[llvm] r233165 - Linker: Temporarily disable dwarfdump checks from r233164

[Duncan P. N. Exon Smith]

> On 2015-Mar-25, at 10:24, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
> 
>> 
>> On 2015-Mar-25, at 10:12, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
>> 
>> Good point, I guess I'm not being very creative :/.  Peter also obliged
>> [1] my request for a dump on Linux, which I've reproduced locally by
>> specifying -mtriple=x86_64-unknown-linux.  What's going wrong is the
>> second compile unit is missing the subprogram for the weak ("winning")
>> function.
>> 
>> [1]: https://llvm.org/bugs/show_bug.cgi?id=22792#c7 "Output on Linux"
>> 
>> This DWARF is wrong, right?  (I.e., are the expected differences in
>> debug info between Linux and Darwin all in the frontend generation
>> logic?)
> 
> Just talked to Adrian offline; answer is "yes".  I'll see if I can figure
> this out and just revert r233165.

Interestingly, in assembly both darwin and linux are "missing" things.

On darwin, we get the subprogram for the smaller compile unit, but not
the compile unit.

On linux, we get the smaller compile unit, but no subprogram.

Attaching assembly in case this is obvious to someone.  About to start
debugging it myself though.

darwin1.a and linux1.a were generated from the LW testcase (linkonce
version of @foo before weak version of @foo), while darwin2.a and
linux2.a were generated from the WL testcase (weak version first).

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