construct/configure.ac

dnl TODO: clean up all the OpenSSL and shared module checking stuff;
dnl the most major changes have already been made and it looks like
dnl said functions need to be just about as complex as they already are.

AC_PREREQ(2.63)
AUTOMAKE_OPTIONS = 1.11

AC_INIT([charybdis], [5-dev])
AC_GNU_SOURCE
AC_USE_SYSTEM_EXTENSIONS
AC_CONFIG_MACRO_DIR([m4])
AC_PREFIX_DEFAULT($HOME/ircd)

AC_PATH_PROG(AUTOMAKE, automake)
AC_PATH_PROG(ACLOCAL, aclocal)
AC_PATH_PROG(AUTOHEADER, autoheader)
AC_PATH_PROG(AS, as)
AC_PATH_PROG(RM, rm)
AC_PATH_PROG(CP, cp)
AC_PATH_PROG(MV, mv)
AC_PATH_PROG(LN, ln)
AC_PATH_PROG(TOUCH, touch)

LT_INIT([dlopen shared disable-static])
LT_LANG([C++])

AC_PROG_LIBTOOL
AC_PROG_MAKE_SET
AC_PROG_CC
AC_PROG_CC_C_O
AC_PROG_CXX
AC_PROG_CXX_C_O
AC_LANG(C++)
AC_CONFIG_HEADER(include/ircd/config.h)
AX_CXX_COMPILE_STDCXX([17], [gnu], [mandatory], 201411)


dnl ***************************************************************************
dnl Makefile tree
dnl These (and Makefile.in) are generated from a Makefile.am in the same dir.
dnl

AC_CONFIG_FILES(\
	Makefile                \
	include/ircd/Makefile   \
	charybdis/Makefile      \
	ircd/Makefile           \
	doc/Makefile            \
	modules/Makefile        \
	tools/Makefile          \
)

AM_INIT_AUTOMAKE([subdir-objects])


dnl
dnl Initialization of variables exported to Makefile.am.
dnl These will be further composed throughout this file...
dnl

AC_SUBST(CC)
AC_SUBST(CXX)
AC_SUBST(CFLAGS)
AC_SUBST(CXXFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(LDFLAGS)
AC_SUBST(LIBS)


dnl
dnl Recursive local targets (clean-local is implied)
dnl

#AM_EXTRA_RECURSIVE_TARGETS([
#	mrproper
#])


dnl
dnl Coarse compiler test macros
dnl

AM_CONDITIONAL([GCC],        [[[[ $CXX = g\+\+* ]]]])
AM_CONDITIONAL([CLANG],      [[[[ $CXX = clang* ]]]])


dnl
dnl Coarse operating system test macros
dnl

AM_CONDITIONAL([LINUX],      [[[[ $host_os = *linux* ]]]])
AM_CONDITIONAL([NETBSD],     [[[[ $host_os = *netbsd* ]]]])
AM_CONDITIONAL([FREEBSD],    [[[[ $host_os = *freebsd* ]]]])
AM_CONDITIONAL([MINGW],      [[[[ $host_os = *mingw* ]] || [[ $host_os = *msys* ]]]])
AM_CONDITIONAL([CYGWIN],     [[[[ $host_os = *cygwin* ]]]])
AM_CONDITIONAL([INTERIX],    [[[[ $host_os = *interix* ]]]])
AM_CONDITIONAL([SOLARIS],    [[[[ $host_os = *solaris* ]]]])



dnl ***************************************************************************
dnl Preprocessor define macros
dnl
dnl Use RB_DEFINE() et al to generate defines in config.h
dnl Use CPPDEFINE() to generate defines on the command line if required
dnl

AC_DEFUN([RB_DEFINE],
[
	AC_DEFINE([RB_$1], [$2], [$3])
])

AC_DEFUN([RB_DEFINE_UNQUOTED],
[
	AC_DEFINE_UNQUOTED([RB_$1], [$2], [$3])
])

AC_DEFUN([IRCD_DEFINE],
[
	AC_DEFINE([IRCD_$1], [$2], [$3])
])

AC_DEFUN([IRCD_DEFINE_UNQUOTED],
[
	AC_DEFINE_UNQUOTED([IRCD_$1], [$2], [$3])
])

AC_DEFUN([CPPDEFINE],
[
	if [[ -z "$2" ]]; then
		CPPFLAGS="-D$1 $CPPFLAGS"
	else
		CPPFLAGS="-D$1=$2 $CPPFLAGS"
	fi
])



dnl ***************************************************************************
dnl Developer options
dnl


dnl
dnl Debugging mode
dnl

AC_MSG_CHECKING(if you want to enable debugging)
AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug], [Enable debugging suite for development.]),
[
	AC_SUBST(DEBUG, 1)
	RB_DEFINE_UNQUOTED([DEBUG], [1], [Not configured for release when lit.])
	RB_DEFINE_UNQUOTED([DEBUG_LEVEL], [1], [Defined to 0 for release; or > 0 otherwise])
], [
	AC_SUBST(DEBUG, 0)
	CPPDEFINE([NDEBUG])
	RB_DEFINE_UNQUOTED([DEBUG_LEVEL], [0], [Defined to 0 for release])
])

