glibc/sysdeps/x86_64/Versions

libc {
  GLIBC_2.14 {
    memcpy;
  }
  GLIBC_2.13 {
    __fentry__;
  }
}
libm {
  GLIBC_2.1 {
    # A generic bug got this omitted from other configurations' version
    # sets, but we always had it.
    exp2l;
  }
}