How not to preprocess system headers

[seigneur]

Hi,

Is there a way to skip the preprocessing of system headers and extern
library headers when compiling with gcc ?

I have a very specific use of gcc, where I batch thousand of C or C++ files,
only dumping the AST generated. I do not link my .o files, and I do not want
to install the numerous libraries called by all the source files... 
What I'd like to do is preprocessing custom header files (which I have), but
none of the other header files...

Is it possible ?

Thanks a lot,
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