Re: bfd_find_nearest_line failure with COFF unsorted line number information

[Chris Chambreau]

Nick,

Just to let you know, I'm still looking into this.  I've found that this is 
also a problem with the IBM VA C/C++ compilers >v5.0.2.5.

-Chris


On Friday 16 May 2003 05:46, Nick Clifton wrote:
> Hi Chris,
>
> > I've built binutils-2.13.2 on a power3 machine with AIX 5.1.  I've
> > noticed that addr2line and calls to bfd_find_nearest_line fail in
> > some cases with applications compiled with IBM VA Fortran compilers
> > versions 7.1 and 8.1.
> >
> > It looks like the coff_find_nearest_line function in bfd/coffgen.c
> > is expecting line number information to be sorted by address.  In
> > the case of these two compilers, I'm seeing line number information
> > that is not sorted.
> >
> > I made the following naive change which seemed to address the
> > problem.
>
> Thank you for reporting this problem.
>
> I am not sure that your solution is the best one however, since in the
> majority of cases, with correct compilers producing sorted linenumber
> information, the patch will mean a significant slowdown in the time it
> takes to lookup line numbers.
>
> A better solution I think would be to add support for a target
> specific line number lookup function which, if provided by the target,
> would be called before the generic code.  This function could be
> defined for AIX 5.1 systems and would handle the unsorted linenumber
> information that their Fortran compilers produce.
>
> Would you like to consider making a patch like this instead ?
>
> There is another problem as well, which is that you do not have an FSF
> binutils copyright assignment on file.  Without such an assignment we
> cannot accept patches from you, much as we might like to.  In case you
> do wish to continue looking into this problem, I am attaching a
> copyright assignment request form at the end of this email.
>
> Cheers
>         Nick
>
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