lib/49685: Missing strtoull(3) in _POSIX_C_SOURCE 200809L

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>Number:         49685
>Category:       lib
>Synopsis:       Missing strtoull(3) in _POSIX_C_SOURCE 200809L
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 22 12:55:00 +0000 2015
>Originator:     Kamil Rytarowski
>Release:        NetBSD-current, 7, 6, 5
>Organization:
>Environment:
NetBSD compaq 7.99.1 NetBSD 7.99.1 (GENERIC) #0: Fri Nov  7 22:04:53 CET 2014  kamil@chieftec:/tmp/netbsd-tmp/sys/arch/amd64/compile/GENERIC amd64
>Description:
According to POSIX documentation [1]

strtoull(3) is a part of POSIX 2008

For NetBSD it's enabled with:
    _ISOC99_SOURCE
    STDC_VERSION >= 199901L
    _NETBSD_SOURCE
    __cplusplus >= 201103L

I'm working on a piece of code which defines -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 and assumes availability of the strtoull(3) function, which causes problems on NetBSD.

[1]  http://pubs.opengroup.org/onlinepubs/9699919799/
>How-To-Repeat:
$ cat test.c
#include <stdlib.h>

int main()
{
	return strtoull("1", NULL, 0);
}

$ gcc -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -Wall test.c  
test.c: In function 'main':
test.c:5:2: warning: implicit declaration of function 'strtoull' [-Wimplicit-function-declaration]
  return strtoull("1", NULL, 0);
>Fix:
rearange namespace of strtoull(3) in src/include/stdlib.h