Re: working with split debug files and sectionless ELFs

Mike Frysinger
2011-10-14T17:34:03Z

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On Friday 14 October 2011 13:25:08 Jan Kratochvil wrote:
> On Fri, 14 Oct 2011 19:05:46 +0200, Mike Frysinger wrote:
> > build-id is a section. my ELF has no sections. i'm back where i started
> > :).
>
> build-id is in a note being both a section and a segment. GDB currently
> reads it as a section but this can be changed.
>
> Program Headers:
> Type Offset VirtAddr PhysAddr FileSiz
> MemSiz Flg Align [...]
> NOTE 0x000254 0x0000000000400254 0x0000000000400254 0x000044
> 0x000044 R 0x4 [...]
> Notes at offset 0x00000274 with length 0x00000024:
> Owner Data size Description
> GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)
>
> It was designed by Roland McGrath exactly this way so that in all cases of
> debug info stripping build-id remains in the main executable. Otherwise
> build-id would be useless.

ah, wasn't aware of it also being in the program headers. yes, i should be
able to leverage this, once we fix gdb to fall back to the program header when
the section isn't found.
-mike

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