Warnings in zend_alloc.h

Can you provide more info re: operating system and version? Compiler version?
Thanks.

Sent from my iPhone

Nut sure whether this is an issue or not but I see it a lot while
compiling master:

Zend/zend_alloc.h:57:236: warning: unknown attribute 'alloc_size'
ignored [-Wunknown-attributes]
attribute ((visibility("default"))) void* _emalloc(size_t size,
const char *__zend_filename, const uint __zend_lineno,
const char *__zend_orig_filename, const uint __zend_orig_lineno)
attribute ((malloc)) attribute ((alloc_size(1)));

Zend/zend_alloc.h:61:250: warning: unknown attribute 'alloc_size'
ignored [-Wunknown-attributes]
attribute ((visibility("default"))) void* _ecalloc(size_t nmemb,
size_t size , const char *__zend_filename, const uint __zend_lineno,
const char *__zend_orig_filename, const uint __zend_orig_lineno)
attribute ((malloc)) attribute ((alloc_size(1,2)));

Zend/zend_alloc.h:62:238: warning: unknown attribute 'alloc_size'
ignored [-Wunknown-attributes]
attribute ((visibility("default"))) void* _erealloc(void *ptr,
size_t size, int allow_failure , const char *__zend_filename,
const uint __zend_lineno , const char *__zend_orig_filename,
const uint __zend_orig_lineno) attribute ((alloc_size(2)));