the __SUPPORT_SNAN__ check may be skipped for those versions. */
/* Return number of classification appropriate for X. */
-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__ \
+# if ((__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
+ || __glibc_clang_prereq (2,8)) \
&& (!defined __OPTIMIZE_SIZE__ || defined __cplusplus)
/* The check for __cplusplus allows the use of the builtin, even
when optimization for size is on. This is provided for
# endif
/* Return nonzero value if sign of X is negative. */
-# if __GNUC_PREREQ (6,0)
+# if __GNUC_PREREQ (6,0) || __glibc_clang_prereq (3,3)
# define signbit(x) __builtin_signbit (x)
# elif defined __cplusplus
/* In C++ mode, __MATH_TG cannot be used, because it relies on
# endif
/* Return nonzero value if X is not +-Inf or NaN. */
-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
+ || __glibc_clang_prereq (2,8)
# define isfinite(x) __builtin_isfinite (x)
# else
# define isfinite(x) __MATH_TG ((x), __finite, (x))
# endif
/* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN. */
-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
+ || __glibc_clang_prereq (2,8)
# define isnormal(x) __builtin_isnormal (x)
# else
# define isnormal(x) (fpclassify (x) == FP_NORMAL)
/* Return nonzero value if X is a NaN. We could use `fpclassify' but
we already have this functions `__isnan' and it is faster. */
-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
+ || __glibc_clang_prereq (2,8)
# define isnan(x) __builtin_isnan (x)
# else
# define isnan(x) __MATH_TG ((x), __isnan, (x))
# define isinf(x) \
(__builtin_types_compatible_p (__typeof (x), _Float128) \
? __isinff128 (x) : __builtin_isinf_sign (x))
-# elif __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
+# elif (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
+ || __glibc_clang_prereq (3,7)
# define isinf(x) __builtin_isinf_sign (x)
# else
# define isinf(x) __MATH_TG ((x), __isinf, (x))