nickdesaulniers added a comment.

In D102742#2773954 <https://reviews.llvm.org/D102742#2773954>, @tejohnson wrote:

> In D102742#2767569 <https://reviews.llvm.org/D102742#2767569>, 
> @nickdesaulniers wrote:
>
>> Obviously needs work/cleanup, changes to x86, and tests, but posting for 
>> early feedback about module level attributes vs function level attributes, 
>> or possibly something else.  I tested this quickly with thin LTO of the 
>> Linux kernel and it worked.
>
> I haven't looked through in too much detail, but I see you have the module 
> flag type set as Warning on conflict. I guess the answer to module level vs 
> function level depends on whether it is valid to link together files compiled 
> with different values of these flags and if so what the expected behavior 
> should be. How does this work on non-LTO? If it works just fine, i.e. the 
> functions from the modules with one value are compiled ok with that value and 
> linked with functions compiled effectively with another value, then that 
> would point to a function attribute so you can mimic the mix-and-match 
> behavior. If it is unexpected, then perhaps better to keep as a module flag 
> but Error? With Warning, the value from the first module being linked is used 
> - would that be surprising?

Good point; it won't work as intended on mismatch. Let me upgrade that to Error.


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https://reviews.llvm.org/D102742

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