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-rw-r--r--math/math.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/math/math.h b/math/math.h
index 274647e70f..fe7f46f84b 100644
--- a/math/math.h
+++ b/math/math.h
@@ -200,8 +200,14 @@ enum
#ifdef __USE_MISC
/* Support for various different standard error handling behaviors. */
-
-typedef enum { _IEEE_ = -1, _SVID_, _XOPEN_, _POSIX_ } _LIB_VERSION_TYPE;
+typedef enum
+{
+ _IEEE_ = -1, /* According to IEEE 754/IEEE 854. */
+ _SVID_, /* According to System V, release 4. */
+ _XOPEN_, /* Nowadays also Unix98. */
+ _POSIX_,
+ _ISOC_ /* Actually this is ISO C 9X. */
+} _LIB_VERSION_TYPE;
/* This variable can be changed at run-time to any of the values above to
affect floating point error handling behavior (it may also be necessary