Custom variable:
SET(opencv_dir "/mnt/d/android/OpenCV-3.4.8-android-sdk")
transfer:
INCLUDE_DIRECTORIES(${opencv_dir}/sdk/native/jni/include)
SET(OpenCV_LIB ${opencv_dir}/sdk/native/libs/arm64-v8a/libopencv_java3.so)
Print out custom variables:
语法：MESSAGE("include folder: "${include_dir})
The value of ${include_dir} is entered when the cmaek command is executed
Judgment variable usage:
Judging characters, else usage, printing messages
if(address STREQUAL "arm64-v8a")
message("defined address!!!!!!!!!!")
else()
message("NOT defined address!!!!!!!!!")
endif()
option(address "hello world" ON)
message("option is ${address}")
if(address)
message("defined address!!!!!!!!!!")
else()
message("NOT defined address!!!!!!!!!")
endif()
Example:
if (${ANDROID_ABI} STREQUAL "