AM_CONDITIONAL([DEBUG], [[[[ "$DEBUG" = "1" ]]]])


dnl
dnl Profiling mode
dnl

AC_MSG_CHECKING(if you want to do a profile build)
AC_ARG_ENABLE(profile, AC_HELP_STRING([--enable-profile], [Enable profiling]),
[
	if test "$ac_cv_c_compiler_gnu" = yes; then
		AC_MSG_RESULT([yes, adding -pg])
		CXXFLAGS+=" -pg"
		AC_DEFINE(CHARYBDIS_PROFILE, 1, [Define this if you are profiling.])
	else
		AC_MSG_RESULT([no, profile builds only work with gcc])
	fi
], [
])


dnl
dnl Precompiled headers
dnl

AC_MSG_CHECKING(if you want to disable precompiled headers)
AC_ARG_ENABLE(pch, AC_HELP_STRING([--disable-pch], [Disable precompiled header generation]),
[
	build_pch="no"
	AC_MSG_RESULT([no])
], [
	build_pch="yes"
	CPPDEFINE([PCH])
	AC_MSG_RESULT([yes])
])

AM_CONDITIONAL([BUILD_PCH], [[[[ "$build_pch" = "yes" ]]]])


dnl
dnl Compiler intrumentation
dnl

dnl CXXFLAGS+=" -mmpx"
dnl CXXFLAGS+=" -fcheck-pointer-bounds"
CXXFLAGS+=" -fchkp-instrument-marked-only"
CXXFLAGS+=" -fstack-protector-explicit"


dnl
dnl Compiler warnings
dnl

STACK_USAGE_WARNING=16384
FRAME_SIZE_WARNING=8192
CWARNS=""
AC_MSG_CHECKING(if you want to disable warnings)
AC_ARG_ENABLE(warnings,
AC_HELP_STRING([--disable-warnings],[Disable all sorts of warnings like a rockstar]),
[],
[

CHARYBDIS_C_GCC_TRY_FLAGS([-Wall], charybdis_cv_c_gcc_w_all)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wextra], charybdis_cv_c_gcc_w_extra)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wpointer-arith], charybdis_cv_c_gcc_w_pointer_arith)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wcast-align], charybdis_cv_c_gcc_w_cast_align)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wcast-qual], charybdis_cv_c_gcc_w_cast_qual)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wfloat-equal], charybdis_cv_c_gcc_w_float_equal)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wwrite-strings], charybdis_cv_c_gcc_w_write_strings)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wparentheses], charybdis_cv_c_gcc_parentheses)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wmissing-noreturn], charybdis_cv_c_gcc_w_missing_noreturn)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wundef], charybdis_cv_c_gcc_w_undef)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wpacked], charybdis_cv_c_gcc_w_packed)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wformat -Wformat-y2k -Wformat-nonliteral], charybdis_cv_c_gcc_w_format)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wstrict-aliasing=2 -Wstrict-overflow=5], charybdis_cv_c_gcc_w_strict)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wdisabled-optimization], charybdis_cv_c_gcc_w_disabled_optimization)
CHARYBDIS_C_GCC_TRY_FLAGS([-Winvalid-pch], charybdis_cv_c_gcc_w_invalid_pch)
CHARYBDIS_C_GCC_TRY_FLAGS([-Winit-self], charybdis_cv_c_gcc_w_init_self)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wuninitialized], charybdis_cv_c_gcc_w_uninitialized)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wunreachable-code], charybdis_cv_c_gcc_w_unreachable_code)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-overloaded-virtual], charybdis_cv_c_gcc_w_overloaded_virtual)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wnon-virtual-dtor], charybdis_cv_c_gcc_w_non_virtual_dtor)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wnoexcept], charybdis_cv_c_gcc_w_noexcept)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wchkp], charybdis_cv_c_gcc_w_chkp)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wsized-deallocation], charybdis_cv_c_gcc_w_sized_deallocation)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wctor-dtor-privacy], charybdis_cv_c_gcc_w_ctor_dtor_privacy)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wsign-promo], charybdis_cv_c_gcc_w_sign_promo)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-final-types], charybdis_cv_c_gcc_w_suggest_final_types)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-final-methods], charybdis_cv_c_gcc_w_suggest_final_methods)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-override], charybdis_cv_c_gcc_w_suggest_override)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wtrampolines], charybdis_cv_c_gcc_w_trampolines)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wduplicate-cond], charybdis_cv_c_gcc_w_duplicate_cond)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wduplicate-branches], charybdis_cv_c_gcc_w_duplicate_branches)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wrestrict], charybdis_cv_c_gcc_w_restrict)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wnull-dereference], charybdis_cv_c_gcc_w_null_dereference)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wplacement-new=2], charybdis_cv_c_gcc_w_placement_new)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wundef], charybdis_cv_c_gcc_w_undef)

dnl
dnl List of warnings we suppress:
dnl

dnl Missing field initializers should have default init or some zero-extension as per std, this
dnl warning is only useful if you want to gauge where that's happening for a specific reason
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-missing-field-initializers], charybdis_cv_c_gcc_w_missing_field_initializers)

dnl Unused variables, functions, labels, etc are just fine as long as they get optimized
dnl away. These warnings can be re-enabled during a code cleanup, otherwise shut up.
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unused], charybdis_cv_c_gcc_w_unused)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unused-function], charybdis_cv_c_gcc_w_unused_function)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unused-label], charybdis_cv_c_gcc_w_unused_label)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unused-value], charybdis_cv_c_gcc_w_unused_value)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unused-variable], charybdis_cv_c_gcc_w_unused_variable)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unused-parameter], charybdis_cv_c_gcc_w_unused_parameter)

dnl This warns when the compiler sees a statement that 'throws into a noexcept' which
dnl which will certainly terminate the program; it wants us to use std::terminate()
dnl rather than the rethrow. Unless throwing into a noexcept that way has UB in an
dnl optimized build I really don't care and just want to type `throw;` thx.
CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-terminate], charybdis_cv_c_gcc_w_terminate)

dnl
dnl List of compiler-specific / incompatible warning options
dnl

AM_COND_IF([GCC],
[
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wlogical-op], charybdis_cv_c_gcc_w_logical_op)
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wformat-security], charybdis_cv_c_gcc_w_format_security)
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-attribute=format], charybdis_cv_c_gcc_w_suggest_attribute_format)
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wstack-usage=$STACK_USAGE_WARNING], charybdis_cv_c_gcc_w_stack_usage)
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wframe-larger-than=$FRAME_SIZE_WARNING], charybdis_cv_c_gcc_w_frame_larger_than)
],[])

