Clion: Conditional compilation flags

Question

I have some conditional compilation flags across multiple source files, which looks as following :

#ifdef FLAG1
   code ...
#endif

I have these flags enabled in the Makefile, based on some conditions. Clion grays out the blocks of code that are within the flags and doesn't perform any syntax analysis on them. Is there a way to enable some flags directly in Clion?

Answer 1

To add a preprocessor

add_definitions(-DFOO -DBAR ...)

See this link for CMake's documentation.

Answer 2

To make things work correctly, make sure that:

• your Makefile is in the root of your project in CLion, else it won't work, or at least didn't work for me
• make sure that in the Arguments field (on the screenshot) you provide all arguments you would do for a makefile to make all macro definitions (like -DFoo=bar). So if you run run make like make USE_THIS=1 DEBUG=1, type USE_THIS=1 DEBUG=1 into this field and reload Makefile project.