Fix weaked initVariant()declaration

Can be defined WEAK or not in the variant
and/or at sketch level.

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

cores/arduino/Arduino.h

@@ -40,6 +40,10 @@
 #ifdef __cplusplus
 extern "C" {
 #endif // __cplusplus
+// Weak empty variant initialization function.
+// May be redefined by variant files.
+extern void initVariant() __attribute__((weak));
+
 extern void setup(void) ;
 extern void loop(void) ;
 

cores/arduino/main.cpp

@@ -20,12 +20,6 @@
 #define ARDUINO_MAIN
 #include "Arduino.h"
 
-
-// Weak empty variant initialization function.
-// May be redefined by variant files.
-void initVariant() __attribute__((weak));
-void initVariant() { }
-
 // Force init to be called *first*, i.e. before static object allocation.
 // Otherwise, statically allocated objects that need HAL may fail.
 __attribute__((constructor(101))) void premain()