Joel Sherrill created an issue:
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5226
## Summary
The test spstdc17 produces this warning on SPARC/Leon3
```
[4255/4751] Compiling testsuites/sptests/spsyslock01/init.c
In file included from ../../../cpukit/include/rtems/score/percpu.h:43,
from ../../../cpukit/include/rtems/score/threaddispatch.h:41,
from ../../../testsuites/support/include/tmacros.h:50,
from ../../../testsuites/sptests/spstdc17/init.c:34:
../../../cpukit/score/cpu/sparc/include/rtems/score/cpuimpl.h:220:17: warning:
file-scope declaration of '_SPARC_Per_CPU_current' specifies 'register'
[-Wpedantic]
220 | register struct Per_CPU_Control *_SPARC_Per_CPU_current __asm__( "g6" );
| ^~~~~~~~~~~~~~~
```
I am not sure why GCC waited until C17 to complain about this but [CPP
reference](https://en.cppreference.com/w/c/language/storage_duration) states
that it is block scoped. This would imply the file scope declaration is an
issue.
This warning could be disabled around this code for >= C17 easily enough but we
need to understand if this has ramifications.
## Steps to reproduce
### Pre-set options
--
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5226
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