AM_COND_IF([CLANG],
[
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-mismatched-tags], charybdis_cv_c_gcc_w_mismatched_tags)
	CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-format-security], charybdis_cv_c_gcc_w_format_security)
],[])

])

CPPFLAGS+="$CWARNS"


dnl
dnl Misc
dnl

AM_COND_IF([DEBUG],
[
	CXXFLAGS+=" -O0 -ggdb"
], [
	CXXFLAGS+=" -O3"
	CXXFLAGS+=" -fweb"
	CXXFLAGS+=" -fdata-sections"
	CXXFLAGS+=" -ffunction-sections"
	CXXFLAGS+=" -ftree-vectorize"
	CXXFLAGS+=" -fgcse-sm"
	CXXFLAGS+=" -fgcse-las"
	CXXFLAGS+=" -fgcse-after-reload"
	CXXFLAGS+=" -fsched-stalled-insns=0"
	CXXFLAGS+=" -frename-registers"
])

dnl  -ffriend-injection allows us to deduplicate declarations of friend
dnl  functions in both the friend class and the enclosing namespace
CXXFLAGS+=" -ffriend-injection"

dnl  -fvisibility-inlines-hidden - for optimization; note the address of inline
dnl  functions won't be the same between translation units
CXXFLAGS+=" -fvisibility-inlines-hidden"



dnl ***************************************************************************
dnl Philology checks
dnl

AC_ISC_POSIX
AC_C_CONST
AC_C_INLINE
if test "$ac_cv_header_machine_endian_h" = "no" ; then
    AC_C_BIGENDIAN
fi

AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_TYPE_UID_T
AC_TYPE_PID_T

AC_CHECK_TYPES([intptr_t])
AC_CHECK_TYPES([uintptr_t])
AC_CHECK_TYPES([__int128])

AC_CHECK_SIZEOF(char)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(__int128)


dnl -fsigned-char ensures 'char' is signed on all platforms
CXXFLAGS+=" -fsigned-char"


dnl
dnl Header files
dnl

AC_DEFUN([RB_CHK_SYSHEADER],
[
	AC_CHECK_HEADER([$1],
	[
		AC_DEFINE([HAVE_$2], [1], [ Indication $1 is available. ])
		RB_DEFINE_UNQUOTED([INC_$2], [$1>], [ The computed-include location of $1. ])
	], [
		RB_DEFINE_UNQUOTED([INC_$2], [stddef.h>], [ The dead-header in place of $1. ])
	])
])

AC_HEADER_STDBOOL
dnl AC_HEADER_STDC

dnl libc
RB_CHK_SYSHEADER(assert.h, [ASSERT_H])
RB_CHK_SYSHEADER(stdarg.h, [STDARG_H])

dnl libc++
RB_CHK_SYSHEADER(cstddef, [CSTDDEF])
RB_CHK_SYSHEADER(cstdint, [CSTDINT])
RB_CHK_SYSHEADER(limits, [LIMITS])
RB_CHK_SYSHEADER(type_traits, [TYPE_TRAITS])
RB_CHK_SYSHEADER(typeindex, [TYPEINDEX])
RB_CHK_SYSHEADER(variant, [VARIANT])
RB_CHK_SYSHEADER(utility, [UTILITY])
RB_CHK_SYSHEADER(functional, [FUNCTIONAL])
RB_CHK_SYSHEADER(algorithm, [ALGORITHM])
RB_CHK_SYSHEADER(numeric, [NUMERIC])
RB_CHK_SYSHEADER(cmath, [CMATH])
RB_CHK_SYSHEADER(memory, [MEMORY])
RB_CHK_SYSHEADER(exception, [EXCEPTION])
RB_CHK_SYSHEADER(cerrno, [CERRNO])
RB_CHK_SYSHEADER(system_error, [SYSTEM_ERROR])
RB_CHK_SYSHEADER(map, [MAP])
RB_CHK_SYSHEADER(set, [SET])
RB_CHK_SYSHEADER(list, [LIST])
RB_CHK_SYSHEADER(stack, [STACK])
RB_CHK_SYSHEADER(queue, [QUEUE])
RB_CHK_SYSHEADER(deque, [DEQUE])
RB_CHK_SYSHEADER(array, [ARRAY])
RB_CHK_SYSHEADER(vector, [VECTOR])
RB_CHK_SYSHEADER(forward_list, [FORWARD_LIST])
RB_CHK_SYSHEADER(unordered_map, [UNORDERED_MAP])
RB_CHK_SYSHEADER(string, [STRING])
RB_CHK_SYSHEADER(cstring, [CSTRING])
RB_CHK_SYSHEADER(locale, [LOCALE])
RB_CHK_SYSHEADER(codecvt, [CODECVT])
RB_CHK_SYSHEADER(sstream, [SSTREAM])
RB_CHK_SYSHEADER(fstream, [FSTREAM])
RB_CHK_SYSHEADER(iostream, [IOSTREAM])
RB_CHK_SYSHEADER(iomanip, [IOMANIP])
RB_CHK_SYSHEADER(cstdio, [CSTDIO])
RB_CHK_SYSHEADER(chrono, [CHRONO])
RB_CHK_SYSHEADER(ctime, [CTIME])
RB_CHK_SYSHEADER(atomic, [ATOMIC])
RB_CHK_SYSHEADER(thread, [THREAD])
RB_CHK_SYSHEADER(mutex, [MUTEX])
RB_CHK_SYSHEADER(shared_mutex, [SHARED_MUTEX])
RB_CHK_SYSHEADER(condition_variable, [CONDITION_VARIABLE])
RB_CHK_SYSHEADER(random, [RANDOM])
RB_CHK_SYSHEADER(bitset, [BITSET])
RB_CHK_SYSHEADER(string_view, [STRING_VIEW])
RB_CHK_SYSHEADER(optional, [OPTIONAL])

