Switch to autotools (#163)

This was largely copied from the i3 configure.ac and Makefile.am.
8 years ago · ef4f9e4057
--- a/.gitignore
+++ b/.gitignore
@ -1,4 +1,31 @@
 i3lock
 /i3lock
 *.o
 tags
 *.swp
 ################################################################################
 # https://raw.githubusercontent.com/github/gitignore/master/Autotools.gitignore
 ################################################################################
 # http://www.gnu.org/software/automake
 Makefile.in
 /ar-lib
 /test-driver
 # http://www.gnu.org/software/autoconf
 /autom4te.cache
 /autoscan.log
 /autoscan-*.log
 /aclocal.m4
 /compile
 /config.h.in
 /config.guess
 /config.sub
 /configure
 /configure.scan
 /depcomp
 /install-sh
 /missing
 /stamp-h1
--- a/.travis.yml
+++ b/.travis.yml
@ -25,5 +25,5 @@ before_install:
  - sudo apt-get update
  - sudo apt-get --force-yes -y install -t xenial libxkbcommon-dev libxkbcommon-x11-dev
 script:
  - make -j
  - autoreconf -fi && mkdir -p build && cd build && (../configure || (cat config.log; false)) && make -j CFLAGS="-Wformat -Wformat-security -Wextra -Wno-unused-parameter -Werror"
  - clang-format-3.5 -i *.[ch] && git diff --exit-code || (echo 'Code was not formatted using clang-format!'; false)
--- a/+ 0
+++ b/+ 0
@ -1,67 +0,0 @@
 TOPDIR=$(shell pwd)
 UNAME=$(shell uname)
 INSTALL=install
 PREFIX=/usr
 SYSCONFDIR=/etc
 PKG_CONFIG=pkg-config
 # Check if pkg-config is installed, we need it for building CFLAGS/LIBS
 ifeq ($(shell which $(PKG_CONFIG) 2>/dev/null 1>/dev/null || echo 1),1)
 $(error "$(PKG_CONFIG) was not found")
 endif
 CFLAGS += -std=c99
 CFLAGS += -pipe
 CFLAGS += -Wall
 CPPFLAGS += -D_GNU_SOURCE
 CFLAGS += $(shell $(PKG_CONFIG) --cflags cairo xcb-xinerama xcb-randr xcb-atom xcb-image xcb-xkb xkbcommon xkbcommon-x11)
 LIBS += $(shell $(PKG_CONFIG) --libs cairo xcb-xinerama xcb-randr xcb-atom xcb-image xcb-xkb xkbcommon xkbcommon-x11)
 LIBS += -lev
 LIBS += -lm
 # OpenBSD lacks PAM, use bsd_auth(3) instead.
 ifneq ($(UNAME),OpenBSD)
  LIBS += -lpam
 endif
 FILES:=$(wildcard *.c)
 FILES:=$(FILES:.c=.o)
 ifeq ($(wildcard .git),)
  # not in git repository
  VERSION := $(shell [ -f $(TOPDIR)/I3LOCK_VERSION ] && cat $(TOPDIR)/I3LOCK_VERSION | cut -d '-' -f 1)
  I3LOCK_VERSION:='$(shell [ -f $(TOPDIR)/I3LOCK_VERSION ] && cat $(TOPDIR)/I3LOCK_VERSION)'
 else
  VERSION:=$(shell git describe --tags --abbrev=0)
  I3LOCK_VERSION:="$(shell git describe --tags --always) ($(shell git log --pretty=format:%cd --date=short -n1))"
 endif
 CPPFLAGS += -DVERSION=\"${I3LOCK_VERSION}\"
 .PHONY: install clean uninstall
 all: i3lock
 i3lock: ${FILES}
 	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 clean:
 	rm -f i3lock ${FILES} i3lock-${VERSION}.tar.gz
 install: all
 	$(INSTALL) -d $(DESTDIR)$(PREFIX)/bin
 	$(INSTALL) -d $(DESTDIR)$(SYSCONFDIR)/pam.d
 	$(INSTALL) -m 755 i3lock $(DESTDIR)$(PREFIX)/bin/i3lock
 	$(INSTALL) -m 644 i3lock.pam $(DESTDIR)$(SYSCONFDIR)/pam.d/i3lock
 uninstall:
 	rm -f $(DESTDIR)$(PREFIX)/bin/i3lock
 dist: clean
 	[ ! -d i3lock-${VERSION} ] || rm -rf i3lock-${VERSION}
 	[ ! -e i3lock-${VERSION}.tar.bz2 ] || rm i3lock-${VERSION}.tar.bz2
 	mkdir i3lock-${VERSION}
 	cp *.c *.h i3lock.1 i3lock.pam Makefile LICENSE README.md CHANGELOG i3lock-${VERSION}
 	sed -e 's/^\s*I3LOCK_VERSION:=\(.*\)/I3LOCK_VERSION:=$(shell /bin/echo '${I3LOCK_VERSION}' | sed 's/\\/\\\\/g')/g;s/^VERSION:=\(.*\)/VERSION:=${VERSION}/g' Makefile > i3lock-${VERSION}/Makefile
 	tar cfj i3lock-${VERSION}.tar.bz2 i3lock-${VERSION}
 	rm -rf i3lock-${VERSION}
--- a/Makefile.am
+++ b/Makefile.am
@ -0,0 +1,53 @@
@CODE_COVERAGE_RULES@
 echo-version:
 	@echo "@I3LOCK_VERSION@"
 bin_PROGRAMS = i3lock
 dist_man1_MANS = i3lock.1
 pamddir = $(sysconfdir)/pam.d
 pamd_files = pam/i3lock
 pamd_DATA = $(pamd_files)
 AM_CPPFLAGS = \
 	@AX_EXTEND_SRCDIR_CPPFLAGS@
 i3lock_CFLAGS = \
 	$(AM_CFLAGS) \
 	$(XCB_CFLAGS) \
 	$(XCB_IMAGE_CFLAGS) \
 	$(XCB_UTIL_CFLAGS) \
 	$(XKBCOMMON_CFLAGS) \
 	$(CAIRO_CFLAGS) \
 	$(CODE_COVERAGE_CFLAGS)
 i3lock_CPPFLAGS = \
 	$(AM_CPPFLAGS) \
 	$(CODE_COVERAGE_CPPFLAGS)
 i3lock_LDADD = \
 	$(XCB_LIBS) \
 	$(XCB_IMAGE_LIBS) \
 	$(XCB_UTIL_LIBS) \
 	$(XKBCOMMON_LIBS) \
 	$(CAIRO_LIBS) \
 	$(CODE_COVERAGE_LDFLAGS)
 i3lock_SOURCES = \
 	cursors.h \
 	i3lock.c \
 	i3lock.h \
 	randr.c \
 	randr.h \
 	unlock_indicator.c \
 	unlock_indicator.h \
 	xcb.c \
 	xcb.h
 EXTRA_DIST = \
 	$(pamd_files) \
 	CHANGELOG \
 	LICENSE \
 	README.md
--- a/configure.ac
+++ b/configure.ac
@ -0,0 +1,145 @@
 #                                               -*- Autoconf -*-
 # Run autoreconf -fi to generate a configure script from this file.
 AC_PREREQ([2.69])
 AC_INIT([i3lock], [2.10], [https://github.com/i3/i3lock/issues])
 # For AX_EXTEND_SRCDIR
 AX_ENABLE_BUILDDIR
 AM_INIT_AUTOMAKE([foreign subdir-objects -Wall no-dist-gzip dist-bzip2])
 # Default to silent rules, use V=1 to get verbose compilation output.
 AM_SILENT_RULES([yes])
 # Make it possible to disable maintainer mode to disable re-generation of build
 # system files.
 AM_MAINTAINER_MODE([enable])
 AC_CONFIG_SRCDIR([i3lock.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 dnl Verify macros defined in m4/ such as AX_SANITIZERS are not present in the
 dnl output, i.e. are replaced as expected. This line results in a better error
 dnl message when using aclocal < 1.13 (which does not understand
 dnl AC_CONFIG_MACRO_DIR) without passing the -I m4 parameter.
 m4_pattern_forbid([AX_SANITIZERS])
 # Verify we are using GNU make because we use '%'-style pattern rules in
 # Makefile.am, which are a GNU make extension. Pull requests to replace
 # '%'-style pattern rules with a more portable alternative are welcome.
 AX_CHECK_GNU_MAKE
 AS_VAR_IF([_cv_gnu_make_command], [""], [AC_MSG_ERROR([the i3lock Makefile.am requires GNU make])])
 AX_EXTEND_SRCDIR
 AS_IF([test -d ${srcdir}/.git],
      [
        VERSION="$(git -C ${srcdir} describe --tags --abbrev=0)"
        I3LOCK_VERSION="$(git -C ${srcdir} describe --tags --always) ($(git -C ${srcdir} log --pretty=format:%cd --date=short -n1), branch \\\"$(git -C ${srcdir} describe --tags --always --all | sed s:heads/::)\\\")"
        # Mirrors what libi3/is_debug_build.c does:
        is_release=$(test $(echo "${I3LOCK_VERSION}" | cut -d '(' -f 1 | wc -m) -lt 10 && echo yes || echo no)
      ],
      [
        VERSION="$(cut -d '-' -f 1 ${srcdir}/I3LOCK_VERSION | cut -d ' ' -f 1)"
        I3LOCK_VERSION="$(sed -e 's/@<:@\"?\\@:>@/\\&/g' ${srcdir}/I3LOCK_VERSION)"
        is_release="$(grep -q non-git ${srcdir}/I3LOCK_VERSION && echo no || echo yes)"
      ])
 AC_SUBST([I3LOCK_VERSION], [$I3LOCK_VERSION])
 AC_DEFINE_UNQUOTED([I3LOCK_VERSION], ["${I3LOCK_VERSION}"], [i3lock version])
 AX_CODE_COVERAGE
 dnl is_release must be lowercase because AX_CHECK_ENABLE_DEBUG calls m4_tolower
 dnl on its fourth argument.
