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Subject:	Re: cygwin qsort erratic
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From:	Kurt-Karen Carlson-Lougheed via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Kurt-Karen Carlson-Lougheed <denalisun907 AT gmail DOT com>
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--000000000000f3f0e405ae30085b
Content-Type: text/plain; charset="UTF-8"

Brian,
It's difficult to produce a simple test case with erratic behavior. I have
wrapped my qsort invocations within a qqsort routine. I've attached
qqsort.h which includes both the wrapper and the netbad qsort.c renamed as
Qsort (and with _DIAGASSERT's commented out). Also attached is cygsort.txt
which is script output demonstrating the problem. My apologies that is 200+
lines, the Verbose mode states whether Qsort (netbsd) or qsort (cygwin) is
being invoked, I added the '$' command to toggle back and forth. Descending
sorts on the D/C (dpc) column have been most problematic. The descending
'+S dpc' after the ascending '+s dpc' is the most graphic example. I did
publish uac19 v3.3 on SourceForge this morning, or I can send somebody a
tgz.

Corinna,
I'm a cygwin user and neither a cygwin nor netbsd developer. I do not know
what newlib or 'git format-patch' are. If I had access to source for
cygwin's qsort  I could probably devise a patch, but it's probably better
for somebody familiar with the tools cygwin uses to do that. The attached
qqsort.h is an easy geek read. That qsort works with Linux/RHEL7 and with
netbsd's version under cygwin should make fixing it straight forward for
somebody in the know.

Regards, Kurt

On Sun, Aug 30, 2020 at 7:55 PM Brian Inglis <
Brian DOT Inglis AT systematicsw DOT ab DOT ca> wrote:

> On 2020-08-30 15:27, Kurt-Karen Carlson-Lougheed via Cygwin wrote:
> > In a small percentage of qsort requests, the results are erratic. Running
> > the same code under Linux (RHEL7) does NOT have this problem. I updated
> my
> > cygwin to current and the problem persists. I copied the latest
> netbsd.org
> > qsort.c and compiled into my code, the problem is resolved with that
> > version of qsort.
> >
> > In researching this issue, there was a post to this list 2015-01-11
> > reporting a
> > 'damaged' qsort. This may still be the same issue. The netbsd version I
> am
> > now using is dated 2017-05-19.
> >
> > My code experiencing this is SourceForge uac19, I'll be posting the
> > corrected version (v3.2) with the netbsd qsort tomorrow after completing
> > validation tests. I would ultimately like to see cygwin's qsort fixed.
>
> As qsort depends on the array object data types and comparison functions,
> please
> post a Simple Test Case, showing at least those types and function(s), and
> the
> faulty output results.
>
> --
> Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
>
> This email may be disturbing to some readers as it contains
> too much technical detail. Reader discretion is advised.
> [Data in IEC units and prefixes, physical quantities in SI.]
> --
> Problem reports:      https://cygwin.com/problems.html
> FAQ:                  https://cygwin.com/faq/
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