move docstrings in C++ files out of C strings and into comments * __contourc__.cc, __dispatch__.cc, __dsearchn__.cc, __ichol__.cc, __ilu__.cc, __lin_interpn__.cc, __luinc__.cc, __magick_read__.cc, __pchip_deriv__.cc, __qp__.cc, balance.cc, besselj.cc, betainc.cc, bitfcns.cc, bsxfun.cc, cellfun.cc, colloc.cc, conv2.cc, daspk.cc, dasrt.cc, dassl.cc, data.cc, debug.cc, defaults.cc, det.cc, dirfns.cc, dlmread.cc, dot.cc, eig.cc, ellipj.cc, error.cc, fft.cc, fft2.cc, fftn.cc, file-io.cc, filter.cc, find.cc, gammainc.cc, gcd.cc, getgrent.cc, getpwent.cc, getrusage.cc, givens.cc, graphics.cc, hash.cc, help.cc, hess.cc, hex2num.cc, input.cc, inv.cc, kron.cc, load-path.cc, load-save.cc, lookup.cc, ls-oct-text.cc, lsode.cc, lu.cc, mappers.cc, matrix_type.cc, max.cc, mgorth.cc, nproc.cc, oct-hist.cc, octave-link.cc, ordschur.cc, pager.cc, pinv.cc, pr-output.cc, profiler.cc, psi.cc, pt-jit.cc, quad.cc, quadcc.cc, qz.cc, rand.cc, rcond.cc, regexp.cc, schur.cc, sighandlers.cc, sparse.cc, spparms.cc, sqrtm.cc, str2double.cc, strfind.cc, strfns.cc, sub2ind.cc, svd.cc, sylvester.cc, symtab.cc, syscalls.cc, sysdep.cc, time.cc, toplev.cc, tril.cc, tsearch.cc, typecast.cc, urlwrite.cc, utils.cc, variables.cc, __delaunayn__.cc, __eigs__.cc, __fltk_uigetfile__.cc, __glpk__.cc, __init_fltk__.cc, __init_gnuplot__.cc, __osmesa_print__.cc, __voronoi__.cc, amd.cc, audiodevinfo.cc, audioread.cc, ccolamd.cc, chol.cc, colamd.cc, convhulln.cc, dmperm.cc, fftw.cc, qr.cc, symbfact.cc, symrcm.cc, ov-base.cc, ov-bool-mat.cc, ov-cell.cc, ov-class.cc, ov-classdef.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-flt-re-mat.cc, ov-int16.cc, ov-int32.cc, ov-int64.cc, ov-int8.cc, ov-java.cc, ov-null-mat.cc, ov-oncleanup.cc, ov-range.cc, ov-re-mat.cc, ov-struct.cc, ov-typeinfo.cc, ov-uint16.cc, ov-uint32.cc, ov-uint64.cc, ov-uint8.cc, ov-usr-fcn.cc, ov.cc, octave.cc, pt-arg-list.cc, pt-binop.cc, pt-eval.cc, pt-mat.cc, lex.ll, oct-parse.in.yy: Docstrings are now comments instead of C strings. * build-aux/mk-opts.pl: Emit docstrings as comments instead of C strings. * DASPK-opts.in, LSODE-opts.in: Don't quote " in docstring fragments. * builtins.h: Include builtin-defun-decls.h unconditionally. * defun.h (DEFUN, DEFUNX, DEFCONSTFUN): Simply emit declaration. (DEFALIAS): Always expand to nothing. * defun-dld.h: No special macro expansions for MAKE_BUILTINS. (DEFUN_DLD): Use FORWARD_DECLARE_FUN. (DEFUNX_DLD): Use FORWARD_DECLARE_FUNX. * defun-int.h: No special macro expansions for MAKE_BUILTINS. (FORWARD_DECLARE_FUN, FORWARD_DECLARE_FUNX): New macros. (DEFINE_FUN_INSTALLER_FUN): If compiling an Octave source file, pass "external-doc" to DEFINE_FUNX_INSTALLER_FUN. (DEFUN_INTERNAL, DEFCONSTFUN_INTERNAL, DEFUNX_INTERNAL, DEFALIAS_INTERNAL): Delete. * common.mk (move_if_change_rule): New macro. (simple_move_if_change_rule): Define using move_if_change_rule. * find-defun-files.sh (DEFUN_PATTERN): Update. Don't transform file name extension to ".df". * libinterp/mk-pkg-add, gendoc.pl: Operate directly on source files. * mkbuiltins: New argument, SRCDIR. Operate directly on source files. * mkdefs: Delete. * libinterp/module.mk (BUILT_SOURCES): Update list to contain only files included in other source files. (GENERATED_MAKE_BUILTINS_INCS, DEF_FILES): Delete. (LIBINTERP_BUILT_DISTFILES): Include $(OPT_HANDLERS) here. (LIBINTERP_BUILT_NODISTFILES): Not here. Remove $(ALL_DEF_FILES from the list. (libinterp_EXTRA_DIST): Remove mkdefs from the list. (FOUND_DEFUN_FILES): Rename from SRC_DEF_FILES. (DLDFCN_DEFUN_FILES): Rename from DLDFCN_DEF_FILES. (SRC_DEFUN_FILES): Rename from SRC_DEF_FILES. (ALL_DEFUN_FILES): Rename from ALL_DEF_FILES. (%.df: %.cc): Delete pattern rule. (libinterp/build-env-features.cc, libinterp/builtins.cc, libinterp/dldfcn/PKG_ADD): Use mv instead of move-if-change. (libinterp/builtins.cc, libinterp/builtin-defun-decls.h): Update mkbuiltins command. ($(srcdir)/libinterp/DOCSTRINGS): Update gendoc.pl command. * liboctave/module.mk (BUILT_SOURCES): Don't include liboctave-build-info.cc in the list.

