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[Bug math/14343] Function logb() in math.h produces incorrect results for small inputs
- From: "carlos_odonell at mentor dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Tue, 24 Jul 2012 13:32:11 +0000
- Subject: [Bug math/14343] Function logb() in math.h produces incorrect results for small inputs
- Auto-submitted: auto-generated
- References: <bug-14343-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=14343
Carlos O'Donell <carlos_odonell at mentor dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |SUSPENDED
--- Comment #4 from Carlos O'Donell <carlos_odonell at mentor dot com> 2012-07-24 13:32:11 UTC ---
(In reply to comment #3)
> (In reply to comment #2)
> > Do you need a fix for this on the 2.15 stable branch?
> >
> > Is it enough that 2.16 has the fix?
> >
> > If you are compiling glibc yourself you can upgrade to 2.16.
>
> For some computers I use, it's fine that 2.16 has the fix, but I also have to
> deal with some enterprise machines that will be using glibc 2.15 for quite a
> while (the bug was discovered while testing some internal math libraries on
> these machines). Since this problem is quite widespread -- anyone with 64-bit
> glibc 2.15 will have an issue -- and this affects basic math functionality,
> there really should be a fix on the 2.15 stable branch...
Andre,
Thanks for the response. If you would like to see progress made on this I would
suggest the following course of action:
* Checkout glibc 2.15
* Apply the change made for BZ #13954 e.g.
http://sourceware.org/git/?p=glibc.git;a=commit;h=89c9aa491a7cee97bf78a29cddbf0a25c902a671
* Build glibc and run the testsuite.
* Build your application against the newly built glibc using -Wl,-rpath and
-Wl,--dynamic-linker and see if it fixes your issue.
If the newly built glibc 2.15 fixes your issue then do the following:
* Add the keyword glibc_2.15 to this issue indicating that you are requesting a
backport to the 2.15 stable branch.
* Mention the exact commit that you backported and tested, and include your
testsuite results and the machine you tested on.
At that point the 2.15 stable release branch manager can *easily* pickup the
fix for inclusion in the next 2.15 stable release e.g. 2.15.1.
I'm marking this bug as suspended pending help from someone to work on
backporting and testing a fix.
If you have *any* questions about how to do any of the above steps we would be
more than welcome to walk you through it on libc-help@sourceware.org. Please
don't hesitate to ask, no question is wrong :-)
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