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• Suppress Xcode warning? 'weak_import' attribute ignored

  - by MT

  Hi, I've got quite a large Xcode project that since an Xcode upgrade is giving me loads of "'weak_import' attribute ignored" warnings, they are coming from WebKit, and a bit of research suggests it's a compiler bug. Is there anyway to suppress them, I'm getting thousands, making the 'real' warnings impossible to find. Cheers MT

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• where to use a pyc file?

  - by sia

  i want to know what is a pyc file(python bytecode) i want to know all details, i want to know about the compiler, is it a replacement for exe? does it need to be run by python? is it as portable as .py file is? where sould i use this? tnx

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• == Operator and operands

  - by rahul

  I want to check whether a value is equal to 1. Is there any difference in the following lines of code Evaluated value == 1 1 == evaluated value in terms of the compiler execution

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• Is using If, ElseIf, ElseIf better than using If, If, If?

  - by Jordan S

  Is there really any difference between using If(this) { } Else If(that) { } Else { } or using, If(this) { } If(that) { } Else { } ? Does one execute any faster? Does the compiler or architecture make any difference?

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• How does objective-c know what is going to be returned by an anonymous object?

  - by Jeffrey Aylesworth

  - (void) doSomething: (id)with { int a; a = [with doSomething]; } How does the compiler know what type [with doSomething] is going to return? Does it assume an int, since that's what I'm assigning to?

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• OK Programming language from USB stick with no installation

  - by tovare

  I'm looking for a compiler or interpreter for a language with basic math support and File IO which can be executed directly from a memorystick in either Linux or Windows. Built in functionality for basic datastructures and sorting/searching would be a plus. (I've read about movable python, but it only supports windows) Thank you

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• In general, how to convert ilasm syntax into Reflection.Emit calls?

  - by Qwertie

  I am writing a special-purpose mini-compiler and I often view disassembled CIL to figure out how to do things. But it's often not obvious how to translate the disassembled code to Reflection.Emit calls. Does a reference manual exist or any other source of information for doing this translation?

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• C++ Map of Vector of Structs?

  - by garsh0p

  So here's a snippet of my code: struct dv_nexthop_cost_pair { unsigned short nexthop; unsigned int cost; }; map<unsigned short, vector<struct dv_nexthop_cost_pair> > dv; I'm getting the following compiler error: error: ISO C++ forbids declaration of `map' with no type What's the proper way to declare this?

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• Dictionary object syntax?

  - by posfan12

  I'm having trouble figuring out the syntax for a JScript .NET dictionary object. I have tried private var myDictionary: Dictionary<string><string>; but the compiler complains that it's missing a semicolon and that the Dictionary object is not declared. I know JScript does have a native dictionary-like object format, but I'm not sure if there are disadvantages to using it instead of the .NET-specific construct. I.e., what if someone wants to extend my script using another .NET language?

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• How to stop protocols from generating warnings?

  - by user314684

  Hi, if I have a protocal defined, then it always generate a lot of warnings when compile. like @property (retain) id <SomeProc> value then in the code: [value class]; ... [value release] the compiler always complain it "may not have class or release defined". Is there a way to fix this?

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• how to define a structural type that refers to itself?

  - by IttayD

  I want to create a method sum that I can call on different types, specifically sum(1,2). def sum[A](a1: A, a2: A) = a1 + a2 This fails because the compiler can't tell if A has a method '+' I tried to define a structural type: type Addable = {def +(a: Addable)} This fails because of an illegal cyclic reference How can I achieve this in a type safe way without requiring A to extend a specific trait?

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• Why does javac complain about not initialized variable?

  - by Marcus

  For this Java code: String var; clazz.doSomething(var); Why does the compiler report this error: Variable 'var' might not have been initialized I thought all variables or references were initialized to null. Why do you need to do: String var = null; ??

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• Qt: Is it possible to use mixins technique?

  - by Eye of Hell

  Hello. Qt library includes advanced meta-programming capabilities using they own preprocessing moc compiler. Does anyone knows, is it possible to create some kind of mix-ins via it? For example, i have a QString and want to add a method to it without sub-classing and changing existing code. Does Qt have such solutions for that?