--- a/libinterp/corefcn/gcd.cc	Tue Jun 21 13:08:25 2016 -0700
+++ b/libinterp/corefcn/gcd.cc	Tue Jun 21 16:07:51 2016 -0400
@@ -434,43 +434,43 @@
 }
 
 DEFUN (gcd, args, nargout,
-       "-*- texinfo -*-\n\
-@deftypefn  {} {@var{g} =} gcd (@var{a1}, @var{a2}, @dots{})\n\
-@deftypefnx {} {[@var{g}, @var{v1}, @dots{}] =} gcd (@var{a1}, @var{a2}, @dots{})\n\
-Compute the greatest common divisor of @var{a1}, @var{a2}, @dots{}.\n\
-\n\
-If more than one argument is given then all arguments must be the same size\n\
-or scalar.  In this case the greatest common divisor is calculated for each\n\
-element individually.  All elements must be ordinary or Gaussian (complex)\n\
-integers.  Note that for Gaussian integers, the gcd is only unique up to a\n\
-phase factor (multiplication by 1, -1, i, or -i), so an arbitrary greatest\n\
-common divisor among the four possible is returned.\n\
-\n\
-Optional return arguments @var{v1}, @dots{}, contain integer vectors such\n\
-that,\n\
-\n\
-@tex\n\
-$g = v_1 a_1 + v_2 a_2 + \\cdots$\n\
-@end tex\n\
-@ifnottex\n\
-\n\
-@example\n\
-@var{g} = @var{v1} .* @var{a1} + @var{v2} .* @var{a2} + @dots{}\n\
-@end example\n\
-\n\
-@end ifnottex\n\
-\n\
-Example code:\n\
-\n\
-@example\n\
-@group\n\
-gcd ([15, 9], [20, 18])\n\
-   @result{}  5  9\n\
-@end group\n\
-@end example\n\
-\n\
-@seealso{lcm, factor, isprime}\n\
-@end deftypefn")
+       doc: /* -*- texinfo -*-
+@deftypefn  {} {@var{g} =} gcd (@var{a1}, @var{a2}, @dots{})
+@deftypefnx {} {[@var{g}, @var{v1}, @dots{}] =} gcd (@var{a1}, @var{a2}, @dots{})
+Compute the greatest common divisor of @var{a1}, @var{a2}, @dots{}.
+
+If more than one argument is given then all arguments must be the same size
+or scalar.  In this case the greatest common divisor is calculated for each
+element individually.  All elements must be ordinary or Gaussian (complex)
+integers.  Note that for Gaussian integers, the gcd is only unique up to a
+phase factor (multiplication by 1, -1, i, or -i), so an arbitrary greatest
+common divisor among the four possible is returned.
+
+Optional return arguments @var{v1}, @dots{}, contain integer vectors such
+that,
+
+@tex
+$g = v_1 a_1 + v_2 a_2 + \cdots$
+@end tex
+@ifnottex
+
+@example
+@var{g} = @var{v1} .* @var{a1} + @var{v2} .* @var{a2} + @dots{}
+@end example
+
+@end ifnottex
+
+Example code:
+
+@example
+@group
+gcd ([15, 9], [20, 18])
+   @result{}  5  9
+@end group
+@end example
+
+@seealso{lcm, factor, isprime}
+@end deftypefn */)
 {
   int nargin = args.length ();