[tools] Add Python 3 compatibility patch (#5825)

tools/iar.py

@@ -190,7 +190,7 @@ def IARVersion():
 
         return path
 
-    path = IARPath();
+    path = IARPath()
 
     if os.path.exists(path):
         cmd = os.path.join(path, 'iccarm.exe')
@@ -200,7 +200,8 @@ def IARVersion():
 
     child = subprocess.Popen([cmd, '--version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
     stdout, stderr = child.communicate()
-
+    if not isinstance(stdout, str):
+        stdout = str(stdout, 'utf8') # Patch for Python 3
     # example stdout: IAR ANSI C/C++ Compiler V8.20.1.14183/W32 for ARM
     iar_version = re.search('[\d\.]+', stdout).group(0)
     if GetOption('verbose'):

tools/mkromfs.py

@@ -191,7 +191,7 @@ class Folder(object):
             else:
                 assert False, 'Unkown instance:%s' % str(c)
 
-            name = bytes(c.bin_name)
+            name = bytes(c.bin_name.encode('utf-8'))
             name_addr = v_len
             v_len += len(name)
 
@@ -200,7 +200,7 @@ class Folder(object):
             # pad the data to 4 bytes boundary
             pad_len = 4
             if len(data) % pad_len != 0:
-                data += '\0' * (pad_len - len(data) % pad_len)
+                data += ('\0' * (pad_len - len(data) % pad_len)).encode('utf-8')
             v_len += len(data)
 
             d_li.append(self.bin_fmt.pack(*self.bin_item(
@@ -232,7 +232,7 @@ const struct romfs_dirent {name} = {{
 
 def get_bin_data(tree, base_addr):
     v_len = base_addr + Folder.bin_fmt.size
-    name = bytes('/\0\0\0')
+    name = bytes('/\0\0\0'.encode("utf-8"))
     name_addr = v_len
     v_len += len(name)
     data_addr = v_len