libctf, binutils: initial work towards libctf gettextization

We gettextize under our package name, which we change to a more
reasonable 'libctf'.  Our internationalization support is mostly
provided by ctf-intl.h, which is a copy of opcodes/opintl.h with
the non-gettext_noop N_() expansion debracketed to avoid pedantic
compiler warnings.

The libctf error strings returned by ctf_errmsg are marked up for
internationalization.

(We also adjust binutils's Makefile a tiny bit to allow for the
fact that libctf now uses functions from libintl.)

binutils/ChangeLog
2020-08-27  Nick Alcock  <nick.alcock@oracle.com>

	* Makefile.am (readelf_LDADD): Move $(LIBINTL) after $(LIBCTF_NOBFD).
	* Makefile.in: Regenerated.

libctf/ChangeLog
2020-08-27  Nick Alcock  <nick.alcock@oracle.com>

	* configure.ac: Adjust package name to simply 'libctf': arbitrarily
	declare this to be version 1.2.0.
	* Makefile.am (AM_CPPFLAGS): Add @INCINTL@.
	* Makefile.in: Regenerated.
	* configure: Regenerated.
	* ctf-intl.h: New file, lightly modified from opcodes/opintl.h.
	* ctf-impl.h: Include it.
	* ctf-error.r (_ctf_errlist_t): Mark strings as noop-translatable.
	(ctf_errmsg): Actually translate them.

libctf/ctf-intl.h

@@ -0,0 +1,68 @@
+/* ctf-intl.h - libctf specific header for gettext code.
+   Copyright (C) 1998-2020 Free Software Foundation, Inc.
+
+   Written by Tom Tromey <tromey@cygnus.com>
+
+   This file is part of libctf.
+
+   This library 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.
+
+   It 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 this file; see the file COPYING.  If not, write to the
+   Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#ifndef _CTF_INTL_H
+#define _CTF_INTL_H
+
+#ifdef ENABLE_NLS
+# include <libintl.h>
+/* Note the redefinition of gettext and ngettext here to use PACKAGE.
+
+   This is because the code in this directory is used to build a
+   library which will be linked with code in other directories to form
+   programs.  We want to maintain a separate translation file for this
+   directory however, rather than being forced to merge it with that
+   of any program linked to libopcodes.  This is a library, so it
+   cannot depend on the catalog currently loaded.
+
+   In order to do this, we have to make sure that when we extract
+   messages we use the LIBCTF domain rather than the domain of the
+   program that included the opcodes library, (eg OBJDUMP).  Hence we
+   use dgettext (PACKAGE, String) and define PACKAGE to be 'libctf'.
+   (See the code in configure).  */
+# undef gettext
+# define gettext(Msgid) dgettext (PACKAGE, Msgid)
+# undef ngettext
+# define ngettext(Msgid1, Msgid2, n) dngettext (PACKAGE, Msgid1, Msgid2, n)
+# define _(String) gettext (String)
+# ifdef gettext_noop
+#  define N_(String) gettext_noop (String)
+# else
+#  define N_(String) String
+# endif
+#else
+# define gettext(Msgid) (Msgid)
+# define dgettext(Domainname, Msgid) (Msgid)
+# define dcgettext(Domainname, Msgid, Category) (Msgid)
+# define ngettext(Msgid1, Msgid2, n) \
+  (n == 1 ? Msgid1 : Msgid2)
+# define dngettext(Domainname, Msgid1, Msgid2, n) \
+  (n == 1 ? Msgid1 : Msgid2)
+# define dcngettext(Domainname, Msgid1, Msgid2, n, Category) \
+  (n == 1 ? Msgid1 : Msgid2)
+# define textdomain(Domainname) do {} while (0)
+# define bindtextdomain(Domainname, Dirname) do {} while (0)
+# define _(String) (String)
+# define N_(String) String
+#endif
+
+#endif /* _CTF_INTL_H */