 AX_CHECK_ENABLE_DEBUG([yes], , [UNUSED_NDEBUG], [$is_release])
 AC_PROG_CC_C99
 # For strnlen() and vasprintf().
 AC_USE_SYSTEM_EXTENSIONS
 # Checks for typedefs, structures, and compiler characteristics.
 AC_CHECK_HEADER_STDBOOL
 dnl The error message should include the specific type which could not be
 dnl found, but I do not see a way to achieve that.
 AC_CHECK_TYPES([mode_t, off_t, pid_t, size_t, ssize_t], , [AC_MSG_FAILURE([cannot find required type])])
 # Checks for library functions.
 AC_FUNC_FORK
 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
 AC_FUNC_STRNLEN
 AC_CHECK_FUNCS([atexit dup2 ftruncate getcwd gettimeofday localtime_r memchr memset mkdir rmdir setlocale socket strcasecmp strchr strdup strerror strncasecmp strndup strrchr strspn strstr strtol strtoul], , [AC_MSG_FAILURE([cannot find the $ac_func function, which i3lock requires])])
 # Checks for libraries.
 AC_SEARCH_LIBS([floor], [m], , [AC_MSG_FAILURE([cannot find the required floor() function despite trying to link with -lm])])
 # libev does not ship with a pkg-config file :(.
 AC_SEARCH_LIBS([ev_run], [ev], , [AC_MSG_FAILURE([cannot find the required ev_run() function despite trying to link with -lev])])
 AC_SEARCH_LIBS([shm_open], [rt])
 AC_SEARCH_LIBS([pam_authenticate], [pam])
 AC_SEARCH_LIBS([iconv_open], [iconv], , [AC_MSG_FAILURE([cannot find the required iconv_open() function despite trying to link with -liconv])])
 dnl Each prefix corresponds to a source tarball which users might have
 dnl downloaded in a newer version and would like to overwrite.
 PKG_CHECK_MODULES([XCB], [xcb xcb-xkb xcb-xinerama xcb-randr])
 PKG_CHECK_MODULES([XCB_IMAGE], [xcb-image])
 PKG_CHECK_MODULES([XCB_UTIL], [xcb-event xcb-util xcb-atom])
 PKG_CHECK_MODULES([XKBCOMMON], [xkbcommon xkbcommon-x11])
 PKG_CHECK_MODULES([CAIRO], [cairo])
 # Checks for programs.
 AC_PROG_AWK
 AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AC_PROG_RANLIB
 AC_PROG_LN_S
 AM_PROG_AR
 AX_FLAGS_WARN_ALL
 AX_CHECK_COMPILE_FLAG([-Wunused-value], [AX_APPEND_FLAG([-Wunused-value], [AM_CFLAGS])])
 AC_SUBST(AM_CFLAGS)
 # Checks for header files.
 AC_CHECK_HEADERS([fcntl.h float.h inttypes.h limits.h locale.h netinet/in.h paths.h stddef.h stdint.h stdlib.h string.h sys/param.h sys/socket.h sys/time.h unistd.h], , [AC_MSG_FAILURE([cannot find the $ac_header header, which i3lock requires])])
 AC_CONFIG_FILES([Makefile])
 # Enable address sanitizer for non-release builds. The performance hit is a
 # 50% increase of wallclock time for the testsuite on my machine.
 if test x$is_release = xyes; then
 	default_sanitizers=
 else
 	default_sanitizers=address
 fi
 AX_SANITIZERS(, [$default_sanitizers], [AC_DEFINE([I3LOCK_ASAN_ENABLED], [], [Enable ASAN])])
 AC_OUTPUT
 in_git_worktree=`git rev-parse --is-inside-work-tree 2>/dev/null`
 if [[ "$in_git_worktree" = "true" ]]; then
 	git_dir=`git rev-parse --git-dir 2>/dev/null`
 	srcdir=`dirname "$git_dir"`
 	exclude_dir=`pwd | sed "s,^$srcdir,,g"`
 	if ! grep -q "^$exclude_dir" "$git_dir/info/exclude"; then
 		echo "$exclude_dir" >> "$git_dir/info/exclude"
 	fi
 fi
 echo \
 "--------------------------------------------------------------------------------
 build configured:
 AS_HELP_STRING([i3lock version:], [`echo ${I3LOCK_VERSION} | sed 's,\\\\,,g'`])
 AS_HELP_STRING([is release version:], [${is_release}])
 AS_HELP_STRING([enable debug flags:], [${ax_enable_debug}])
 AS_HELP_STRING([code coverage:], [${CODE_COVERAGE_ENABLED}])
 AS_HELP_STRING([enabled sanitizers:], [${ax_enabled_sanitizers}])
 To compile, run:
  cd `pwd` && make -j8
 --------------------------------------------------------------------------------"
--- a/i3lock.c
+++ b/i3lock.c
@ -6,6 +6,8 @@
 * See LICENSE for licensing information
 *
 */
 #include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <pwd.h>
@ -178,7 +180,7 @@ static void clear_password_memory(void) {
    /* A volatile pointer to the password buffer to prevent the compiler from
     * optimizing this out. */
    volatile char *vpassword = password;
    for (int c = 0; c < sizeof(password); c++)
    for (size_t c = 0; c < sizeof(password); c++)
        /* We store a non-random pattern which consists of the (irrelevant)
         * index plus (!) the value of the beep variable. This prevents the
         * compiler from optimizing the calls away, since the value of 'beep'
@ -486,7 +488,7 @@ static void handle_key_press(xcb_key_press_event_t *event) {
            return;
    }
    if ((input_position + 8) >= sizeof(password))
    if ((input_position + 8) >= (int)sizeof(password))
        return;
 #if 0
@ -852,7 +854,7 @@ int main(int argc, char *argv[]) {
    while ((o = getopt_long(argc, argv, optstring, longopts, &longoptind)) != -1) {
        switch (o) {
            case 'v':
                errx(EXIT_SUCCESS, "version " VERSION " © 2010 Michael Stapelberg");
                errx(EXIT_SUCCESS, "version " I3LOCK_VERSION " © 2010 Michael Stapelberg");
            case 'n':
                dont_fork = true;
                break;
--- a/m4/ax_append_flag.m4
+++ b/m4/ax_append_flag.m4
@ -0,0 +1,71 @@
 # ===========================================================================
 #      http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
 #
 # DESCRIPTION
 #
 #   FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
 #   added in between.
 #
 #   If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
 #   CFLAGS) is used.  FLAGS-VARIABLE is not changed if it already contains
 #   FLAG.  If FLAGS-VARIABLE is unset in the shell, it is set to exactly
 #   FLAG.
 #
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
 #   This program 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 of the License, or (at your
 #   option) any later version.
 #
 #   This program 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 program. If not, see <http://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 #serial 6
 AC_DEFUN([AX_APPEND_FLAG],
 [dnl
 AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
 AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
 AS_VAR_SET_IF(FLAGS,[
  AS_CASE([" AS_VAR_GET(FLAGS) "],
    [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
    [
     AS_VAR_APPEND(FLAGS,[" $1"])
     AC_RUN_LOG([: FLAGS="$FLAGS"])
    ])
  ],
  [
  AS_VAR_SET(FLAGS,[$1])
  AC_RUN_LOG([: FLAGS="$FLAGS"])
  ])
 AS_VAR_POPDEF([FLAGS])dnl
 ])dnl AX_APPEND_FLAG
--- a/m4/ax_cflags_warn_all.m4
+++ b/m4/ax_cflags_warn_all.m4
@ -0,0 +1,122 @@
 # ===========================================================================
 #    http://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CFLAGS_WARN_ALL   [(shellvar [,default, [A/NA]])]
 #   AX_CXXFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
 #   AX_FCFLAGS_WARN_ALL  [(shellvar [,default, [A/NA]])]
 #
 # DESCRIPTION
 #
 #   Try to find a compiler option that enables most reasonable warnings.
 #
 #   For the GNU compiler it will be -Wall (and -ansi -pedantic) The result
 #   is added to the shellvar being CFLAGS, CXXFLAGS, or FCFLAGS by default.
 #
 #   Currently this macro knows about the GCC, Solaris, Digital Unix, AIX,
 #   HP-UX, IRIX, NEC SX-5 (Super-UX 10), Cray J90 (Unicos 10.0.0.8), and
 #   Intel compilers.  For a given compiler, the Fortran flags are much more
 #   experimental than their C equivalents.
 #
 #    - $1 shell-variable-to-add-to : CFLAGS, CXXFLAGS, or FCFLAGS
 #    - $2 add-value-if-not-found : nothing
 #    - $3 action-if-found : add value to shellvariable
 #    - $4 action-if-not-found : nothing
 #
 #   NOTE: These macros depend on AX_APPEND_FLAG.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2010 Rhys Ulerich <rhys.ulerich@gmail.com>
 #
 #   This program 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 of the License, or (at your
 #   option) any later version.
 #
 #   This program 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 program. If not, see <http://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 #serial 15
 AC_DEFUN([AX_FLAGS_WARN_ALL],[dnl
 AS_VAR_PUSHDEF([FLAGS],[_AC_LANG_PREFIX[]FLAGS])dnl
 AS_VAR_PUSHDEF([VAR],[ac_cv_[]_AC_LANG_ABBREV[]flags_warn_all])dnl
 AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
 VAR,[VAR="no, unknown"
 ac_save_[]FLAGS="$[]FLAGS"
 for ac_arg dnl
 in "-warn all  % -warn all"   dnl Intel
   "-pedantic  % -Wall"       dnl GCC
   "-xstrconst % -v"          dnl Solaris C
   "-std1      % -verbose -w0 -warnprotos" dnl Digital Unix
   "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
   "-ansi -ansiE % -fullwarn" dnl IRIX
   "+ESlit     % +w1"         dnl HP-UX C
   "-Xc        % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
   "-h conform % -h msglevel 2" dnl Cray C (Unicos)
   #
 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM],
                     [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
 done
 FLAGS="$ac_save_[]FLAGS"
 ])
 AS_VAR_POPDEF([FLAGS])dnl
 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
 case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;;
   *) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;;
 esac
 AS_VAR_POPDEF([VAR])dnl
 ])dnl AX_FLAGS_WARN_ALL
 dnl  implementation tactics:
 dnl   the for-argument contains a list of options. The first part of
 dnl   these does only exist to detect the compiler - usually it is
 dnl   a global option to enable -ansi or -extrawarnings. All other
 dnl   compilers will fail about it. That was needed since a lot of
 dnl   compilers will give false positives for some option-syntax
 dnl   like -Woption or -Xoption as they think of it is a pass-through
 dnl   to later compile stages or something. The "%" is used as a
 dnl   delimiter. A non-option comment can be given after "%%" marks
 dnl   which will be shown but not added to the respective C/CXXFLAGS.
 AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
 AC_LANG_PUSH([C])
 AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
 AC_LANG_POP([C])
 ])
 AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
 AC_LANG_PUSH([C++])
 AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
 AC_LANG_POP([C++])
 ])
 AC_DEFUN([AX_FCFLAGS_WARN_ALL],[dnl
 AC_LANG_PUSH([Fortran])
 AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
 AC_LANG_POP([Fortran])
 ])
--- a/m4/ax_check_compile_flag.m4
+++ b/m4/ax_check_compile_flag.m4
@ -0,0 +1,74 @@
 # ===========================================================================
 #   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
 #   Check whether the given FLAG works with the current language's compiler
 #   or gives an error.  (Warnings, however, are ignored)
 #
 #   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
 #   success/failure.
 #
 #   If EXTRA-FLAGS is defined, it is added to the current language's default
 #   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
 #   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
 #
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
 #   This program 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 of the License, or (at your
 #   option) any later version.
 #
 #   This program 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 program. If not, see <http://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 #serial 4
 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
 [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
    [AS_VAR_SET(CACHEVAR,[yes])],
    [AS_VAR_SET(CACHEVAR,[no])])
  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
 AS_VAR_IF(CACHEVAR,yes,
  [m4_default([$2], :)],
  [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
 ])dnl AX_CHECK_COMPILE_FLAGS
--- a/m4/ax_check_enable_debug.m4
+++ b/m4/ax_check_enable_debug.m4
@ -0,0 +1,124 @@
 # ===========================================================================
 #   http://www.gnu.org/software/autoconf-archive/ax_check_enable_debug.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CHECK_ENABLE_DEBUG([enable by default=yes/info/profile/no], [ENABLE DEBUG VARIABLES ...], [DISABLE DEBUG VARIABLES NDEBUG ...], [IS-RELEASE])
 #
 # DESCRIPTION
 #
 #   Check for the presence of an --enable-debug option to configure, with
 #   the specified default value used when the option is not present.  Return
 #   the value in the variable $ax_enable_debug.
 #
 #   Specifying 'yes' adds '-g -O0' to the compilation flags for all
 #   languages. Specifying 'info' adds '-g' to the compilation flags.
 #   Specifying 'profile' adds '-g -pg' to the compilation flags and '-pg' to
 #   the linking flags. Otherwise, nothing is added.
 #
 #   Define the variables listed in the second argument if debug is enabled,
 #   defaulting to no variables.  Defines the variables listed in the third
 #   argument if debug is disabled, defaulting to NDEBUG.  All lists of
 #   variables should be space-separated.
 #
 #   If debug is not enabled, ensure AC_PROG_* will not add debugging flags.
 #   Should be invoked prior to any AC_PROG_* compiler checks.
 #
 #   IS-RELEASE can be used to change the default to 'no' when making a
 #   release.  Set IS-RELEASE to 'yes' or 'no' as appropriate. By default, it
 #   uses the value of $ax_is_release, so if you are using the AX_IS_RELEASE
 #   macro, there is no need to pass this parameter.
 #
 #     AX_IS_RELEASE([git-directory])
 #     AX_CHECK_ENABLE_DEBUG()
 #
 # LICENSE
 #
 #   Copyright (c) 2011 Rhys Ulerich <rhys.ulerich@gmail.com>
 #   Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved.
 #serial 5
 AC_DEFUN([AX_CHECK_ENABLE_DEBUG],[
    AC_BEFORE([$0],[AC_PROG_CC])dnl
    AC_BEFORE([$0],[AC_PROG_CXX])dnl
    AC_BEFORE([$0],[AC_PROG_F77])dnl
    AC_BEFORE([$0],[AC_PROG_FC])dnl
    AC_MSG_CHECKING(whether to enable debugging)
    ax_enable_debug_default=m4_tolower(m4_normalize(ifelse([$1],,[no],[$1])))
    ax_enable_debug_is_release=m4_tolower(m4_normalize(ifelse([$4],,
                                                              [$ax_is_release],
                                                              [$4])))
    # If this is a release, override the default.
    AS_IF([test "$ax_enable_debug_is_release" = "yes"],
      [ax_enable_debug_default="no"])
    m4_define(ax_enable_debug_vars,[m4_normalize(ifelse([$2],,,[$2]))])
    m4_define(ax_disable_debug_vars,[m4_normalize(ifelse([$3],,[NDEBUG],[$3]))])
    AC_ARG_ENABLE(debug,
 	[AS_HELP_STRING([--enable-debug=]@<:@yes/info/profile/no@:>@,[compile with debugging])],
 	[],enable_debug=$ax_enable_debug_default)
    # empty mean debug yes
    AS_IF([test "x$enable_debug" = "x"],
      [enable_debug="yes"])
    # case of debug
    AS_CASE([$enable_debug],
      [yes],[
 	AC_MSG_RESULT(yes)
 	CFLAGS="${CFLAGS} -g -O0"
 	CXXFLAGS="${CXXFLAGS} -g -O0"
 	FFLAGS="${FFLAGS} -g -O0"
 	FCFLAGS="${FCFLAGS} -g -O0"
 	OBJCFLAGS="${OBJCFLAGS} -g -O0"
      ],
      [info],[
 	AC_MSG_RESULT(info)
 	CFLAGS="${CFLAGS} -g"
 	CXXFLAGS="${CXXFLAGS} -g"
 	FFLAGS="${FFLAGS} -g"
 	FCFLAGS="${FCFLAGS} -g"
 	OBJCFLAGS="${OBJCFLAGS} -g"
      ],
      [profile],[
 	AC_MSG_RESULT(profile)
 	CFLAGS="${CFLAGS} -g -pg"
 	CXXFLAGS="${CXXFLAGS} -g -pg"
 	FFLAGS="${FFLAGS} -g -pg"
 	FCFLAGS="${FCFLAGS} -g -pg"
 	OBJCFLAGS="${OBJCFLAGS} -g -pg"
 	LDFLAGS="${LDFLAGS} -pg"
      ],
      [
 	AC_MSG_RESULT(no)
 	dnl Ensure AC_PROG_CC/CXX/F77/FC/OBJC will not enable debug flags
 	dnl by setting any unset environment flag variables
 	AS_IF([test "x${CFLAGS+set}" != "xset"],
 	  [CFLAGS=""])
 	AS_IF([test "x${CXXFLAGS+set}" != "xset"],
 	  [CXXFLAGS=""])
 	AS_IF([test "x${FFLAGS+set}" != "xset"],
 	  [FFLAGS=""])
 	AS_IF([test "x${FCFLAGS+set}" != "xset"],
 	  [FCFLAGS=""])
 	AS_IF([test "x${OBJCFLAGS+set}" != "xset"],
 	  [OBJCFLAGS=""])
      ])
    dnl Define various variables if debugging is disabled.
    dnl assert.h is a NOP if NDEBUG is defined, so define it by default.
    AS_IF([test "x$enable_debug" = "xyes"],
      [m4_map_args_w(ax_enable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is enabled])])],
      [m4_map_args_w(ax_disable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is disabled])])])
    ax_enable_debug=$enable_debug
 ])
--- a/m4/ax_check_gnu_make.m4
+++ b/m4/ax_check_gnu_make.m4
@ -0,0 +1,84 @@
 # ===========================================================================
 #     http://www.gnu.org/software/autoconf-archive/ax_check_gnu_make.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CHECK_GNU_MAKE()
 #
 # DESCRIPTION
 #
 #   This macro searches for a GNU version of make. If a match is found:
 #
 #     * The makefile variable `ifGNUmake' is set to the empty string, otherwise
 #       it is set to "#". This is useful for including a special features in a
 #       Makefile, which cannot be handled by other versions of make.
 #     * The variable `_cv_gnu_make_command` is set to the command to invoke
 #       GNU make if it exists, the empty string otherwise.
 #     * The variable `ax_cv_gnu_make_command` is set to the command to invoke
 #       GNU make by copying `_cv_gnu_make_command`, otherwise it is unset.
 #     * If GNU Make is found, its version is extracted from the output of
 #       `make --version` as the last field of a record of space-separated
 #       columns and saved into the variable `ax_check_gnu_make_version`.
 #
 #   Here is an example of its use:
 #
 #   Makefile.in might contain:
 #
 #     # A failsafe way of putting a dependency rule into a makefile
 #     $(DEPEND):
 #             $(CC) -MM $(srcdir)/*.c > $(DEPEND)
 #
 #     @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
 #     @ifGNUmake@ include $(DEPEND)
 #     @ifGNUmake@ endif
 #
 #   Then configure.in would normally contain:
 #
 #     AX_CHECK_GNU_MAKE()
 #     AC_OUTPUT(Makefile)
 #
 #   Then perhaps to cause gnu make to override any other make, we could do
 #   something like this (note that GNU make always looks for GNUmakefile
 #   first):
 #
 #     if  ! test x$_cv_gnu_make_command = x ; then
 #             mv Makefile GNUmakefile
 #             echo .DEFAULT: > Makefile ;
 #             echo \  $_cv_gnu_make_command \$@ >> Makefile;
 #     fi
 #
 #   Then, if any (well almost any) other make is called, and GNU make also
 #   exists, then the other make wraps the GNU make.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
 #   Copyright (c) 2015 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 #serial 8
 AC_DEFUN([AX_CHECK_GNU_MAKE],dnl
  [AC_PROG_AWK
  AC_CACHE_CHECK([for GNU make],[_cv_gnu_make_command],[dnl
    _cv_gnu_make_command="" ;
 dnl Search all the common names for GNU make
    for a in "$MAKE" make gmake gnumake ; do
      if test -z "$a" ; then continue ; fi ;
      if "$a" --version 2> /dev/null | grep GNU 2>&1 > /dev/null ; then
        _cv_gnu_make_command=$a ;
        AX_CHECK_GNU_MAKE_HEADLINE=$("$a" --version 2> /dev/null | grep "GNU Make")
        ax_check_gnu_make_version=$(echo ${AX_CHECK_GNU_MAKE_HEADLINE} | ${AWK} -F " " '{ print $(NF); }')
        break ;
      fi
    done ;])
 dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
  AS_VAR_IF([_cv_gnu_make_command], [""], [AS_VAR_SET([ifGNUmake], ["#"])],   [AS_VAR_SET([ifGNUmake], [""])])
  AS_VAR_IF([_cv_gnu_make_command], [""], [AS_UNSET(ax_cv_gnu_make_command)], [AS_VAR_SET([ax_cv_gnu_make_command], [${_cv_gnu_make_command}])])
  AC_SUBST([ifGNUmake])
 ])
--- a/m4/ax_check_link_flag.m4
+++ b/m4/ax_check_link_flag.m4
@ -0,0 +1,74 @@
 # ===========================================================================
 #    http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
 #   Check whether the given FLAG works with the linker or gives an error.
 #   (Warnings, however, are ignored)
 #
 #   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
 #   success/failure.
 #
 #   If EXTRA-FLAGS is defined, it is added to the linker's default flags
 #   when the check is done.  The check is thus made with the flags: "LDFLAGS
 #   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
 #   issue an error when a bad flag is given.
 #
 #   INPUT gives an alternative input source to AC_LINK_IFELSE.
 #
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
 #   This program 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 of the License, or (at your
 #   option) any later version.
 #
 #   This program 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 program. If not, see <http://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 #serial 4
 AC_DEFUN([AX_CHECK_LINK_FLAG],
 [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
 AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
  ax_check_save_flags=$LDFLAGS
  LDFLAGS="$LDFLAGS $4 $1"
  AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
    [AS_VAR_SET(CACHEVAR,[yes])],
    [AS_VAR_SET(CACHEVAR,[no])])
  LDFLAGS=$ax_check_save_flags])
 AS_VAR_IF(CACHEVAR,yes,
  [m4_default([$2], :)],
  [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
 ])dnl AX_CHECK_LINK_FLAGS
--- a/m4/ax_code_coverage.m4
+++ b/m4/ax_code_coverage.m4
@ -0,0 +1,273 @@
 # ===========================================================================
 #     http://www.gnu.org/software/autoconf-archive/ax_code_coverage.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CODE_COVERAGE()
 #
 # DESCRIPTION
 #
 #   Defines CODE_COVERAGE_CPPFLAGS, CODE_COVERAGE_CFLAGS,
 #   CODE_COVERAGE_CXXFLAGS and CODE_COVERAGE_LDFLAGS which should be
 #   included in the CPPFLAGS, CFLAGS CXXFLAGS and LIBS/LDFLAGS variables of
 #   every build target (program or library) which should be built with code
 #   coverage support. Also defines CODE_COVERAGE_RULES which should be
 #   substituted in your Makefile; and $enable_code_coverage which can be
 #   used in subsequent configure output. CODE_COVERAGE_ENABLED is defined
 #   and substituted, and corresponds to the value of the
 #   --enable-code-coverage option, which defaults to being disabled.
 #
 #   Test also for gcov program and create GCOV variable that could be
 #   substituted.
 #
 #   Note that all optimisation flags in CFLAGS must be disabled when code
 #   coverage is enabled.
 #
 #   Usage example:
 #
 #   configure.ac:
 #
 #     AX_CODE_COVERAGE
 #
 #   Makefile.am:
 #
 #     @CODE_COVERAGE_RULES@
 #     my_program_LIBS = ... $(CODE_COVERAGE_LDFLAGS) ...
 #     my_program_CPPFLAGS = ... $(CODE_COVERAGE_CPPFLAGS) ...
 #     my_program_CFLAGS = ... $(CODE_COVERAGE_CFLAGS) ...
 #     my_program_CXXFLAGS = ... $(CODE_COVERAGE_CXXFLAGS) ...
 #
 #   This results in a "check-code-coverage" rule being added to any
 #   Makefile.am which includes "@CODE_COVERAGE_RULES@" (assuming the module
 #   has been configured with --enable-code-coverage). Running `make
 #   check-code-coverage` in that directory will run the module's test suite
 #   (`make check`) and build a code coverage report detailing the code which
 #   was touched, then print the URI for the report.
 #
 #   This code was derived from Makefile.decl in GLib, originally licenced
 #   under LGPLv2.1+.
 #
 # LICENSE
 #
 #   Copyright (c) 2012, 2016 Philip Withnall
 #   Copyright (c) 2012 Xan Lopez
 #   Copyright (c) 2012 Christian Persch
 #   Copyright (c) 2012 Paolo Borelli
 #   Copyright (c) 2012 Dan Winship
 #   Copyright (c) 2015 Bastien ROUCARIES
 #
 #   This library is free software; you can redistribute it and/or modify it
 #   under the terms of the GNU Lesser General Public License as published by
 #   the Free Software Foundation; either version 2.1 of the License, or (at
 #   your option) any later version.
 #
 #   This library is distributed in the hope that it will be useful, but
 #   WITHOUT ANY WARRANTY; without even the implied warranty of
 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 #   General Public License for more details.
 #
 #   You should have received a copy of the GNU Lesser General Public License
 #   along with this program. If not, see <http://www.gnu.org/licenses/>.
 #serial 15
 AC_DEFUN([AX_CODE_COVERAGE],[
 	dnl Check for --enable-code-coverage
 	AC_REQUIRE([AC_PROG_SED])
 	# allow to override gcov location
 	AC_ARG_WITH([gcov],
 	  [AS_HELP_STRING([--with-gcov[=GCOV]], [use given GCOV for coverage (GCOV=gcov).])],
 	  [_AX_CODE_COVERAGE_GCOV_PROG_WITH=$with_gcov],
 	  [_AX_CODE_COVERAGE_GCOV_PROG_WITH=gcov])
 	AC_MSG_CHECKING([whether to build with code coverage support])
 	AC_ARG_ENABLE([code-coverage],
 	  AS_HELP_STRING([--enable-code-coverage],
 	  [Whether to enable code coverage support]),,
 	  enable_code_coverage=no)
 	AM_CONDITIONAL([CODE_COVERAGE_ENABLED], [test x$enable_code_coverage = xyes])
 	AC_SUBST([CODE_COVERAGE_ENABLED], [$enable_code_coverage])
 	AC_MSG_RESULT($enable_code_coverage)
 	AS_IF([ test "$enable_code_coverage" = "yes" ], [
 		# check for gcov
 		AC_CHECK_TOOL([GCOV],
 		  [$_AX_CODE_COVERAGE_GCOV_PROG_WITH],
 		  [:])
 		AS_IF([test "X$GCOV" = "X:"],
 		  [AC_MSG_ERROR([gcov is needed to do coverage])])
 		AC_SUBST([GCOV])
 		dnl Check if gcc is being used
 		AS_IF([ test "$GCC" = "no" ], [
 			AC_MSG_ERROR([not compiling with gcc, which is required for gcov code coverage])
 		])
 		# List of supported lcov versions.
 		lcov_version_list="1.6 1.7 1.8 1.9 1.10 1.11 1.12"
 		AC_CHECK_PROG([LCOV], [lcov], [lcov])
 		AC_CHECK_PROG([GENHTML], [genhtml], [genhtml])
 		AS_IF([ test "$LCOV" ], [
 			AC_CACHE_CHECK([for lcov version], ax_cv_lcov_version, [
 				ax_cv_lcov_version=invalid
 				lcov_version=`$LCOV -v 2>/dev/null | $SED -e 's/^.* //'`
 				for lcov_check_version in $lcov_version_list; do
 					if test "$lcov_version" = "$lcov_check_version"; then
 						ax_cv_lcov_version="$lcov_check_version (ok)"
 					fi
 				done
 			])
 		], [
 			lcov_msg="To enable code coverage reporting you must have one of the following lcov versions installed: $lcov_version_list"
 			AC_MSG_ERROR([$lcov_msg])
 		])
 		case $ax_cv_lcov_version in
 			""|invalid[)]
 				lcov_msg="You must have one of the following versions of lcov: $lcov_version_list (found: $lcov_version)."
