linker-errors

问题 I'm mostly new to Visual Studio, so I apologize if this is a basic problem. I have a solution which contains a number of projects. In project A, I have a pre-existing set of files that I added a new class to. Project B uses the functionality coded in that new class in Project A. Project A is built first, and a .lib file is generated, and that .lib file is linked into Project B. However, when I go to create the .lib file for Project B I get a link error, referencing the new functionality in

问题 IN my C++ code I want to make use of a variable "VarX" in a file "B" which is actually modified in another file "A". So I had a look @ the following link & used extern concept. How do I use extern to share variables between source files? error LNK2005: "unsigned int VarX" (?VarX@@3IA) already defined in ***.obj. My scenario is as follows: File1.h extern unsigned int VarX; File2.cpp #include File1.h unsigned int VarX = 101; File3.cpp #include File1.h unsigned int temp = VarX; IMP NOTE: In the

问题 IN my C++ code I want to make use of a variable "VarX" in a file "B" which is actually modified in another file "A". So I had a look @ the following link & used extern concept. How do I use extern to share variables between source files? error LNK2005: "unsigned int VarX" (?VarX@@3IA) already defined in ***.obj. My scenario is as follows: File1.h extern unsigned int VarX; File2.cpp #include File1.h unsigned int VarX = 101; File3.cpp #include File1.h unsigned int temp = VarX; IMP NOTE: In the

问题 http://pingnator.com/help/OS%20X%20Mavericks-2014-06-24-09-00-21.png Ld /Users/STIGPING/Library/Developer/Xcode/DerivedData/FlappyPing-fkdkochwxretapaxarroygfgvhrp/Build/Products/Debug-iphonesimulator/FlappyPing.app/FlappyPing normal i386 cd "/Users/STIGPING/Desktop/Apps/Flappy Bird" export IPHONEOS_DEPLOYMENT_TARGET=7.1 export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:

问题 http://pingnator.com/help/OS%20X%20Mavericks-2014-06-24-09-00-21.png Ld /Users/STIGPING/Library/Developer/Xcode/DerivedData/FlappyPing-fkdkochwxretapaxarroygfgvhrp/Build/Products/Debug-iphonesimulator/FlappyPing.app/FlappyPing normal i386 cd "/Users/STIGPING/Desktop/Apps/Flappy Bird" export IPHONEOS_DEPLOYMENT_TARGET=7.1 export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:

问题 NOTE: I made a DFH_lib.CPP where I included fstream and iomanip. I kept all the template functions in DFH_lib.CPP. Now, if I write the remaining NON-TEMPLATE functions in the MAIN.CPP and include DFH_lib.h only then it successfully runs. I don't understand why... I was making a Data File Handling library using templates. I created two files: DFH_lib.CPP Lib_Test.CPP I made a project and clicked on "Build All" under compile. I encountered the following linker error: file_init(char near*)

问题 NOTE: I made a DFH_lib.CPP where I included fstream and iomanip. I kept all the template functions in DFH_lib.CPP. Now, if I write the remaining NON-TEMPLATE functions in the MAIN.CPP and include DFH_lib.h only then it successfully runs. I don't understand why... I was making a Data File Handling library using templates. I created two files: DFH_lib.CPP Lib_Test.CPP I made a project and clicked on "Build All" under compile. I encountered the following linker error: file_init(char near*)

问题 I have a template singleton class, with a static instance, and a static getInstance() method. However, I'm getting an undefined reference error on the instance from g++ (MinGW); at first, I thought it was linker-order error, but I get the same thing no matter which order I put them in. However, I found that if I explicitly specialize the instance, it does compile (which isn't an acceptable solution). So, here's the code: Singleton.hpp: #ifndef SINGLETON_HPP #define SINGLETON_HPP #include

问题 I am very new to Android, compiling, and linking in general. I do not know which details are important with my problem, so I will just tell you everything. If you see anything strange or incorrect, please let me know. I built the libcrypto.so and libssl.so libraries in the Android-NDK. I wrote native code which uses a function in openssl.so (and openssl.so uses functions in libssl.so). The code compiles, however I receive an "undefined reference" error when linking: ./obj/local/armeabi/objs

问题 I'm using Ubuntu and tried using synaptic to install everything that had the word "GLUT" in it and also SDL and opengl . But still a simple program fails to compile . It shows this : opengl1.cpp:(.text+0xe): undefined reference to `glClear' opengl1.cpp:(.text+0x1a): undefined reference to `glBegin' opengl1.cpp:(.text+0x2e): undefined reference to `glVertex2i' opengl1.cpp:(.text+0x33): undefined reference to `glEnd' opengl1.cpp:(.text+0x38): undefined reference to `glFlush' /tmp/ccnwQeLu.o: In