cmake基礎(chǔ)學(xué)習(xí)教程
https://juejin.cn/post/6844903557183832078
官方完整CMakeLists
cmake_minimum_required(VERSION 3.0)
project(PaddleObjectDetector CXX C)
option(WITH_MKL "Compile demo with MKL/OpenBlas support,defaultuseMKL." ON)
option(WITH_GPU "Compile demo with GPU/CPU, default use CPU." ON)
option(WITH_TENSORRT "Compile demo with TensorRT." OFF)
option(WITH_KEYPOINT "Whether to Compile KeyPoint detector" OFF)
option(WITH_MOT "Whether to Compile MOT detector" OFF)
SET(PADDLE_DIR "" CACHE PATH "Location of libraries")
SET(PADDLE_LIB_NAME "" CACHE STRING "libpaddle_inference")
SET(OPENCV_DIR "" CACHE PATH "Location of libraries")
SET(CUDA_LIB "" CACHE PATH "Location of libraries")
SET(CUDNN_LIB "" CACHE PATH "Location of libraries")
SET(TENSORRT_INC_DIR "" CACHE PATH "Compile demo with TensorRT")
SET(TENSORRT_LIB_DIR "" CACHE PATH "Compile demo with TensorRT")
include(cmake/yaml-cpp.cmake)
include_directories("${CMAKE_SOURCE_DIR}/")
include_directories("${CMAKE_CURRENT_BINARY_DIR}/ext/yaml-cpp/src/ext-yaml-cpp/include")
link_directories("${CMAKE_CURRENT_BINARY_DIR}/ext/yaml-cpp/lib")
if (WITH_KEYPOINT)
set(SRCS src/main_keypoint.cc src/preprocess_op.cc src/object_detector.cc src/picodet_postprocess.cc src/utils.cc src/keypoint_detector.cc src/keypoint_postprocess.cc)
elseif (WITH_MOT)
set(SRCS src/main_jde.cc src/preprocess_op.cc src/object_detector.cc src/jde_detector.cc src/tracker.cc src/trajectory.cc src/lapjv.cpp src/picodet_postprocess.cc src/utils.cc)
else ()
set(SRCS src/main.cc src/preprocess_op.cc src/object_detector.cc src/picodet_postprocess.cc src/utils.cc)
endif()
#這個(gè)宏定義的意思是如果這些flag中有MD即動(dòng)態(tài)版本，都要替換成靜態(tài)版本
macro(safe_set_static_flag)
foreach(flag_var
CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
if(${flag_var} MATCHES "/MD")
string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
endif(${flag_var} MATCHES "/MD")
endforeach(flag_var)
endmacro()
if (WITH_MKL)
ADD_DEFINITIONS(-DUSE_MKL)
endif()
if (NOT DEFINED PADDLE_DIR OR ${PADDLE_DIR} STREQUAL "")
message(FATAL_ERROR "please set PADDLE_DIR with -DPADDLE_DIR=/path/paddle_influence_dir")
endif()
message("PADDLE_DIR IS:" ${PADDLE_DIR})
if (NOT DEFINED OPENCV_DIR OR ${OPENCV_DIR} STREQUAL "")
message(FATAL_ERROR "please set OPENCV_DIR with -DOPENCV_DIR=/path/opencv")
endif()
include_directories("${CMAKE_SOURCE_DIR}/")
include_directories("${PADDLE_DIR}/")
include_directories("${PADDLE_DIR}/third_party/install/protobuf/include")
include_directories("${PADDLE_DIR}/third_party/install/glog/include")
include_directories("${PADDLE_DIR}/third_party/install/gflags/include")
include_directories("${PADDLE_DIR}/third_party/install/xxhash/include")
if (EXISTS "${PADDLE_DIR}/third_party/install/snappy/include")
include_directories("${PADDLE_DIR}/third_party/install/snappy/include")
endif()
if(EXISTS "${PADDLE_DIR}/third_party/install/snappystream/include")
include_directories("${PADDLE_DIR}/third_party/install/snappystream/include")
endif()
include_directories("${PADDLE_DIR}/third_party/boost")
include_directories("${PADDLE_DIR}/third_party/eigen3")
if (EXISTS "${PADDLE_DIR}/third_party/install/snappy/lib")
link_directories("${PADDLE_DIR}/third_party/install/snappy/lib")
endif()
if(EXISTS "${PADDLE_DIR}/third_party/install/snappystream/lib")
