[clang] [Clang][Driver] Revise Cygwin ToolChain to call linker directly (PR #147960)

[Tomohiro Kashiwada via cfe-commits]

kikairoya wrote:

Sorry for causing extra work -- it seems my explanation and investigation weren’t quite sufficient. Thank you for the elaboration.


> ```
> Cannot access memory at address 0x7ff6b4170000
> ```
> 
> 
>     
>   
> 
> Notably, those ending in `0000` are invalid memory.

Might `0x7ff6b4170000` be the image base address? If so, this could be something that needs to be addressed on the LLD side.

That said, I also encountered the same issue with BFD-ld (when building libc++ with @tyan0's patches from cygwin-apps), so I should try to reproduce it again to be sure. It may take a few days to rebuild and investigate...


https://github.com/llvm/llvm-project/pull/147960