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Date: Sun, 17 Apr 2011 14:31:09 +0200
From: Andreas Oberritter <obi@opendreambox.org>
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Subject: Re: undefined reference to `__gnu_thumb1_case_uqi'
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On 04/16/2011 01:29 PM, Ulf Samuelsson wrote:
> 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

Does adding -ffreestanding help?

Regards,
Andreas