GNU C Library master sources branch master updated. glibc-2.24-633-g4dfb9c9

[jsm28 at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=4dfb9c941132d7b10b897c678f360fd27d6f5c95

commit 4dfb9c941132d7b10b897c678f360fd27d6f5c95
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Jan 12 01:52:37 2017 +0000

    Make fallback fegetexceptflag work with generic fetestexceptflag.
    
    The generic implementation of fetestexceptflag does:
    
    int
    fetestexceptflag (const fexcept_t *flagp, int excepts)
    {
      /* Most versions of fegetexceptflag store exceptions in a form such
         that this works.  */
      return *flagp & excepts & FE_ALL_EXCEPT;
    }
    
    In the case where FE_ALL_EXCEPT is nonzero but exceptions may not be
    supported at runtime, this only works if fegetexceptflag cleared all
    the bits of FE_ALL_EXCEPT in *flagp; otherwise it accesses
    uninitialized data.  This showed up as a failure of
    math/test-fetestexceptflag for MIPS o32 soft-float.  This patch makes
    the fallback fegetexceptflag store 0 (fexcept_t is an integer type
    everywhere) so that this works.  (No bug report in Bugzilla because
    this wasn't user-visible - at least, without using tools to detect
    uninitialized memory use at runtime - without fetestexceptflag, which
    is new in 2.25.)
    
    Tested for MIPS o32 soft-float.
    
    	* math/fgetexcptflg.c (__fegetexceptflag): Store 0 in fexcept_t
    	object.

diff --git a/ChangeLog b/ChangeLog
index d86a9c7..5b0601f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-12  Joseph Myers  <joseph@codesourcery.com>
+
+	* math/fgetexcptflg.c (__fegetexceptflag): Store 0 in fexcept_t
+	object.
+
 2017-01-11  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #16458]
diff --git a/math/fgetexcptflg.c b/math/fgetexcptflg.c
index 8e16250..95a9217 100644
--- a/math/fgetexcptflg.c
+++ b/math/fgetexcptflg.c
@@ -24,6 +24,7 @@ int
 __fegetexceptflag (fexcept_t *flagp, int excepts)
 {
   /* Nothing to do.  */
+  *flagp = 0;
   return 0;
 }
 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)

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

Summary of changes:
 ChangeLog           |    5 +++++
 math/fgetexcptflg.c |    1 +
 2 files changed, 6 insertions(+), 0 deletions(-)


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