https://sourceware.org/git/?p=glibc.git;a=commit;h=94e73c95d9b5ac7d3b3f178e2ca03ef6b60e82aa made it's way to Fedora via http://pkgs.fedoraproject.org/cgit/rpms/glibc.git/commit/?id=9a78be1808600ca5e66eab741542447a29cfbeb3

Compiling the rawhide kernel with this new glibc produces build errors:

gcc  -o /builddir/build/BUILD/kernel-4.6.fc25/linux-4.7.0-0.rc6.git2.1.fc25.x86_64/tools/objtool/fixdep /builddir/build/BUILD/kernel-4.6.fc25/linux-4.7.0-0.rc6.git2.1.fc25.x86_64/tools/objtool/fixdep-in.o
scripts/recordmcount.c: In function 'do_file':
scripts/recordmcount.c:466:28: error: 'R_METAG_ADDR32' undeclared (first use in this function)
  case EM_METAG:  reltype = R_METAG_ADDR32;
                            ^~~~~~~~~~~~~~
scripts/recordmcount.c:466:28: note: each undeclared identifier is reported only once for each function it appears in
scripts/recordmcount.c:468:20: error: 'R_METAG_NONE' undeclared (first use in this function)
     rel_type_nop = R_METAG_NONE;


recordmcount.c has this:

#ifndef EM_METAG
/* Remove this when these make it to the standard system elf.h. */
#define EM_METAG      174
#define R_METAG_ADDR32                   2
#define R_METAG_NONE                     3
#endif

The afformentioned glibc commit added the #define EM_METAG but failed to add the relocation information.