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• Using custom dll in Qt Application

  - by Donotalo

  First, my compiler and OS: Qt Creator 1.3 Qt 4.6 (32 bit) Windows 7 Ultimate I want to learn how to create and import a dll in Qt. I've created a *.dll file using Qt Creator, called Shared1.dll which contains nothing but an empty class named Shared1. Now I'd like to use Shared1 class in another Qt project. How can I do that? Thanks in advance.

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• Sending data to a web site over HTTP

  - by sfactor

  i have a program that receives data from a wireless device over bluetooth...i now need to do some operations in the data and then send it to the website (web server!!!) as a .csv file...i also need to authenticate the device itself from it hardware address which is also obtained in the program.i am coding this in gcc linux compiler using C...can anyone tell me how do i go about doing this?

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• How Do I Make a PHP Module with the Vala Programming Language?

  - by Volomike

  This new language called Vala, which is said to be C#-like and supposedly easier than C++ or C, compiles down into C on Linux with the GCC compiler. Sounds great. Now I want to use it to make a PHP module so that slow PHP code can be made in Vala and imported into PHP as a function. How do I accomplish this in Vala? Is it even possible?

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• Write to XCode build transcript.

  - by eaigner

  Is there any way to write to the XCode build transcript? What i want to do, is throw a warning if a device is not attached to the computer instead of an assertion failure in my unit test cases (some cases rely on an attached ipod). I thought of something like the standard compiler warnings (only with custom message). Thanks.

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• behaviour of the implicit copy constructor / assignment operator

  - by Tobias Langner

  Hello, I have a question regarding the C++ Standard. Suppose you have a base class with user defined copy constructor and assignment operator. The derived class uses the implicit one generated by the compiler. Does copying / assignment of the derived class call the user defined copy constructor / assignment operator? Or do you need to implement user defined versions that call the base class? Thank you for your help.

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• why does Visual Studio not enforce try-catch-block implementation?

  - by Pedro

  Coming from Eclipse/Java, I noticed that in VisualStudio/C# it is not mandatory to care about Exceptions. While Eclipse forces the user to implement a try-catch-block or to add a throws declaration, this is not the case in Visual Studio. What is the reason Visual Studio doesn't inform about unhandled exceptions? Can I configure Visual Studio to force me to implement try-catch-blocks, or at least add a compiler-warning?

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• Is arithmetic overflow/underflow generally checked in .Net framework methods?

  - by YWE

  For example, let's use the Add method of the ArrayList class. If I am using the default compiler settings in Visual Studio C# project in which arithmetic overflow is not checked, would ArrayList.Add() throw an OverflowException if I added too many items? Would surrounding the method call with checked or unchecked make any difference? BTW, I would write a test program to determine the answer to this question if I had Visual Studio available to me right now.

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• Error in C Program

  - by Manoj

  Hi, while(((long)(1000*ratio*((long)clock()-(long)t0))%100)/1000)<Data_Read_Rate); The above line is generating the following error: "Syntax Error before < token". Why is this error coming up? I use MINGW32 for development(GCC compiler). Thanks...

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• Using Cmake with GNU Make: How can I see the exact commands?

  - by Nils

  I use Cmake with GNU Make and would like to see all commands exactly (for example how the compiler is executed, all the flags etc) GNU make has --debug, but it does not seem to be that helpful are there any other options? Does Cmake provide additional flags in the generated Makefile for debugging purpose?

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• Implemeting 2 interfaces in a class with same method.Which interface method is overridden?

  - by Jothi

  2 Interfaces with same method names and signatures. But implmented by a single class then how the compiler will identify the which method is for which interface.In java.

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• C question: no warning ???

  - by Grv

  main() { printf("Hello World."); } Why does no warning is produced in gcc compiler even though we declare main() with return type 'int'

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• oprofile unable to produce call graph

  - by aaa

  hello I am trying to use oprofile to generate call graph. Compiler is g++, platform is linux x86-64, linker is gfortran C++ code is compiled with -fno- omit-frame-pointer. oprofile is started with --callgraph=25. report I run with --callgraph. the call graph is produced but it's only includes self time, which is not much use what am I missing?

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