How to apply a C preprocessor only to certain (#if/#endif) directives?

Question

I was wondering if it is possible, and if yes how, can I run a C preprocessor, like cpp, on a C++ source file and only process the conditional directives #

Answer 1

You can use g++ -E option to stop after preprocessing stage

-E -> stop after the preprocessing stage.The output is in the form of preprocessed source code, which is sent to the standard output