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authorJoseph Myers <joseph@codesourcery.com>2017-01-12 01:52:37 +0000
committerJoseph Myers <joseph@codesourcery.com>2017-01-12 01:52:37 +0000
commit4dfb9c941132d7b10b897c678f360fd27d6f5c95 (patch)
treed23f1574d0c125532196465cbe291679c20e976b /math
parent6a1cefac196f45d766027c97a6c8c44459c9cccd (diff)
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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.
Diffstat (limited to 'math')
-rw-r--r--math/fgetexcptflg.c1
1 files changed, 1 insertions, 0 deletions
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)