[llvm] [llvm-config] Fix system library names for MSVC (PR #222301)

[via llvm-commits]

================
@@ -1,17 +1,23 @@
 # Returns library name for a given path.
 function(get_library_name path name)
-  get_filename_component(path ${path} NAME)
-  set(prefixes ${CMAKE_FIND_LIBRARY_PREFIXES})
-  set(suffixes ${CMAKE_FIND_LIBRARY_SUFFIXES})
-  list(FILTER prefixes EXCLUDE REGEX "^\\s*$")
-  list(FILTER suffixes EXCLUDE REGEX "^\\s*$")
-  if(prefixes)
-    string(REPLACE ";" "|" prefixes "${prefixes}")
-    string(REGEX REPLACE "^(${prefixes})" "" path ${path})
-  endif()
-  if(suffixes)
-    string(REPLACE ";" "|" suffixes "${suffixes}")
-    string(REGEX REPLACE "(${suffixes})$" "" path ${path})
+  get_filename_component(path "${path}" NAME)
+  if(MSVC)
+    # MSVC library names retain the "lib" prefix. Only remove the extension;
+    # llvm-config adds the .lib suffix.
+    get_filename_component(path "${path}" NAME_WLE)
+  else()
----------------
zhangweize9-cyber wrote:

That's interesting, this approach resolves the boundary cases of the `MSVC` instruction set.

https://github.com/llvm/llvm-project/pull/222301