#
#  This file is part of nzbget. See <http://nzbget.net>.
#
# Copyright (C) 2008-2021 Andrey Prygunkov <hugbug@users.sourceforge.net>
#
# 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 2 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/>.
#

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ(2.65)
AC_INIT(nzbget, 21.2-testing, hugbug@users.sourceforge.net)
AC_CONFIG_AUX_DIR(posix)
AC_CANONICAL_TARGET
AM_INIT_AUTOMAKE([foreign subdir-objects])
AC_CONFIG_SRCDIR([daemon/main/nzbget.cpp])
AC_CONFIG_HEADERS([config.h])
AM_MAINTAINER_MODE

m4_include([posix/ax_cxx_compile_stdcxx.m4])


dnl
dnl Check for programs.
dnl
AC_PROG_CXX
AC_PATH_PROG(TAR, tar, $FALSE)
AC_PATH_PROG(MAKE, make, $FALSE)
AC_PROG_INSTALL


dnl
dnl Do all tests with c++ compiler.
dnl
AC_LANG(C++)

dnl
dnl Determine compiler switches to support C++14 standard.
dnl
AC_MSG_CHECKING(whether to test compiler features)
AC_ARG_ENABLE(cpp-check,
	[AS_HELP_STRING([--disable-cpp-check], [disable check for C++14 compiler features])],
	[ ENABLECPPCHECK=$enableval ],
	[ ENABLECPPCHECK=yes] )
AC_MSG_RESULT($ENABLECPPCHECK)
if test "$ENABLECPPCHECK" = "yes"; then
	AX_CXX_COMPILE_STDCXX(14,,[optional])
	if test "$HAVE_CXX14" != "1"; then
		AC_MSG_ERROR("A compiler with support for C++14 language features is required. For details visit http://nzbget.net/cpp14")
	fi
fi

dnl
dnl Checks for header files.
dnl
AC_CHECK_HEADERS(sys/prctl.h regex.h endian.h getopt.h)


dnl
dnl Check for libs
dnl
AC_SEARCH_LIBS([pthread_create], [pthread])
AC_SEARCH_LIBS([socket], [socket])
AC_SEARCH_LIBS([inet_addr], [nsl])
AC_SEARCH_LIBS([hstrerror], [resolv])


dnl
dnl Android NDK restrictions
dnl
AC_CHECK_FUNC(lockf,
	[AC_CHECK_DECL(lockf,
		[AC_DEFINE([HAVE_LOCKF], 1, [Define to 1 if lockf is supported])],,
		[#include <unistd.h>])])
AC_CHECK_FUNC(pthread_cancel,
	[AC_CHECK_DECL(pthread_cancel,
		[AC_DEFINE([HAVE_PTHREAD_CANCEL], 1, [Define to 1 if pthread_cancel is supported])],,
		[#include <pthread.h>])])


dnl
dnl Getopt
dnl
AC_CHECK_FUNC(getopt_long,
	[AC_DEFINE([HAVE_GETOPT_LONG], 1, [Define to 1 if getopt_long is supported])],)


dnl
dnl fsync
dnl
AC_CHECK_FUNC(fdatasync,
	[AC_DEFINE([HAVE_FDATASYNC], 1, [Define to 1 if fdatasync is supported])],)
AC_CHECK_DECL(F_FULLFSYNC,
	[AC_DEFINE([HAVE_FULLFSYNC], 1, [Define to 1 if F_FULLFSYNC is supported])],,[#include <fcntl.h>])

dnl
dnl use 64-Bits for file sizes
dnl
AC_SYS_LARGEFILE


dnl
dnl check ctime_r
dnl
AC_MSG_CHECKING(for ctime_r)
AC_TRY_COMPILE(
	[#include <time.h>],
	[ time_t clock; char buf[26];	ctime_r(&clock, buf, 26); ],
	AC_MSG_RESULT([[yes, and it takes 3 arguments]])
	FOUND="yes"
	AC_DEFINE([HAVE_CTIME_R_3], 1, [Define to 1 if ctime_r takes 3 arguments]),
	FOUND="no")
if test "$FOUND" = "no"; then
AC_TRY_COMPILE(
	[#include <time.h>],
	[ time_t clock; char buf[26];	ctime_r(&clock, buf); ],
	AC_MSG_RESULT([[yes, and it takes 2 arguments]])
	FOUND="yes"
	AC_DEFINE([HAVE_CTIME_R_2], 1, [Define to 1 if ctime_r takes 2 arguments]),
	FOUND="no")
fi
if test "$FOUND" = "no"; then
	AC_MSG_RESULT([no])
	AC_MSG_ERROR("function ctime_r not found")
fi


