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问题 Im trying to install OpenCV to work with Visual Studio. I'm using the 2012Pro version but I think it should be the same as vs10. I was following this tutorial: http://docs.opencv.org/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#windows-visual-studio-how-to I have A Solution with only one Project And with only one file. For testing purposes I used the same code as in the tutorial. // Video Image PSNR and SSIM #include <iostream> // for standard I/O

问题 I upgraded a system from 10.8 to 10.9 and correspondingly for xcode from 5.0 to 5.0.1. I'm rewarded when I try to run a part of my build that combines multiple .a files into a single, larger, shared lib: Undefined symbols for architecture x86_64: "__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm", referenced from: __ZN2bt3fst12FstLookupSet14loadFromStringERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEESA_ in libbtfst.a(bt_fst_factory.o)

问题 I upgraded a system from 10.8 to 10.9 and correspondingly for xcode from 5.0 to 5.0.1. I'm rewarded when I try to run a part of my build that combines multiple .a files into a single, larger, shared lib: Undefined symbols for architecture x86_64: "__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm", referenced from: __ZN2bt3fst12FstLookupSet14loadFromStringERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEESA_ in libbtfst.a(bt_fst_factory.o)

问题 My question seems to be similar to this question however in my case the shared variable is in a static library and also the advice from this question didn't help me: Sharing global data between a shared library and main. Along the way I saw the issues from this question but no final solution either: OS X linker unable to find symbols from a C file which only contains variables. I am trying to make my main process and a dynamic library that it dlopen 's to share the global variable SHARED

问题 My question seems to be similar to this question however in my case the shared variable is in a static library and also the advice from this question didn't help me: Sharing global data between a shared library and main. Along the way I saw the issues from this question but no final solution either: OS X linker unable to find symbols from a C file which only contains variables. I am trying to make my main process and a dynamic library that it dlopen 's to share the global variable SHARED

问题 How to I find the filename of a library via the library name? In otherwords, when I use "-lc", I know it is /lib/libc.so.6 (or something similar.) I want to be able to type some command where "-lc" is the input and "/lib/libc.so.6" is the output. To extend this idea futher, I wanted to specify my own search path so I can use this library resolver for different toolchains... Any help would be awesome, Thanks Chenz 回答1: If you want to find out where a given GCC will find libc.a or libc.so, do

问题 I'm trying to compile this program, as referenced in Beej's Guide to Network Programming on page 19. #include <stdio.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> int main() { int status; struct addrinfo hints; struct addrinfo *servinfo; /* Will point to the results */ memset(&hints, 0, sizeof hints); /* Make sure the struct is empty */ hints.ai_family = AF_UNSPEC; /* Don't care IPv4 or IPv6 */ hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; if ((status =

问题 What I do When writing shared libraries for Linux, I tend to pay attention to relocations, symbol visibility, GOT/PLT etc. When applicable, I am trying to avoid calling PLT stubs when functions from the same library call each other. For example, let's say a shared object provides two public functions - foo() and bar() (either of those can be called by user). The bar() function, however, also calls foo() . So what I do in this case is this: Define _foo() and _bar() functions that have private

问题 I'm using MinGW to build my application on Windows. When compiling and linking, the option "-mwindows" is put in command line to have Win32 API functions. To be more specific: when calling GCC of MinGW without "-mwindows" like this: c:\>g++ -c main.cpp c:\>g++ -o main.exe main.o The 'main.exe' after the 2 command lines above will run with a console, and Win32 API functions won't be usable. When calling GCC of MinGW with "-mwindows" like this: c:\>g++ -c main.cpp c:\>g++ -o main.exe main.o

问题 i want to know how i can use a static library in C++ which i created, first the lib: // header: foo.h int foo(int a); . // code: foo.cpp #include foo.h int foo(int a) { return a+1; } then i compile the library first: g++ foo.cpp ar rc libfoo.a foo.o now i want to use these library in some file like: // prog.cpp #include "foo.h" int main() { int i = foo(2); return i; } how must i compile these now? i made: g++ -L. -lfoo prog.cpp but get an error because the function foo would not be found 回答1: