adding basic files for build environment creation

Start adding basic files for generating all the needed files to create a
working build environment by the autotools. By this currently only the
shared library of libcoap is build.
There is no API version implemented! This has to be done later.

COPYING

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+libcoap is published as open-source software without any warranty of any kind.
+
+Use is permitted under the terms of the GNU General Public License (GPL),
+Version 2 or higher, OR the revised BSD license.
+
+The respective license file are shipped as LICENSE.BSD and LICENSE.GPL.

Makefile.am

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+# Makefile.am for libcoap
+#
+# Copyright (C) 2010-2015 Olaf Bergmann <bergmann@tzi.org>
+#           (C)      2015 Carsten Schoenert <c.schoenert@t-online.de>
+#
+# This file is part of the CoAP C library libcoap. Please see README and
+# COPYING for terms of use.
+
+## Place generated object files (.o) into the same directory as their source
+## files, in order to avoid collisions when non-recursive make is used.
+AUTOMAKE_OPTIONS = subdir-objects
+
+ACLOCAL_AMFLAGS = ${ACLOCAL_FLAGS} -I m4
+
+## default CFLAGS
+DEFAULT_CFLAGS = -D_GNU_SOURCE -DWITH_POSIX -Wall -Wextra -Wunused -Wunused-result -Wlogical-op -Winline -Wswitch-default -Wswitch-enum -fPIC -pedantic -Wformat -Wformat-security -fPIE -pie
+
+AM_CFLAGS = -I @top_builddir@/include/coap/ $(DEFAULT_CFLAGS) -std=c99
+
+## The libtool archive file (.la) will be installed into the directory named
+## by the predefined variable $(bindir), along with the actual shared library
+## file (.so).
+lib_LTLIBRARIES = libcoap.la
+
+## Define the source file list for the "libcoap.la" target.
+## Note that it is not necessary to list header files which are already listed
+## elsewhere in a _HEADERS variable assignment.
+libcoap_la_SOURCES = \
+  src/async.c \
+  src/block.c \
+  src/coap_io.c \
+  src/debug.c \
+  src/encode.c \
+  src/hashkey.c \
+  src/mem.c \
+  src/net.c \
+  src/option.c \
+  src/pdu.c \
+  src/resource.c \
+  src/str.c \
+  src/subscribe.c \
+  src/uri.c
+
+## Instruct libtool to add the library version '0.0.0' into the shared library
+## file (.so). This will be changed later to a substituted version via variables.
+libcoap_la_LDFLAGS = -version-info 0
+
+## Define an independent executable script for inclusion in the distribution
+## archive.  However, it will not be installed on an end user's system due to
+## the noinst_ prefix.
+dist_noinst_SCRIPTS = autogen.sh
+

README

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+README.md

autogen.sh

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+#!/bin/sh -e
+
+PROJECT="libcoap"
+
+AUTOGEN_FILES="INSTALL \
+		aclocal.m4 ar-lib \
+		coap_config.h coap_config.h.in* compile config.guess config.h* config.log config.status config.sub configure \
+		depcomp \
+		install-sh \
+		libtool ltmain.sh \
+		missing \
+		Makefile Makefile.in \
+		stamp-h1 src/.dirstamp libcoap*.la* src/*.lo"
+
+AUTOGEN_DIRS=".deps .libs autom4te.cache/ m4/ src/.libs/ src/.deps/"
+
+if [ "$1" = "--clean" ]; then
+    echo "removing autogerated files ..."
+    rm -rf $AUTOGEN_FILES $AUTOGEN_DIRS
+    echo "done"
+    exit
+else
+    echo "[HINT] You can run 'autogen.sh --clean' to remove all generated files by the autotools."
+    echo
+fi
+
+test -n "$srcdir" || srcdir=`dirname "$0"`
+test -n "$srcdir" || srcdir=.
+
+echo "Generating needed autotools files for $PROJECT by running autoreconf ..."
+autoreconf --force --install --verbose "$srcdir"
+
+echo
+echo "You can now run 'configure --help' to see possible configuration options."
+echo "Otherwise process the configure script to create the makefiles and generated helper files."
+echo

configure.ac

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+# configure.ac for the libcoap package
+#
+# Copyright (C) 2010-2015 Olaf Bergmann <bergmann@tzi.org>
+#           (C)      2015 Carsten Schoenert <c.schoenert@t-online.de>
+#
+# Please run 'autogen.sh' to let autoconf produce a configure script.
+
+AC_INIT([libcoap], [4.1.2], [libcoap-developers@lists.sourceforge.net], [libcoap], [http://libcoap.sourceforge.net/])
+AC_PREREQ([2.59])
+AM_INIT_AUTOMAKE([1.10 -Wall no-define])
+
+# Generate one configuration header file for building the library itself with
+# an autogenerated template. We need later a second one (include/libcoap.h)
+# that will be installed alongside the library.
+AC_CONFIG_HEADERS([coap_config.h])
+
+AC_PROG_CC
+AM_PROG_AR
+AC_CONFIG_MACRO_DIR([m4])
+LT_INIT([disable-static])
+
+# Check for needed additional programs
+# FIXME! Switch to configure section?
+AC_PATH_PROG(DOXYGEN, doxygen, [:])
+
+# Checks for header files.
+AC_CHECK_HEADERS([assert.h arpa/inet.h limits.h netdb.h netinet/in.h \
+                  stdlib.h string.h strings.h sys/socket.h sys/time.h \
+                  time.h unistd.h sys/unistd.h syslog.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_TYPE_SIZE_T
+AC_TYPE_SSIZE_T
+
+# Checks for library functions.
+AC_FUNC_MALLOC
+AC_CHECK_FUNCS([memset select socket strcasecmp strrchr getaddrinfo \
+                strnlen])
+
+# Override the various template files, currently just one makefile.
+AC_CONFIG_FILES([Makefile])
+
+AC_OUTPUT
+
+AC_MSG_RESULT([
+libcoap configuration summary:
+      libcoap package version : 4.1.2
+]);