CMake基础第5节安装项目

转载

mob604756fe7577 2021-07-28 10:39:00

文章标签 二进制文件 #include 共享库源文件 c++ 文章分类 代码人生

介绍

此示例说明如何生成make install目标以在系统上安装文件和二进制文件。这基于前面的共享库示例。

本教程中的文件如下：

$ tree
.
├── cmake-examples.conf
├── CMakeLists.txt
├── include
│   └── installing
│       └── Hello.h
├── README.adoc
└── src
    ├── Hello.cpp
    └── main.cpp

[CMakeLists.txt] - 包含你希望运行的 CMake 命令

cmake_minimum_required(VERSION 3.5)

project(cmake_examples_install)

############################################################
# Create a library
############################################################

#Generate the shared library from the library sources
add_library(cmake_examples_inst SHARED
    src/Hello.cpp
)

target_include_directories(cmake_examples_inst
    PUBLIC 
        ${PROJECT_SOURCE_DIR}/include
)

############################################################
# Create an executable
############################################################

# Add an executable with the above sources
add_executable(cmake_examples_inst_bin
    src/main.cpp
)

# link the new hello_library target with the hello_binary target
target_link_libraries( cmake_examples_inst_bin
    PRIVATE 
        cmake_examples_inst
)

############################################################
# Install
############################################################

# Binaries
install (TARGETS cmake_examples_inst_bin
    DESTINATION bin)

# Library
# Note: may not work on windows
install (TARGETS cmake_examples_inst
    LIBRARY DESTINATION lib)

# Header files
install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/ 
    DESTINATION include)

# Config
install (FILES cmake-examples.conf
    DESTINATION etc)

[cmake-examples.conf] - 示例配置文件

# Sample configuration file that could be installed

[include/installing/Hello.h] - 要包含的标题文件

#ifndef __HELLO_H__
#define __HELLO_H__

class Hello
{
public:
    void print();
};

#endif

[src/Hello.cpp] - 要编译的源文件

#include <iostream>

#include "installing/Hello.h"

void Hello::print()
{
    std::cout << "Hello Install!" << std::endl;
}

[src/main.cpp] - 主源文件

#include "installing/Hello.h"

int main(int argc, char *argv[])
{
    Hello hi;
    hi.print();
    return 0;
}

概念

安装

CMake提供了添加make install目标的功能，以允许用户安装二进制文件、库和其他文件。基本安装位置由变量CMAKE_INSTALL_PREFIX控制，该变量可以使用ccmake或通过使用cmake .. -DCMAKE_INSTALL_PREFIX=/install/location调用cmake来设置。

安装的文件由install()函数控制。

install (TARGETS cmake_examples_inst_bin
    DESTINATION bin)

将目标cmake_examples_inst_bin生成的二进制文件安装到目标目录${CMAKE_INSTALL_PREFIX}/bin中。

install (TARGETS cmake_examples_inst
    LIBRARY DESTINATION lib)

将目标cmake_examples_inst生成的共享库安装到目标目录${CMAKE_INSTALL_PREFIX}/lib中。

    install (TARGETS cmake_examples_inst
        LIBRARY DESTINATION lib
        RUNTIME DESTINATION bin)

install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/
    DESTINATION include)

将针对cmake_examples_inst库进行开发的头文件安装到${CMAKE_INSTALL_PREFIX}/include目录中。

install (FILES cmake-examples.conf
    DESTINATION etc)

将配置文件安装到目标${CMAKE_INSTALL_PREFIX}/etc。

在运行make install之后，CMake会生成一个install_mark.txt文件，其中包含所有已安装文件的详细信息。

构建示例

$ mkdir build

$ cd build/

$ cmake ..
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/matrim/workspace/cmake-examples/01-basic/E-installing/build

$ make
Scanning dependencies of target cmake_examples_inst
[ 50%] Building CXX object CMakeFiles/cmake_examples_inst.dir/src/Hello.cpp.o
Linking CXX shared library libcmake_examples_inst.so
[ 50%] Built target cmake_examples_inst
Scanning dependencies of target cmake_examples_inst_bin
[100%] Building CXX object CMakeFiles/cmake_examples_inst_bin.dir/src/main.cpp.o
Linking CXX executable cmake_examples_inst_bin
[100%] Built target cmake_examples_inst_bin

$ sudo make install
[sudo] password for matrim:
[ 50%] Built target cmake_examples_inst
[100%] Built target cmake_examples_inst_bin
Install the project...
-- Install configuration: ""
-- Installing: /usr/local/bin/cmake_examples_inst_bin
-- Removed runtime path from "/usr/local/bin/cmake_examples_inst_bin"
-- Installing: /usr/local/lib/libcmake_examples_inst.so
-- Installing: /usr/local/etc/cmake-examples.conf

$ cat install_manifest.txt
/usr/local/bin/cmake_examples_inst_bin
/usr/local/lib/libcmake_examples_inst.so
/usr/local/etc/cmake-examples.conf

$ ls /usr/local/bin/
cmake_examples_inst_bin

$ ls /usr/local/lib
libcmake_examples_inst.so

$ ls /usr/local/etc/
cmake-examples.conf

$ LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib cmake_examples_inst_bin
Hello Install!

注意事项

覆盖默认安装位置

如前所述，默认安装位置是从CMAKE_INSTALL_PERFIX设置的，默认为/usr/local/

如果你想为所有用户更改这个默认位置，可以在添加任何二进制文件或库之前将以下代码添加到你的顶端CMakeLists.txt中。

if( CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT )
  message(STATUS "Setting default CMAKE_INSTALL_PREFIX path to ${CMAKE_BINARY_DIR}/install")
  set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/install" CACHE STRING "The path to use for make install" FORCE)
endif()

此示例将默认安装位置设置为你的构建目录下。

目标文件夹

如果你希望通过进行安装来确认是否包含所有文件，则make install目标支持DESTDIR参数。

make install DESTDIR=/tmp/stage

这将为你的所有安装文件创建安装路径${DESTDIR}/${CMAKE_INSTALL_PREFIX}。在此示例中，它将在路径/tmp/stage/usr/local下安装所有文件

$ tree /tmp/stage
/tmp/stage
└── usr
    └── local
        ├── bin
        │   └── cmake_examples_inst_bin
        ├── etc
        │   └── cmake-examples.conf
        └── lib
            └── libcmake_examples_inst.so