 				AC_MSG_ERROR([$lcov_msg])
 				LCOV="exit 0;"
 			;;
 		esac
 		AS_IF([ test -z "$GENHTML" ], [
 			AC_MSG_ERROR([Could not find genhtml from the lcov package])
 		])
 		dnl Build the code coverage flags
 		CODE_COVERAGE_CPPFLAGS="-DNDEBUG"
 		CODE_COVERAGE_CFLAGS="-O0 -g -fprofile-arcs -ftest-coverage"
 		CODE_COVERAGE_CXXFLAGS="-O0 -g -fprofile-arcs -ftest-coverage"
 		CODE_COVERAGE_LDFLAGS="-lgcov"
 		AC_SUBST([CODE_COVERAGE_CPPFLAGS])
 		AC_SUBST([CODE_COVERAGE_CFLAGS])
 		AC_SUBST([CODE_COVERAGE_CXXFLAGS])
 		AC_SUBST([CODE_COVERAGE_LDFLAGS])
 	])
 [CODE_COVERAGE_RULES='
 # Code coverage
 #
 # Optional:
 #  - CODE_COVERAGE_DIRECTORY: Top-level directory for code coverage reporting.
 #    Multiple directories may be specified, separated by whitespace.
 #    (Default: $(top_builddir))
 #  - CODE_COVERAGE_OUTPUT_FILE: Filename and path for the .info file generated
 #    by lcov for code coverage. (Default:
 #    $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info)
 #  - CODE_COVERAGE_OUTPUT_DIRECTORY: Directory for generated code coverage
 #    reports to be created. (Default:
 #    $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage)
 #  - CODE_COVERAGE_BRANCH_COVERAGE: Set to 1 to enforce branch coverage,
 #    set to 0 to disable it and leave empty to stay with the default.
 #    (Default: empty)
 #  - CODE_COVERAGE_LCOV_SHOPTS_DEFAULT: Extra options shared between both lcov
 #    instances. (Default: based on $CODE_COVERAGE_BRANCH_COVERAGE)
 #  - CODE_COVERAGE_LCOV_SHOPTS: Extra options to shared between both lcov
 #    instances. (Default: $CODE_COVERAGE_LCOV_SHOPTS_DEFAULT)
 #  - CODE_COVERAGE_LCOV_OPTIONS_GCOVPATH: --gcov-tool pathtogcov
 #  - CODE_COVERAGE_LCOV_OPTIONS_DEFAULT: Extra options to pass to the
 #    collecting lcov instance. (Default: $CODE_COVERAGE_LCOV_OPTIONS_GCOVPATH)
 #  - CODE_COVERAGE_LCOV_OPTIONS: Extra options to pass to the collecting lcov
 #    instance. (Default: $CODE_COVERAGE_LCOV_OPTIONS_DEFAULT)
 #  - CODE_COVERAGE_LCOV_RMOPTS_DEFAULT: Extra options to pass to the filtering
 #    lcov instance. (Default: empty)
 #  - CODE_COVERAGE_LCOV_RMOPTS: Extra options to pass to the filtering lcov
 #    instance. (Default: $CODE_COVERAGE_LCOV_RMOPTS_DEFAULT)
 #  - CODE_COVERAGE_GENHTML_OPTIONS_DEFAULT: Extra options to pass to the
 #    genhtml instance. (Default: based on $CODE_COVERAGE_BRANCH_COVERAGE)
 #  - CODE_COVERAGE_GENHTML_OPTIONS: Extra options to pass to the genhtml
 #    instance. (Default: $CODE_COVERAGE_GENHTML_OPTIONS_DEFAULT)
 #  - CODE_COVERAGE_IGNORE_PATTERN: Extra glob pattern of files to ignore
 #
 # The generated report will be titled using the $(PACKAGE_NAME) and
 # $(PACKAGE_VERSION). In order to add the current git hash to the title,
 # use the git-version-gen script, available online.
 # Optional variables
 CODE_COVERAGE_DIRECTORY ?= $(top_builddir)
 CODE_COVERAGE_OUTPUT_FILE ?= $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info
 CODE_COVERAGE_OUTPUT_DIRECTORY ?= $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage
 CODE_COVERAGE_BRANCH_COVERAGE ?=
 CODE_COVERAGE_LCOV_SHOPTS_DEFAULT ?= $(if $(CODE_COVERAGE_BRANCH_COVERAGE),\
 --rc lcov_branch_coverage=$(CODE_COVERAGE_BRANCH_COVERAGE))
 CODE_COVERAGE_LCOV_SHOPTS ?= $(CODE_COVERAGE_LCOV_SHOPTS_DEFAULT)
 CODE_COVERAGE_LCOV_OPTIONS_GCOVPATH ?= --gcov-tool "$(GCOV)"
 CODE_COVERAGE_LCOV_OPTIONS_DEFAULT ?= $(CODE_COVERAGE_LCOV_OPTIONS_GCOVPATH)
 CODE_COVERAGE_LCOV_OPTIONS ?= $(CODE_COVERAGE_LCOV_OPTIONS_DEFAULT)
 CODE_COVERAGE_LCOV_RMOPTS_DEFAULT ?=
 CODE_COVERAGE_LCOV_RMOPTS ?= $(CODE_COVERAGE_LCOV_RMOPTS_DEFAULT)
 CODE_COVERAGE_GENHTML_OPTIONS_DEFAULT ?=\
 $(if $(CODE_COVERAGE_BRANCH_COVERAGE),\
 --rc genhtml_branch_coverage=$(CODE_COVERAGE_BRANCH_COVERAGE))
 CODE_COVERAGE_GENHTML_OPTIONS ?= $(CODE_COVERAGE_GENHTML_OPTIONS_DEFAULTS)
 CODE_COVERAGE_IGNORE_PATTERN ?=
 code_coverage_v_lcov_cap = $(code_coverage_v_lcov_cap_$(V))
 code_coverage_v_lcov_cap_ = $(code_coverage_v_lcov_cap_$(AM_DEFAULT_VERBOSITY))
 code_coverage_v_lcov_cap_0 = @echo "  LCOV   --capture"\
 $(CODE_COVERAGE_OUTPUT_FILE);
 code_coverage_v_lcov_ign = $(code_coverage_v_lcov_ign_$(V))
 code_coverage_v_lcov_ign_ = $(code_coverage_v_lcov_ign_$(AM_DEFAULT_VERBOSITY))
 code_coverage_v_lcov_ign_0 = @echo "  LCOV   --remove /tmp/*"\
 $(CODE_COVERAGE_IGNORE_PATTERN);
 code_coverage_v_genhtml = $(code_coverage_v_genhtml_$(V))
 code_coverage_v_genhtml_ = $(code_coverage_v_genhtml_$(AM_DEFAULT_VERBOSITY))
 code_coverage_v_genhtml_0 = @echo "  GEN   " $(CODE_COVERAGE_OUTPUT_DIRECTORY);
 code_coverage_quiet = $(code_coverage_quiet_$(V))
 code_coverage_quiet_ = $(code_coverage_quiet_$(AM_DEFAULT_VERBOSITY))
 code_coverage_quiet_0 = --quiet
 # sanitizes the test-name: replaces with underscores: dashes and dots
 code_coverage_sanitize = $(subst -,_,$(subst .,_,$(1)))
 # Use recursive makes in order to ignore errors during check
 check-code-coverage:
 ifeq ($(CODE_COVERAGE_ENABLED),yes)
 	-$(A''M_V_at)$(MAKE) $(AM_MAKEFLAGS) -k check
 	$(A''M_V_at)$(MAKE) $(AM_MAKEFLAGS) code-coverage-capture
 else
 	@echo "Need to reconfigure with --enable-code-coverage"
 endif
 # Capture code coverage data
 code-coverage-capture: code-coverage-capture-hook
 ifeq ($(CODE_COVERAGE_ENABLED),yes)
 	$(code_coverage_v_lcov_cap)$(LCOV) $(code_coverage_quiet) $(addprefix --directory ,$(CODE_COVERAGE_DIRECTORY)) --capture --output-file "$(CODE_COVERAGE_OUTPUT_FILE).tmp" --test-name "$(call code_coverage_sanitize,$(PACKAGE_NAME)-$(PACKAGE_VERSION))" --no-checksum --compat-libtool $(CODE_COVERAGE_LCOV_SHOPTS) $(CODE_COVERAGE_LCOV_OPTIONS)
 	$(code_coverage_v_lcov_ign)$(LCOV) $(code_coverage_quiet) $(addprefix --directory ,$(CODE_COVERAGE_DIRECTORY)) --remove "$(CODE_COVERAGE_OUTPUT_FILE).tmp" "/tmp/*" $(CODE_COVERAGE_IGNORE_PATTERN) --output-file "$(CODE_COVERAGE_OUTPUT_FILE)" $(CODE_COVERAGE_LCOV_SHOPTS) $(CODE_COVERAGE_LCOV_RMOPTS)
 	-@rm -f $(CODE_COVERAGE_OUTPUT_FILE).tmp
 	$(code_coverage_v_genhtml)LANG=C $(GENHTML) $(code_coverage_quiet) $(addprefix --prefix ,$(CODE_COVERAGE_DIRECTORY)) --output-directory "$(CODE_COVERAGE_OUTPUT_DIRECTORY)" --title "$(PACKAGE_NAME)-$(PACKAGE_VERSION) Code Coverage" --legend --show-details "$(CODE_COVERAGE_OUTPUT_FILE)" $(CODE_COVERAGE_GENHTML_OPTIONS)
 	@echo "file://$(abs_builddir)/$(CODE_COVERAGE_OUTPUT_DIRECTORY)/index.html"
 else
 	@echo "Need to reconfigure with --enable-code-coverage"
 endif
 # Hook rule executed before code-coverage-capture, overridable by the user
 code-coverage-capture-hook:
 ifeq ($(CODE_COVERAGE_ENABLED),yes)
 clean: code-coverage-clean
 code-coverage-clean:
 	-$(LCOV) --directory $(top_builddir) -z
 	-rm -rf $(CODE_COVERAGE_OUTPUT_FILE) $(CODE_COVERAGE_OUTPUT_FILE).tmp $(CODE_COVERAGE_OUTPUT_DIRECTORY)
 	-find . -name "*.gcda" -o -name "*.gcov" -delete
 endif
 GITIGNOREFILES ?=
 GITIGNOREFILES += $(CODE_COVERAGE_OUTPUT_FILE) $(CODE_COVERAGE_OUTPUT_DIRECTORY)
 A''M_DISTCHECK_CONFIGURE_FLAGS ?=
 A''M_DISTCHECK_CONFIGURE_FLAGS += --disable-code-coverage
 .PHONY: check-code-coverage code-coverage-capture code-coverage-capture-hook code-coverage-clean
 ']
 	AC_SUBST([CODE_COVERAGE_RULES])
 	m4_ifdef([_AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE([CODE_COVERAGE_RULES])])
 ])
--- a/m4/ax_configure_args.m4
+++ b/m4/ax_configure_args.m4
@ -0,0 +1,70 @@
 # ===========================================================================
 #     http://www.gnu.org/software/autoconf-archive/ax_configure_args.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CONFIGURE_ARGS
 #
 # DESCRIPTION
 #
 #   Helper macro for AX_ENABLE_BUILDDIR.
 #
 #   The traditional way of starting a subdir-configure is running the script
 #   with ${1+"$@"} but since autoconf 2.60 this is broken. Instead we have
 #   to rely on eval'ing $ac_configure_args however some old autoconf
 #   versions do not provide that. To ensure maximum portability of autoconf
 #   extension macros this helper can be AC_REQUIRE'd so that
 #   $ac_configure_args will alsways be present.
 #
 #   Sadly, the traditional "exec $SHELL" of the enable_builddir macros is
 #   spoiled now and must be replaced by "eval + exit $?".
 #
 #   Example:
 #
 #     AC_DEFUN([AX_ENABLE_SUBDIR],[dnl
 #       AC_REQUIRE([AX_CONFIGURE_ARGS])dnl
 #       eval $SHELL $ac_configure_args || exit $?
 #       ...])
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #
 #   This program is free software; you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
 #   Free Software Foundation; either version 3 of the License, or (at your
 #   option) any later version.
 #
 #   This program is distributed in the hope that it will be useful, but
 #   WITHOUT ANY WARRANTY; without even the implied warranty of
 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
 #   with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 #serial 9
 AC_DEFUN([AX_CONFIGURE_ARGS],[
   # [$]@ is unsable in 2.60+ but earlier autoconf had no ac_configure_args
   if test "${ac_configure_args+set}" != "set" ; then
      ac_configure_args=
      for ac_arg in ${1+"[$]@"}; do
         ac_configure_args="$ac_configure_args '$ac_arg'"
      done
   fi
 ])
--- a/m4/ax_enable_builddir.m4
+++ b/m4/ax_enable_builddir.m4
@ -0,0 +1,302 @@
 # ===========================================================================
 #    http://www.gnu.org/software/autoconf-archive/ax_enable_builddir.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_ENABLE_BUILDDIR [(dirstring-or-command [,Makefile.mk [,-all]])]
 #
 # DESCRIPTION
 #
 #   If the current configure was run within the srcdir then we move all
 #   configure-files into a subdir and let the configure steps continue
 #   there. We provide an option --disable-builddir to suppress the move into
 #   a separate builddir.
 #
 #   Defaults:
 #
 #     $1 = $host (overridden with $HOST)
 #     $2 = Makefile.mk
 #     $3 = -all
 #
 #   This macro must be called before AM_INIT_AUTOMAKE. It creates a default
 #   toplevel srcdir Makefile from the information found in the created
 #   toplevel builddir Makefile. It just copies the variables and
 #   rule-targets, each extended with a default rule-execution that recurses
 #   into the build directory of the current "HOST". You can override the
 #   auto-dection through `config.guess` and build-time of course, as in
 #
 #     make HOST=i386-mingw-cross
 #
 #   which can of course set at configure time as well using
 #
 #     configure --host=i386-mingw-cross
 #
 #   After the default has been created, additional rules can be appended
 #   that will not just recurse into the subdirectories and only ever exist
 #   in the srcdir toplevel makefile - these parts are read from the $2 =
 #   Makefile.mk file
 #
 #   The automatic rules are usually scanning the toplevel Makefile for lines
 #   like '#### $host |$builddir' to recognize the place where to recurse
 #   into. Usually, the last one is the only one used. However, almost all
 #   targets have an additional "*-all" rule which makes the script to
 #   recurse into _all_ variants of the current HOST (!!) setting. The "-all"
 #   suffix can be overriden for the macro as well.
 #
 #   a special rule is only given for things like "dist" that will copy the
 #   tarball from the builddir to the sourcedir (or $(PUB)) for reason of
 #   convenience.
 #
 # LICENSE
 #
 #   Copyright (c) 2009 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
 #
 #   This program 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 of the License, or (at your
 #   option) any later version.
 #
 #   This program 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 program. If not, see <http://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 #serial 25
 AC_DEFUN([AX_ENABLE_BUILDDIR],[
 AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
 AC_REQUIRE([AC_CANONICAL_TARGET])[]dnl
 AC_REQUIRE([AX_CONFIGURE_ARGS])[]dnl
 AC_REQUIRE([AM_AUX_DIR_EXPAND])[]dnl
 AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
 AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
 AS_VAR_PUSHDEF([AUX],[ax_enable_builddir_auxdir])dnl
 AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
 SUB="."
 AC_ARG_ENABLE([builddir], AS_HELP_STRING(
  [--disable-builddir],[disable automatic build in subdir of sources])
  ,[SUB="$enableval"], [SUB="auto"])
 if test ".$ac_srcdir_defaulted" != ".no" ; then
 if test ".$srcdir" = ".." ; then
  if test -f config.status ; then
    AC_MSG_NOTICE(toplevel srcdir already configured... skipping subdir build)
  else
    test ".$SUB" = "."  && SUB="."
    test ".$SUB" = ".no"  && SUB="."
    test ".$TARGET" = "." && TARGET="$target"
    test ".$SUB" = ".auto" && SUB="m4_ifval([$1], [$1],[$TARGET])"
    if test ".$SUB" != ".." ; then    # we know where to go and
      AS_MKDIR_P([$SUB])
      echo __.$SUB.__ > $SUB/conftest.tmp
      cd $SUB
      if grep __.$SUB.__ conftest.tmp >/dev/null 2>/dev/null ; then
        rm conftest.tmp
        AC_MSG_RESULT([continue configure in default builddir "./$SUB"])
      else
        AC_MSG_ERROR([could not change to default builddir "./$SUB"])
      fi
      srcdir=`echo "$SUB" |
              sed -e 's,^\./,,;s,[[^/]]$,&/,;s,[[^/]]*/,../,g;s,[[/]]$,,;'`
      # going to restart from subdirectory location
      test -f $srcdir/config.log   && mv $srcdir/config.log   .
      test -f $srcdir/confdefs.h   && mv $srcdir/confdefs.h   .
      test -f $srcdir/conftest.log && mv $srcdir/conftest.log .
      test -f $srcdir/$cache_file  && mv $srcdir/$cache_file  .
      AC_MSG_RESULT(....exec $SHELL $srcdir/[$]0 "--srcdir=$srcdir" "--enable-builddir=$SUB" ${1+"[$]@"})
      case "[$]0" in # restart
       [[\\/]]* | ?:[[\\/]]*) # Asbolute name
         eval $SHELL "'[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
       *) eval $SHELL "'$srcdir/[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
      esac ; exit $?
    fi
  fi
 fi fi
 test ".$SUB" = ".auto" && SUB="."
 dnl ac_path_prog uses "set dummy" to override $@ which would defeat the "exec"
 AC_PATH_PROG(SED,gsed sed, sed)
 AUX="$am_aux_dir"
 AS_VAR_POPDEF([SED])dnl
 AS_VAR_POPDEF([AUX])dnl
 AS_VAR_POPDEF([SUB])dnl
 AC_CONFIG_COMMANDS([buildir],[dnl .............. config.status ..............
 AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
 AS_VAR_PUSHDEF([TOP],[top_srcdir])dnl
 AS_VAR_PUSHDEF([SRC],[ac_top_srcdir])dnl
 AS_VAR_PUSHDEF([AUX],[ax_enable_builddir_auxdir])dnl
 AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
 pushdef([END],[Makefile.mk])dnl
 pushdef([_ALL],[ifelse([$3],,[-all],[$3])])dnl
  SRC="$ax_enable_builddir_srcdir"
  if test ".$SUB" = ".." ; then
    if test -f "$TOP/Makefile" ; then
      AC_MSG_NOTICE([skipping TOP/Makefile - left untouched])
    else
      AC_MSG_NOTICE([skipping TOP/Makefile - not created])
    fi
  else
    if test -f "$SRC/Makefile" ; then
      a=`grep "^VERSION " "$SRC/Makefile"` ; b=`grep "^VERSION " Makefile`
      test "$a" != "$b" && rm "$SRC/Makefile"
    fi
    if test -f "$SRC/Makefile" ; then
 	echo "$SRC/Makefile : $SRC/Makefile.in" > $tmp/conftemp.mk
 	echo "	[]@ echo 'REMOVED,,,' >\$[]@" >> $tmp/conftemp.mk
      eval "${MAKE-make} -f $tmp/conftemp.mk 2>/dev/null >/dev/null"
      if grep '^REMOVED,,,' "$SRC/Makefile" >/dev/null
      then rm $SRC/Makefile ; fi
      cp $tmp/conftemp.mk $SRC/makefiles.mk~      ## DEBUGGING
    fi
    if test ! -f "$SRC/Makefile" ; then
      AC_MSG_NOTICE([create TOP/Makefile guessed from local Makefile])
      x='`' ; cat >$tmp/conftemp.sed <<_EOF
 /^\$/n
 x
 /^\$/bS
 x
 /\\\\\$/{H;d;}
 {H;s/.*//;x;}
 bM
 :S
 x
 /\\\\\$/{h;d;}
 {h;s/.*//;x;}
 :M
 s/\\(\\n\\)	/\\1 /g
 /^	/d
 /^[[	 ]]*[[\\#]]/d
 /^VPATH *=/d
 s/^srcdir *=.*/srcdir = ./
 s/^top_srcdir *=.*/top_srcdir = ./
 /[[:=]]/!d
 /^\\./d
 dnl Now handle rules (i.e. lines containing ":" but not " = ").
