Check fails on cygwin, gcc 4.1.1

Synposis:
MPZ; 1 of 56 tests failed; t-export

Log files:



-- 
Oliver Jennrich                                    Tel: 
+31-71-565-6074
LISA Project Scientist                            
ESA/ESTEC, Keplerlaan 1, Postbus 299, 2200 AG Noordwijk, The
Netherlands

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Oliver Jennrich wrote:
>

Hello Oliver

Just to be clear: the gmp version is 4.2.1, not 4.1.1, so my
suggestion to
try the current release is moot. The gcc you used is gcc
4.1.1 and your
Cygwin install is roughly 7 months old. Could you try with
current Cygwin?

> Synposis:
> MPZ; 1 of 56 tests failed; t-export
>
> Log files:
>

Is this reproducible?

Cheers,

Michael

>
> --
> Oliver Jennrich                                    Tel:
 +31-71-565-6074
> LISA Project Scientist
> ESA/ESTEC, Keplerlaan 1, Postbus 299, 2200 AG
Noordwijk, The Netherlands
> _______________________________________________
> gmp-bugs mailing list
> gmp-bugsswox.com
> http://swox
.com/mailman/listinfo/gmp-bugs
>


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Oliver Jennrich wrote:
> Michael Abshoff <Michael.Abshofffsmath.mathematik.uni-dortmund.de>
> writes:
>
>> Oliver Jennrich wrote:
>>>

Hello,

>>
>> Hello Oliver
>>
>> Just to be clear: the gmp version is 4.2.1, not
4.1.1, so my suggestion
>> to
>> try the current release is moot. The gcc you used
is gcc 4.1.1 and your
>> Cygwin install is roughly 7 months old. Could you
try with current
>> Cygwin?
>
> It is not quite clear what you mean with a current
cygwin.  2007-01-31
> is the date of the most recent cygwin.dll, and this,
I'm afraid, the
> most recent available.

That is correct regarind the latest official release, but
you can install
daily snapshots. Because the last release is 6 months it
might have been
worth a try.

> gcc of course is *not* the actual cygwin compiler, as
this is still on
> 3.4.4.
>
> Anyway, I tried to find the source of the problem and
it seems that
>
> int memcmp(const void *S1, const void *S2, size_t N);
>
> returns a '1' even if N=0, which should not happen.
>
> The problem goes away, however, if I turn down the
level of
> optimization, i.e. calling gcc with -O3 reproduces the
problem,
> calling it with -O2 shows no problem at all, so I
assume a problem
> with loop unrolling.
>

Intersting.

> So it seems to be a bug (or at least a very odd
behaviour) of gcc, so
> I will report it there...
>
>

Cheers,

Michael

> --
> Oliver Jennrich                                    Tel:
 +31-71-565-6074
> LISA Project Scientist
> ESA/ESTEC, Keplerlaan 1, Postbus 299, 2200 AG
Noordwijk, The Netherlands
>


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Michael Abshoff <Michael.Abshofffsmath.mathematik.uni-dortmund.de>
writes:

> Oliver Jennrich wrote:
>>
>
> Hello Oliver
>
> Just to be clear: the gmp version is 4.2.1, not 4.1.1,
so my suggestion to
> try the current release is moot. The gcc you used is
gcc 4.1.1 and your
> Cygwin install is roughly 7 months old. Could you try
with current Cygwin?

It is not quite clear what you mean with a current cygwin. 
2007-01-31
is the date of the most recent cygwin.dll, and this, I'm
afraid, the
most recent available.

gcc of course is *not* the actual cygwin compiler, as this
is still on
3.4.4.

Anyway, I tried to find the source of the problem and it
seems that

int memcmp(const void *S1, const void *S2, size_t N);

returns a '1' even if N=0, which should not happen.

The problem goes away, however, if I turn down the level of
optimization, i.e. calling gcc with -O3 reproduces the
problem,
calling it with -O2 shows no problem at all, so I assume a
problem
with loop unrolling.

So it seems to be a bug (or at least a very odd behaviour)
of gcc, so
I will report it there...


-- 
Oliver Jennrich                                    Tel: 
+31-71-565-6074
LISA Project Scientist                            
ESA/ESTEC, Keplerlaan 1, Postbus 299, 2200 AG Noordwijk, The
Netherlands
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