[PATCH] libdebugger: Fix for ARMv7-M with -O0 optimization

[Sebastian Huber]

On 25/02/2019 22:46, Chris Johns wrote:
> Hi,
>
> The patch looks like it is masking something but I am not sure.
>
> What are the errors at -O0 the patch is attempting to resolve?
>
> Which BSP is showing the issue?
> What is the multilib ARM arch?

The ARMv7-M is affected by this.

>
> Are these errors seen at -O2 and if not why does -O0 cause them?

With -O2 the assembler doesn't see the offending machine instructions, 
they are optimized away. See the useless local variables in 
rtems_debugger_target_set_vectors().

>
> The intention is for the ARM back end to work on more than the CortexA9 so I am
> concerned with making the whole of `target_exception` dependent on CP15.

I just removed the useless assignment to local variables in 
rtems_debugger_target_set_vectors() and expanded the scope of the 
ARM_CP15 block. There is no functional change.

-- 
Sebastian Huber, embedded brains GmbH

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