How to list all CMake build options and their default values?

Question

How can I list cmake default build option in command-line?.
I need to build OpenCV libraries from source, before that I want know what are the default build settings.

Answer 1

cmake -LA

To list all option( and set( CACHE (cached) variables do:

mkdir build
cd build
cmake ..
cmake -LA | awk '{if(f)print} /-- Cache values/{f=1}'

Sample stdout:

AUTOGEMM_ARCHITECTURE:STRING=Hawaii
BLAS_DEBUG_TOOLS:BOOL=OFF
BLAS_DUMP_CLBLAS_KERNELS:BOOL=OFF
BLAS_KEEP_KERNEL_SOURCES:BOOL=ON
BLAS_PRINT_BUILD_ERRORS:BOOL=O

The -A switch also show options marked as advanced, so you will likely want to omit it when casually browsing the most useful options.

ccmake ncurses

sudo apt-get install cmake-curses-gui
ccmake ..

shows:

Tested in Ubuntu 16.10, cmake 3.5.2.