link_directories("${PADDLE_DIR}/third_party/install/snappystream/lib")
endif()
link_directories("${PADDLE_DIR}/third_party/install/protobuf/lib")
link_directories("${PADDLE_DIR}/third_party/install/glog/lib")
link_directories("${PADDLE_DIR}/third_party/install/gflags/lib")
link_directories("${PADDLE_DIR}/third_party/install/xxhash/lib")
link_directories("${PADDLE_DIR}/third_party/install/paddle2onnx/lib")
link_directories("${PADDLE_DIR}/third_party/install/onnxruntime/lib")
link_directories("${PADDLE_DIR}/paddle/lib/")
link_directories("${CMAKE_CURRENT_BINARY_DIR}")
if (WIN32)
include_directories("${PADDLE_DIR}/paddle/fluid/inference")
include_directories("${PADDLE_DIR}/paddle/include")
link_directories("${PADDLE_DIR}/paddle/fluid/inference")
find_package(OpenCV REQUIRED PATHS ${OPENCV_DIR}/build/ NO_DEFAULT_PATH)
else ()
find_package(OpenCV REQUIRED PATHS ${OPENCV_DIR}/share/OpenCV NO_DEFAULT_PATH)
include_directories("${PADDLE_DIR}/paddle/include")
link_directories("${PADDLE_DIR}/paddle/lib")
endif ()
include_directories(${OpenCV_INCLUDE_DIRS})
if (WIN32)
add_definitions("/DGOOGLE_GLOG_DLL_DECL=")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /bigobj /MTd")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /bigobj /MT")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /bigobj /MTd")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /bigobj /MT")
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -o2 -fopenmp -std=c++11")
set(CMAKE_STATIC_LIBRARY_PREFIX "")
endif()
# TODO let users define cuda lib path
if (WITH_GPU)
if (NOT DEFINED CUDA_LIB OR ${CUDA_LIB} STREQUAL "")
message(FATAL_ERROR "please set CUDA_LIB with -DCUDA_LIB=/path/cuda-8.0/lib64")
endif()
if (NOT WIN32)
if (NOT DEFINED CUDNN_LIB)
message(FATAL_ERROR "please set CUDNN_LIB with -DCUDNN_LIB=/path/cudnn_v7.4/cuda/lib64")
endif()
endif(NOT WIN32)
endif()
if (NOT WIN32)
if (WITH_TENSORRT AND WITH_GPU)
include_directories("${TENSORRT_INC_DIR}/")
link_directories("${TENSORRT_LIB_DIR}/")
endif()
endif(NOT WIN32)
if (NOT WIN32)
set(NGRAPH_PATH "${PADDLE_DIR}/third_party/install/ngraph")
if(EXISTS ${NGRAPH_PATH})
include(GNUInstallDirs)
include_directories("${NGRAPH_PATH}/include")
link_directories("${NGRAPH_PATH}/${CMAKE_INSTALL_LIBDIR}")
set(NGRAPH_LIB ${NGRAPH_PATH}/${CMAKE_INSTALL_LIBDIR}/libngraph${CMAKE_SHARED_LIBRARY_SUFFIX})
endif()
endif()
if(WITH_MKL)
include_directories("${PADDLE_DIR}/third_party/install/mklml/include")
if (WIN32)
set(MATH_LIB ${PADDLE_DIR}/third_party/install/mklml/lib/mklml.lib
${PADDLE_DIR}/third_party/install/mklml/lib/libiomp5md.lib)
else ()
set(MATH_LIB ${PADDLE_DIR}/third_party/install/mklml/lib/libmklml_intel${CMAKE_SHARED_LIBRARY_SUFFIX}
${PADDLE_DIR}/third_party/install/mklml/lib/libiomp5${CMAKE_SHARED_LIBRARY_SUFFIX})
execute_process(COMMAND cp -r ${PADDLE_DIR}/third_party/install/mklml/lib/libmklml_intel${CMAKE_SHARED_LIBRARY_SUFFIX} /usr/lib)
endif ()
set(MKLDNN_PATH "${PADDLE_DIR}/third_party/install/mkldnn")
if(EXISTS ${MKLDNN_PATH})
include_directories("${MKLDNN_PATH}/include")
if (WIN32)
set(MKLDNN_LIB ${MKLDNN_PATH}/lib/mkldnn.lib)
else ()
set(MKLDNN_LIB ${MKLDNN_PATH}/lib/libmkldnn.so.0)
endif ()
endif()
else()
set(MATH_LIB ${PADDLE_DIR}/third_party/install/openblas/lib/libopenblas${CMAKE_STATIC_LIBRARY_SUFFIX})
endif()
if (WIN32)
