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We can set the options like the following to compile some but not others:

-DBUILD_opencv_xfeatures2d=ON
-DBUILD_opencv_apps=OFF

As the above, my understanding is xfeatures2d will be compiles and apps definitely not, but other modules haven't specified in the options will be compiled by default. However, if apps is required for xfeatures2d then xfeatures won't be compiled and cmake output will warning this.

What the problems with the above understanding ?

Is there a way to say compile xfeatures2d and the modules it required only ?

Furthermore, is there a way to say compile xfeatures2d and the modules it required and optionally required ones?

We can set the options like the following to compile some but not others:

-DBUILD_opencv_xfeatures2d=ON
-DBUILD_opencv_apps=OFF

As the above, my understanding is xfeatures2d will be compiles compiled (The Makefiles will set it as a target for compilation) and apps definitely not, but other modules haven't specified in the options will be compiled by default. However, if apps is required for xfeatures2d then xfeatures won't be compiled and cmake output will warning this.

What the problems with the above understanding ?

Is there a way to say compile xfeatures2d and the modules it required only ?

Furthermore, is there a way to say compile xfeatures2d and the modules it required and optionally required ones?

We can set the options like the following to compile some but not others:

-DBUILD_opencv_xfeatures2d=ON
-DBUILD_opencv_apps=OFF

As the above, my understanding is xfeatures2d will be compiled (The Makefiles will set it as a target for compilation) and apps definitely not, but other modules haven't specified in the options will be compiled by default. However, if apps is required for xfeatures2d then xfeatures won't be compiled and cmake output will warning this.

What the problems with the above understanding ?

Is there a way to say compile xfeatures2d and the modules it required only ?

Furthermore, is there a way to say compile xfeatures2d and the modules it required and optionally required ones?

We can set the options like the following to compile some but not others:

-DBUILD_opencv_xfeatures2d=ON
-DBUILD_opencv_apps=OFF

As the above, my understanding is xfeatures2d will be compiled (The Makefiles will set it as a target for compilation) and apps definitely not, but other modules haven't specified in the options will be compiled by default. However, if apps is required for xfeatures2d then xfeatures won't be compiled and cmake output will warning this.

What the problems with the above understanding ?

Is there a way to say compile xfeatures2d and the modules it required only ?

Furthermore, is there a way to say compile xfeatures2d and the modules it required and optionally required ones?

How about the WITH options, like -DWITH_1394=OFF, what is the default values for them ? Or, by default, it depends on the environment its running on? For instance, if CMake can find all (local) libraries needed for CUDA, -DWITH_CUDA will be ON by default.