dnl unix platform
RB_CHK_SYSHEADER(unistd.h, [UNISTD_H])
RB_CHK_SYSHEADER(sys/time.h, [SYS_TIME_H])
RB_CHK_SYSHEADER(sys/resource.h, [SYS_RESOURCE_H])
RB_CHK_SYSHEADER(sys/syscall.h, [SYS_SYSCALL_H])

dnl linux platform
RB_CHK_SYSHEADER(sys/eventfd.h, [SYS_EVENTFD_H])
RB_CHK_SYSHEADER(linux/aio_abi.h, [LINUX_AIO_ABI_H])

dnl windows platform
RB_CHK_SYSHEADER(windows.h, [WINDOWS_H])
RB_CHK_SYSHEADER(winsock2.h, [WINSOCK2_H])
RB_CHK_SYSHEADER(ws2tcpip.h, [WS2TCPIP_H])
RB_CHK_SYSHEADER(iphlpapi.h, [IPHLPAPI_H])

dnl experimental
RB_CHK_SYSHEADER(experimental/string_view, [EXPERIMENTAL_STRING_VIEW])
RB_CHK_SYSHEADER(experimental/optional, [EXPERIMENTAL_OPTIONAL])


dnl
dnl Specific function checks
dnl

AC_CHECK_FUNCS([        \
	strlcpy             \
	strlcat             \
	strnlen             \
	snprintf            \
	vsnprintf
])

AC_SEARCH_LIBS(dlinfo, dl, AC_DEFINE(HAVE_DLINFO, 1, [Define if you have dlinfo]))
AC_SEARCH_LIBS(nanosleep, rt posix4, AC_DEFINE(HAVE_NANOSLEEP, 1, [Define if you have nanosleep]))


dnl
dnl Networking Functions
dnl

AC_ARG_ENABLE(ipv6, AC_HELP_STRING([--disable-ipv6], [Disable IPv6 support]),
[
	ipv6=$enableval
], [
	ipv6=yes
])

dnl TODO: IPV6 CHECKS

if test x$ipv6 = "Xyes"; then
	AC_DEFINE([HAVE_IPV6], [1], [IPv6 is supported])
else
	AC_DEFINE([HAVE_IPV6], [0], [IPv6 not supported])
fi


dnl ***************************************************************************
dnl TODO: sort this OS-specific section
dnl

AM_COND_IF(MINGW,
[
	AC_DEFINE(HAVE_WIN32, [1], [Define to 1 if you are on windows])
	LIBS="$LIBS -lws2_32 -liphlpapi"
],[])


AM_COND_IF(INTERIX,
[
	CPPDEFINE([_ALL_SOURCE])
	CPPDEFINE([_XOPEN_SOURCE], [500])
	CPPDEFINE([_POSIX_PTHREAD_SEMANTICS])
	CPPDEFINE([_XPG4_2])
],[])


AM_COND_IF(LINUX,
[
	AC_ARG_ENABLE(aio,
	AC_HELP_STRING([--enable-aio], [Enable AIO support on Linux platforms]),
	[
		IRCD_DEFINE(USE_AIO, [1], [Define to 1 if you want AIO support on linux])
		LIBS="$LIBS -rt"
	],[])
],[])


dnl ***************************************************************************
dnl Installation Layout
dnl

PKG_PROG_PKG_CONFIG

if test "$prefix" = "NONE"; then
	AC_DEFINE_UNQUOTED(RB_PREFIX, "$ac_default_prefix", [Prefix where librb is installed.])
else
	dnl Don't get bitten by Cygwin's stupidity if the user specified
	dnl a custom prefix with a trailing slash
	prefix=`echo $prefix | sed 's/\/$//'`
	AC_DEFINE_UNQUOTED(RB_PREFIX, "$prefix", [Prefix where librb is installed.])
	AC_SUBST(RB_PREFIX)
fi


if test "$prefix" = "NONE"; then
	AC_DEFINE_UNQUOTED(IRCD_PREFIX, "$ac_default_prefix", [Prefix where the ircd is installed.])
else
	dnl Don't get bitten by Cygwin's stupidity if the user specified
	dnl a custom prefix with a trailing slash
	prefix=`echo $prefix | sed 's/\/$//'`
	AC_DEFINE_UNQUOTED(IRCD_PREFIX, "$prefix", [Prefix where the ircd is installed.])
fi