if(EXISTS "${PADDLE_DIR}/paddle/fluid/inference/${PADDLE_LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX}")
set(DEPS
${PADDLE_DIR}/paddle/fluid/inference/${PADDLE_LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
else()
set(DEPS
${PADDLE_DIR}/paddle/lib/${PADDLE_LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
endif()
endif()
if (WIN32)
set(DEPS ${PADDLE_DIR}/paddle/lib/${PADDLE_LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
else()
set(DEPS ${PADDLE_DIR}/paddle/lib/${PADDLE_LIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX})
endif()
message("PADDLE_LIB_NAME:" ${PADDLE_LIB_NAME})
message("DEPS:" $DEPS)
if (NOT WIN32)
set(DEPS ${DEPS}
${MATH_LIB} ${MKLDNN_LIB}
glog gflags protobuf z xxhash yaml-cpp
)
if(EXISTS "${PADDLE_DIR}/third_party/install/snappystream/lib")
set(DEPS ${DEPS} snappystream)
endif()
if (EXISTS "${PADDLE_DIR}/third_party/install/snappy/lib")
set(DEPS ${DEPS} snappy)
endif()
else()
set(DEPS ${DEPS}
${MATH_LIB} ${MKLDNN_LIB}
glog gflags_static libprotobuf xxhash libyaml-cppmt)
set(DEPS ${DEPS} libcmt shlwapi)
if (EXISTS "${PADDLE_DIR}/third_party/install/snappy/lib")
set(DEPS ${DEPS} snappy)
endif()
if(EXISTS "${PADDLE_DIR}/third_party/install/snappystream/lib")
set(DEPS ${DEPS} snappystream)
endif()
endif(NOT WIN32)
if(WITH_GPU)
if(NOT WIN32)
if (WITH_TENSORRT)
set(DEPS ${DEPS} ${TENSORRT_LIB_DIR}/libnvinfer${CMAKE_SHARED_LIBRARY_SUFFIX})
set(DEPS ${DEPS} ${TENSORRT_LIB_DIR}/libnvinfer_plugin${CMAKE_SHARED_LIBRARY_SUFFIX})
endif()
set(DEPS ${DEPS} ${CUDA_LIB}/libcudart${CMAKE_SHARED_LIBRARY_SUFFIX})
set(DEPS ${DEPS} ${CUDNN_LIB}/libcudnn${CMAKE_SHARED_LIBRARY_SUFFIX})
else()
set(DEPS ${DEPS} ${CUDA_LIB}/cudart${CMAKE_STATIC_LIBRARY_SUFFIX} )
set(DEPS ${DEPS} ${CUDA_LIB}/cublas${CMAKE_STATIC_LIBRARY_SUFFIX} )
set(DEPS ${DEPS} ${CUDNN_LIB}/cudnn${CMAKE_STATIC_LIBRARY_SUFFIX})
endif()
endif()
if (NOT WIN32)
set(EXTERNAL_LIB "-ldl -lrt -lgomp -lz -lm -lpthread")
set(DEPS ${DEPS} ${EXTERNAL_LIB})
endif()
set(DEPS ${DEPS} ${OpenCV_LIBS})
add_executable(main ${SRCS})
ADD_DEPENDENCIES(main ext-yaml-cpp)
message("DEPS:" $DEPS)
target_link_libraries(main ${DEPS})
if (WIN32 AND WITH_MKL)
add_custom_command(TARGET main POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/mklml/lib/mklml.dll ./mklml.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/mklml/lib/libiomp5md.dll ./libiomp5md.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/mkldnn/lib/mkldnn.dll ./mkldnn.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/mklml/lib/mklml.dll ./release/mklml.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/mklml/lib/libiomp5md.dll ./release/libiomp5md.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/mkldnn/lib/mkldnn.dll ./release/mkldnn.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/paddle/lib/${PADDLE_LIB_NAME}.dll ./release/${PADDLE_LIB_NAME}.dll
)
endif()
if (WIN32 AND NOT WITH_MKL)
add_custom_command(TARGET main POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/openblas/lib/openblas.dll ./openblas.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/openblas/lib/openblas.dll ./release/openblas.dll
)
endif()
if (WIN32)
