LDBL_MANT_BIT      29 maint/gnulib/lib/float+.h # define LDBL_MANT_BIT LDBL_MANT_DIG
LDBL_MANT_BIT      33 maint/gnulib/lib/float+.h # define LDBL_MANT_BIT (LDBL_MANT_DIG * 2)
LDBL_MANT_BIT      37 maint/gnulib/lib/float+.h # define LDBL_MANT_BIT (LDBL_MANT_DIG * 4)