dnl
dnl check getaddrinfo
dnl
AC_CHECK_FUNC(getaddrinfo,
	FOUND="yes"
	[AC_DEFINE([HAVE_GETADDRINFO], 1, [Define to 1 if getaddrinfo is supported])]
	AC_SEARCH_LIBS([getaddrinfo], [nsl]),
	FOUND="no")


dnl
dnl check gethostbyname_r, if getaddrinfo is not available
dnl
if test "$FOUND" = "no"; then
	AC_MSG_CHECKING(for gethostbyname_r)
	
	AC_TRY_COMPILE(
		[#include <netdb.h>],
		[	char* szHost; struct hostent hinfobuf; char* strbuf; int h_errnop;
			struct hostent* hinfo = gethostbyname_r(szHost, &hinfobuf, strbuf, 1024, &h_errnop); ],
		AC_MSG_RESULT([[yes, and it takes 5 arguments]])
		FOUND="yes"
		AC_DEFINE([HAVE_GETHOSTBYNAME_R_5], 1, [Define to 1 if gethostbyname_r takes 5 arguments]),
		FOUND="no")
	
	if test "$FOUND" = "no"; then
	AC_TRY_COMPILE(
		[#include <netdb.h>],
		[	char* szHost; struct hostent* hinfo; struct hostent hinfobuf; char* strbuf; int h_errnop;
			int err = gethostbyname_r(szHost, &hinfobuf, strbuf, 1024, &hinfo, &h_errnop); ],
		AC_MSG_RESULT([[yes, and it takes 6 arguments]])
		FOUND="yes"
		AC_DEFINE([HAVE_GETHOSTBYNAME_R_6], 1, [Define to 1 if gethostbyname_r takes 6 arguments]),
		FOUND="no")
	fi
	
	if test "$FOUND" = "no"; then
	AC_TRY_COMPILE(
		[#include <netdb.h>],
		[	char* szHost; struct hostent hinfo; struct hostent_data hinfobuf; 
			int err = gethostbyname_r(szHost, &hinfo, &hinfobuf); ],
		AC_MSG_RESULT([[yes, and it takes 3 arguments]])
		FOUND="yes"
		AC_DEFINE([HAVE_GETHOSTBYNAME_R_3], 1, [Define to 1 if gethostbyname_r takes 3 arguments]),
		AC_MSG_RESULT([[no]])
		FOUND="no")
	fi
	
	if test "$FOUND" = "yes"; then
		AC_DEFINE([HAVE_GETHOSTBYNAME_R], 1, [Define to 1 if gethostbyname_r is supported])
		AC_SEARCH_LIBS([gethostbyname_r], [nsl])
	fi
fi


dnl
dnl Determine what socket length (socklen_t) data type is
dnl
AC_MSG_CHECKING([for type of socket length (socklen_t)])
AC_TRY_COMPILE([
#include <stddef.h>
#include <sys/types.h>
#include <sys/socket.h>],[
(void)getsockopt (1, 1, 1, NULL, (socklen_t*)NULL)],[
  AC_MSG_RESULT(socklen_t)
  SOCKLEN_T=socklen_t],[
  AC_TRY_COMPILE([
#include <stddef.h>
#include <sys/types.h>
#include <sys/socket.h>],[
(void)getsockopt (1, 1, 1, NULL, (size_t*)NULL)],[
	AC_MSG_RESULT(size_t)
	SOCKLEN_T=size_t],[
	AC_TRY_COMPILE([
#include <stddef.h>
#include <sys/types.h>
#include <sys/socket.h>],[
(void)getsockopt (1, 1, 1, NULL, (int*)NULL)],[
	AC_MSG_RESULT(int)
	SOCKLEN_T=int],[
	AC_MSG_WARN(could not determine)
	SOCKLEN_T=int])])])
AC_DEFINE_UNQUOTED(SOCKLEN_T, $SOCKLEN_T, [Determine what socket length (socklen_t) data type is])


