[compiler-rt] [compiler-rt] Add version info to Windows runtime DLLs (PR #216408)

[Reid Kleckner via llvm-commits]

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@@ -24,6 +25,65 @@ function(set_target_output_directories target output_dir)
   endif()
 endfunction()
 
+function(add_compiler_rt_windows_version_resource_file OUT_VAR RESOURCE_VAR name)
+  set(sources ${ARGN})
+  if(MSVC AND CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
+    set(resource_file)
+    foreach(candidate_resource_file IN ITEMS
+        "${LLVM_SOURCE_DIR}/resources/windows_version_resource.rc"
+        "${LLVM_MAIN_SRC_DIR}/resources/windows_version_resource.rc"
+        "${LLVM_MAIN_SRC_DIR}/llvm/resources/windows_version_resource.rc")
+      if(EXISTS "${candidate_resource_file}")
+        set(resource_file "${candidate_resource_file}")
+        break()
+      endif()
+    endforeach()
+
+    if(resource_file)
+      set(target_resource_file
+        "${CMAKE_CURRENT_BINARY_DIR}/${name}_windows_version_resource.rc")
+      configure_file("${resource_file}" "${target_resource_file}" COPYONLY)
+      list(APPEND sources "${target_resource_file}")
+      source_group("Resource Files" "${target_resource_file}")
+      set(${RESOURCE_VAR} "${target_resource_file}" PARENT_SCOPE)
+    endif()
+  endif()
+  set(${OUT_VAR} ${sources} PARENT_SCOPE)
+endfunction()
+
+function(set_compiler_rt_windows_version_resource_properties name resource_file)
+  if(DEFINED LLVM_VERSION_MAJOR)
----------------
rnk wrote:

No action required: It's a crime that cmake doesn't have a utility like:
```
set_with_default(destvar srcvar "default, 0")
```

https://github.com/llvm/llvm-project/pull/216408