Joel Sherrill created an issue: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5297



## Summary

This appears to be happening on all 32-bit PowerPC BSPs. I spotted it in 
icecube but is is in qoriq_e6500_32, beatnik, and motorola_powerpc.

```
../../../bsps/powerpc/shared/exceptions/ppc_exc_asm_macros.h: Assembler 
messages:
../../../bsps/powerpc/shared/exceptions/ppc_exc_asm_macros.h:242: Warning: 
invalid register expression
../../../bsps/powerpc/shared/exceptions/ppc_exc_asm_macros.h:730:  Info: macro 
invoked from here
../../../bsps/powerpc/shared/exceptions/ppc_exc.S:132:   Info: macro invoked 
from here
../../../bsps/powerpc/shared/exceptions/ppc_exc_asm_macros.h:242: Warning: 
invalid register expression
../../../bsps/powerpc/shared/exceptions/ppc_exc_asm_macros.h:730:  Info: macro 
invoked from here
../../../bsps/powerpc/shared/exceptions/ppc_exc.S:135:   Info: macro invoked 
from here
```

We probably have missed this a long time because as uses "Warning:" while gcc 
uses "warning:".

## Steps to reproduce
Build a 32-bit PowerPC BSP and look for "Warning:" which is from the assembler. 


### Pre-set options

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