dblaikie added a comment.

In D152017#4400735 <https://reviews.llvm.org/D152017#4400735>, @probinson wrote:

> Oh, `-fstandalone-debug` should override this? In the Sony implementation, it 
> does. (Sorry for not remembering that sooner.)

I'd think of this as orthogonal to that, potentially. by analogy with 
non-member functions. Even in standalone debug, we wouldn't emit a declaration 
for every function declared in a translation unit. Ah, because we include the 
mangled names on member function declarations, having that would still allow 
you to call the function from another translation unit, if it's available, even 
without DWARF for that TU, I suppose.

So, while it's inconsistent with non-member functions, which doesn't seem like 
a good principle - yeah, guess we could imply this option is disabled by 
`-fstandalone-debug`...

In D152017#4400449 <https://reviews.llvm.org/D152017#4400449>, @rnk wrote:

> I tend to think that enabled-by-default options which have names that you are 
> supposed to prefix with no are awkward[1], but the compiler ecosystem (GCC & 
> Clang) has lots of those, and perhaps we should lean into it. I like 
> `-g[no-]undefined-methods` the best of Paul's suggestions.
>
> [1]  `-fdelete-null-pointer-checks`, anyone? Yes, that's a feature I want in 
> my compiler, please delete my null checks, I didn't need those, sign me up!

Yeah, mixed feelings about a default-on flag, so you have to use `-gno-*`. 
Though one name in that form, might be `-gno-canonical-types`.
(pedantically C++ calls these things "member functions" (& it seems nice to use 
consistent naming) rather than "methods", but 
`-g[no-]undefined-member-functions` would be a bit of a mouthful... )


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