How do I run the preprocessor on local headers only?

Question

I want the preprocessor to read in the includes of local headers, but ignore the includes of system headers. To put it another way, how do I get the preprocessor to skip ov

Answer 1

With clang you can do e.g.:

 clang -Imyinclude -P -E -nostdinc -nobuiltininc main.cpp

There does not seem to be a way to preserve the system #include lines it cannot find though.

This doesn't work for gcc, as its preprocessor will stop when using -nostdinc and it can't find an #included header file.