How to define a C++ preprocessor macro through the command line with CMake?

Question

I try to set a preprocessor macro in the command line of CMake. I\'ve tried:

set generator=\"Visual Studio 8 2005\"
set params=-D MY_MACRO=1
cmake.exe -G %ge         


        

Answer 1

Unless you have a good reason not to, you should use ADD_DEFINITIONS(=[, ...]).

Just add the following line to your CMakeLists.txt:

ADD_DEFINITIONS("MY_MACRO=1")

CMake will take care of the syntax of the switches (be it -D=, or /D=).