 / = /b
 / .= /b
 /:/!b
 s/:.*/:/
 s/ /  /g
 s/ \\([[a-z]][[a-z-]]*[[a-zA-Z0-9]]\\)\\([[ :]]\\)/ \\1 \\1[]_ALL\\2/g
 s/^\\([[a-z]][[a-z-]]*[[a-zA-Z0-9]]\\)\\([[ :]]\\)/\\1 \\1[]_ALL\\2/
 s/  / /g
 /^all all[]_ALL[[ :]]/i\\
 all-configured : all[]_ALL
 dnl dist-all exists... and would make for dist-all-all
 s/ [[a-zA-Z0-9-]]*[]_ALL [[a-zA-Z0-9-]]*[]_ALL[]_ALL//g
 /[]_ALL[]_ALL/d
 a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
 	; BUILD=$x grep "^#### \$\$HOST " Makefile | sed -e 's/.*|//' $x \\\\\\
 	; use=$x basename "\$\@" _ALL $x; n=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$n * \$\@"; if test "\$\$n" -eq "0" ; then : \\\\\\
 	; BUILD=$x grep "^####.*|" Makefile |tail -1| sed -e 's/.*|//' $x ; fi \\\\\\
 	; test ".\$\$BUILD" = "." && BUILD="." \\\\\\
 	; test "\$\$use" = "\$\@" && BUILD=$x echo "\$\$BUILD" | tail -1 $x \\\\\\
 	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; (cd "\$\$i" && test ! -f configure && \$(MAKE) \$\$use) || exit; done
 dnl special rule add-on: "dist" copies the tarball to $(PUB). (source tree)
 /dist[]_ALL *:/a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
 	; BUILD=$x grep "^#### \$\$HOST " Makefile | sed -e 's/.*|//' $x \\\\\\
 	; found=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$found \$(PACKAGE)-\$(VERSION).tar.*" \\\\\\
 	; if test "\$\$found" -eq "0" ; then : \\\\\\
 	; BUILD=$x grep "^#### .*|" Makefile |tail -1| sed -e 's/.*|//' $x \\\\\\
 	; fi ; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; for f in \$\$i/\$(PACKAGE)-\$(VERSION).tar.* \\\\\\
 	; do test -f "\$\$f" && mv "\$\$f" \$(PUB). ; done ; break ; done
 dnl special rule add-on: "dist-foo" copies all the archives to $(PUB). (source tree)
 /dist-[[a-zA-Z0-9]]*[]_ALL *:/a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh ./config.guess $x \\\\\\
 	; BUILD=$x grep "^#### \$\$HOST " Makefile | sed -e 's/.*|//' $x \\\\\\
 	; found=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$found \$(PACKAGE)-\$(VERSION).*" \\\\\\
 	; if test "\$\$found" -eq "0" ; then : \\\\\\
 	; BUILD=$x grep "^#### .*|" Makefile |tail -1| sed -e 's/.*|//' $x \\\\\\
 	; fi ; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; for f in \$\$i/\$(PACKAGE)-\$(VERSION).* \\\\\\
 	; do test -f "\$\$f" && mv "\$\$f" \$(PUB). ; done ; break ; done
 dnl special rule add-on: "distclean" removes all local builddirs completely
 /distclean[]_ALL *:/a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
 	; BUILD=$x grep "^#### .*|" Makefile | sed -e 's/.*|//' $x \\\\\\
 	; use=$x basename "\$\@" _ALL $x; n=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$n * \$\@ (all local builds)" \\\\\\
 	; test ".\$\$BUILD" = "." && BUILD="." \\\\\\
 	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; echo "# rm -r \$\$i"; done ; echo "# (sleep 3)" ; sleep 3 \\\\\\
 	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; echo "\$\$i" | grep "^/" > /dev/null && continue \\\\\\
 	; echo "\$\$i" | grep "^../" > /dev/null && continue \\\\\\
 	; echo "rm -r \$\$i"; (rm -r "\$\$i") ; done ; rm Makefile
 _EOF
      cp "$tmp/conftemp.sed" "$SRC/makefile.sed~"            ## DEBUGGING
      $SED -f $tmp/conftemp.sed Makefile >$SRC/Makefile
      if test -f "$SRC/m4_ifval([$2],[$2],[END])" ; then
        AC_MSG_NOTICE([extend TOP/Makefile with TOP/m4_ifval([$2],[$2],[END])])
        cat $SRC/END >>$SRC/Makefile
      fi ; xxxx="####"
      echo "$xxxx CONFIGURATIONS FOR TOPLEVEL MAKEFILE: " >>$SRC/Makefile
      # sanity check
      if grep '^; echo "MAKE ' $SRC/Makefile >/dev/null ; then
        AC_MSG_NOTICE([buggy sed found - it deletes tab in "a" text parts])
        $SED -e '/^@ HOST=/s/^/	/' -e '/^; /s/^/	/' $SRC/Makefile \
          >$SRC/Makefile~
        (test -s $SRC/Makefile~ && mv $SRC/Makefile~ $SRC/Makefile) 2>/dev/null
      fi
    else
      xxxx="\\#\\#\\#\\#"
      # echo "/^$xxxx *$ax_enable_builddir_host /d" >$tmp/conftemp.sed
      echo "s!^$xxxx [[^|]]* | *$SUB *\$!$xxxx ...... $SUB!" >$tmp/conftemp.sed
      $SED -f "$tmp/conftemp.sed" "$SRC/Makefile" >$tmp/mkfile.tmp
        cp "$tmp/conftemp.sed" "$SRC/makefiles.sed~"         ## DEBUGGING
        cp "$tmp/mkfile.tmp"   "$SRC/makefiles.out~"         ## DEBUGGING
      if cmp -s "$SRC/Makefile" "$tmp/mkfile.tmp" 2>/dev/null ; then
        AC_MSG_NOTICE([keeping TOP/Makefile from earlier configure])
        rm "$tmp/mkfile.tmp"
      else
        AC_MSG_NOTICE([reusing TOP/Makefile from earlier configure])
        mv "$tmp/mkfile.tmp" "$SRC/Makefile"
      fi
    fi
    AC_MSG_NOTICE([build in $SUB (HOST=$ax_enable_builddir_host)])
    xxxx="####"
    echo "$xxxx" "$ax_enable_builddir_host" "|$SUB" >>$SRC/Makefile
  fi
 popdef([END])dnl
 AS_VAR_POPDEF([SED])dnl
 AS_VAR_POPDEF([AUX])dnl
 AS_VAR_POPDEF([SRC])dnl
 AS_VAR_POPDEF([TOP])dnl
 AS_VAR_POPDEF([SUB])dnl
 ],[dnl
 ax_enable_builddir_srcdir="$srcdir"                    # $srcdir
 ax_enable_builddir_host="$HOST"                        # $HOST / $host
 ax_enable_builddir_version="$VERSION"                  # $VERSION
 ax_enable_builddir_package="$PACKAGE"                  # $PACKAGE
 ax_enable_builddir_auxdir="$ax_enable_builddir_auxdir" # $AUX
 ax_enable_builddir_sed="$ax_enable_builddir_sed"       # $SED
 ax_enable_builddir="$ax_enable_builddir"               # $SUB
 ])dnl
 ])
--- a/m4/ax_extend_srcdir.m4
+++ b/m4/ax_extend_srcdir.m4
@ -0,0 +1,86 @@
 # ===========================================================================
 #     http://www.gnu.org/software/autoconf-archive/ax_extend_srcdir.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_EXTEND_SRCDIR
