Re: [PATCH newlib] libc/include/malloc.h: Add prototype for GNU extension malloc_usable_size()

[Sebastian Huber <sebastian.huber@embedded-brains.de>]

On 15/03/2022 16:47, Mike Frysinger wrote:
> On 15 Mar 2022 10:16, Joel Sherrill wrote:
>> This is not provided by the newlib malloc implementation but may
>> be available in external implementations.
>> ---
>>   newlib/libc/include/malloc.h | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/newlib/libc/include/malloc.h b/newlib/libc/include/malloc.h
>> index a9dc5bca6..e73095e1e 100644
>> --- a/newlib/libc/include/malloc.h
>> +++ b/newlib/libc/include/malloc.h
>> @@ -137,6 +137,10 @@ extern void __malloc_lock(struct _reent *);
>>   
>>   extern void __malloc_unlock(struct _reent *);
>>   
>> +#if __GNU_VISIBLE
>> +extern size_t malloc_usable_size(void *);
>> +#endif
>> +
> i'm confused.  isn't this prototype already defined in this header file
> on line 101 above where you added this ?

Yes, and it is implemented by the Newlib malloc.

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