Patch: Handle relative paths in .debug_line

[Andrew Cagney]

> There were some test suite regressions with the patch. I didn't get a chance to investigate them, yet.

So we don't loose this, would a simple testsuite addition be possible?

Andrew

> Andrew Cagney wrote:
> 
>> Did this get closed / committed?
>>
>>> Bryce McKinlay <mckinlay@redhat.com> writes:
>>>
>>>>> Jim Blandy wrote:
>>>>
>>>>
>>>>
>>>>>> >Almost --- dwarf2_start_subfile still passes comp_dir to concat
>>>>>> >without checking whether it's NULL.
>>>>>> >
>>>>>
>>>>>
>>>>
>>>>> Fixed in the following patch. OK?
>>>>
>>>>
>>>
>>>
>>> Looks better!
>>>
>>> You've done before-and-after runs of the test suite, right?  If there
>>> are no regressions there, please feel free to commit.
>>> Are there any tests currently in the test suite that catch this bug?
>>>
>>>
>>
> 
>