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    73226415
    Added a check in configure that verifies if <signal.h> is available, · 73226415
    Yang Tse authored
    defining HAVE_SIGNAL_H if the header is available.
    
    Added a check in configure that tests if the sig_atomic_t type is
    available, defining HAVE_SIG_ATOMIC_T if it is available. Providing
    a suitable default in setup_once.h if not available.
    
    Added a check in configure that tests if the sig_atomic_t type is
    already defined as volatile, defining HAVE_SIG_ATOMIC_T_VOLATILE
    if it is available and already defined as volatile.
    73226415
    History
    Added a check in configure that verifies if <signal.h> is available,
    Yang Tse authored
    defining HAVE_SIGNAL_H if the header is available.
    
    Added a check in configure that tests if the sig_atomic_t type is
    available, defining HAVE_SIG_ATOMIC_T if it is available. Providing
    a suitable default in setup_once.h if not available.
    
    Added a check in configure that tests if the sig_atomic_t type is
    already defined as volatile, defining HAVE_SIG_ATOMIC_T_VOLATILE
    if it is available and already defined as volatile.