Hi Christian, On Sat, Feb 18, 2017 at 02:19:52PM +0100, Christian Seiler wrote: [...] > I believe the issue stems from this code in binutils/bfd: > > http://sources.debian.net/src/binutils/2.27.90.20170218-1/bfd/elflink.c/#L9757-L9778 > > The file name at this point is just the argument passed to the linker, > irrespective of whether it's an absolute path or a relative one, and > no prefix is applied at all. > > The initial problem with dietlibc is that on ARM paltforms the > startup code has local symbols in the assembly, which it doesn't > on x86, so the problem has never surfaced on x86 in the past. > > Which means this is a broader class of bugs that every time one > has an assembly file that doesn't contain a ".file" directive > and contains local symbols, ld.bfd will output a FILE entry > which may contain an absolute path of the object file (depending on > how the file name was passed to the linker), which can break > reproducibility. > > > For dietlibc (after Stretch), I can just add .file directives > everywhere, so I can work around this issue. > > But to make sure this doesn't happen at all anymore (there might > be other software with hand-crafted assembly out there that has > similar issues), I believe binutils should also be altered to > support SOURCE_PREFIX_MAP in these cases. > > Unfortunately, I know way too little about the details of binutils > to feel comfortable in creating a patch (it was hard enough to find > the suspected place where the path is injected), so all I can do > here is report my findings. Hopefully someone with more binutils-fu > is able to pick this up.
do you know whether this has been fixed in the recent binutils uploads?
if not maybe you can file these findings as a bug, so they don't get lost
on the mailinglist?
--
cheers,
Holger
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