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-rw-r--r--sysdeps/ia64/bits/floatn.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/sysdeps/ia64/bits/floatn.h b/sysdeps/ia64/bits/floatn.h
index c7b1df6d2c..dbb6eb2325 100644
--- a/sysdeps/ia64/bits/floatn.h
+++ b/sysdeps/ia64/bits/floatn.h
@@ -89,6 +89,14 @@ typedef __float128 _Float128;
 #  define __builtin_nansf128(x) ((_Float128) __builtin_nans (x))
 # endif
 
+/* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*,
+   e.g.: __builtin_signbitf128, before GCC 6.  However, there has never
+   been a __builtin_signbitf128 in GCC and the type-generic builtin is
+   only available since GCC 6.  */
+# if !__GNUC_PREREQ (6, 0)
+#  define __builtin_signbitf128 __signbitf128
+# endif
+
 #endif
 
 #endif /* _BITS_FLOATN_H */