libcpp
	PR preprocessor/28165:
	* internal.h (cpp_in_primary_file): New function.
	* directives.c (do_include_next): Use cpp_in_primary_file.
	(do_pragma_once): Likewise.
	(do_pragma_system_header): Likewise.
gcc/testsuite
	PR preprocessor/28165:
	* gcc.dg/cpp/pr28165.c: New file.

From-SVN: r120441