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Add a check, like the existing check for non-ANSI C in the public headers, that runs the public headers through a C++ compiler to flag non-C++-friendly constructs. Unlike the ANSI C check, we accept GCC-isms (gnu++98), and we also check various tools-only headers. Also tidy up the runes for these checks to be a bit more readable. io/ring.h uses 'private' as a field name, which is a keyword in C++; this patch doesn't change that. Instead the check works around it. Reported-by: Razvan Cojocaru <rcojocaru@bitdefender.com> Signed-off-by: Tim Deegan <tim@xen.org> Acked-by: Jan Beulich <JBeulich@suse.com> Tested-by: Don Slutz <dslutz@verizon.com>