 #
 # DESCRIPTION
 #
 #   The AX_EXTEND_SRCDIR macro extends $srcdir by one path component.
 #
 #   As an example, when working in /home/michael/i3-4.12/build and calling
 #   ../configure, your $srcdir is "..". After calling AX_EXTEND_SRCDIR,
 #   $srcdir will be set to "../../i3-4.12".
 #
 #   The result of extending $srcdir is that filenames (e.g. in the output of
 #   the "backtrace" gdb command) will include one more path component of the
 #   absolute source path. The additional path component makes it easy for
 #   users to recognize which files belong to the PACKAGE, and -- provided a
 #   dist tarball was unpacked -- which version of PACKAGE was used.
 #
 #   As an example, in "backtrace", you will see:
 #
 #     #0  main (argc=1, argv=0x7fffffff1fc8) at ../../i3-4.12/src/main.c:187
 #
 #   instead of:
 #
 #     #0  main (argc=1, argv=0x7fffffff1fc8) at ../src/main.c:187
 #
 #   In case your code uses the __FILE__ preprocessor directive to refer to
 #   the filename of the current source file (e.g. in debug messages), using
 #   the extended path might be undesirable. For this purpose,
 #   AX_EXTEND_SRCDIR defines the output variable AX_EXTEND_SRCDIR_CPPFLAGS,
 #   which can be added to AM_CPPFLAGS in Makefile.am in order to define the
 #   preprocessor directive STRIPPED__FILE__. As an example, when compiling
 #   the file "../../i3-4.12/src/main.c", STRIPPED__FILE__ evaluates to
 #   "main.c".
 #
 #   There are some caveats: When $srcdir is "." (i.e. when ./configure was
 #   called instead of ../configure in a separate build directory),
 #   AX_EXTEND_SRCDIR will still extend $srcdir, but the intended effect will
 #   not be achieved because of the way automake specifies file paths:
 #   automake defines COMPILE to use "`test -f '$source' || echo
 #   '\$(srcdir)/'`$source" in order to prefer files in the current directory
 #   over specifying $srcdir explicitly.
 #
 #   The AX_EXTEND_SRCDIR author is not aware of any way to influence this
 #   automake behavior. Patches very welcome.
 #
 #   To work around this issue, you can use AX_ENABLE_BUILDDIR i.e. by adding
 #   the following code to configure.ac:
 #
 #     AX_ENABLE_BUILDDIR
 #     dnl ...
 #     AX_EXTEND_SRCDIR
 #
 #   Then also add this bit to Makefile.am (if you wish to use
 #   STRIPPED__FILE__ in your code):
 #
 #     AM_CPPFLAGS = @AX_EXTEND_SRCDIR_CPPFLAGS@
 #
 # LICENSE
 #
 #   Copyright (c) 2016 Michael Stapelberg <michael@i3wm.org>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved.  This file is offered as-is, without any
 #   warranty.
 #serial 3
 AC_DEFUN([AX_EXTEND_SRCDIR],
 [dnl
 AS_CASE([$srcdir],
  [.|.*|/*],
  [
    # pwd -P is specified in IEEE 1003.1 from 2004
    as_dir=`cd "$srcdir" && pwd -P`
    as_base=`AS_BASENAME([$as_dir])`
    srcdir=${srcdir}/../${as_base}
    AC_SUBST([AX_EXTEND_SRCDIR_CPPFLAGS], ["-DSTRIPPED__FILE__=AS_ESCAPE([\"$$(basename $<)\"])"])
  ])
 ])dnl AX_EXTEND_SRCDIR
--- a/m4/ax_require_defined.m4
+++ b/m4/ax_require_defined.m4
@ -0,0 +1,37 @@
 # ===========================================================================
 #    http://www.gnu.org/software/autoconf-archive/ax_require_defined.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_REQUIRE_DEFINED(MACRO)
 #
 # DESCRIPTION
 #
 #   AX_REQUIRE_DEFINED is a simple helper for making sure other macros have
 #   been defined and thus are available for use.  This avoids random issues
 #   where a macro isn't expanded.  Instead the configure script emits a
 #   non-fatal:
 #
 #     ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found
 #
 #   It's like AC_REQUIRE except it doesn't expand the required macro.
 #
 #   Here's an example:
 #
 #     AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
 #
 # LICENSE
 #
 #   Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 #serial 1
 AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
  m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
 ])dnl AX_REQUIRE_DEFINED
--- a/m4/ax_sanitizers.m4
+++ b/m4/ax_sanitizers.m4
@ -0,0 +1,130 @@
 # ===========================================================================
 #      http://www.gnu.org/software/autoconf-archive/ax_sanitizers.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_SANITIZERS([SANITIZERS], [ENABLED-BY-DEFAULT], [ACTION-SUCCESS])
 #
 # DESCRIPTION
 #
 #   Offers users to enable one or more sanitizers (see
 #   https://github.com/google/sanitizers) with the corresponding
 #   --enable-<sanitizer>-sanitizer option.
 #
 #   SANITIZERS is a whitespace-separated list of sanitizers to offer via
 #   --enable-<sanitizer>-sanitizer options, e.g. "address memory" for the
 #   address sanitizer and the memory sanitizer. If SANITIZERS is not specified,
 #   all known sanitizers to AX_SANITIZERS will be offered, which at the time of
 #   writing are "address memory undefined".
 #   NOTE that SANITIZERS is expanded at autoconf time, not at configure time,
 #   i.e. you cannot use shell variables in SANITIZERS.
 #
 #   ENABLED-BY-DEFAULT is a whitespace-separated list of sanitizers which
 #   should be enabled by default, e.g. "memory undefined". Note that not all
 #   sanitizers can be combined, e.g. memory sanitizer cannot be enabled when
 #   address sanitizer is already enabled.
 #   Set ENABLED-BY-DEFAULT to a single whitespace in order to disable all
 #   sanitizers by default.
 #   ENABLED-BY-DEFAULT is expanded at configure time, so you can use shell
 #   variables.
 #
 #   ACTION-SUCCESS allows to specify shell commands to execute on success, i.e.
 #   when one of the sanitizers was successfully enabled. This is a good place
 #   to call AC_DEFINE for any precompiler constants you might need to make your
 #   code play nice with sanitizers.
 #
 #   The variable ax_enabled_sanitizers contains a whitespace-separated list of
 #   all enabled sanitizers, so that you can print them at the end of configure,
 #   if you wish.
 #
 #   The additional --enable-sanitizers option allows users to enable/disable
 #   all sanitizers, effectively overriding ENABLED-BY-DEFAULT.
 #
 # EXAMPLES
 #
 #   AX_SANITIZERS([address])
 #     dnl offer users to enable address sanitizer via --enable-address-sanitizer
 #
 #   is_debug_build=…
 #   if test "x$is_debug_build" = "xyes"; then
 #     default_sanitizers="address memory"
 #   else
 #     default_sanitizers=
 #   fi
 #   AX_SANITIZERS([address memory], [$default_sanitizers])
 #     dnl enable address sanitizer and memory sanitizer by default for debug
 #     dnl builds, e.g. when building from git instead of a dist tarball.
 #
 #   AX_SANITIZERS(, , [
 #     AC_DEFINE([SANITIZERS_ENABLED],
 #               [],
 #               [At least one sanitizer was enabled])])
 #     dnl enable all sanitizers known to AX_SANITIZERS by default and set the
 #     dnl SANITIZERS_ENABLED precompiler constant.
 #
 #   AX_SANITIZERS(, [ ])
 #     dnl provide all sanitizers, but enable none by default.
 #
 # LICENSE
 #
 #   Copyright (c) 2016 Michael Stapelberg <michael@i3wm.org>
 #
 #   Copying and distribution of this file, with or without modification,
 #   are permitted in any medium without royalty provided the copyright
 #   notice and this notice are preserved.  This file is offered as-is,
 #   without any warranty.
 AC_DEFUN([AX_SANITIZERS],
 [AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
 AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
 AC_ARG_ENABLE(sanitizers,
  AS_HELP_STRING(
    [--enable-sanitizers],
    [enable all known sanitizers]),
  [ax_sanitizers_default=$enableval],
  [ax_sanitizers_default=])
 ax_enabled_sanitizers=
 m4_foreach_w([mysan], m4_default($1, [address memory undefined]), [
  dnl If ax_sanitizers_default is unset, i.e. the user neither explicitly
  dnl enabled nor explicitly disabled all sanitizers, we get the default value
  dnl for this sanitizer based on whether it is listed in ENABLED-BY-DEFAULT.
  AS_IF([test "x$ax_sanitizers_default" = "x"], [dnl
          ax_sanitizer_default=
          for mycheck in m4_default([$2], [address memory undefined]); do
            AS_IF([test "x$mycheck" = "x[]mysan"], [ax_sanitizer_default=yes])
          done
          AS_IF([test "x$ax_sanitizer_default" = "x"], [ax_sanitizer_default=no])
        ],
        [ax_sanitizer_default=$ax_sanitizers_default])
  AC_ARG_ENABLE(mysan[]-sanitizer,
    AS_HELP_STRING(
      [--enable-[]mysan[]-sanitizer],
      [enable -fsanitize=mysan]),
    [ax_sanitizer_enabled=$enableval],
    [ax_sanitizer_enabled=$ax_sanitizer_default])
 AS_IF([test "x$ax_sanitizer_enabled" = "xyes"], [
 dnl Not using AX_APPEND_COMPILE_FLAGS and AX_APPEND_LINK_FLAGS because they
 dnl lack the ability to specify ACTION-SUCCESS.
  AX_CHECK_COMPILE_FLAG([-fsanitize=[]mysan], [
    AX_CHECK_LINK_FLAG([-fsanitize=[]mysan], [
      AX_APPEND_FLAG([-fsanitize=[]mysan], [])
 dnl If and only if libtool is being used, LDFLAGS needs to contain -Wc,-fsanitize=….
 dnl See e.g. https://sources.debian.net/src/systemd/231-7/configure.ac/?hl=128#L135
 dnl TODO: how can recognize that situation and add -Wc,?
      AX_APPEND_FLAG([-fsanitize=[]mysan], [LDFLAGS])
 dnl TODO: add -fPIE -pie for memory
      # -fno-omit-frame-pointer results in nicer stack traces in error
      # messages, see http://clang.llvm.org/docs/AddressSanitizer.html#usage
      AX_CHECK_COMPILE_FLAG([-fno-omit-frame-pointer], [
        AX_APPEND_FLAG([-fno-omit-frame-pointer], [])])
 dnl TODO: at least for clang, we should specify exactly -O1, not -O2 or -O0, so that performance is reasonable but stacktraces are not tampered with (due to inlining), see http://clang.llvm.org/docs/AddressSanitizer.html#usage
      m4_default([$3], :)
      ax_enabled_sanitizers="[]mysan $ax_enabled_sanitizers"
    ])
  ])
 ])
 ])dnl
 ])dnl AX_SANITIZERS
--- a/pam/i3lock
+++ b/pam/i3lock