Thread: Preprocessing C

I need to preprocess some C file, I am using the -P -E options.
(gcc -P -E *.c). This gives me what I need, but it also gives me TOO MUCH information. I need to get the same output without expanding all of the system include files, I still need the header files from the program I am preprocessing. Is there a way to do this?

Thanks,
TR

I am using gcc version 2.96 20000731. I am only using the -P and -E command line options.

The preprocessed output I am getting is expanding the system header files that I have included in the source and the header files that are included in my applications. I would like to exclude the system header file information from the preprocessed output. I don't think it is possible from the command line.

Thanks

Well if you want to just expand #define and #if, but leave all the #include, then you need a couple of additional steps

1. pre-preprocess the files, to change all the #include lines (only) into something the pre-processor won't touch
Say
!include "file.h"

2. pre-process the files as normal

3. undo step 1 by turning !include back into #include

This is dead easy in unix/linux with a couple of sed scripts.