MaskRay added a comment.

In D105169#3321237 <https://reviews.llvm.org/D105169#3321237>, @hyeongyukim 
wrote:

> In D105169#3319773 <https://reviews.llvm.org/D105169#3319773>, @dblaikie 
> wrote:
>
>> In D105169#3315009 <https://reviews.llvm.org/D105169#3315009>, @MaskRay 
>> wrote:
>>
>>> It may not be worth changing now, but I want to mention: it's more 
>>> conventional to have a `BoolOption` which adds `-[no-]noundef-analysis`. 
>>> Since both positive and negative forms exist. When we make the default 
>>> switch, existing users don't need to change the option. After the option 
>>> becomes quite stable and the workaround is deemed not useful, we can remove 
>>> the CC1 option.
>>
>> +1 to this (changing the name and the default at the same time makes 
>> migrations a bit more difficult - if the default is changed without renaming 
>> (by having both positive and negative flag names) then users can adopt their 
>> current default explicitly with no change ahead of picking up the patch that 
>> changes the default) & also this flag seems to have no tests? Could you 
>> (@hyeongyukim ) add some frontend test coverage for the flag - and yeah, 
>> maybe consider giving it a name that has both explicit on/off names, as 
>> @maskray suggested? (I think that's useful even after the default switch - 
>> since a user might want to override a previous argument on the command line, 
>> etc)
>
> Sure, I'll add some tests.
> By the way, is it right to change the flag's name to 
> `-[no-]enable-noundef-analysis`? or would it be better to use 
> `-[no-]noundef-analysis` as @MaskRay suggested?
> I prefer to use `-[no-]enable-noundef-analysis` to maintain backward 
> compatibility.

For driver and CC1 options, the convention of boolean options is to use 
`[no-]`, not use `enable-` or `disable-`.
That said, `-[no-]enable-noundef-analysis` sounds good to me since 
`no-noundef-analysis` may be odd and `-enable-noundef-analysis` maintains 
backward compatibility.


Repository:
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https://reviews.llvm.org/D105169

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