$touch emptyfile
$cpp -dM emptyfile

转储所有默认的.对于具有一些#include和#define行的C文件也是一样的,它包括所有这些.我想你可以截断你的文件到你关心的地方,然后做同样的事情？

从man page：

-dCHARS
CHARS is a sequence of one or more of the following characters,and must not be preceded by a space. Other characters are interpreted by the compiler proper,or reserved for future versions of GCC,and so are silently ignored. If you specify characters whose behavior conflicts,the result is undefined.

M
Instead of the normal output,generate a list of #define directives for all the macros defined during the execution of the preprocessor,including predefined macros. This gives you a way of finding out what is predefined in your version of the preprocessor. Assuming you have no file foo.h,the command

06001

will show all the predefined macros.

If you use -dM without the -E option,-dM is interpreted as a synonym for -fdump-rtl-mach.

D
Like M except in two respects: it does not include the predefined macros,and it outputs both the #define directives and the result of preprocessing. Both kinds of output go to the standard output file.

N
Like D,but emit only the macro names,not their expansions.

I
Output #include directives in addition to the result of preprocessing.