cmake中添加引用动态链接和静态链接库
ADD_EXECUTABLE(a.out ./main.cpp)
TARGET_LINK_LIBRARIES(a.out /usr/lib/libeg.so)
动态库的添加:
link_directories(${PROJECT_SOURCE_DIR}/lib) #添加动态连接库的路径
target_link_libraries(project_name -lmxnet ) #添加libmxnet.so
静态库的添加:
add_library(mxnet STATIC IMPORTED)
set_property(TARGET mxnet PROPERTY IMPORTED_LOCATION /path/to/libmxnet.a)
target_link_libraries(project_name mxnet ) #添加libmxnet.a
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cmake_minimum_required( VERSION 2.8 )
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# 声明一个 cmake 工程
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project(useHello)
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# 设置编译模式
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set( CMAKE_BUILD_TYPE "Debug" )
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# VAR变量代表找到的库全路径,包含库文件名
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include_directories (${useHello_SOURCE_DIR})
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#增加src为link目录w-1
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add_executable(useHello useHello.cpp )
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target_link_libraries( useHello -lhello)#hello_shared=lhello # w-2
#增加src为link目录 link_directories
# 将库文件链接到可执行程序上 target_link_libraries
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# 添加一个可执行程序
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add_executable(useHello useHello.cpp )
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target_link_libraries( useHello hello_shared )# w-1
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target_link_libraries与link_libraries 区别
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target_link_libraries(useHello /home/ubuntu/ch2/useHello/libhello_shared.so)
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# target_link_libraries(useHello "/home/ubuntu/ch2/useHello/libhello_shared.so")
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# link_libraries(useHello "/home/ubuntu/ch2/useHello/libhello_shared.so")#bug
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# link_libraries(useHello /home/ubuntu/ch2/useHello/libhello_shared.so)#bug #undefined reference to `printHello()
路径错误
target_link_libraries 全路径,绝对路径
路径错误提示bug(路径拼写错误) “” "" ‘’英文双引号 或不加引号
#bug #undefined reference to `printHello()
#bug #/usr/bin/ld: cannot find -l“home/ubuntu/ch2/usehello/libhello_shared.so”
In function `main‘:useHello.cpp:6: undefined reference to `printHello()‘
LINK_LIBRARIES (添加需要链接的库文件路径,注意这里是全路径)
List of direct link dependencies.
比如:
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so")
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
也可以写成:
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so" "/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
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TARGET_LINK_LIBRARIES (设置要链接的库文件的名称)
语法:TARGET_LINK_LIBRARIES(targetlibrary1 <debug | optimized> library2 ..)
比如(以下写法(包括备注中的)都可以):
TARGET_LINK_LIBRARIES(myProject hello),连接libhello.so库
TARGET_LINK_LIBRARIES(myProject libhello.a)
TARGET_LINK_LIBRARIES(myProject libhello.so)
再如:
TARGET_LINK_LIBRARIES(myProject libeng.so) #这些库名写法都可以。
TARGET_LINK_LIBRARIES(myProject eng)
TARGET_LINK_LIBRARIES(myProject -leng)
与add_executable相对位置
LINK_LIBRARIES (添加需要链接的库文件路径,注意这里是全路径) 在add_executable前面位置
target_link_libraries 可以在add_executable后面位置
一个简单的示例
一个简单的示例(以下CMakeLists.txt效果相当,在ubuntu 12.04 + g++4.6下测试编译通过):
方式一:
cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
include_directories("/opt/MATLAB/R2012a/extern/include")
#directly link to the libraries.
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so")
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
#equals to below
#LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so" "/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
add_executable(myProject main.cpp)
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link_libraries("/home/ubuntu/ch2/useHello/libhello_shared.so")#前
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# 添加一个可执行程序
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add_executable(useHello useHello.cpp )
方式二:
cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
include_directories("/opt/MATLAB/R2012a/extern/include")
LINK_DIRECTORIES("/opt/MATLAB/R2012a/bin/glnxa64")
add_executable(myProject main.cpp)
target_link_libraries(myProject eng mx)
#equals to below
#target_link_libraries(myProject -leng -lmx)
#target_link_libraries(myProject libeng.so libmx.so)
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add_executable(useHello useHello.cpp )
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target_link_libraries( useHello hello)#后
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link_directories
link_directories, LINK_LIBRARIES, target_link_libraries使用总结
INCLUDE_DIRECTORIES(添加头文件目录)
它相当于g++选项中的-I参数的作用,也相当于环境变量中增加路径到CPLUS_INCLUDE_PATH变量的作用(这里特指c++。c和Java中用法类似)。
比如:
include_directories("/opt/MATLAB/R2012a/extern/include")
export CPLUS_INCLUDE_PATH=CPLUS_INCLUDE_PATH:$MATLAB/extern/include
LINK_DIRECTORIES(添加需要链接的库文件目录)
语法:
link_directories(directory1 directory2 ...)
