Removed a number of compiler warnings.

cores/arduino/Print.cpp

@@ -264,3 +264,33 @@ size_t Print::printFloat(double number, uint8_t digits)
 
   return n;
 }
+
+size_t Print::printf(const char *format, ...)
+{
+  char loc_buf[64];
+  char* temp = loc_buf;
+  va_list arg;
+  va_list copy;
+  va_start(arg, format);
+  va_copy(copy, arg);
+  int len = vsnprintf(temp, sizeof(loc_buf), format, copy);
+  va_end(copy);
+  if (len < 0) {
+    va_end(arg);
+    return 0;
+  }
+  if (len >= (int)sizeof(loc_buf)) {
+    temp = (char*)malloc(len + 1);
+    if (temp == NULL) {
+      va_end(arg);
+      return 0;
+    }
+    len = vsnprintf(temp, len + 1, format, arg);
+  }
+  va_end(arg);
+  len = write((uint8_t*)temp, len);
+  if (temp != loc_buf) {
+    free(temp);
+  }
+  return len;
+}

cores/arduino/Print.h

@@ -74,6 +74,8 @@ class Print
     size_t print(double, int = 2);
     size_t print(const Printable&);
 
+    size_t printf(const char * format, ...)  __attribute__ ((format (printf, 2, 3)));
+
     size_t println(const __FlashStringHelper *);
     size_t println(const String &s);
     size_t println(const char[]);

cores/arduino/new.cpp

@@ -56,7 +56,7 @@ void * operator new[](std::size_t size) {
   return operator new(size);
 }
 
-void * operator new(std::size_t size, const std::nothrow_t tag) noexcept {
+void * operator new(std::size_t size, const std::nothrow_t) noexcept {
 #if defined(NEW_TERMINATES_ON_FAILURE)
   // Cannot call throwing operator new as standard suggests, so call
   // new_helper directly then
@@ -65,7 +65,7 @@ void * operator new(std::size_t size, const std::nothrow_t tag) noexcept {
   return operator new(size);
 #endif
 }
-void * operator new[](std::size_t size, const std::nothrow_t& tag) noexcept {
+void * operator new[](std::size_t size, const std::nothrow_t&) noexcept {
 #if defined(NEW_TERMINATES_ON_FAILURE)
   // Cannot call throwing operator new[] as standard suggests, so call
   // malloc directly then
@@ -100,10 +100,10 @@ void operator delete[](void * ptr, std::size_t size) noexcept {
 }
 #endif // __cplusplus >= 201402L
 
-void operator delete(void* ptr, const std::nothrow_t& tag) noexcept {
+void operator delete(void* ptr, const std::nothrow_t&) noexcept {
   operator delete(ptr);
 }
-void operator delete[](void* ptr, const std::nothrow_t& tag) noexcept {
+void operator delete[](void* ptr, const std::nothrow_t&) noexcept {
   operator delete[](ptr);
 }