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firmware should always have been -ffreestanding, as it doesn't execute in the host environment. -ffreestanding implies -fno-builtin, so replace the option. inttypes.h isn't a freestanding header, but the 32bitbios_support.c only wants the stdint.h types so switch to the more appropriate include. This removes the build time dependency on a 32bit libc just to compile the hvmloader and friends. Update README and the TravisCI configuration. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Ian Jackson <iwj@xenproject.org> Release-Acked-by: Ian Jackson <iwj@xenproject.org>