AC_ARG_ENABLE([fhs-paths],
	[AS_HELP_STRING([--enable-fhs-paths], [Use more FHS-like pathnames (for packagers).])],
	[],
	[dnl detect if the user appears to want --enable-fhs-paths
	AS_IF([test "$libexecdir" = '${exec_prefix}/libexec' && \
		test "$localstatedir" = '${prefix}/var' && \
		test "$libdir" = '${exec_prefix}/lib'],
		[enable_fhs_paths=no],
		[enable_fhs_paths=yes])
	])
dnl use directory structure of cached as default (hack)
AS_IF([test "x$enable_fhs_paths" = "xyes"],
	[dnl Avoid name collisions.
	pkglibexecdir='${libexecdir}/${PACKAGE_TARNAME}'
	rundir=${rundir-'${prefix}/run'}
	pkgrundir='${rundir}/${PACKAGE_TARNAME}'
	pkglocalstatedir='${localstatedir}/${PACKAGE_TARNAME}'
	AC_DEFINE([ENABLE_FHS_PATHS], [1], [Uncomment if FHS pathnames are enabled])],
	[libexecdir='${bindir}'
	pkglibexecdir='${libexecdir}'
	rundir='${sysconfdir}'
	pkgrundir='${rundir}'
	localstatedir='${prefix}'
	pkglocalstatedir='${sysconfdir}'])
pkglibdir='${libdir}/${PACKAGE_TARNAME}'
AC_SUBST([pkglibdir])
AC_SUBST([rundir])
AC_SUBST([pkgrundir])
AC_SUBST([pkglocalstatedir])
AC_DEFINE_DIR([PKGLOCALSTATEDIR], [pkglocalstatedir], [[Directory in which to store state, such as ban database]])
AC_SUBST([pkglibexecdir])
AC_DEFINE_DIR([PKGLIBEXECDIR], [pkglibexecdir], [Directory where binaries the IRCd itself spawns live])


dnl
dnl Check for --with-confdir [deprecated, use --sysconfdir instead]
dnl

AC_ARG_WITH([confdir],
	[AC_HELP_STRING([--with-confdir=DIR],
	       [Directory to install config files [deprecated, use --sysconfdir instead].])],
	[ sysconfdir=`echo $withval | sed 's/\/$//'` ],
	[ confdir='etc' ])
RB_DEFINE_UNQUOTED([ETC_DIR], ["${prefix}/${confdir}"], [Prefix where config files are installed.])


dnl
dnl Check for --with-bindir
dnl

AC_MSG_CHECKING([whether to modify binary directory])
AC_ARG_WITH(bindir,
AC_HELP_STRING([--with-bindir=DIR],
	       [Directory where binary executables are placed.]),
	       [ logdir=`echo $withval | sed 's/\/$//'`
		 AC_MSG_RESULT(yes)],
	       [ AS_IF([test "x$enable_fhs_paths" = "xyes"],
			[bindir="${prefix}/bin"],
			[bindir="${prefix}/bin"])
		 AC_MSG_RESULT(no)])
RB_DEFINE_UNQUOTED([BIN_DIR], ["${bindir}"], [Directory where binary executables are to be found.])
AC_SUBST_DIR([bindir])


dnl
dnl Check for --with-logdir
dnl

AC_MSG_CHECKING([whether to modify logdir])
AC_ARG_WITH(logdir,
AC_HELP_STRING([--with-logdir=DIR],
	       [Directory where to write logfiles.]),
	       [ logdir=`echo $withval | sed 's/\/$//'`
		 AC_MSG_RESULT(yes)],
	       [ AS_IF([test "x$enable_fhs_paths" = "xyes"],
			[logdir="${prefix}/var/log"],
			[logdir="${prefix}/var/${PACKAGE_TARNAME}/log"])
		 AC_MSG_RESULT(no)])
RB_DEFINE_UNQUOTED([LOG_DIR], ["${logdir}"], [Prefix where to write logfiles.])
AC_SUBST_DIR([logdir])


dnl
dnl Check for --with-helpdir
dnl

AC_MSG_CHECKING([whether to modify helpdir])
AC_ARG_WITH(helpdir,
AC_HELP_STRING([--with-helpdir=DIR],
	       [Directory to install help files.]),
	       [ helpdir=`echo $withval | sed 's/\/$//'`
		 AC_MSG_RESULT(yes) ],
	       [ AS_IF([test "x$enable_fhs_paths" = "xyes"],
			[helpdir="${prefix}/share/help"],
			[helpdir="${prefix}/share/${PACKAGE_TARNAME}/help"])
		 AC_MSG_RESULT(no) ])
RB_DEFINE_UNQUOTED([HELP_DIR], ["${helpdir}"], [Prefix where help files are installed.])
AC_SUBST_DIR([helpdir])


dnl
dnl Check for --with-moduledir
dnl

AC_MSG_CHECKING([whether to modify moduledir])
AC_ARG_WITH(moduledir,
	[AC_HELP_STRING([--with-moduledir=DIR],
	       [Directory to install modules.])],
	       [ moduledir=`echo $withval | sed 's/\/$//'`
		 AC_MSG_RESULT(yes)],
	       [ AS_IF([test "x$enable_fhs_paths" = "xyes"],
			[moduledir="${prefix}/lib/modules"],
			[moduledir="${prefix}/lib/${PACKAGE_TARNAME}/modules"])
		 AC_MSG_RESULT(no)
		])
RB_DEFINE_UNQUOTED([MODULE_DIR], ["${moduledir}"], [Prefix where modules are installed.])
AC_SUBST_DIR([moduledir])


dnl
dnl Check for --with-rundir
dnl

AC_MSG_CHECKING([whether or modify rundir])
AC_ARG_WITH([rundir],
	[AC_HELP_STRING([--with-rundir=DIR],
		[Directory in which to store pidfile.])],
	[AC_MSG_RESULT([yes])
	rundir=`echo $withval | sed 's/\/$//'`],
	[AC_MSG_RESULT([no])
	AS_IF([test "x$enable_fhs_paths" = "xyes"],
		[rundir="${prefix}/var/run"],
		[rundir="${prefix}/${PACKAGE_TARNAME}/run"])])
AC_SUBST([rundir])
AC_DEFINE_DIR([PKGRUNDIR], ["${rundir}"], [Directory to store pidfile in.])


