 as I understand it, Scala version 2.8.0.RC4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6. gives me this exception: scala> val pattern = """(?<login>\w+) (?<id>\d+)""".r java.util.regex.PatternSyntaxException: Look-behind group does not have an obvio us maximum length near index 11 (?<login>\w+) (?<id>\d+) ^ at java.util.regex.Pattern.error(Pattern.java:1713) at java.util.regex.Pattern.group0(Pattern.java:2488) at java.util.regex.Pattern.sequence(Pattern.java:1806) at java.util.regex.Pattern.expr(Pattern.java:1752) at java.util.regex.Pattern.compile(Pattern.java:1460) So the question is Named Capturing Groups supported in Scala? If so any examples out there? If not I might look into the Named-Regexp lib from clement.denis.

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