1  #if __GNUC_PREREQ (13, 0)
       2  # define USE_LOGB_BUILTIN 1
       3  # define USE_LOGBF_BUILTIN 1
       4  #else
       5  # define USE_LOGB_BUILTIN 0
       6  # define USE_LOGBF_BUILTIN 0
       7  #endif
       8  
       9  #define USE_LOGBL_BUILTIN 0
      10  #define USE_LOGBF128_BUILTIN 0