compile warning Clang 11 on C++

[gvollant]

I have these warnings

google/protobuf/compiler/cpp/cpp_helpers.cc:173:6: warning: function 'Base63Char' is not needed and will not be emitted [-Wunneeded-internal-declaration]

char Base63Char(int value) {

     ^

  CXX      google/protobuf/compiler/java/java_enum.lo

1 warning generated.

 

 

google/protobuf/compiler/js/js_generator.cc:97:6: warning: unused function 'StrEndsWith' [-Wunused-function]

bool StrEndsWith(StringPiece sp, StringPiece x) {

     ^

1 warning generated.

 

 

 

In file included from google/protobuf/compiler/csharp/csharp_source_generator_base.cc:39:

./google/protobuf/compiler/csharp/csharp_source_generator_base.h:62:25: warning: private field 'descriptor_' is not used [-Wunused-private-field]

  const FileDescriptor* descriptor_;

                        ^

1 warning generated.