dnl
dnl check cpu cores via sysconf
dnl
AC_MSG_CHECKING(for cpu cores via sysconf)
AC_TRY_COMPILE(
	[#include <unistd.h>],
	[ int a = _SC_NPROCESSORS_ONLN; ],
	FOUND="yes"
	AC_MSG_RESULT([[yes]])
	AC_DEFINE([HAVE_SC_NPROCESSORS_ONLN], 1, [Define to 1 if _SC_NPROCESSORS_ONLN is present in unistd.h]),
	FOUND="no")


dnl 
dnl checks for libxml2 includes and libraries.
dnl
AC_MSG_CHECKING(whether to use libxml2)
AC_ARG_ENABLE(libxml2,
	[AS_HELP_STRING([--disable-libxml2], [do not use libxml2 (removes dependency from libxml2-library, only for development purposes)])],
	[USELIBXML2=$enableval],
	[USELIBXML2=yes] )
AC_MSG_RESULT($USELIBXML2)
if test "$USELIBXML2" = "yes"; then
	AC_ARG_WITH(libxml2_includes,
		[AS_HELP_STRING([--with-libxml2-includes=DIR], [libxml2 include directory])],
		[CPPFLAGS="${CPPFLAGS} -I${withval}"]
		[INCVAL="yes"],
		[INCVAL="no"])
	AC_ARG_WITH(libxml2_libraries,
		[AS_HELP_STRING([--with-libxml2-libraries=DIR], [libxml2 library directory])],
		[LDFLAGS="${LDFLAGS} -L${withval}"]
		[LIBVAL="yes"],
		[LIBVAL="no"])
	if test "$INCVAL" = "no" -o "$LIBVAL" = "no"; then
		PKG_CHECK_MODULES(libxml2, libxml-2.0,
			[LIBS="${LIBS} $libxml2_LIBS"]
			[CPPFLAGS="${CPPFLAGS} $libxml2_CFLAGS"],
			AC_MSG_ERROR("libxml2 library not found"))
	fi
	AC_CHECK_HEADER(libxml/tree.h,,
		AC_MSG_ERROR("libxml2 header files not found"))
	AC_SEARCH_LIBS([xmlNewNode], [xml2], ,
		AC_MSG_ERROR("libxml2 library not found"))
else
	AC_DEFINE([DISABLE_LIBXML2],1,[Define to 1 to not use libxml2, only for development purposes])
fi


dnl
dnl Use curses. Deafult: yes
dnl
AC_MSG_CHECKING(whether to use curses)
AC_ARG_ENABLE(curses,
	[AS_HELP_STRING([--disable-curses], [do not use curses (removes dependency from curses-library)])],
	[USECURSES=$enableval],
	[USECURSES=yes] )
AC_MSG_RESULT($USECURSES)
if test "$USECURSES" = "yes"; then
	AC_ARG_WITH(libcurses_includes,
		[AS_HELP_STRING([--with-libcurses-includes=DIR], [libcurses include directory])],
		[CPPFLAGS="${CPPFLAGS} -I${withval}"]
		[INCVAL="yes"],
		[INCVAL="no"])
	AC_ARG_WITH(libcurses_libraries,
		[AS_HELP_STRING([--with-libcurses-libraries=DIR], [libcurses library directory])],
		[LDFLAGS="${LDFLAGS} -L${withval}"]
		[LIBVAL="yes"],
		[LIBVAL="no"])
	if test "$INCVAL" = "no" -o "$LIBVAL" = "no"; then
		PKG_CHECK_MODULES(ncurses, ncurses,
			[LIBS="${LIBS} $ncurses_LIBS"]
			[CPPFLAGS="${CPPFLAGS} $ncurses_CFLAGS"],
			AC_MSG_ERROR("ncurses library not found"))
	fi

	AC_CHECK_HEADER(ncurses.h,
		FOUND=yes
		AC_DEFINE([HAVE_NCURSES_H],1,[Define to 1 if you have the <ncurses.h> header file.]),
		FOUND=no)
	if test "$FOUND" = "no"; then
		AC_CHECK_HEADER(ncurses/ncurses.h,
			FOUND=yes
			AC_DEFINE([HAVE_NCURSES_NCURSES_H],1,[Define to 1 if you have the <ncurses/ncurses.h> header file.]),
			FOUND=no)
	fi
	if test "$FOUND" = "no"; then
		AC_CHECK_HEADER(curses.h,
			FOUND=yes
			AC_DEFINE([HAVE_CURSES_H],1,[Define to 1 if you have the <curses.h> header file.]),
			FOUND=no)
	fi
	if test "$FOUND" = "no"; then
		AC_MSG_ERROR([Couldn't find curses headers (ncurses.h or curses.h)])
	fi
	AC_SEARCH_LIBS([refresh], [ncurses curses],, 
		AC_ERROR([Couldn't find curses library]))
	AC_SEARCH_LIBS([nodelay], [ncurses curses tinfo],, 
		AC_ERROR([Couldn't find curses library]))
else
	AC_DEFINE([DISABLE_CURSES],1,[Define to 1 to not use curses])
fi


