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• Undefined reference to vtable

  - by RyanG

  So, I'm getting the infamously horrible "undefined reference to 'vtable..." error for the following code (The class in question is CGameModule.) and I cannot for the life of me understand what the problem is. At first, I thought it was related to forgetting to give a virtual function a body, but as far as I understand, everything is all here. The…

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• objdump -S - source code listing

  - by anon

  How does objdump manage to display source code? Is there a reference to the source file in the binary? I tried running strings on the binary and couldn't find any reference to the source file listed... Thanks.

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• How to build libpthread.so from source code?

  - by Tristan Su

  I need a non-stripped version of libpthread.so for debugging. How can I compile it from source code? Host is Linux 2.6.

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• are runtime linking library globals shared among plugins loaded with dlopen?

  - by conejoroy

  I've a C++ program that links at runtime with, lets say, mylib.so. then, the same program uses dlopen()/dlsym() to load a function from myplugin.so, dynamic library that in turn has dependencies to mylib.so. My question is: will the program AND the function in the plugin access the same globals defined in mydlib.so in the same memory area…

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• How do you compile without linking in Automake?

  - by MDH

  I am new to Automake and I am attempting to compile without linking. My goal is to generate a simple Makefile as shown below using Automake. CFLAG = -Wall build: Thread.o Thread.o: Thread.cc Thread.h g++ $(CFLAG) -c Thread.cc clean: rm -f *.o My attempt so far has brought me to the following…

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• Where is the bottleneck in this code?

  - by Mikhail

  I have the following tight loop that makes up the serial bottle neck of my code. Ideally I would parallelize the function that calls this but that is not possible. //n is about 60 for (int k = 0;k < n;k++) { double fone = z[k*n+i+1]; double fzer = z[k*n+i]; z[k*n+i+1]= s*fzer+c*fone; z[k*n+i] = c*fzer-s*fone;…

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• converting char array into one int

  - by user1762517

  I can't use atoi, need to do it digit by digit.. How do I save it in a int.. given a char* temp put it all in one int.. #include <stdio.h> #include <string.h> #include <stdlib.h> #include <math.h> int main () { char* temp = "798654564654564654"; int i = 0; for (i = 0; i < strlen(temp);…

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• What does !!(x) mean in C (esp. the Linux kernel)?

  - by Willi Ballenthin

  I've been reading through the Linux kernel (specifically, 2.6.11). I came across the following definition: #define unlikely(x) __builtin_expect(!!(x), 0) (from linux-2.6.11/include/linux/compiler.h:61 lxr link) What does !! accomplish? Why not just use (x)?

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• Strange behaviour with fputs and a loop.

  - by Jonathan

  When running the following code I get no output but I cannot work out why. # include <stdio.h> int main() { fputs("hello", stdout); while (1); return 0; } Without the while loop it works perfectly but as soon as I add it in I get no output. Surely it should output before starting the loop? Is it just…

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• Are there any was to link my program with Wine-compiled part?

  - by seas

  I am trying to use windows dll functionality in Linux. My current solution is a compilation of a separate wine application, that uses dll and transfer requests/responses between dll and main application over IPC. This works, but is a real overhead comparing to a simple dll calls. I see that wine-compiled program usually is…

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• C warning implicit declaration of function 'exit'

  - by ambika

  This is my warning. implicit declaration of function 'exit' How i can remove it.

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• How do I get an Iterator over a vector of objects from a Template?

  - by nieldw

  I'm busy implementing a Graph ADT in C++. I have templates for the Edges and the Vertices. At each Vertex I have a vector containing pointers to the Edges that are incident to it. Now I'm trying to get an iterator over those edges. These are the lines of code: vector<Edge<edgeDecor, vertexDecor, dir>*> edges =…

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• reverse a linked list?

  - by sil3nt

  Hi there, Im trying to reverse the order of the following linked list, I've done so, But the reversed list does not seem to print out. Where have I gone wrong? //reverse the linked list #include <iostream> using namespace std; struct node{ int number; node *next; }; node *A; …

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• Can this code cause a memory leak (Arduino)

  - by tbraun89

  I have a arduino project and I created this struct: struct Project { boolean status; String name; struct Project* nextProject; }; In my application I parse some data and create Project objects. To have them in a list there is a pointer to the nextProject in each Project object expect the last.…

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• Illegal Instruction When Programming C++ on Linux

  - by remagen

  Heyo, My program, which does exactly the same thing every time it runs (moves a point sprite into the distance) will randomly fail with the text on the terminal 'Illegal Instruction'. My googling has found people encountering this when writing assembly which makes sense because assembly throws those kinds of errors.…

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• Are there any way to link my program with Wine-compiled part?

  - by seas

  I am trying to use windows dll functionality in Linux. My current solution is a compilation of a separate wine application, that uses dll and transfer requests/responses between dll and main application over IPC. This works, but is a real overhead comparing to a simple dll calls. I see that wine-compiled program…

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• How do I install every libs in Devel group of Cygwin?

  - by Thomas

  Is there a way to install every bin in a group of softwares (like devel)? Thank you.

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• Generating code at compile-time using scripts

  - by Manux

  Hello, I would ideally like to be able to add (very repetitive) C/C++ code to my actual code, but at compile time, code which would come from say, the stdout of a python script, the same way one does with macros. For example, let's say I want to have functions that depend on the public attributes of a given…

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• Objective-C++ visibility question

  - by John Smith

  I have linked a library with my program. It works fine. The only problem is that there visibility errors/warnings (thousands of them). They are all of the form: newlib::method() has different visibility (default) in newlib.a and (hidden) in AppDelegate.o It is always with AppDelegate.o. I have tried to…

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• could not read symbols: Archive has no index; run ranlib to add one

  - by indu

  i tried making library with ar -r -c -s libtestlib.a *.o as given in this tutorial http://matrixprogramming.com/Tools/CompileLink.html But on linking with library following error comes g++ -o uni2asc uni2asc.o -L../Modules -ltestlib ../Modules/libtestlib.a: could not read symbols: Archive has no…

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• Ignoring characters in a file while parsing

  - by sfactor

  i need to parse through a text file and process the data. the valid data is usually denoted by either a timestamp with TS followed by 10 numbers (TS1040501134) or values with a alpabet followed by nine numbers (A098098098)...so it will be like…

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• Is it possible to create a null function that will not produce warnings?

  - by bbazso

  I have a logger in a c++ application that uses defines as follows: #define FINEST(...) Logger::Log(FINEST, _FILE, __LINE, __func, __VA_ARGS_) However what I would like to do is to be able to switch off these logs since they have a serious…

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• Cross compile windows 64 bit .exe from linux

  - by Hannes de Jager

  I know that if I want to compile a 32 bit .exe for windows on Linux I can just install and use the mingw32 package (e.g. apt-get install mingw32) on linux. What if I want to compile a windows .exe that is 64 bit? Is there tools or a method…

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• Xcode 3.2 not recompiling changed files

  - by Jason

  I've been programming a new iPhone application and everything has been chugging along fine, until this afternoon when I noticed that any changes I was making were not being reflected in the actual app! Even code that throws errors isn't…

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• Working with wchar in C

  - by Richard Mar.

  I have this code: #include <stdio.h> #include <wchar.h> int main() { wchar_t *foo = L"ðh"; wprintf(L"[%ls]\n", foo); return 0; } And when I compile it, it gives me the implicit declaration of function ‘wprintf’…

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