cmake語法不僅僅可以適用於 CMakeLists.txt，也適用於 xxx.cmake 文檔。
在 OpenCV 的 CMakeLists.txt 中，很多 ocv_XXX() 的函數，都是定義在相應的 xxx.cmake 中。
比如：L116
|
1
2
3
4
5
6
7
8
9
10
|
include(cmake
/OpenCVUtils
.cmake)
# must go before the project command
# @ 解說：
# @ ocv_update 函數定義在 cmake/OpenCVUtils.cmake 這個組件中，可以用Notepad++打開看看。
ocv_update(CMAKE_CONFIGURATION_TYPES
"Debug;Release"
CACHE STRING
"Configs"
FORCE)
if
(DEFINED CMAKE_BUILD_TYPE)
set_property( CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS ${CMAKE_CONFIGURATION_TYPES} )
endif()
|
函數定義：
|
1
2
3
4
5
|
function
(函數名 參數名)
...
endfunction()
|
例子：cmake/OpenCVMinDepVersions.cmake中
|
1
2
3
4
5
6
7
8
9
|
function
(ocv_cmake_eval var_name)
if
(DEFINED ${var_name})
file
(WRITE
"${CMAKE_BINARY_DIR}/CMakeCommand-${var_name}.cmake"
${${var_name}})
include(
"${CMAKE_BINARY_DIR}/CMakeCommand-${var_name}.cmake"
)
endif()
if
(
";${ARGN};"
MATCHES
";ONCE;"
)
unset
(${var_name} CACHE)
endif()
endfunction()
|
宏的定義：
|
1
2
3
|
macro(宏名 參數)
...
endmacro()
|
例子：cmake/OpenCVMinDepVersions.cmake中
|
1
2
3
4
|
macro(ocv_cmake_configure file_name var_name)
configure_file(${file_name}
"${CMAKE_BINARY_DIR}/CMakeConfig-${var_name}.cmake"
${ARGN})
file
(READ
"${CMAKE_BINARY_DIR}/CMakeConfig-${var_name}.cmake"
${var_name})
endmacro()
|
函數和宏不支持return，需要傳參出去，可以通過形參輸入傳出。
|
1
2
3
|
macro(ocv_xxx return_hello_world)
set
(return_hello_world
"Hello_World"
)
endmacro()
|