add_custom_command(TARGET main POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/onnxruntime/lib/onnxruntime.dll ./onnxruntime.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/paddle2onnx/lib/paddle2onnx.dll ./paddle2onnx.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/onnxruntime/lib/onnxruntime.dll ./release/onnxruntime.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/third_party/install/paddle2onnx/lib/paddle2onnx.dll ./release/paddle2onnx.dll
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${PADDLE_DIR}/paddle/lib/${PADDLE_LIB_NAME}.dll ./release/${PADDLE_LIB_NAME}.dll
)
endif()
project()
項(xiàng)目名
option(
variable 選項(xiàng)名
help_text 描述、解釋、備注
value 選項(xiàng)初始化值（除ON而外全為OFF）)
SET（）
這個(gè)大寫的SET其實(shí)和小寫的set是一樣的，CMake中的命令不區(qū)分大小寫，CMake中的變量區(qū)分大小寫
官方手冊
Set a normal, cache, or environment variable to a given value.
See the :ref:`cmake-language(7) variables <CMake Language Variables>`
documentation for the scopes and interaction of normal variables
and cache entries.
Signatures of this command that specify a ``<value>...`` placeholder
expect zero or more arguments. Multiple arguments will be joined as
a :ref:`semicolon-separated list <CMake Language Lists>` to form the actual variable
value to be set. Zero arguments will cause normal variables to be
unset. See the ``unset()`` command to unset variables explicitly.
Set Normal Variable
^^^^^^^^^^^^^^^^^^^
set(<variable> <value>... [PARENT_SCOPE])
Sets the given ``<variable>`` in the current function or directory scope.
- 比較好的案例博客https://blog.csdn.net/Calvin_zhou/article/details/104060927
include(cmake/yaml-cpp.cmake)
加載cmake文件的
Load and run CMake code from a file or module.
include(<file|module> [OPTIONAL] [RESULT_VARIABLE <var>]
[NO_POLICY_SCOPE])
Loads and runs CMake code from the file given. Variable reads and
writes access the scope of the caller (dynamic scoping). If ``OPTIONAL``
is present, then no error is raised if the file does not exist. If
``RESULT_VARIABLE`` is given the variable ``<var>`` will be set to the
full filename which has been included or ``NOTFOUND`` if it failed.
If a module is specified instead of a file, the file with name
``<modulename>.cmake`` is searched first in ``CMAKE_MODULE_PATH``,
then in the CMake module directory. There is one exception to this: if
the file which calls ``include()`` is located itself in the CMake builtin
module directory, then first the CMake builtin module directory is searched and
``CMAKE_MODULE_PATH`` afterwards. See also policy ``CMP0017``.
include_directories(“${CMAKE_SOURCE_DIR}/”)
加載頭文件文件夾
Add include directories to the build.
include_directories([AFTER|BEFORE] [SYSTEM] dir1 [dir2 ...])
Add the given directories to those the compiler uses to search for
include files. Relative paths are interpreted as relative to the
current source directory.
The include directories are added to the ``INCLUDE_DIRECTORIES``
directory property for the current ``CMakeLists`` file. They are also
added to the ``INCLUDE_DIRECTORIES`` target property for each
target in the current ``CMakeLists`` file. The target property values
are the ones used by the generators.
By default the directories specified are appended onto the current list of
directories. This default behavior can be changed by setting
``CMAKE_INCLUDE_DIRECTORIES_BEFORE`` to ``ON``. By using
link_directories()
加載庫文件夾地址
Add directories in which the linker will look for libraries.
link_directories([AFTER|BEFORE] directory1 [directory2 ...])
