I was reworking an existing AVR application for C89 compatibility, and while doing so, found an internal compiler error while dealing with inline assembly. I have taken the offending function and trimmed the code to a minimum for a test.

Output is as follows:
test.c: In function 'spi_manual_send_ass_GCC_BUGGY':
test.c:22: internal compiler error: in ptrreg_to_str, at config/avr/avr.c:1009
Please submit a full bug report,
with preprocessed source if appropriate.

The preprocessed source of test.i is appended:

# 1 "test.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "test.c"
typedef unsigned char uint8_t;

__inline__ uint8_t spi_manual_send_ass_GCC_BUGGY( uint8_t dat )
{
 uint8_t pb;






 __asm__ volatile (
  "\n"
  "nop \n\t"
  "ori %a1,8 \n\t"
  "out 0x05,%a1 \n\t"
  : "=&d" (dat)
  : "d" (pb)
 );

 return pb;
}

int main() {
 uint8_t dat = 0;
 uint8_t result = 0;
 result = spi_manual_send_ass_GCC_BUGGY(dat);
 return 0;
}