dnl
dnl Check for --with-program-prefix
dnl

dnl Installed utility program prefixes (does not affect binaries
dnl installed into pkglibexecdir)
AC_MSG_CHECKING([for program prefix])
AC_ARG_WITH([program-prefix],
	[AS_HELP_STRING([--with-program-prefix=], [If set, programs installed into PATH will be installed with names prefixed by this prefix.])],
	[test "x$with_program_prefix" = "xno" && with_program_prefix=],
	[with_program_prefix=])
AC_MSG_RESULT(["$with_program_prefix"])
PROGRAM_PREFIX="$with_program_prefix"
AC_SUBST([PROGRAM_PREFIX])
AC_DEFINE_UNQUOTED([PROGRAM_PREFIX], ["$with_program_prefix"], [String with which all programs intended to be in PATH are prefixed.])



dnl ***************************************************************************
dnl Third party
dnl



dnl
dnl boost support
dnl

BOOST_VERSION_MIN="1.66"
BOOST_VERSION_MIN_PATCH="0"
BOOST_BUILT_LIBS="system,filesystem,context,coroutine"

AC_MSG_CHECKING([whether you asked to use boost sources included here])
AC_ARG_WITH(included-boost,
AC_HELP_STRING([--with-included-boost[[[=shared]]]], [Use the boost sources from included submodule]),
[
	AC_MSG_RESULT([yes])
	AC_MSG_NOTICE([Bootstrapping boost])

	AM_COND_IF([MINGW],
	[
		BTOOLSET="mingw"
	], [
		dnl the CXX may have a space and then arguments so we must chop them
		BTOOLSET=`echo $CXX | cut -d' ' -f1`
	])

	AM_COND_IF([MINGW],
	[
		boost_libdir="$PWD/boost/stage/lib"
	], [
		boost_libdir="$PWD/boost/lib"
	])

	AC_SUBST(BOOST_LDFLAGS, ["-L$boost_libdir"])
	AC_SUBST(BOOST_CPPFLAGS, ["-isystem $PWD/boost/include"])

	AC_MSG_CHECKING([whether to use shared boost])
	if [[ $withval = "shared" ]]; then
		AC_MSG_RESULT([yes])
		BOOST_LDFLAGS+=" -Wl,-rpath=$boost_libdir"
	else
		AC_MSG_RESULT([no])
		withval="static"
	fi

	boost_linkage="$withval"
	boost_version="boost-${BOOST_VERSION_MIN}.${BOOST_VERSION_MIN_PATCH}"
	bash tools/boostrap.sh $BTOOLSET $BOOST_BUILT_LIBS release $withval multi $boost_version
	if [[ $? != 0 ]]; then
		AC_MSG_ERROR([Failed to build included boost.])
	fi

	AC_DEFINE(HAVE_LIB_BOOST_SYSTEM, 1, [Define if you have boost_system])
	AC_MSG_NOTICE([Bootstrapping boost: done])
],[
	AC_MSG_RESULT([no])
	AX_BOOST_BASE([$BOOST_VERSION_MIN],
	[
		with_included_boost="no"
	], [
		with_included_boost="yes"
		AC_MSG_ERROR([Failed to find boost_system library. (try --with-included-boost)])
	])

	AX_BOOST_ASIO
	AX_BOOST_SYSTEM
	AX_BOOST_FILESYSTEM
	boost_linkage="shared"
])

if [[ "$boost_linkage" = "shared" ]]; then
	AM_COND_IF([MINGW],
	[
		AC_SUBST(BOOST_LIBS, ["-lboost_coroutine-mgw53-1_61.dll -lboost_context-mgw53-1_61.dll -lboost_thread-mgw53-1_61.dll -lboost_filesystem-mgw53-1_61.dll -lboost_system-mgw53-1_61.dll"])
	], [
		AC_SUBST(BOOST_LIBS, ["-lboost_coroutine -lboost_context -lboost_thread -lboost_filesystem -lboost_system"])
	])
else
	AM_COND_IF([MINGW],
	[
		AC_SUBST(BOOST_LIBS, ["$boost_libdir/libboost_coroutine-mgw53-1_61.dll.a $boost_libdir/libboost_context-mgw53-1_61.dll.a $boost_libdir/libboost_thread-mgw53-1_61.dll.a $boost_libdir/libboost_filesystem-mgw53-1_61.dll.a $boost_libdir/libboost_system-mgw53-1_61.dll.a"])
	], [
		AC_SUBST(BOOST_LIBS, ["$boost_libdir/libboost_coroutine.a $boost_libdir/libboost_context.a $boost_libdir/libboost_thread.a $boost_libdir/libboost_filesystem.a $boost_libdir/libboost_system.a"])
	])
fi