dnl
dnl Use par-checking. Deafult: yes.
dnl
AC_MSG_CHECKING(whether to include code for par-checking)
AC_ARG_ENABLE(parcheck,
	[AS_HELP_STRING([--disable-parcheck], [do not include par-check/-repair-support])],
	[ ENABLEPARCHECK=$enableval ],
	[ ENABLEPARCHECK=yes] )
AC_MSG_RESULT($ENABLEPARCHECK)
if test "$ENABLEPARCHECK" = "yes"; then
	dnl PAR2 checks. 
	dnl 
	dnl Checks for typedefs, structures, and compiler characteristics.
	AC_TYPE_SIZE_T
	AC_FUNC_FSEEKO
	dnl Checks for library functions.
	AC_CHECK_FUNCS([stricmp])
	AC_CHECK_FUNCS([getopt])
	AM_CONDITIONAL(WITH_PAR2, true)
else
	AC_DEFINE([DISABLE_PARCHECK],1,[Define to 1 to disable par-verification and repair])
	AM_CONDITIONAL(WITH_PAR2, false)
fi


dnl
dnl Use TLS/SSL. Deafult: yes
dnl
AC_MSG_CHECKING(whether to use TLS/SSL)
AC_ARG_ENABLE(tls,
	[AS_HELP_STRING([--disable-tls], [do not use TLS/SSL (removes dependency from TLS/SSL-libraries)])],
	[ USETLS=$enableval ],
	[ USETLS=yes] )
AC_MSG_RESULT($USETLS)
if test "$USETLS" = "yes"; then
	AC_ARG_WITH(tlslib,
		[AS_HELP_STRING([--with-tlslib=(OpenSSL, GnuTLS)], [TLS/SSL library to use])],
		[TLSLIB="$withval"])
	if test "$TLSLIB" != "GnuTLS" -a "$TLSLIB" != "OpenSSL" -a "$TLSLIB" != ""; then
		AC_MSG_ERROR([Invalid argument for option --with-tlslib])
	fi

	if test "$TLSLIB" = "OpenSSL" -o "$TLSLIB" = ""; then
		AC_ARG_WITH(openssl_includes,
			[AS_HELP_STRING([--with-openssl-includes=DIR], [OpenSSL include directory])],
			[CPPFLAGS="${CPPFLAGS} -I${withval}"]
			[INCVAL="yes"],
			[INCVAL="no"])
		AC_ARG_WITH(openssl_libraries,
			[AS_HELP_STRING([--with-openssl-libraries=DIR], [OpenSSL library directory])],
			[LDFLAGS="${LDFLAGS} -L${withval}"]
			[LIBVAL="yes"],
			[LIBVAL="no"])
		if test "$INCVAL" = "no" -o "$LIBVAL" = "no"; then
			PKG_CHECK_MODULES([openssl], [openssl],
				[LIBS="${LIBS} $openssl_LIBS"]
				[CPPFLAGS="${CPPFLAGS} $openssl_CFLAGS"])
		fi

		AC_CHECK_HEADER(openssl/ssl.h,
			FOUND=yes
			TLSHEADERS=yes,
			FOUND=no)
		if test "$FOUND" = "no" -a "$TLSLIB" = "OpenSSL"; then
			AC_MSG_ERROR([Couldn't find OpenSSL headers (ssl.h)])
		fi
		if test "$FOUND" = "yes"; then
			AC_SEARCH_LIBS([ASN1_OBJECT_free], [crypto],
				AC_SEARCH_LIBS([SSL_CTX_new], [ssl],
					FOUND=yes,
					FOUND=no),
				FOUND=no)
			if test "$FOUND" = "no" -a "$TLSLIB" = "OpenSSL"; then
				AC_MSG_ERROR([Couldn't find OpenSSL library])
			fi
			if test "$FOUND" = "yes"; then
				TLSLIB="OpenSSL"
				AC_DEFINE([HAVE_OPENSSL],1,[Define to 1 to use OpenSSL library for TLS/SSL-support and decryption.])
				AC_SEARCH_LIBS([X509_check_host], [crypto],
					AC_DEFINE([HAVE_X509_CHECK_HOST],1,[Define to 1 if OpenSSL supports function "X509_check_host".]))
			fi
		fi
	fi

