use c++11 "= default" syntax for declaration of trivial destructors * make_int.cc, Canvas.h, GenericEventNotify.h, TextEdit.h, gl-select.h, QTerminal.h, files-dock-widget.h, history-dock-widget.h, octave-cmd.h, octave-dock-widget.h, octave-interpreter.h, thread-manager.h, welcome-wizard.h, workspace-model.h, workspace-view.h, base-text-renderer.h, comment-list.h, debug.h, dynamic-ld.cc, dynamic-ld.h, ft-text-renderer.cc, gl-render.h, gl2ps-print.cc, graphics.in.h, hook-fcn.h, input.h, load-path.h, mxarray.in.h, oct-errno.h, oct-fstrm.h, oct-handle.h, oct-iostrm.h, oct-lvalue.h, oct-stdstrm.h, oct-stream.cc, oct-stream.h, oct-strstrm.h, pr-output.cc, procstream.h, sighandlers.cc, symtab.h, text-renderer.h, txt-eng.h, variables.cc, workspace-element.h, __init_fltk__.cc, __init_gnuplot__.cc, ov-base-diag.h, ov-base-int.h, ov-base-scalar.h, ov-base-sparse.h, ov-base.h, ov-bool-mat.h, ov-bool-sparse.h, ov-bool.h, ov-builtin.h, ov-cell.h, ov-ch-mat.h, ov-class.h, ov-classdef.cc, ov-classdef.h, ov-colon.h, ov-complex.cc, ov-complex.h, ov-cs-list.h, ov-cx-diag.h, ov-cx-mat.h, ov-cx-sparse.h, ov-fcn-handle.h, ov-fcn-inline.h, ov-fcn.h, ov-float.h, ov-flt-complex.h, ov-flt-cx-diag.h, ov-flt-cx-mat.h, ov-flt-re-diag.h, ov-flt-re-mat.h, ov-intx.h, ov-lazy-idx.h, ov-re-diag.h, ov-re-mat.h, ov-re-sparse.h, ov-scalar.h, ov-str-mat.h, ov-struct.h, ov-typeinfo.h, ov-usr-fcn.h, ovl.h, octave.h, lex.h, parse.h, pt-binop.h, pt-bp.h, pt-cell.h, pt-check.h, pt-classdef.h, pt-cmd.h, pt-const.h, pt-decl.h, pt-eval.h, pt-exp.h, pt-fcn-handle.h, pt-funcall.h, pt-id.h, pt-jump.h, pt-loop.h, pt-mat.cc, pt-mat.h, pt-misc.h, pt-pr-code.h, pt-unop.h, pt-walk.h, pt.h, DiagArray2.h, MArray.h, MDiagArray2.h, MSparse.h, idx-vector.h, quit.h, CollocWt.h, DAE.h, DAEFunc.h, DAERT.h, DAERTFunc.h, DASPK.h, DASRT.h, DASSL.h, EIG.h, LSODE.h, ODE.h, ODEFunc.h, ODES.h, ODESFunc.h, Quad.h, aepbalance.h, base-dae.h, base-de.h, base-min.h, fEIG.h, gepbalance.h, gsvd.h, hess.h, lu.h, oct-rand.h, oct-spparms.h, qr.h, qrp.h, schur.h, sparse-lu.h, svd.h, child-list.h, file-stat.h, oct-passwd.h, oct-time.h, oct-uname.h, action-container.h, base-list.h, cmd-edit.cc, cmd-edit.h, cmd-hist.cc, cmd-hist.h, glob-match.h, lo-array-errwarn.h, lo-regexp.h, oct-mutex.h, pathsearch.h, str-vec.h, url-transfer.h:

--- a/libinterp/corefcn/ft-text-renderer.cc	Tue Dec 06 10:44:20 2016 -0500
+++ b/libinterp/corefcn/ft-text-renderer.cc	Tue Dec 06 10:59:29 2016 -0500
@@ -351,7 +351,7 @@
         color (dim_vector (1, 3), 0)
     { }
 
-    ~ft_text_renderer (void) { }
+    ~ft_text_renderer (void) = default;
 
     void visit (text_element_string& e);