RB_DEFINE_UNQUOTED([INC_BOOST_ASIO_HPP], [boost/asio.hpp>], [ boost asio. ])
RB_DEFINE_UNQUOTED([INC_BOOST_CONTEXT_ALL_HPP], [boost/context/all.hpp>], [ boost context. ])
RB_DEFINE_UNQUOTED([INC_BOOST_ASIO_SPAWN_HPP], [boost/asio/spawn.hpp>], [ boost asio spawn. ])
RB_DEFINE_UNQUOTED([INC_BOOST_LEXICAL_CAST_HPP], [boost/lexical_cast.hpp>], [ boost lexical_cast. ])
RB_DEFINE_UNQUOTED([INC_BOOST_TOKENIZER_HPP], [boost/tokenizer.hpp>], [ boost tokenizer. ])
RB_DEFINE_UNQUOTED([INC_BOOST_FILESYSTEM_HPP], [boost/filesystem.hpp>], [ boost filesystem. ])
RB_DEFINE_UNQUOTED([INC_BOOST_DLL_HPP], [boost/dll.hpp>], [ boost DLL. ])
RB_DEFINE_UNQUOTED([INC_BOOST_SPIRIT_QI_HPP], [boost/spirit/include/qi.hpp>], [ spirit qi parser. ])
RB_DEFINE_UNQUOTED([INC_BOOST_SPIRIT_KARMA_HPP], [boost/spirit/include/karma.hpp>], [ spirit karma generator. ])



dnl
dnl RocksDB support
dnl

AC_MSG_CHECKING([whether you asked to use the RocksDB included here])
AC_ARG_WITH(included-rocksdb,
AC_HELP_STRING([--with-included-rocksdb[[[=shared]]]], [Use the RocksDB sources from included submodule]),
[
	AC_MSG_RESULT([yes])
	with_included_rocksdb="yes"

	AC_SUBST(ROCKSDB_CPPFLAGS, ["-isystem $PWD/rocksdb/include"])
	AC_SUBST(ROCKSDB_LDFLAGS, ["-L$PWD/rocksdb/"])

	AC_MSG_CHECKING([whether to use shared RocksDB])
	if [[ $withval = "shared" ]]; then
		AC_MSG_RESULT([yes])
		rocksdb_linkage="shared_lib"
		AC_MSG_NOTICE([Shared RocksDB linkage requires running charybdis with an intact build directory])
		ROCKSDB_LDFLAGS+=" -Wl,-rpath=$PWD/rocksdb/"
		AC_SUBST(ROCKSDB_LIBS, ["-lrocksdb"])
	else
		AC_MSG_RESULT([no])
		rocksdb_linkage="static_lib"
		AC_MSG_NOTICE([static RocksDB linkage requires multiple dependencies])
		AC_MSG_NOTICE([| You will need: bzip2, zlib, snappy])
		AC_SUBST(ROCKSDB_LIBS, ["$PWD/rocksdb/librocksdb.a"])
	fi

	bash tools/buildrocks.sh $rocksdb_linkage
],[
	AC_MSG_RESULT([no])
	with_included_rocksdb="no"

	AC_CHECK_LIB(rocksdb, rocksdb_open, [], [
		AC_MSG_ERROR([Unable to find required RocksDB package. Try apt-get install librocksdb-dev])
	])

	AC_SUBST(ROCKSDB_CPPFLAGS, [])
	AC_SUBST(ROCKSDB_LDFLAGS, [])
	AC_SUBST(ROCKSDB_LIBS, ["-lrocksdb"])
])



dnl
dnl SpiderMonkey support
dnl

AC_MSG_CHECKING([whether you asked to use the JS engine included here])
AC_ARG_WITH(included-js,
AC_HELP_STRING([--with-included-js[[[=shared]]]], [Use the JS engine (SpiderMonkey) sources we include here]),
[
	AC_MSG_RESULT([yes])
	with_included_js="yes"

	AC_SUBST(JS_CPPFLAGS)
	JS_CPPFLAGS+=" -isystem $PWD/gecko-dev/js/src/build_OPT.OBJ/dist/include"
	#JS_CPPFLAGS+=" -I$PWD/gecko-dev/js/src/build_OPT.OBJ/dist/include"

	AC_SUBST(JS_LDFLAGS)
	JS_LDFLAGS+=" -L$PWD/gecko-dev/js/src/build_OPT.OBJ/dist/sdk/lib"
	JS_LDFLAGS+=" -L$PWD/gecko-dev/js/src/build_OPT.OBJ/intl/icu/target/lib"
	JS_LDFLAGS+=" -L$PWD/gecko-dev/js/src/build_OPT.OBJ/js/src"

	AC_SUBST(JS_LIBS)
	JS_LIBS+=" -lmozjs-52"
	JS_LIBS+=" -lmozglue"

	dnl !!!!
	dnl HACK BUG-WORKAROUND - Mozilla forgot to include this in their lib?
	dnl Runtime segfault (unresolved dynamic function address) if this is not specified
	#JS_LIBS+=" $PWD/gecko-dev/js/src/build_OPT.OBJ/mfbt/Unified_cpp_mfbt0.o"
	#JS_LIBS+=" $PWD/gecko-dev/js/src/build_OPT.OBJ/mfbt/Unified_cpp_mfbt1.o"
	JS_LIBS+=" $PWD/gecko-dev/js/src/build_OPT.OBJ/mozglue/misc/TimeStamp.o"

