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pic18f4680 / 4550 calling functions

  • Hello,

    The following code works like a charm on a pic18f4550.
    Output on the serial port is "A6A6A6A6A6A6A6A".

    Now compiling exactly the same source code (or even using the hex-file for the 4550) for a pic18f4680 produces the following output:
    The parameter '6' in test_func is somehow not properly transmitted to the function?!

    Has anyone else seen this behaviour? what can i do to resolve it?
    Might it be related to the sdcc compiler? or is it just my code?

    sdcc -v
    SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08 2.8.4 #5242 (Sep 28 2008) (Mac OS X i386)
    (other versions of sdcc produce the same behaviour)

    Nice greetings,

    typedef unsigned char uchar;

    uchar test_func(uchar x) {
      return x+48;

    void main(void) {

      while(1) {