[Bug 6074] New: Test __USE_XOPEN2K8 instead of __USE_GNU for several functions in <string.h>

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6074

           Summary: Test __USE_XOPEN2K8 instead of __USE_GNU for several
                    functions in <string.h>
           Product: uClibc
           Version: 0.9.33.2
          Platform: All
               URL: http://pubs.opengroup.org/onlinepubs/9699919799/functi
                    ons/strndup.html
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Standard Compliance
        AssignedTo: unassigned at uclibc.org
        ReportedBy: maarten at treewalker.org
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Functions such as strndup() are included in POSIX-2008.1, but are still marked
as GNU extensions in uClibc. The <string.h> header is based on glibc, so I ran
a diff between glibc 2.15 and uClibc 0.9.33.2 of that header file; everywhere
glibc checks for __USE_XOPEN2K8 and uClibc checks for __USE_GNU I patched
uClibc. The resulting patch is attached.

I only looked at <string.h>, it is likely other headers might need a similar
update, but my immediate problem of strndup() not being declared is solved now.

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