它相当于g++命令的-L选项的作用,也相当于环境变量中增加LD_LIBRARY_PATH的路径的作用。
比如:
LINK_DIRECTORIES("/opt/MATLAB/R2012a/bin/glnxa64")
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$MATLAB/bin/glnxa64
LINK_LIBRARIES (添加需要链接的库文件路径,注意这里是全路径)
List of direct link dependencies.
比如:
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so")
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
也可以写成:
LINK_LIBRARIES("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so" "/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
TARGET_LINK_LIBRARIES (设置要链接的库文件的名称)
语法:TARGET_LINK_LIBRARIES(targetlibrary1 <debug | optimized> library2 ..)
比如(以下写法(包括备注中的)都可以):
TARGET_LINK_LIBRARIES(myProject hello),连接libhello.so库
TARGET_LINK_LIBRARIES(myProject libhello.a)
TARGET_LINK_LIBRARIES(myProject libhello.so)
再如:
TARGET_LINK_LIBRARIES(myProject libeng.so) #这些库名写法都可以。
TARGET_LINK_LIBRARIES(myProject eng)
TARGET_LINK_LIBRARIES(myProject -leng)
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FIND_PACKAGE
hello ---he hell 不完整 错误提示
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
HELLO_LIB
linked by target "useHello" in directory /home/ubuntu/ch2/useHello
-- Configuring incomplete, errors occurred!
FIND_LIBRARY
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# VAR变量代表找到的库全路径,包含库文件名
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FIND_LIBRARY(HELLO_LIB hello /usr/lib /home/ubuntu/ch2/useHello /usr/local/lib NO_DEFAULT_PATH)
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link_libraries(${HELLO_LIB})
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# 添加一个可执行程序
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add_executable(useHello useHello.cpp )
直接链接库目录路径
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# 链接库目录路径
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link_directories(${PROJECT_SOURCE_DIR})#${PROJECT_SOURCE_DIR}
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# 添加一个可执行程序
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add_executable( useHello useHello.cpp )
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# 将库文件链接到可执行程序上
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target_link_libraries( useHello hello_shared )
find_package
FIND_PACKAGE( <name> [version] [EXACT] [QUIET] [NO_MODULE] [ [ REQUIRED | COMPONENTS ] [ componets... ] ] )
用来调用预定义在 CMAKE_MODULE_PATH 下的 Find<name>.cmake 模块。
也可以自己定义 Find<name>模块,将其放入工程的某个目录中,通过 SET(CMAKE_MODULE_PATH dir)设置查找路径,供工程FIND_PACKAGE使用。
这条命令执行后,
CMake 会到变量 CMAKE_MODULE_PATH 指示的目录中查找文件 Findname.cmake 并执行。
区分FIND_LIBRARY https://blog.csdn.net/KYJL888/article/details/78860077
没有通过 cmake 生成供find_package使用的自定义模块
https://blog.csdn.net/KYJL888/article/details/85113221
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如果想灵活一点,不把库的路径写死,那就类似这样(libeg.so):
FIND_PACKAGE(eg REQUIRED)
IF (EG_FOUND)
INCLUDE_DIRECTORIES(${EG_INCLUDE_DIRS})
SET(DEPLIBS ${DEPLIBS} ${EG_LIBRARIES})
ENDIF ()
# 下面可以有好多个FIND_PACKAGE(...)
ADD_EXECUTABLE(a.out ./main.cpp)
TARGET_LINK_LIBRARIES(a.out ${DEPLIBS})
当然这是需要FindXXX.cmake文件支持的,cmake自带了一些(cmake --help-module-list),没有的话需要自己写
CMake支持大写、小写、混合大小写的命令。
1. 添加头文件目录INCLUDE_DIRECTORIES
语法:
include_directories([AFTER|BEFORE] [SYSTEM] dir1 [dir2 ...])