	if test "$TLSLIB" = "GnuTLS" -o "$TLSLIB" = ""; then
		AC_ARG_WITH(libgnutls_includes,
			[AS_HELP_STRING([--with-libgnutls-includes=DIR], [GnuTLS include directory])],
			[CPPFLAGS="${CPPFLAGS} -I${withval}"]
			[INCVAL="yes"],
			[INCVAL="no"])
		AC_ARG_WITH(libgnutls_libraries,
			[AS_HELP_STRING([--with-libgnutls-libraries=DIR], [GnuTLS library directory])],
			[LDFLAGS="${LDFLAGS} -L${withval}"]
			[LIBVAL="yes"],
			[LIBVAL="no"])
		if test "$INCVAL" = "no" -o "$LIBVAL" = "no"; then
			PKG_CHECK_MODULES([gnutls], [gnutls],
				[LIBS="${LIBS} $gnutls_LIBS"]
				[CPPFLAGS="${CPPFLAGS} $gnutls_CFLAGS"])
		fi

		AC_CHECK_HEADER(gnutls/gnutls.h,
			FOUND=yes
			TLSHEADERS=yes,
			FOUND=no)
		if test "$FOUND" = "no" -a "$TLSLIB" = "GnuTLS"; then
			AC_MSG_ERROR([Couldn't find GnuTLS headers (gnutls.h)])
		fi
		if test "$FOUND" = "yes"; then
			AC_SEARCH_LIBS([gnutls_global_init], [gnutls],
				FOUND=yes,
				FOUND=no)
			if test "$FOUND" = "yes"; then
				dnl gcrypt is optional
				AC_MSG_CHECKING([whether gcrypt is needed])
				AC_TRY_COMPILE(
					[#include <gnutls/gnutls.h>]
					[#if GNUTLS_VERSION_NUMBER <= 0x020b00]
					[compile error]
					[#endif],
					[int a;],
					AC_MSG_RESULT([no])
					GCRYPT=no,
					AC_MSG_RESULT([yes])
					GCRYPT=yes)
				if test "$GCRYPT" = "yes"; then
					AC_CHECK_HEADER([gcrypt.h],
						AC_SEARCH_LIBS([gcry_control], [gnutls gcrypt],
							FOUND=yes,
							FOUND=no),
						FOUND=yes)
				fi
			fi
			if test "$FOUND" = "no" -a "$TLSLIB" = "GnuTLS"; then
				AC_MSG_ERROR([Couldn't find GnuTLS library])
			fi
			if test "$FOUND" = "yes"; then
				TLSLIB="GnuTLS"
				AC_DEFINE([HAVE_LIBGNUTLS],1,[Define to 1 to use GnuTLS library for TLS/SSL-support.])
			fi
		fi

		if test "$TLSLIB" = "GnuTLS"; then
			AC_ARG_WITH(libnettle_includes,
				[AS_HELP_STRING([--with-libnettle-includes=DIR], [Nettle include directory])],
				[CPPFLAGS="${CPPFLAGS} -I${withval}"]
				[INCVAL="yes"],
				[INCVAL="no"])
			AC_ARG_WITH(libnettle_libraries,
				[AS_HELP_STRING([--with-libnettle-libraries=DIR], [Nettle library directory])],
				[LDFLAGS="${LDFLAGS} -L${withval}"]
				[LIBVAL="yes"],
				[LIBVAL="no"])
			if test "$INCVAL" = "no" -o "$LIBVAL" = "no"; then
				PKG_CHECK_MODULES([nettle], [nettle],
					[LIBS="${LIBS} $nettle_LIBS"]
					[CPPFLAGS="${CPPFLAGS} $nettle_CFLAGS"])
			fi
			AC_CHECK_HEADER(nettle/sha.h,
				FOUND=yes,
				FOUND=no)
			if test "$FOUND" = "no"; then
				AC_MSG_ERROR([Couldn't find Nettle headers (sha.h)])
			fi
			AC_SEARCH_LIBS([nettle_pbkdf2_hmac_sha256], [nettle],
				FOUND=yes,
				FOUND=no)
			if test "$FOUND" = "no"; then
				AC_MSG_ERROR([Couldn't find Nettle library, required when using GnuTLS])
			fi
			if test "$FOUND" = "yes"; then
				AC_DEFINE([HAVE_NETTLE],1,[Define to 1 to use Nettle library for decryption.])
			fi
		fi
	fi

