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In our various supported host OSes, the time_t type may be either 32 or 64 bit, and could in theory also be either signed or unsigned. Notably, in OpenBSD time_t is a 64 bit type even if 'long' is 32 bits, so using LONG_MAX for TIME_MAX is incorrect. Use an approach suggested by Paolo Bonzini which calculates the maximum value of the type rather than hardcoding it; to do this we use the TYPE_MAXIMUM macro from Gnulib. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1511452598-6077-1-git-send-email-peter.maydell@linaro.org