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Re: VMA section overlap warnings for overlays
Alan Modra <amodra@gmail.com> writes:
> On Fri, Jul 16, 2010 at 09:39:16AM +0200, Andreas Schwab wrote:
>> "H.J. Lu" <hjl.tools@gmail.com> writes:
>>
>> > Why does an empty section affect section layout?
>>
>> ??? That's the bug.
>
> I think we could probably remove all the sh_size != 0 tests associated
> with ELF_SECTION_IN_SEGMENT in elf.c. I'm not sure why they were
> there in the first place, possibly to cover bugs in the precursors to
> ELF_SECTION_IN_SEGMENT.
ELF_SECTION_SIZE is also weird. It returns 0 for a .tbss section
outside a TLS segment, but that makes it impossible to distinguish it
from a genuine empty section. There are two uses of ELF_SECTION_SIZE
together with ELF_SECTION_IN_SEGMENT, which are in readelf.c end
elf32-spu.c. Thus readelf -l never considers an empty section be part
of any segment, but removing the ELF_SECTION_SIZE check causes the .tbss
section to be mishandled. I think ELF_SECTION_IN_SEGMENT_1 should be
modified to handle the special case of .tbss directly.
Andreas.
--
Andreas Schwab, schwab@redhat.com
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