This file is indexed.

/usr/lib/gcc-cross/powerpc-linux-gnu/6/plugin/include/config/rs6000/secureplt.h is in gcc-6-plugin-dev-powerpc-linux-gnu 6.4.0-17ubuntu1cross1.

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/* Default to -msecure-plt.
   Copyright (C) 2005-2016 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#define CC1_SECURE_PLT_DEFAULT_SPEC "-msecure-plt"
#define LINK_SECURE_PLT_DEFAULT_SPEC "--secure-plt"