fix(cpn): llvm clang dll filename change breaking libsimulator builds (#4775)

Author: pfeerick

radio/util/find_clang.py

@@ -4,6 +4,7 @@
 #
 import os
 import sys
+import re
 
 from clang.cindex import *
 
@@ -82,12 +83,20 @@ def findLibClang():
     else:
         # Unsupported platform
         return None
-        
+
     for path in knownPaths:
         # print("trying " + path)
         if os.path.exists(path + "/libclang" + libSuffix):
             return path
-
+        elif (sys.platform == "win32" or sys.platform == "msys"):
+            # Check for versioned and non-versioned libclang.dll if on msys
+            pattern = re.compile(r'^libclang(-\d+(\.\d+)?)?\.dll$')
+            if os.path.exists(path):
+                for filename in os.listdir(path):
+                    if pattern.match(filename):
+                        return os.path.join(path, filename)
+
+    # If no known path is found
     return None
 
 def initLibClang():
@@ -100,13 +109,16 @@ def initLibClang():
             Config.set_library_path(library_path)
         else:
             Config.set_library_file(library_path)
+    else:
+        print("WARN  (find_clang): libclang path not found", file=sys.stderr)
 
     Config.set_compatibility_check(False)
 
     try:
         index = Index.create()
     except Exception as e:
-        print("ERROR: could not load libclang from '%s'." % library_path, file=sys.stderr)
+        print("ERROR (find_clang): could not load libclang from '%s'." % library_path, file=sys.stderr)
+        print("                  : detected platform '%s'" % sys.platform, file=sys.stderr)
         return False
 
     global builtin_hdr_path