[PATCH, newlib] Allow locking routine to be retargeted

[Thomas Preudhomme]

Please find attached the updated patch.

I've noticed that there is also some target and OS specific locks: 
_arc4random_mutex and many Linux/rtems/tirtos specific locks.

I haven't included those.

Best regards,

Thomas

On 13/01/17 18:16, Thomas Preudhomme wrote:
>
>
> On 13/01/17 18:05, Freddie Chopin wrote:
>> On Fri, 2017-01-13 at 13:24 +0000, Thomas Preudhomme wrote:
>>> And here's the patch. Tested with full and partial retargeting as
>>> well as no
>>> retargeting.
>>
>> I confirm - if I provide just some of the functions/objects, the
>> linking will fail with "multiple definition" error. Great!
>>
>> Any chance for adding all locks used by newlib internally? These 4 are
>> missing from what I've seen:
>> newlib/libc/posix/telldir.c:__LOCK_INIT(static, dd_hash_lock);
>> newlib/libc/time/tzlock.c:__LOCK_INIT(static, __tz_lock_object);
>> newlib/libc/stdlib/quick_exit.c:__LOCK_INIT(static, atexit_mutex);
>> newlib/libc/stdlib/envlock.c:__LOCK_INIT_RECURSIVE(static, __env_lock_object);
>>
>> I know these are not "popular", but nevertheless required. For example
>> time-zone locking is pulled by any function dealing with "local" time,
>> like a very useful mktime(). 4 bytes here or there is not such a big
>> deal (;
>
> Oh yes absolutely. I forgot that I added the lock only based on testing rather
> than analysis of the code. Thanks for pointing that out.
>
> Best regards,
>
> Thomas
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