[Bug libc/11120] New: strncmp() will be broken if used in ld.so on x86-64

["mrs at mythic-beasts dot com" <sourceware-bugzilla at sourceware dot org>]

As of 7956a3d2, sysdeps/x86_64/strcmp.S implements optimised versions
of both strcmp() and strncmp().  When this file is built into ld.so,
however, it falls back to using the unoptimised code which implements
only strcmp().  If strncmp() is ever used in ld.so on x86-64 it will
silently be implemented as strcmp().

Whether to fix this is upto the glibc developers.  If you don't want
to fix this I would suggest adding the following to the top of
sysdeps/x86_64/strncmp.S so that strncmp()'s behaviour does not come
as a surprise if it is ever used in this context:

#ifdef NOT_IN_libc
#  error "Not implemented for ld.so"
#endif

-- 
           Summary: strncmp() will be broken if used in ld.so on x86-64
           Product: glibc
           Version: 2.11
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: mrs at mythic-beasts dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11120

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