while — CMake 3.9.1 Documentation

# while

Evaluate a group of commands while a condition is true

    while(condition)
      COMMAND1(ARGS ...)
      COMMAND2(ARGS ...)
      ...
    endwhile(condition)

All commands between while and the matching `endwhile()` are recorded without being invoked. Once the `endwhile()` is evaluated, the recorded list of commands is invoked as long as the condition is true. The condition is evaluated using the same logic as the `if()` command.