[lldb-dev] Acceptance of dwarf2/3 suggested form of DW_AT_comp_dir

Matthew Gardiner mg11 at csr.com
Thu Aug 21 22:39:45 PDT 2014

Greg Clayton wrote:
> On Aug 21, 2014, at 4:23 AM, Matthew Gardiner <mg11 at csr.com> wrote:
>> Apologies for me getting noisy on this thread.
>> However, I don't think it's possible to work around toolchains that adopt the DWARF2/3 suggested form. The problem occurs if lldb wants to support debugging ELFs produced on different hosts - i.e. if the producer and consumers of the DWARF are either POSIX/Windows. We could then have a situation where a comp_dir string is something like:
>> c:/home/source
> Actually I think you will be ok because it will be:
> c:\home\source  for windows...

Ok, that's a pretty easy check to make first (i.e. single letter, :, 
then back-slash). Presumably if a windows toolchain uses / instead of \ 
then it's badly broken.

Adding zturner, if he should care to comment on the windows path.

>> in this case, we cannot determine whether c is a drive-letter or a hostname.
>> (So, I think we'll be changing our toolchain accordingly :-)
>> However, if anyone has any opinions on this DWARF2/3 debate I'd be interested in hearing them.
> Feel free to modify the DWARF parser to strip off the leading hostname to get things fixed and working. If it is part of the older _or_ current spec, we should support it in LLDB.

No problem. I'll massage my current local change, to include the windows 
path check, then get it submitted.


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