	if test "$TLSLIB" = ""; then
		if test "$TLSHEADERS" = ""; then
			AC_MSG_ERROR([Couldn't find neither OpenSSL nor GnuTLS headers (ssl.h or gnutls.h)])
		else
			AC_MSG_ERROR([Couldn't find neither OpenSSL nor GnuTLS library])
		fi
	fi
else
	AC_DEFINE([DISABLE_TLS],1,[Define to 1 to not use TLS/SSL])
fi


dnl 
dnl checks for zlib includes and libraries.
dnl
AC_MSG_CHECKING(whether to use gzip)
AC_ARG_ENABLE(gzip,
	[AS_HELP_STRING([--disable-gzip], [disable gzip-compression/decompression (removes dependency from zlib-library)])],
	[USEZLIB=$enableval],
	[USEZLIB=yes] )
AC_MSG_RESULT($USEZLIB)
if test "$USEZLIB" = "yes"; then
	AC_ARG_WITH(zlib_includes,
		[AS_HELP_STRING([--with-zlib-includes=DIR], [zlib include directory])],
		[CPPFLAGS="${CPPFLAGS} -I${withval}"]
		[INCVAL="yes"],
		[INCVAL="no"])
	AC_ARG_WITH(zlib_libraries,
		[AS_HELP_STRING([--with-zlib-libraries=DIR], [zlib library directory])],
		[LDFLAGS="${LDFLAGS} -L${withval}"]
		[LIBVAL="yes"],
		[LIBVAL="no"])
	if test "$INCVAL" = "no" -o "$LIBVAL" = "no"; then
		PKG_CHECK_MODULES([zlib], [zlib],
			[LIBS="${LIBS} $zlib_LIBS"]
			[CPPFLAGS="${CPPFLAGS} $zlib_CFLAGS"])
	fi
	
	AC_CHECK_HEADER(zlib.h,,
		AC_MSG_ERROR("zlib header files not found"))
	AC_SEARCH_LIBS([deflateBound], [z], ,
		AC_MSG_ERROR("zlib library not found"))
else
	AC_DEFINE([DISABLE_GZIP],1,[Define to 1 to disable gzip-support])
fi


dnl
dnl Determine if CPU supports SIMD instructions
dnl
AC_MSG_CHECKING(whether to use SIMD-optimized routines)
USE_SIMD=no
case $host_cpu in
	i?86|x86_64)
		SSE2_CXXFLAGS="-msse2"
		SSSE3_CXXFLAGS="-mssse3"
		PCLMUL_CXXFLAGS="-msse4.1 -mpclmul"
		USE_SIMD=yes
		;;
	arm*)
		NEON_CXXFLAGS="-mfpu=neon"
		ACLECRC_CXXFLAGS="-march=armv8-a+crc -fpermissive"
		USE_SIMD=yes
		;;
	aarch64)
		ACLECRC_CXXFLAGS="-march=armv8-a+crc -fpermissive"
		USE_SIMD=yes
		;;
esac
AC_MSG_RESULT($USE_SIMD)
AC_SUBST([SSE2_CXXFLAGS])
AC_SUBST([SSSE3_CXXFLAGS])
AC_SUBST([PCLMUL_CXXFLAGS])
AC_SUBST([NEON_CXXFLAGS])
AC_SUBST([ACLECRC_CXXFLAGS])


dnl 
dnl Some Linux systems require an empty signal handler for SIGCHLD
dnl in order for exit codes to be correctly delivered to parent process.
dnl Some 32-Bit BSD systems however may not function properly if the handler is installed.
dnl The default behavior is to install the handler.
dnl
AC_MSG_CHECKING(whether to use an empty SIGCHLD handler)
AC_ARG_ENABLE(sigchld-handler,
	[AS_HELP_STRING([--disable-sigchld-handler], [do not use sigchld-handler (the disabling may be neccessary on 32-Bit BSD)])],
	[SIGCHLDHANDLER=$enableval],
	[SIGCHLDHANDLER=yes])
AC_MSG_RESULT($SIGCHLDHANDLER)
if test "$SIGCHLDHANDLER" = "yes"; then
	AC_DEFINE([SIGCHLD_HANDLER], 1, [Define to 1 to install an empty signal handler for SIGCHLD])
fi


