mgorny added a comment.

In https://reviews.llvm.org/D25402#566070, @joerg wrote:

> It's difficult to say whether if one change to certain driver functions 
> affect some target or not. That's one reason why the test change is so 
> important.
>
> Looking at the latest version, I still don't understand why the change for 
> Linux is needed. libc++ should provide a linker script now and that should 
> include -lunwind as appropriate.


Most importantly, the linker script can't predict which -rtlib will be used and 
therefore whether -lgcc_s or -lunwind should be used.


https://reviews.llvm.org/D25402



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