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test_find_path.cmake
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test_find_path.cmake
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# Blog: https://blog.csdn.net/fengbingchun/article/details/127336961
message("#### test_${TEST_CMAKE_FEATURE}.cmake ####")
set(FLAG 8 CACHE STRING "Values that can be specified: [1, 8]" FORCE) # 设置FLAG,用来指定测试哪个代码段
if(${FLAG} STREQUAL "1") # 使用NAMES项
unset(var CACHE) # 清除变量,带有CACHE也从缓存文件CMakeCache.txt中清除,若不带CACHE则缓存文件CMakeCache.txt中仍然存在var的值
find_path(var NAMES opencv.hpp HINTS /opt/opencv3.1/include/opencv2)
message("var: ${var}") # var: /opt/opencv3.1/include/opencv2
unset(var CACHE)
find_path(var string.h) # 最简格式：find_path(<VAR> name),查找默认路径
message("var: ${var}") # var: /usr/include
# 如果找到目录,则结果将存储在变量中,除非清除变量,否则不会重复搜索
find_path(var NAMES opencv.hpp HINTS /opt/opencv3.1/include/opencv2) # 注意:未清除变量,不会重复搜索,最终结果是不对的,并没有查找opencv.hpp文件所在的目录
message("var: ${var}") # var: /usr/include
unset(var) # 若不带CACHE,则var是/usr/include而不是/opt/opencv3.1/include/opencv2
find_path(var NAMES opencv.hpp HINTS /opt/opencv3.1/include/opencv2)
message("var: ${var}") # var: /usr/include
unset(var CACHE)
find_path(var NAMES opencv.hpp) # 如果没找到目录,结果将为<VAR>-NOTFOUND
message("var: ${var}") # var: var-NOTFOUND
if(${var} STREQUAL "var-NOTFOUND")
message(WARNING "the specified directory was not found")
endif()
if(NOT var) # 注意这里是var不是${var}
message(WARNING "the specified directory was not found")
endif()
unset(var) # 不带CACHE则缓存文件CMakeCache.txt中仍然存在var的值
elseif(${FLAG} STREQUAL "2") # 使用PATHS和HINTS项
# 手动在/opt目录下建了个空的string.h文件
unset(var CACHE)
find_path(var NAMES string.h PATHS /opt) # PATHS:先搜索系统路径,然后再搜索PATHS指定的路径
message("var: ${var}") # var: /usr/include
unset(var CACHE)
find_path(var NAMES string.h HINTS /opt) # HINTS:先搜索HINTS指定的路径,然后再搜索系统路径
message("var: ${var}") # var: /opt
elseif(${FLAG} STREQUAL "4") # 使用PATH_SUFFIXES项
unset(var CACHE)
find_path(var NAMES opencv.hpp PATHS /opt/opencv3.1/ NO_DEFAULT_PATH) # 仅搜索:/opt/opencv3.1/
message("var: ${var}") # var: var-NOTFOUND
unset(var CACHE)
find_path(var NAMES opencv.hpp PATHS /opt/opencv3.1 PATH_SUFFIXES include/opencv2 NO_DEFAULT_PATH) # 搜索:(1)/opt/opencv3.1/; (2)/opt/opencv3.1/include/opencv2/
message("var: ${var}") # var: /opt/opencv3.1/include/opencv2
unset(var CACHE)
find_path(var NAMES opencv.hpp PATHS /opt/opencv3.4.2/ NO_DEFAULT_PATH) # 仅搜索:/opt/opencv3.4.2/
message("var: ${var}") # var: var-NOTFOUND
unset(var CACHE)
find_path(var NAMES opencv.hpp HINTS /opt/opencv3.4.2 PATH_SUFFIXES include/opencv2 NO_DEFAULT_PATH) # 搜索:(1)/opt/opencv3.4.2/; (2)/opt/opencv3.4.2/include/opencv2/
message("var: ${var}") # var: /opt/opencv3.4.2/include/opencv2
elseif(${FLAG} STREQUAL "5") # 使用DOC项
unset(var CACHE)
find_path(var NAMES opencv.hpp HINTS /opt/opencv3.1/include/opencv2 DOC "opencv head file") # CMakeCache.txt中会对var增加注释说明
message("var: ${var}") # var: /opt/opencv3.1/include/opencv2
elseif(${FLAG} STREQUAL "6") # 使用NO_CACHE项
unset(var1 CACHE)
find_path(var1 NAMES string.h NO_CACHE) # 带有NO_CACHE后,var1的值将不会存入CMakeCache.txt中
message("var1: ${var1}") # var1: /usr/include/
unset(var2 CACHE)
find_path(var2 NAMES string.h) # 不带NO_CACHE,var2的值将写入CMakeCache.txt中
message("var2: ${var2}") # var2: /usr/include/
elseif(${FLAG} STREQUAL "7") # 使用REQUIRED项
unset(var CACHE)
find_path(var NAMES opencv.hpp) # 找不到会继续后续的执行
message("var: ${var}") # var: var-NOTFOUND
unset(var CACHE)
find_path(var NAMES opencv.hpp REQUIRED) # 将触发error,停止后续的执行:CMake Error at test_find_path.cmake:76 (find_path): Could not find var using the following names: opencv.hpp
elseif(${FLAG} STREQUAL "8") # 使用NO_DEFAULT_PATH项:指定NO_DEFAULT_PATH后默认搜索路径将失效,只会搜索PATHS和HINTS指定的路径
# 手动在/opt目录下建了个空的string.h文件
unset(var CACHE)
find_path(var NAMES string.h PATHS /opt NO_DEFAULT_PATH) # 指定不使用默认路径,path最后带不带"/"均可
message("var: ${var}") # var: /opt
unset(var CACHE)
find_path(var NAMES string.h NO_DEFAULT_PATH)
message("var: ${var}") # var: var-NOTFOUND
unset(var CACHE)
find_path(var NAMES string.h)
message("var: ${var}") # var: /usr/include
endif()