qt5base-lts/config.tests/unix/clock-gettime/clock-gettime.cpp

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#include <unistd.h>
#include <time.h>

int main(int, char **)
{
#if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)) || defined(__OpenBSD__)
    timespec ts;
    clock_gettime(CLOCK_REALTIME, &ts);
#else
#  error "Feature _POSIX_TIMERS not available"
    // MIPSpro doesn't understand #error, so force a compiler error
    force_compiler_error = true;
#endif
    return 0;
}