Adds the paths in which the linker should search for libraries.
Relative paths given to this command are interpreted as relative to
the current source directory, see ``CMP0015``.
The command will apply only to targets created after it is called.
.. versionadded:: 3.13
The directories are added to the ``LINK_DIRECTORIES`` directory
property for the current ``CMakeLists.txt`` file, converting relative
paths to absolute as needed. See the ``cmake-buildsystem(7)``
manual for more on defining buildsystem properties.
.. versionadded:: 3.13
macro(safe_set_static_flag)函數(shù)
內(nèi)容
**endmacro**()
這個(gè)函數(shù)屬于宏定義，簡單的說就是出現(xiàn)宏的地方進(jìn)行代碼替換，
解析的很清楚的博文：
https://blog.csdn.net/qq_21438461/article/details/129729530
官方文檔：
Start recording a macro for later invocation as a command
macro(<name> [<arg1> ...])
<commands>
endmacro()
Defines a macro named ``<name>`` that takes arguments named
``<arg1>``, ... Commands listed after macro, but before the
matching ``endmacro()``, are not executed until the macro
is invoked.
Per legacy, the ``endmacro()`` command admits an optional
``<name>`` argument. If used, it must be a verbatim repeat of the
argument of the opening ``macro`` command.
See the ``cmake_policy()`` command documentation for the behavior
of policies inside macros.
foreach(參數(shù)，循環(huán)列表)函數(shù)
用于循環(huán)列表中的每一項(xiàng)
https://blog.csdn.net/wzj_110/article/details/116110014
Evaluate a group of commands for each value in a list.
foreach(<loop_var> <items>)
<commands>
endforeach()
where ``<items>`` is a list of items that are separated by
semicolon or whitespace.
All commands between ``foreach`` and the matching ``endforeach`` are recorded
without being invoked. Once the ``endforeach`` is evaluated, the recorded
list of commands is invoked once for each item in ``<items>``.
At the beginning of each iteration the variable ``<loop_var>`` will be set
to the value of the current item.
The scope of ``<loop_var>`` is restricted to the loop scope. See policy
``CMP0124`` for details.
MATCHES關(guān)鍵字
條件判斷
https://blog.csdn.net/steptoward/article/details/128848733
可用于正則表達(dá)式
-
string(REGEX REPLACE 查找值 替換值 輸出 輸入)
REGEX REPLACE指正則替換
https://blog.csdn.net/weixin_41923935/article/details/122155064
https://blog.csdn.net/m0_57845572/article/details/118520561
String operations.
Synopsis
^^^^^^^^
Search and Replace
string(FIND <string> <substring> <out-var> [...])
string(REPLACE <match-string> <replace-string> <out-var> <input>...)
string(REGEX MATCH <match-regex> <out-var> <input>...)
string(REGEX MATCHALL <match-regex> <out-var> <input>...)
string(REGEX REPLACE <match-regex> <replace-expr> <out-var> <input>...)
Manipulation
string(APPEND <string-var> [<input>...])
string(PREPEND <string-var> [<input>...])
string(CONCAT <out-var> [<input>...])
string(JOIN <glue> <out-var> [<input>...])
“/MD” “/MT”
ADD_DEFINITIONS(-DUSE_MKL)
這種可以在我們更改別人代碼做實(shí)驗(yàn)時(shí)使用，既不對其源碼進(jìn)行破壞，又可以添加自己的功能。有了這個(gè)后可以直接在編譯的時(shí)候進(jìn)行選擇。具體的，在工程CMakeLists.txt 中，使用add_definitions()函數(shù)控制代碼的開啟和關(guān)閉：
https://blog.csdn.net/fb_941219/article/details/107376017
Add -D define flags to the compilation of source files.
add_definitions(-DFOO -DBAR ...)
Adds definitions to the compiler command line for targets in the current
directory, whether added before or after this command is invoked, and for
the ones in sub-directories added after. This command can be used to add any
flags, but it is intended to add preprocessor definitions.
.. note::
This command has been superseded by alternatives:
* Use ``add_compile_definitions()`` to add preprocessor definitions.
* Use ``include_directories()`` to add include directories.
