jyknight added a comment.

In D122983#3454406 <https://reviews.llvm.org/D122983#3454406>, @aaron.ballman 
wrote:

> In D122983#3452994 <https://reviews.llvm.org/D122983#3452994>, @rsmith wrote:
>
>> I think we should just make this an error by default in C99 onwards;
>
> Out of curiosity -- do you think we should remove the `DefaultIgnore` in C89 
> mode so that we warn by default there (perhaps as a follow up)? Also, I 
> presume you expect `diag::ext_implicit_lib_function_decl` to behave the same 
> way (warn in C89, warn-as-err in C99 and up) as part of this patch?

I'm not sure what purpose it'd serve to change -std=c89 to be more strict at 
this point. It's not the default compilation mode, and the code is actually 
valid under that standard. IMO, adding such a on-by-default warning there would 
only serve to annoy folks explicitly trying to build super-old code with a 
super-old standards version.


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https://reviews.llvm.org/D122983

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