Re: the prototype decl of memcpy/memcmp/calloc/free shouldnot in sched.h

[Szabolcs Nagy <nsz@port70.net>]

* ????????? <jianzhong.huang@i-soft.com.cn> [2014-10-31 11:42:35 +0800]:
> 
> In firefox, there is a system_wrapper header include sched.h, but in hunspell codes, calloc and free was redefined, so there is a conflicts here.
> for example, in "extensions/spellcheck/hunspell/src/hunspell_alloc_hooks.h"
> #define calloc(count, size) HunspellAllocator::CountingCalloc(count, size)
> 

a simple fix for that in musl is

	void *(calloc)(size_t, size_t);

or

	#define CPU_ALLOC(n) __cpu_alloc(n)
	static __inline cpu_set_t *__cpu_alloc(size_t _n)
	{
		extern void *(calloc)(size_t,size_t);
		return (calloc)(1,CPU_ALLOC_SIZE(_n));
	}

which almost gets the namespace right: only a non-function like
calloc macro defined before sched.h would be an issue

getting the namespace completely right would need a new extern
identifier in musl that aliases or wraps calloc

but _GNU_SOURCE has no well defined namespace requirement
so it is hard to justify workarounds that spill over into
other parts of the libc