Is there a way,to see the expanded temporary code file that a preprocessor returns to the compiler?

Question

I want to see how header guards work by trying some program. Instead of a wild guess i want to see what actually happen(which macro it compile and which one it skip) after the preprocessor complete scanning the whole program.

I am currently working with Codeblocks.

Answer 1

you can use command line and execute commands step wise as required

Preprocessing: .c -> .i

gcc Hello.c -E -o Hello.i

Compiling: .i -> .s

gcc Hello.i -S

Assembling: .s -> .o

gcc Hello.s -c

Linking .o -> a.exe

gcc Hello.o

Loading

a.exe

Hello World!!!