GCC wards

NetBSD ships GCC 2.95 and 3.3, depending on version
GCC 3.4 and later are stricter, many GNUisms removed
label at end of compound statement
no implicit template references added (C++)
kill nested extern declarations
%ebx is an invalid operation for inline assembly in PIC
stricter checks for prototype matches
lvalue casts prohibited in C++, with 4.0 also in C
new (foo *)[2] is not valid C++
__FUNCTION__ was treated as string literal before, now it is working like a variable
typedef enum {} foo != enum foo {}