undefined reference to `__gnu_thumb1_case_uqi'

[Ulf Samuelsson <ulf.samuelsson@atmel.com>]

The following code, (part of a bootloader - at91bootstrap-3.0)

"void sub(unsigned char Mode)
{
    switch (Mode) {
    ...
    /* 4 case statements */
"

generates an error when compiling in thumb mode, using the latest OE.

"undefined reference to `__gnu_thumb1_case_uqi'"

I think this subroutine will optimize a switch statment
with only a few choices.


Googling for this seems to indicate that __gnu_thumb1_case_uqi is part
of libgcc, but hidden.

Switches used: -DCONFIG_THUMB -mthumb -mthumb-interwork

Any clues on fixing this?
Meanwhile I will rewrite the bootloader using if statements

Best Regards
Ulf Samuelsson