Matteo Concas created an issue:
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5501
## Summary
`_Processor_mask_Find_last_set()` calls the `flsl()` function. This function is
declared in `strings.h` but behind a `__BSD_VISIBLE` guard (which is 0 in our
case). This means it is effectively not declared, this is fine most of the time
but when using `-std=c11` (or another standard like C99) it will throw an
"implicit declaration of function 'flsl' [-Wimplicit-function-declaration]"
error.
## Steps to reproduce
Add "-std=c11" to your flags and compile a binary making use of
`_Processor_mask_Find_last_set()` will give you this:
```bash
/prefix/bsp/lib/include/rtems/score/processormaskimpl.h: In function
'_Processor_mask_Find_last_set':
/prefix/bsp/lib/include/rtems/score/processormaskimpl.h:285:21: error: implicit
declaration of function 'flsl' [-Wimplicit-function-declaration]
285 | return (uint32_t) __BIT_FLS( CPU_MAXIMUM_PROCESSORS, a );
| ^~~~~~~~~
```
Using `-std=gnu11` instead will "fix" it but we should probably use something
else like `__builtin_ctzl()` instead.
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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5501
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