我正在尝试编译一个在C中使用共享库(也是由我开发)的示例程序,其名称为libtestlib.so.
错误
我编译了共享库没有问题,但是当我尝试编译使用此库的可执行文件时,我有以下错误:iface / libtestlib.so:未定义引用’ALIB :: function()’
我做了什么
我做了以下事情:
C库($project_dir / lib1中的文件):
// HEADER
#ifndef ALIB_H
#define ALIB_H
namespace ALIB{
int function();
}
#endif
-------------------------------------------
// SOURCE
#include "alib.h"
using namespace ALIB;
int ALIB::function(){
return 101;
}
C库的C接口($project_dir / iface中的文件)
// HEADER
#ifndef IFACE_H
#define IFACE_H
#include "alib.h"
extern "C"{
int IFACE_function();
}
#endif
--------------------------------
// SOURCE
#include "iface.h"
int IFACE_function(){
return ALIB::function();
}
--------------------------------------------------------
// CMakeLists used to build the library:
cmake_minimum_required(VERSION 2.8)
PROJECT( testlib )
include_directories( ../lib1 )
add_library( testlib SHARED iface.cpp )
使用该库的可执行文件($project_dir / main中的文件):
// SOURCE
#include "iface.h"
#include <iostream>
using namespace std;
int main(){
cout << IFACE_function() << endl;
}
-------------------------------------
// CMakeLists used to build the executable (file in `$project_dir`):
cmake_minimum_required(VERSION 2.8)
PROJECT( testlib )
find_library( LIB NAMES testlib PATHS ./iface )
include_directories( ./lib1 ./iface )
add_executable( testlib ./main/main.cpp )
target_link_libraries( testlib ${LIB} )
生成的文件
$PROJECT_DIR:
全部由cmake生成. (CmakeLists.txt,CMakeCache,cmake_install.cmake,MakeFile)
$PROJECT_DIR / LIB1:
alib.cpp和alib.h
$PROJECT_DIR / IFACE:
iface.cpp,iface.h,libtestlib.so和所有由cmake生成的.
$PROJECT_DIR /主:
main.cpp中.
作为树:
$project_dir
├── CMakeCache.txt
├── CMakeFiles
│ ├── ...
├── cmake_install.cmake
├── CMakeLists.txt
├── CMakeLists.txt~
├── iface
│ ├── CMakeCache.txt
│ ├── CMakeFiles
│ │ ├── ...
│ ├── cmake_install.cmake
│ ├── CMakeLists.txt
│ ├── CMakeLists.txt~
│ ├── iface.cpp
│ ├── iface.h
│ ├── libtestlib.so
│ └── Makefile
├── lib1
│ ├── alib.cpp
│ └── alib.h
├── main
│ └── main.cpp
└── Makefile
最佳答案 感谢袁的评论,我发现了这个问题.我需要将alib.cpp文件添加到CMakeLists.txt,这样:
// CMakeLists used to build the library:
cmake_minimum_required(VERSION 2.8)
PROJECT( testlib )
include_directories( ../lib1 )
add_library( testlib SHARED iface.cpp ../lib1/alib.cpp )