Code

avr8-stub.c: In function uart_init

avr8-stub.c: 949:2: error: 'UCSR0A' undeclared (first use in this function); did you mean 'UCSR1A'?
   UCSR0A = _BV(U2X0);  \* double UART speed *
   ^~~~~~
   UCSR1A
avr8-stub.c:949: note  each undeclared identifier is reported only once for each function it appears in

io.h:99: In file included from
avr8-stub.c:32: from

avr8-stub.c: 949:15: error: 'U2X0' undeclared (first use in this function); did you mean 'U2X1'?
   UCSR0A = _BV(U2X0);  \* double UART speed *

avr8-stub.c: 950:2: error: 'UCSR0B' undeclared (first use in this function); did you mean 'UCSR0A'?
   UCSR0B = (1 << RXEN0 ) | (1 << TXEN0 );  \* enable RX and Tx *
   ^~~~~~
   UCSR0A

avr8-stub.c: 950:17: error: 'RXEN0' undeclared (first use in this function); did you mean 'RXEN1'?
   UCSR0B = (1 << RXEN0 ) | (1 << TXEN0 );  \* enable RX and Tx *
Error compiling libraries
   ^~~~~
Build failed for project 'Prova'
   RXEN1

avr8-stub.c: 950:33: error: 'TXEN0' undeclared (first use in this function); did you mean 'RXEN0'?
   UCSR0B = (1 << RXEN0 ) | (1 << TXEN0 );  \* enable RX and Tx *
   ^~~~~
   RXEN0

avr8-stub.c: 951:2: error: 'UCSR0C' undeclared (first use in this function); did you mean 'UCSR0B'?
   UCSR0C =  (1 << UCSZ00 ) | (1 << UCSZ01 ); \* Use 8- bit character sizes *
   ^~~~~~
   UCSR0B

avr8-stub.c: 951:18: error: 'UCSZ00' undeclared (first use in this function); did you mean 'UCSZ10'?
   UCSR0C =  (1 << UCSZ00 ) | (1 << UCSZ01 ); \* Use 8- bit character sizes *
   ^~~~~~
   UCSZ10

avr8-stub.c: 951:35: error: 'UCSZ01' undeclared (first use in this function); did you mean 'UCSZ00'?
   UCSR0C =  (1 << UCSZ00 ) | (1 << UCSZ01 ); \* Use 8- bit character sizes *
   ^~~~~~
   UCSZ00

avr8-stub.c: 952:2: error: 'UBRR0H' undeclared (first use in this function); did you mean 'UBRR1H'?
   UBRR0H = ( GDB_BAUD_PRESCALE >> 8)
   ^~~~~~
   UBRR1H

avr8-stub.c: 953:2: error: 'UBRR0L' undeclared (first use in this function); did you mean 'UBRR0H'?
   UBRR0L = GDB_BAUD_PRESCALE
   ^~~~~~
   UBRR0H

avr8-stub.c: 954:18: error: 'RXCIE0' undeclared (first use in this function); did you mean 'RXCIE1'?
   UCSR0B |= (1 << RXCIE0 ); \* Enable the USART Recieve Complete interrupt ( USART_RXC ) *
   ^~~~~~
   RXCIE1

avr8-stub.c: In function getDebugChar

avr8-stub.c: 962:12: error: 'UCSR0A' undeclared (first use in this function); did you mean 'UCSR1A'?
   while ( !(UCSR0A & (1<<RXC0)) )
   ^~~~~~
   UCSR1A

avr8-stub.c: 962:25: error: 'RXC0' undeclared (first use in this function); did you mean 'RXC1'?
   while ( !(UCSR0A & (1<<RXC0)) )
   ^~~~
   RXC1

avr8-stub.c: 965:18: error: 'UDR0' undeclared (first use in this function); did you mean 'UDR1'?
   return (uint8_t)UDR0
   ^~~~
   UDR1

avr8-stub.c: In function putDebugChar

avr8-stub.c: 972:13: error: 'UCSR0A' undeclared (first use in this function); did you mean 'UCSR1A'?
   while ( !( UCSR0A & (1<<UDRE0)) )
   ^~~~~~
   UCSR1A

avr8-stub.c: 972:26: error: 'UDRE0' undeclared (first use in this function); did you mean 'UDRE1'?
   while ( !( UCSR0A & (1<<UDRE0)) )
   ^~~~~
   UDRE1

avr8-stub.c: 976:2: error: 'UDR0' undeclared (first use in this function); did you mean 'UDRE0'?
   UDR0 = c
   ^~~~
   UDRE0

avr8-stub.c: In function __vector_1

avr8-stub.c: 1026:32: error: 'UCSR0A' undeclared (first use in this function); did you mean 'UCSR1A'?
   #define UART_RXINT_PENDING()  (UCSR0A & (1<<RXC0))
avr8-stub.c:2046: note  in expansion of macro UART_RXINT_PENDING
   if ( UART_RXINT_PENDING() ) {
   ^~~~~~~~~~~~~~~~~~

avr8-stub.c: 1026:45: error: 'RXC0' undeclared (first use in this function); did you mean 'RXC1'?
   #define UART_RXINT_PENDING()  (UCSR0A & (1<<RXC0))
avr8-stub.c:2046: note  in expansion of macro UART_RXINT_PENDING
   if ( UART_RXINT_PENDING() ) {
   ^~~~~~~~~~~~~~~~~~