libctf: build system

This ties libctf into the build system, and makes binutils depend on it
(used by the next commits).

	* Makefile.def (host_modules): Add libctf.
	* Makefile.def (dependencies): Likewise.
	libctf depends on zlib, libiberty, and bfd.
	* Makefile.in: Regenerated.
	* configure.ac (host_libs): Add libctf.
	* configure: Regenerated.

libctf/
	* Makefile.am: New.
	* Makefile.in: Regenerated.
	* config.h.in: Likewise.
	* aclocal.m4: Likewise.
	* configure: Likewise.

libctf/configure.ac

@@ -0,0 +1,63 @@
+dnl                                            -*- Autoconf -*-
+dnl Process this file with autoconf to produce a configure script.
+dnl
+dnl   Copyright (C) 2019 Free Software Foundation, Inc.
+dnl
+dnl This file is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; see the file COPYING.  If not see
+dnl <http://www.gnu.org/licenses/>.
+dnl
+
+AC_PREREQ(2.64)
+AC_INIT([libctf library], 1.2.0-pre)
+AC_CONFIG_SRCDIR(ctf-impl.h)
+AC_CONFIG_MACRO_DIR(../config)
+AC_USE_SYSTEM_EXTENSIONS
+AM_INIT_AUTOMAKE
+
+# Checks for programs.
+AC_PROG_MAKE_SET
+AC_PROG_CC
+AC_PROG_RANLIB
+AM_PROG_AR
+
+AC_SYS_LARGEFILE
+
+MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
+AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
+AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
+AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
+
+# Figure out what compiler warnings we can enable.
+# See config/warnings.m4 for details.
+
+ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wno-narrowing -Wwrite-strings \
+			  -Wmissing-format-attribute], [warn])
+ACX_PROG_CC_WARNING_OPTS([-Wstrict-prototypes -Wmissing-prototypes \
+			  -Wold-style-definition], [c_warn])
+ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
+
+# Only enable with --enable-werror-always until existing warnings are
+# corrected.
+ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
+
+AM_MAINTAINER_MODE
+ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_libctf_warn_cflags])
+
+AC_FUNC_MMAP
+AC_CHECK_HEADERS(byteswap.h)
+AC_CHECK_FUNCS(pread)
+
+AC_CONFIG_FILES(Makefile)
+AC_CONFIG_HEADERS(config.h)
+AC_OUTPUT