dnl 
dnl Debugging. Default: no
dnl 
AC_MSG_CHECKING(whether to include all debugging code)
AC_ARG_ENABLE(debug,
	[AS_HELP_STRING([--enable-debug], [enable debugging])],
	[ ENABLEDEBUG=$enableval ],
	[ ENABLEDEBUG=no] )
AC_MSG_RESULT($ENABLEDEBUG)


if test "$ENABLEDEBUG" = "yes"; then

dnl
dnl Begin of debugging code
dnl

AC_DEFINE([DEBUG],1,Define to 1 to include debug-code)


dnl
dnl check for __FUNCTION__ or __func__ macro
dnl
AC_MSG_CHECKING(for macro returning current function name)
AC_TRY_COMPILE(
	[#include <stdio.h>], [printf("%s\n", __FUNCTION__);],
	AC_MSG_RESULT(__FUNCTION__)
	FUNCTION_MACRO_NAME=__FUNCTION__,
AC_TRY_COMPILE([#include <stdio.h>], [printf("%s\n", __func__);],
	AC_MSG_RESULT(__func__)
	FUNCTION_MACRO_NAME=__func__,
	AC_MSG_RESULT(none)))
if test "$FUNCTION_MACRO_NAME" != ""; then
	AC_DEFINE_UNQUOTED(FUNCTION_MACRO_NAME, $FUNCTION_MACRO_NAME, [Define to the name of macro which returns the name of function being compiled])
fi


dnl 
dnl variadic macros
dnl 
AC_MSG_CHECKING(for variadic macros)
AC_TRY_COMPILE(
	[ #define macro(...)   macrofunc(__VA_ARGS__) ]
	[ int macrofunc(int a, int b) { return a + b; } ],
	[ int a=macro(1, 2); ],
	AC_MSG_RESULT([yes])
	AC_DEFINE([HAVE_VARIADIC_MACROS], 1, Define to 1 if variadic macros are supported),
	AC_MSG_RESULT([no]))


dnl
dnl Backtracing on segmentation faults
dnl
AC_MSG_CHECKING(for backtrace)
AC_TRY_COMPILE(
	[#include <execinfo.h>]
	[#include <stdio.h>]
	[#include <stdlib.h>],
	[ void *array[100];	size_t size; char **strings; ]
	[ size = backtrace(array, 100); ]
	[ strings = backtrace_symbols(array, size); ],
	FOUND=yes
	AC_MSG_RESULT([[yes]])
	AC_DEFINE([HAVE_BACKTRACE], 1, [Define to 1 to create stacktrace on segmentation faults]),
	FOUND=no
	AC_MSG_RESULT([[no]]))


dnl
dnl "rdynamic" linker flag
dnl
AC_MSG_CHECKING(for rdynamic linker flag)
	old_LDFLAGS="$LDFLAGS"
	LDFLAGS="$LDFLAGS -rdynamic"
	AC_TRY_LINK([], [],
		AC_MSG_RESULT([[yes]]),
		AC_MSG_RESULT([[no]])
		[LDFLAGS="$old_LDFLAGS"])
		
dnl
dnl End of debugging code
dnl
else
AC_DEFINE([NDEBUG],1,Define to 1 to exclude debug-code)
fi


dnl
dnl Enable test suite. Deafult: no.
dnl
AC_MSG_CHECKING(whether to enable unit and integration tests)
AC_ARG_ENABLE(tests,
	[AS_HELP_STRING([--enable-tests], [enable unit and integration tests])],
	[ ENABLETESTS=$enableval ],
	[ ENABLETESTS=no] )
AC_MSG_RESULT($ENABLETESTS)
if test "$ENABLETESTS" = "yes"; then
	AC_DEFINE([ENABLE_TESTS],1,[Define to 1 to enable unit and integration tests])
	AM_CONDITIONAL(WITH_TESTS, true)
else
	AM_CONDITIONAL(WITH_TESTS, false)
fi

AC_CONFIG_FILES([Makefile])
AC_OUTPUT