GNU C Library master sources branch master updated. glibc-2.26.9000-1065-g3c7d031

[wilco at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=3c7d03129498e7426855b5d4cdd5b7109ecc2172

commit 3c7d03129498e7426855b5d4cdd5b7109ecc2172
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Wed Jan 3 13:14:10 2018 +0000

    Improve math_errhandling
    
    Currently math_errhandling is always set to MATH_ERRNO | MATH_ERREXCEPT
    even if -fno-math-errno is used.  It is not defined at all when fast-math
    is used.  Set it to 0 with fast-math - this is noncomforming but more
    useful than not define math_errhandling at all. Also take __NO_MATH_ERRNO__
    into account and update comment.
    
    	* math/math.h (math_errhandling): Set to 0 with __FAST_MATH__.
    	Add __NO_MATH_ERRNO__ check.

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
 

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog   |    5 +++++
 math/math.h |   14 ++++++++++----
 2 files changed, 15 insertions(+), 4 deletions(-)


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