Modify default command to compile single files

[prayutsu]

Many competitive programmers use CLion for compiling single files. I have also installed "Single file execution" plugin and I am able to run single .cpp files with ease by adding the file as an executable in CMakeLists.txt and just clicking the play button. Now, I want to compile all my C++ files by predefining a macro, e.g -
$ g++ my_file.cpp -Dmacro_name

How can I set this as a default behavior so that if I simply add the file as an executable and run the play button, the files are compiled with predefining the macro?