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-rw-r--r--ChangeLog5
-rw-r--r--math/math.h14
2 files changed, 15 insertions, 4 deletions
diff --git a/ChangeLog b/ChangeLog
index d87d799..68b8c93 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-02 Wilco Dijkstra <wdijkstr@arm.com>
+
+ * math/math.h (math_errhandling): Set to 0 with __FAST_MATH__.
+ Add __NO_MATH_ERRNO__ check.
+
2018-01-02 Joseph Myers <joseph@codesourcery.com>
* sysdeps/mips/mips32/libm-test-ulps: Update.
diff --git a/math/math.h b/math/math.h
index 633681e..3c515f8 100644
--- a/math/math.h
+++ b/math/math.h
@@ -665,10 +665,16 @@ enum
# define MATH_ERRNO 1 /* errno set by math functions. */
# define MATH_ERREXCEPT 2 /* Exceptions raised by math functions. */
-/* By default all functions support both errno and exception handling.
- In gcc's fast math mode and if inline functions are defined this
- might not be true. */
-# ifndef __FAST_MATH__
+/* By default all math functions support both errno and exception handling
+ (except for soft floating point implementations which may only support
+ errno handling). If errno handling is disabled, exceptions are still
+ supported by GLIBC. Set math_errhandling to 0 with -ffast-math (this is
+ nonconforming but it is more useful than leaving it undefined). */
+# ifdef __FAST_MATH__
+# define math_errhandling 0
+# elif defined __NO_MATH_ERRNO__
+# define math_errhandling (MATH_ERREXCEPT)
+# else
# define math_errhandling (MATH_ERRNO | MATH_ERREXCEPT)
# endif