undefined reference to `__gnu_thumb1_case_uqi'

undefined reference to `__gnu_thumb1_case_uqi'

[Ulf Samuelsson]

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

Re: undefined reference to `__gnu_thumb1_case_uqi'

[Andreas Oberritter]

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

Re: undefined reference to `__gnu_thumb1_case_uqi'

[Khem Raj]

On (16/04/11 13:29), 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?

what is your linker command ? Are you using gcc to do the linking or
calling out ld explicitly.

> Meanwhile I will rewrite the bootloader using if statements
> 
> Best Regards
> Ulf Samuelsson
> 
> 
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-- 
-Khem