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Re: [Bug libfortran/25017] sqrt, csqrt may give a wrong result if real part of compex argument is zero

From: Jerry DeLisle <jvdelisle at verizon dot net>
To: gcc-bugzilla at gcc dot gnu dot org
Cc: gcc-bugs at gcc dot gnu dot org
Date: Thu, 24 Nov 2005 08:32:59 -0800
Subject: Re: [Bug libfortran/25017] sqrt, csqrt may give a wrong result if real part of compex argument is zero
References: <bug-25017-8520@http.gcc.gnu.org/bugzilla/> <20051124130507.17191.qmail@sourceware.org>

fxcoudert at gcc dot gnu dot org wrote:

------- Comment #1 from fxcoudert at gcc dot gnu dot org  2005-11-24 13:05 -------
This bug is in glibc (same code on non-glibc platform, such as sparc-solaris,
will give the right answer). It was reported in glibc bugzilla as #1466
(http://sources.redhat.com/bugzilla/show_bug.cgi?id=1466), and is now fixed in
glibc CVS.

Perhaps we need to workaround that bug somewhere. Opinions, please!

How long before next glibc release? This problem could be painful for folks that are using gfortran for real world applications who are not aware.

Maybe we need to add an errata file to the tree and add a message at the end of configure to remind people to read the errata file. This would go for all of gcc, not just gfortran.

Jerry

References:
- [Bug libfortran/25017] New: sqrt, csqrt may give a wrong result if real part of compex argument is zero
  - From: harald dot vogt at desy dot de
- [Bug libfortran/25017] sqrt, csqrt may give a wrong result if real part of compex argument is zero
  - From: fxcoudert at gcc dot gnu dot org

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