Re: compiling development sources

[Carlo de Falco]

On 11 Feb 2010, at 12:50, Jaroslav Hajek wrote:

> It's surely worth trying, although as I said, not a single line of
> code in the library routines has changed since 1.1.0, it's just the
> test suite, so in theory the binary should be identical to 1.1.0.
> Compared to 1.0, only 8 new routines were added. If you start seeing
> the test failures in Octave again, try rebuilding and re-running the
> qrupdate test suite. For me, the manifestation of the bug seemed to be
> dependent on previous calls to BLAS made, and it apparently made a
> difference whether the BLAS remained in memory or not.
> In any case, it will help if you discover which test was failing for  
> you:
> ./run-octave
> octave:1> test qr verbose
>
> this should dump the tests as they're tried so you'll see which one  
> crashed.

As I mentioned in a previous post, I could reproduce the segfault in  
Octave
with the following test from the qrupdate testsuite:

> Ac = [0.620405 + 0.956953i  0.480013 + 0.048806i  0.402627 +  
> 0.338171i;
>      0.589077 + 0.658457i  0.013205 + 0.279323i  0.229284 + 0.721929i;
>      0.092758 + 0.345687i  0.928679 + 0.241052i  0.764536 + 0.832406i;
>      0.912098 + 0.721024i  0.049018 + 0.269452i  0.730029 + 0.796517i;
>      0.112849 + 0.603871i  0.486352 + 0.142337i  0.355646 +  
> 0.151496i ];
>
>  uc = [0.20351 + 0.05401i;
>      0.13141 + 0.43708i;
>      0.29808 + 0.08789i;
>      0.69821 + 0.38844i;
>      0.74871 + 0.25821i ];
>
>  vc = [0.85839 + 0.29468i;
>      0.20820 + 0.93090i;
>      0.86184 + 0.34689i ];
>
>
>  [Q,R] = qr(Ac);
>  [Q,R] = qrupdate(Q,R,uc,vc);

and the result was

> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: 13 at address: 0x00000000
> 0x8fe18c02 in __dyld_misaligned_stack_error ()
> (gdb)

a similar test with real data gives no problem.

the test above was carried out with an Octave build linked to qrupdate  
1.1.0
I nothing has changed in the library code in 1.1.1 I don't expect  
things to
be different with th new version.

For the time being I will therefore build with --without-qrupdate to  
proceed,
but if there is any more useful tests I can run to try debug this,  
please let me know.

Carlo