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-rw-r--r--math/tgmath.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/math/tgmath.h b/math/tgmath.h
index 4f45aaa0f2..eefdd26c9c 100644
--- a/math/tgmath.h
+++ b/math/tgmath.h
@@ -48,7 +48,14 @@
/* 1 if 'type' is a floating type, 0 if 'type' is an integer type.
Allows for _Bool. Expands to an integer constant expression. */
-# define __floating_type(type) (((type) 0.25) && ((type) 0.25 - 1))
+# if __GNUC_PREREQ (3, 1)
+# define __floating_type(type) \
+ (__builtin_classify_type ((type) 0) == 8 \
+ || (__builtin_classify_type ((type) 0) == 9 \
+ && __builtin_classify_type (__real__ ((type) 0)) == 8))
+# else
+# define __floating_type(type) (((type) 0.25) && ((type) 0.25 - 1))
+# endif
/* The tgmath real type for T, where E is 0 if T is an integer type and
1 for a floating type. */