罗列一下cmake常用的命令。
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:
A short-hand signature is:
find_library ( name1 [path1 path2 ...])
The general signature is:
find_library (
name | NAMES name1 [name2 ...] [NAMES_PER_DIR]
[HINTS path1 [path2 ... ENV var]]
[PATHS path1 [path2 ... ENV var]]
[PATH_SUFFIXES suffix1 [suffix2 ...]]
[DOC "cache documentation string"]
[NO_DEFAULT_PATH]
[NO_CMAKE_ENVIRONMENT_PATH]
[NO_CMAKE_PATH]
[NO_SYSTEM_ENVIRONMENT_PATH]
[NO_CMAKE_SYSTEM_PATH]
[CMAKE_FIND_ROOT_PATH_BOTH |
ONLY_CMAKE_FIND_ROOT_PATH |
NO_CMAKE_FIND_ROOT_PATH]
)
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
# 直接是全路径
link_libraries(“/home/server/third/lib/libcommon.a”)
# 下面的例子,只有库名,cmake会自动去所包含的目录搜索
link_libraries(iconv)
# 传入变量
link_libraries(${RUNTIME_LIB})
# 也可以链接多个
link_libraries("/opt/MATLAB/R2012a/bin/glnxa64/libeng.so" "/opt/MATLAB/R2012a/bin/glnxa64/libmx.so")
可以链接一个,也可以多个,中间使用空格分隔.
5. 设置要链接的库文件的名称TARGET_LINK_LIBRARIES
语法:target_link_libraries(
# 以下写法都可以:
target_link_libraries(myProject comm) # 连接libhello.so库,默认优先链接动态库
target_link_libraries(myProject libcomm.a) # 显示指定链接静态库
target_link_libraries(myProject libcomm.so) # 显示指定链接动态库
# 再如:
target_link_libraries(myProject libcomm.so) #这些库名写法都可以。
target_link_libraries(myProject comm)
target_link_libraries(myProject -lcomm)
6. 为工程生成目标文件
语法:add_executable(
简单的例子如下:add_executable(demo main.cpp )
7. 最后贴一个完整的例子
cmake_minimum_required (VERSION 2.6)
INCLUDE_DIRECTORIES(../../thirdparty/comm)
FIND_LIBRARY(COMM_LIB comm ../../thirdparty/comm/lib NO_DEFAULT_PATH)
FIND_LIBRARY(RUNTIME_LIB rt /usr/lib /usr/local/lib NO_DEFAULT_PATH)
link_libraries(${COMM_LIB} ${RUNTIME_LIB})
ADD_DEFINITIONS(
-O3 -g -W -Wall
-Wunused-variable -Wunused-parameter -Wunused-function -Wunused
-Wno-deprecated -Woverloaded-virtual -Wwrite-strings
-D__WUR= -D_REENTRANT -D_FILE_OFFSET_BITS=64 -DTIXML_USE_STL
)
add_library(lib_demo
cmd.cpp
global.cpp
md5.cpp
)
link_libraries(lib_demo)
add_executable(demo
main.cpp
)
# link library in static mode
target_link_libraries(demo libuuid.a)
另外,使用cmake生成makefile之后,make edit_cache可以编辑编译选项
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
https://cmake.org/cmake/help/v3.0/index.html