For a simple C program I did
gcc -E hello.c -o hello.pp
user $ gcc -E hello.c -o hello.pp
user $ tail -n 15 hello.pp
extern int ftrylockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;
extern void funlockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));
# 943 "/usr/include/stdio.h" 3 4
# 3 "hello.c" 2
printf("Hello world \n");
"How can I see only the C code, without those comments ?"
You can use
gcc with options
-E -P to get rid of the
# lines of the preprocessor output.
Inhibit generation of linemarkers in the output from the preprocessor. This might be useful when running the preprocessor on something that is not C code, and will be sent to a program which might be confused by the linemarkers.