[avr-gcc-list] Math symbols missing from AVR libgcc

[Sean Kauffman]

I have some AVR assembly which was generated for an unknown version of 
GCC. I can assemble this source into object code, but if I try to link 
it I am told that it contains undefined symbols.

Specifically, I am missing the following symbols:

__lshrsi3, __ashlsi3,
__divsi3, __divhi3, __divqi3, __modsi3, __modhi3, __modqi3,
__udivsi3, __udivhi3, __udivqi3, __umodsi3, __umodhi3, __umodqi3

These seem to be libgcc symbols, but they are not present in libgcc.a 
for my version of AVR-GCC (4.8.3). I verified this running nm on those 
files and there were no symbols with these names defined.

I have been unable to determine in which versions of AVR-GCC these 
symbols were present, if at all, or if they were provided by another 
library.

For clarity, here is a trivial example of an assembly file which will 
assemble without issue but fails linking:


    .text
    .globl  main
    .align  2
    .type   main,@function
main:                                   ; @main
; BB#0:
    ldi r24, 31
    ldi r22, 31
    call    __udivqi3
    ret
.Ltmp1:
    .size   main, .Ltmp1-main

Trying to link this fails with the following error:

/tmp/ccxYMfat.o:udiv.s:9: undefined reference to `__udivqi3'
collect2: error: ld returned 1 exit status

Here's the libgcc I'm using:

$ avr-gcc -print-libgcc-file-name
/usr/lib/gcc/avr/4.8.3/libgcc.a

Which does not contain the symbol __udivqi3

$ avr-nm /usr/lib/gcc/avr/4.8.3/avr6/libgcc.a |grep udivq
$

Does anyone on this list know if these symbols were ever present in AVR 
GCC?  If so in what version?  If not, do you know where they are really 
supposed to be coming from?  Are there drop in replacements for them 
that follow the same calling conventions and do the same things?

I really appreciate any help.

Thanks!
Sean

P.S. Is this is the right list to email, or should I be trying the 
developers list?

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