[llvm-dev] [ThinLTO] Using two different IRMovers for the same composite module? (related to PR28180)

Taewook Oh via llvm-dev llvm-dev at lists.llvm.org
Fri Jul 22 16:42:40 PDT 2016

It seems that the patch works for me as well, though the linker crashes with another error after that. Thanks!

Mehdi, I couldn’t quite understand what do you mean by you don’t have a repro so you couldn’t upstream the patch. Aren’t .ll files you attached sufficient to submit along with the patch? If there is anything I can help you to upstream it, please let me know. 

-- Taewook

On 7/22/16, 2:52 PM, "mehdi.amini at apple.com on behalf of Mehdi Amini" <mehdi.amini at apple.com> wrote:

> On Jul 22, 2016, at 2:47 PM, Davide Italiano <davide at freebsd.org> wrote:
> On Fri, Jul 22, 2016 at 2:44 PM, Davide Italiano <davide at freebsd.org> wrote:
>> On Fri, Jul 22, 2016 at 2:34 PM, Taewook Oh via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>>> Yes, I have the repro, though I can’t publish it externally. It would be
>>> great if you can upstream the patch so I can try it. Thank you for your
>>> explanation as well!
>> There's a reproducer attached (obtained via lld --reproduce option).
>> If that doesn't work, you can checkout mozjs and try to reduce from
>> there.
>> It happens while doing an LTO build with lld.
>> I have a fix for that (Mehdi has one as well, apparently) in my local
>> tree, but I don't have time to reduce. If you can take care of that,
>> chances are that an upstream fix will be committed shortly after.
> Just to clarify, I'm talking about the issue in PR28180. I can't
> comment about the ThinLTO one, sorry.

If lld is setting enableDebugTypeODRUniquing(); on the context and isn’t using the IRMover to target an empty module, it can be the same bug.
I mentioned that it should touch only ThinLTO but I had ld64 in mind.


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