-DXXX编译器参数的CMAKE选项

Question

I have a C/C++ project compiled with gcc and using cmake 2.8+ . I know cmake supports some OPTION(XXX "Description..." ON/OFF) tag. I would like that these build options result somehow in -DXXX compile time arguments passed to gcc . How to do that most elegantly?

Answer 1

If you only care about adding -D compiler flags then the command you want is

add_definitions()

You could wrap that in a if() block to be turned on with the related option():

option(MY_FUNCTIONALITY "Cool functionality" ON)

if(MY_FUNCTIONALITY)
  add_definitions(-DENABLE_MY_FUNCTIONALITY)
endif()