[clang] [compiler-rt] [llvm] Get the linker version and pass the it to compiler-rt tests on Darwin. (PR #86220)

[Julian Lettner via cfe-commits]

================
@@ -346,20 +347,7 @@ endif ()
 # Determine HOST_LINK_VERSION on Darwin.
 set(HOST_LINK_VERSION)
 if (APPLE AND NOT CMAKE_LINKER MATCHES ".*lld.*")
-  set(LD_V_OUTPUT)
-  execute_process(
-    COMMAND sh -c "${CMAKE_LINKER} -v 2>&1 | head -1"
-    RESULT_VARIABLE HAD_ERROR
-    OUTPUT_VARIABLE LD_V_OUTPUT
-  )
-  if (HAD_ERROR)
-    message(FATAL_ERROR "${CMAKE_LINKER} failed with status ${HAD_ERROR}")
-  endif()
-  if ("${LD_V_OUTPUT}" MATCHES ".*ld64-([0-9.]+).*")
-    string(REGEX REPLACE ".*ld64-([0-9.]+).*" "\\1" HOST_LINK_VERSION ${LD_V_OUTPUT})
-  elseif ("${LD_V_OUTPUT}" MATCHES "[^0-9]*([0-9.]+).*")
-    string(REGEX REPLACE "[^0-9]*([0-9.]+).*" "\\1" HOST_LINK_VERSION ${LD_V_OUTPUT})
-  endif()
+  get_darwin_linker_version()
----------------
yln wrote:

- [ ]  Would it be possible to "declare" where the value is stored, i.e., a CMAKE output parameter?  So the relationship between `HOST_LINK_VERSION` and `get_darwin_linker_version()` is explicit (and other variable names can be used)?
```suggestion
  get_darwin_linker_version(HOST_LINK_VERSION)
```



https://github.com/llvm/llvm-project/pull/86220