* Use ``add_compile_options()`` to add other options.
cmake關(guān)系操作符號(hào)
find_package(OpenCV REQUIRED PATHS ${OPENCV_DIR}/build/ NO_DEFAULT_PATH)函數(shù)
簡單的說就是用這個(gè)如果找到了.cmake文件，就不用專門寫link_directories，include_directories等函數(shù)來找頭文件和庫文件
Find a package (usually provided by something external to the project),
and load its package-specific details.
Search Modes
^^^^^^^^^^^^
The command has two very distinct ways of conducting the search:
**Module mode**
In this mode, CMake searches for a file called ``Find<PackageName>.cmake``,
looking first in the locations listed in the ``CMAKE_MODULE_PATH``,
then among the :ref:`Find Modules` provided by the CMake installation.
If the file is found, it is read and processed by CMake. It is responsible
for finding the package, checking the version, and producing any needed
messages. Some Find modules provide limited or no support for versioning;
check the Find module's documentation.
寫的最好的關(guān)于find_package的博文
https://blog.csdn.net/zhanghm1995/article/details/105466372
${CMAKE_SHARED_LIBRARY_SUFFIX}關(guān)鍵字
${CMAKE_STATIC_LIBRARY_SUFFIX}關(guān)鍵字
這個(gè)關(guān)鍵字能根據(jù)平臺(tái)不同，自動(dòng)為動(dòng)態(tài)庫靜態(tài)庫安排后綴，比如windows端的動(dòng)態(tài)庫后綴為dll，靜態(tài)庫為.lib,linux端的動(dòng)態(tài)庫后綴為.so,靜態(tài)庫后綴為.a
The suffix for shared libraries that you link to.
The suffix to use for the end of a shared library filename, ``.dll`` on
Windows.
add_dependencies()
大致意思是在同時(shí)生成可執(zhí)行文件a和庫b時(shí)，恰好可執(zhí)行文件a的生成需要依賴b這個(gè)庫時(shí)需要用這個(gè)函數(shù)來指定先生成庫b再生成可執(zhí)行文件a，如果不指定會(huì)報(bào)錯(cuò)找不到b依賴庫
有案例的博文http://t.csdn.cn/FZdWN
Add a dependency between top-level targets.
add_dependencies(<target> [<target-dependency>]...)
Makes a top-level ``<target>`` depend on other top-level targets to
ensure that they build before ``<target>`` does. A top-level target
is one created by one of the ``add_executable()``,
``add_library()``, or ``add_custom_target()`` commands
(but not targets generated by CMake like ``install``).
Dependencies added to an :ref:`imported target <Imported Targets>`
or an :ref:`interface library <Interface Libraries>` are followed
transitively in its place since the target itself does not build.
.. versionadded:: 3.3
Allow adding dependencies to interface libraries.
target_link_libraries
后面加具體依賴庫的庫名字，不需要加后綴
Specify libraries or flags to use when linking a given target and/or
its dependents. :ref:`Usage requirements <Target Usage Requirements>`
from linked library targets will be propagated. Usage requirements
of a target's dependencies affect compilation of its own sources.
Overview
^^^^^^^^
This command has several signatures as detailed in subsections below.
All of them have the general form
target_link_libraries(<target> ... <item>... ...)
The named ``<target>`` must have been created by a command such as
``add_executable()`` or ``add_library()`` and must not be an
:ref:`ALIAS target <Alias Targets>`. If policy ``CMP0079`` is not
set to ``NEW`` then the target must have been created in the current
add_custom_command
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Add a custom build rule to the generated build system.
There are two main signatures for ``add_custom_command``.
Generating Files
^^^^^^^^^^^^^^^^
The first signature is for adding a custom command to produce an output:
add_custom_command(OUTPUT output1 [output2 ...]
COMMAND command1 [ARGS] [args1...]
[COMMAND command2 [ARGS] [args2...] ...]
[MAIN_DEPENDENCY depend]
[DEPENDS [depends...]]
[BYPRODUCTS [files...]]
[IMPLICIT_DEPENDS <lang1> depend1
[<lang2> depend2] ...]
相關(guān)博文：
https://www.jianshu.com/p/47370c584356
https://blog.csdn.net/weixin_39766005/article/details/122866375
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