petrhosek wrote:

I'd actually prefer this not be merged as is. I have already made a similar 
change locally but during testing I discovered a major issue with 
`check_linker_flag`: unlike other CMake `check_*` functions, and even 
`llvm_check_linker_flag`, `check_linker_flag` doesn't apply 
`CMAKE_REQUIRED_LINK_OPTIONS` because [the implementation overrides 
it](https://gitlab.kitware.com/cmake/cmake/-/blob/14de6802e40edcdeebc73d81210fe8e1ec0f469e/Modules/Internal/CheckLinkerFlag.cmake#L25)
 and this can result in failed checks when `CMAKE_REQUIRED_LINK_OPTIONS` 
contains necessary flags (it actually breaks the runtimes build which this 
change doesn't touch). I'd rather prefer to continue using 
`llvm_check_linker_flag` with our own implementation [similar to the CMake 
one](https://gitlab.kitware.com/cmake/cmake/-/blob/14de6802e40edcdeebc73d81210fe8e1ec0f469e/Modules/Internal/CheckLinkerFlag.cmake)
 that appends `CMAKE_REQUIRED_LINK_OPTIONS` rather than overwriting it. If you 
want to implement such a change, that would be great, otherwise I can take a 
stab at it when I have some time.

https://github.com/llvm/llvm-project/pull/86602
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