idf_monitor: Demangle C++ names

docs/get-started/idf-monitor.rst

@@ -56,7 +56,7 @@ idf_monitor will augment the dump::
 
 Behind the scenes, the command idf_monitor runs to decode each address is::
 
-  xtensa-esp32-elf-addr2line -pfia -e build/PROJECT.elf ADDRESS
+  xtensa-esp32-elf-addr2line -pfiaC -e build/PROJECT.elf ADDRESS
 
 
 Launch GDB for GDBStub

tools/idf_monitor.py

@@ -395,7 +395,7 @@ class Monitor(object):
     def lookup_pc_address(self, pc_addr):
         translation = subprocess.check_output(
             ["%saddr2line" % self.toolchain_prefix,
-             "-pfia", "-e", self.elf_file, pc_addr],
+             "-pfiaC", "-e", self.elf_file, pc_addr],
             cwd=".")
         if not "?? ??:0" in translation:
             yellow_print(translation)