All You Need for CMake系列04——Shared Library
准备代码
代码结构如下:
.
├── CMakeLists.txt
├── include
│ └── shared
│ └── Hello.h
└── src
├── Hello.cpp
└── main.cpp
这是一个经典结构,moveit里面单独的包都是用这种方式写的。
Hello.h
里内容如下:
#ifndef __HELLO_H__
#define __HELLO_H__
class Hello
{
public:
void print();
};
#endif
Hello.cpp
里内容如下:
#include <iostream>
#include "shared/Hello.h"
void Hello::print()
{
std::cout << "Hello Shared Library!" << std::endl;
}
main.cpp
#include "shared/Hello.h"
int main(int argc, char *argv[])
{
Hello hi;
hi.print();
return 0;
}
CMakeLists.txt
cmake_minimum_required(VERSION 3.5)
project(hello_library)
############################################################
# Create a library
############################################################
#Generate the shared library from the library sources
add_library(hello_library SHARED
src/Hello.cpp
)
add_library(hello::library ALIAS hello_library)
target_include_directories(hello_library
PUBLIC
${PROJECT_SOURCE_DIR}/include
)
############################################################
# Create an executable
############################################################
# Add an executable with the above sources
add_executable(hello_binary
src/main.cpp
)
# link the new hello_library target with the hello_binary target
target_link_libraries( hello_binary
PRIVATE
hello::library
)
要点
- 在本教程中演示了如何在CMakeLists.txt中添加对动态lib的支持,在创建library的时候,只用把关键词STATIC替换成SHARED。那句
add_library(hello::library ALIAS hello_library)
只是一个添加别名的作用,是说让它可以用这个名字被link上(下面的link就是这么操作的) - 当然如果不用别名的话,和STATIC的lib比起来就没有多少区别了
- 动态lib的输出是.so文件
编译流程
mkdir build
cd build
cmake ..
make