PATCH: read stabs from files with no .data section

[Jim Blandy]

Andrew Cagney <ac131313@redhat.com> writes:

> > Andrew Cagney <ac131313@redhat.com> writes:
> >
> >> > +   /* If the objfile has no .data section, try using the .bss section.  */
> >> > +   data_sect_index = objfile->sect_index_data;
> >> > +   if (data_sect_index == -1)
> >> > +     data_sect_index = SECT_OFF_BSS (objfile);
> >> > +   gdb_assert (data_sect_index != -1);
> >> > +
> >
> >> So what happens if there is no .data and no .bss?
> > We lose.  Maybe this should fall through the .rodata, and then .text
> > section offsets, but I think it's still papering over the real
> > problem, which I don't know how to solve.
> > I think the correct behavior is to use the offset of the section
> > containing the variable.  Many of the old references to
> >   ANOFFSET (objfile->section_offsets, SECT_OFF_DATA (objfile))
> > that this patch changes were wrong, for this reason.
> > But to do the right thing, we'd need to look up the section by the
> > variable's unrelocated address, as with find_pc_section.  This would
> > be needed for every top-level variable, static and global, in the
> > speed-critical partial symtab construction pass.  I'm not sure that
> > kind of overhead would be welcome.
> 
> Ah.  Suggest adding a fixme describing this real problem to the code,
> and filing a bug report.

Okay, will do.

The code should also try sect_index_rodata too, before giving up.