Preprocessor

The FHS requires, for historical reasons, that /lib/cpp is a symbolic link to the preprocessor.

gcc provides a few options related to preprocessing:

• gcc -Wp to pass options via gcc to the preprocessor.
• gcc -E to invoke only the preprocessor (without compiling the compilation unit).
• gcc -C and gcc -CC to keep comments when creating an *.i file.

Some Visual Compiler options are /E, /P and /EP.

usr/bin/cpp

C / C++