[Sdcc-user] pic16 - printf() - error: multiple sections using address 0

[Daryl V. V. <dv...@te...>]

Hi,

Thanks for your quick responses so far guys. :) (And I feel a little
stupid after finding the __shadowregs thing in the docs)

I'm having problems compiling code that uses printf(). When I try to
compile the code below I get the following results:

#include <pic18fregs.h>
#include <stdio.h>

#pragma stack 0x00 64

void main(void) {
  stdout = STREAM_USART;
  printf("Hello World\n");
  while(1);
}

$ sdcc -mpic16 -p18f452 -llibc18f.lib test.c
Processor: 18f452
message: using default linker script
"/home/daryl/local/share/gputils/lkr/18f452.lkr"
error: multiple sections using address 0

I must be missing something obvious here.

What is causing that? I've searched the list and did a little googling,
but didn't find an answer. Do I need a custom linker script? Is setting
stdout = STREAM_USART valid? I'm using a CVS version of sdcc from a
couple days ago.

I've also tried using printf_tiny() and defining my own putchar() as
described in the docs. No luck.

When I try to do it with -p18f1220 I get a different error:

error: missing definition for symbol "_SSPBUF"

The SSPBUF issue appears to stem from the fact that there is no ssp on
the 18f1220 but the library code assumes there is. Also, building lib-io
is broken for the 18f1220 because of no i2c support.

Thanks,

-Daryl.