dynamic-linking

问题 Over the months I've written some nice generic enough functionality that I want to build as a library and link dynamically against rather than importing 50-odd header/source files. The project is maintained in Xcode and Dev-C++ (I do understand that I might have to go command line to do what I want) and have to link against OpenGL and SDL (dynamically in SDL's case). Target platforms are Windows and OS X. What am I looking at at all? What will be the entry point of my library if it needs one?

问题 I have a library for which I have created a python wrapper using SWIG. The library itself accepts user provided functions which are in an .so file that is dynamically linked. At the moment I'm dealing with one that I have created myself and have managed to get the dynamic linking working... in C++. When I attempt to run it in python I get undefined symbol errors. These symbols are ones that are not present in the provided .so file but are present in the main program (essentially they are the

问题 With reference to the following code test_linker.cpp int main() { srand(time(0)); for (int i = 0; i < 10; ++i) { cout << rand() % 10 << endl; } return 0; } urandom.cpp #include <iostream> using std::cout; using std::endl; #include <dlfcn.h> int rand() throw() { // get the original rand() function static auto original_rand = (decltype(&rand)) dlsym(RTLD_NEXT,"rand"); cout << "Call made to rand()" << endl; return original_rand(); } When I try to compile the code with the following command g++

问题 I want to run a Qt 5 based application usind dynamic libraries on Linux. In summary, a script will copy the executable and other relevant files, including all required .so inside a lib folder, to the desired destination and a script calling gksudo will work as caller to the app. Till now everything works fine till I call the executable script: the app doesn't run. When I ask to run with sudo , it tells me that a library (Qt5SerialPort...) is missing. Running ldd over the actual executable I

问题 I created a C++ library project in Qt creator. After building the project I have the libMylib.so, .so.1, .so.1.0, .so.1.0.0, Makefile and mylib.o files. I added the library headers to my other project and added the path to my .pro file like this: LIBS += "/home/peter/Workspace/build-Libtester-Desktop-Release/libMyLib.so" When building the application I don't get no such file error, but when running it I get this: /home/peter/Workspace/build-Libtester-Desktop-Debug/Libtester: error while

问题 I have a simple mex function, which calls another C++ function from a library. I compile the source with mex -cxx mymexfunction.cpp -I/some/include -L/some/lib -lmylib The mylib library is dynamic (.so) and is linked itself against some other libraries (boost, OpenCV and some more). The problem I am having is that once I have called the function mymexfunction once, it will not get updated when I recompile the source code. I have tried clear clear all clear mex clear functions clear fun(

问题 I have a simple mex function, which calls another C++ function from a library. I compile the source with mex -cxx mymexfunction.cpp -I/some/include -L/some/lib -lmylib The mylib library is dynamic (.so) and is linked itself against some other libraries (boost, OpenCV and some more). The problem I am having is that once I have called the function mymexfunction once, it will not get updated when I recompile the source code. I have tried clear clear all clear mex clear functions clear fun(

问题 I know that the dynamic linker uses mmap() to load libraries. I guess it is the kernel who loads both the executable and its .interp reter into the same address space, but how does it determine where? I noticed that ld.so 's load address with ASLR disabled is 0x555555554000 (on x86_64) — where does this address come from? I tried following do_execve() 's code path, but it is too ramified for me not to be confused as hell. 回答1: Read more about ELF, in particular elf(5), and about the execve(2)

问题 I want use function 'dlopen()' to invoke a dynamic library on iOS platform, is the function 'dlopen()' private API? 回答1: I've had success using dlopen on iOS for years. In my use case, I use dlopen to load public system frameworks on demand instead of having them loaded on app launch. Works great! [EDIT] - as of iOS 8, extensions and shared frameworks are prohibited from using dlopen , however the application itself can still use dlopen (and is now documented as being supported for not only

问题 I want use function 'dlopen()' to invoke a dynamic library on iOS platform, is the function 'dlopen()' private API? 回答1: I've had success using dlopen on iOS for years. In my use case, I use dlopen to load public system frameworks on demand instead of having them loaded on app launch. Works great! [EDIT] - as of iOS 8, extensions and shared frameworks are prohibited from using dlopen , however the application itself can still use dlopen (and is now documented as being supported for not only