它相当于g++选项中的-I参数的作用,也相当于环境变量中增加路径到CPLUS_INCLUDE_PATH变量的作用。
include_directories(../../../thirdparty/comm/include)
2. 添加需要链接的库文件目录LINK_DIRECTORIES
语法:
link_directories(directory1 directory2 ...)
它相当于g++命令的-L选项的作用,也相当于环境变量中增加LD_LIBRARY_PATH的路径的作用。
link_directories("/home/server/third/lib")
3. 查找库所在目录FIND_LIBRARY
语法:
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A short-hand signature is:
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find_library (<VAR> name1 [path1 path2 ...])
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The general signature is:
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find_library (
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<VAR>
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name | NAMES name1 [name2 ...] [NAMES_PER_DIR]
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[HINTS path1 [path2 ... ENV var]]
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[PATHS path1 [path2 ... ENV var]]
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[PATH_SUFFIXES suffix1 [suffix2 ...]]
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[DOC "cache documentation string"]
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[NO_DEFAULT_PATH]
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[NO_CMAKE_ENVIRONMENT_PATH]
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[NO_CMAKE_PATH]
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[NO_SYSTEM_ENVIRONMENT_PATH]
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[NO_CMAKE_SYSTEM_PATH]
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[CMAKE_FIND_ROOT_PATH_BOTH |
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ONLY_CMAKE_FIND_ROOT_PATH |
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NO_CMAKE_FIND_ROOT_PATH]
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)
例子如下:
FIND_LIBRARY(RUNTIME_LIB rt /usr/lib /usr/local/lib NO_DEFAULT_PATH)
cmake会在目录中查找,如果所有目录中都没有,值RUNTIME_LIB就会被赋为NO_DEFAULT_PATH
4. 添加需要链接的库文件路径LINK_LIBRARIES
语法:
link_libraries(library1 <debug | optimized> library2 ...)
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# 直接是全路径
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link_libraries(“/home/server/third/lib/libcommon.a”)
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# 下面的例子,只有库名,cmake会自动去所包含的目录搜索
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link_libraries(iconv)
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# 传入变量
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link_libraries(${RUNTIME_LIB})
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# 也可以链接多个
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link_libraries("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so" "/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
可以链接一个,也可以多个,中间使用空格分隔.
5. 设置要链接的库文件的名称TARGET_LINK_LIBRARIES
语法:
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target_link_libraries(<target> [item1 [item2 [...]]]
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[[debug|optimized|general] <item>] ...)
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# 以下写法都可以:
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target_link_libraries(myProject comm) # 连接libhello.so库,默认优先链接动态库
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target_link_libraries(myProject libcomm.a) # 显示指定链接静态库
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target_link_libraries(myProject libcomm.so) # 显示指定链接动态库
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# 再如:
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target_link_libraries(myProject libcomm.so) #这些库名写法都可以。
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target_link_libraries(myProject comm)
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target_link_libraries(myProject -lcomm)
6. 为工程生成目标文件
语法:
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add_executable(<name> [WIN32] [MACOSX_BUNDLE]
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[EXCLUDE_FROM_ALL]
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source1 [source2 ...])
简单的例子如下:
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add_executable(demo
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main.cpp
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)
6. 最后贴一个完整的例子
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cmake_minimum_required (VERSION 2.6)
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INCLUDE_DIRECTORIES(../../thirdparty/comm)
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FIND_LIBRARY(COMM_LIB comm ../../thirdparty/comm/lib NO_DEFAULT_PATH)
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FIND_LIBRARY(RUNTIME_LIB rt /usr/lib /usr/local/lib NO_DEFAULT_PATH)
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link_libraries(${COMM_LIB} ${RUNTIME_LIB})
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ADD_DEFINITIONS(
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-O3 -g -W -Wall
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-Wunused-variable -Wunused-parameter -Wunused-function -Wunused
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-Wno-deprecated -Woverloaded-virtual -Wwrite-strings
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-D__WUR= -D_REENTRANT -D_FILE_OFFSET_BITS=64 -DTIXML_USE_STL
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)
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add_library(lib_demo
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cmd.cpp
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global.cpp
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md5.cpp
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)
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link_libraries(lib_demo)
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add_executable(demo
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main.cpp
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# link library in static mode
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target_link_libraries(demo libuuid.a)
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另外,使用cmake生成makefile之后,make edit_cache可以编辑编译选项。
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不熟悉的命令可以去查找文档,贴个cmake3.0官方帮助文档地址
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https://cmake.org/cmake/help/v3.0/index.html