vbvictor wrote:

> Actually, the cxxRecordDecl might not be in a macro, but the special member 
> functions are.

The checker doc states:
`The check finds classes where some but not all of the special member functions 
are defined.`
I think we only need to ignore if the whole class expands from macro. If not, I 
don't see a reason why a user can't provided needed members.

> I'd prefer to see a warning for expansions of macros defined inside the code 
> base

I think we could just limit the scope of the whole check by 
`unless(isExpansionInSystemHeader())`.
There was some work by [carlosgalvezp](https://github.com/carlosgalvezp) to 
ignore system headers in all checks by default so maybe this addition will 
become obsolete soon.

> I'm +- on the default

FYI there are total of 22 checks that use `IgnoreMacros` option, 17 of them 
have `true` by default and 5 have `false`


https://github.com/llvm/llvm-project/pull/143550
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