	AC_MSG_CHECKING([whether to use shared JS engine])
	if [[ $withval = "shared" ]]; then
		AC_MSG_RESULT([yes])
		AC_MSG_NOTICE([Shared SpiderMonkey linkage requires running charybdis with an intact build directory])
		js_linkage="shared"
		JS_LDFLAGS+=" -Wl,-rpath=$PWD/gecko-dev/js/src/build_OPT.OBJ/dist/sdk/lib"
		JS_LDFLAGS+=" -Wl,-rpath=$PWD/gecko-dev/js/src/build_OPT.OBJ/intl/icu/target/lib"
	else
		AC_MSG_RESULT([no])
		js_linkage="static"
		JS_LIBS+=" -ljs_static"
	fi

	js_branch="esr52"
	js_jobs="4"

	if [[ $DEBUG ]]; then
		js_options="--disable-optimize --enable-debug --disable-js-shell"
	else
		js_options="--enable-optimize --disable-js-shell"
	fi

	bash tools/buildjs.sh "$js_branch" "$js_options" "$js_jobs"

	RB_DEFINE_UNQUOTED([ENABLE_JS], [1], [ Enable JavaScript support. ])
	RB_DEFINE_UNQUOTED([INC_JSAPI_H], [jsapi.h>], [ SpiderMonkey JavaScript API. ])
	RB_DEFINE_UNQUOTED([INC_JSFRIENDAPI_H], [jsfriendapi.h>], [ SpiderMonkey JavaScript Extended API. ])
	RB_DEFINE_UNQUOTED([INC_JS_CONVERSIONS_H], [js/Conversions.h>], [ SpiderMonkey JavaScript Conversions. ])
],[
	AC_MSG_RESULT([no])
	with_included_js="no"

	dnl TODO mumble mumble
	AC_CHECK_LIB(mozjs-52, _Z11JS_ShutDownv,
	[

	], [
		AC_MSG_WARN([Unable to find JS engine (SpiderMonkey 52) package. Try apt-get install libmozjs-dev])
	])

	dnl TODO
	dnl AC_SUBST(JS_CPPFLAGS, ["-I/usr/include/mozjs-52"])
	dnl AC_SUBST(JS_LDFLAGS, [])
	dnl AC_SUBST(JS_LIBS, ["-lmozjs-52"])
])

dnl TODO use an $enable_js var
AM_CONDITIONAL([JS], [[[[ $with_included_js = yes ]]]])



dnl
dnl libgmp support
dnl

PKG_CHECK_MODULES(GMP, [gmp], [have_gmp="yes"], [have_gmp="no"])
AM_CONDITIONAL([GMP], [test "x$have_gmp" = "xyes"])

AC_SUBST(GMP_CPPFLAGS, [])
AC_SUBST(GMP_LDFLAGS, [])
AC_SUBST(GMP_LIBS, ["-lgmp"])



dnl
dnl libsodium (NaCl) crypto support
dnl

dnl PKG_CHECK_MODULES(SODIUM, [sodium], [have_sodium="yes"], [have_sodium="no"])
AC_CHECK_LIB([sodium], sodium_init, [have_sodium="yes"], [have_sodium="no"])
AM_CONDITIONAL([SODIUM], [test "x$have_sodium" = "xyes"])

AM_COND_IF([SODIUM], [],
[
	AC_MSG_ERROR([Failed to find libsodium (The NaCl cryptographic library)])
])

AC_SUBST(SODIUM_CPPFLAGS, [])
AC_SUBST(SODIUM_LDFLAGS, [])
AC_SUBST(SODIUM_LIBS, ["-lsodium"])



dnl
dnl OpenSSL support
dnl

AC_MSG_CHECKING([for OpenSSL])
AC_ARG_ENABLE(openssl,
[AC_HELP_STRING([--enable-openssl[=DIR]],[Enable OpenSSL support (DIR optional).])
AC_HELP_STRING([--disable-openssl],[Disable OpenSSL support.])],
[cf_enable_openssl=$enableval],
[cf_enable_openssl="auto"])

if test "$cf_enable_openssl" != "no" ; then
	cf_openssl_basedir=""
	if test "$cf_enable_openssl" != "auto" &&
	test "$cf_enable_openssl" != "yes" ; then
		dnl Support for --enable-openssl=/some/place
		cf_openssl_basedir="`echo ${cf_enable_openssl} | sed 's/\/$//'`"
	else
	dnl Do the auto-probe here.  Check some common directory paths.
		for dirs in /usr/local/ssl /usr/pkg /usr/local \
		/usr/local/openssl ; do
			if test -f "${dirs}/include/openssl/opensslv.h" ; then
				cf_openssl_basedir="${dirs}"
			break
			fi
		done
		unset dirs
	fi
	dnl Now check cf_openssl_found to see if we found anything.
	if test ! -z "$cf_openssl_basedir"; then
		if test -f "${cf_openssl_basedir}/include/openssl/opensslv.h" ; then
			SSL_CFLAGS="-I${cf_openssl_basedir}/include"
			SSL_LIBS="-L${cf_openssl_basedir}/lib"
		else
		dnl OpenSSL wasn't found in the directory specified.  Naughty
		dnl administrator...
		cf_openssl_basedir=""
		fi
	else
	dnl Check for stock FreeBSD 4.x and 5.x systems, since their files
	dnl are in /usr/include and /usr/lib.  In this case, we don't want to
	dnl change INCLUDES or LIBS, but still want to enable OpenSSL.
	dnl We can't do this check above, because some people want two versions
	dnl of OpenSSL installed (stock FreeBSD 4.x/5.x and /usr/local/ssl)
	dnl and they want /usr/local/ssl to have preference.
		if test -f "/usr/include/openssl/opensslv.h" ; then
			cf_openssl_basedir="/usr"
		fi
	fi

	dnl If we have a basedir defined, then everything is okay.  Otherwise,
	dnl we have a problem.
	if test ! -z "$cf_openssl_basedir"; then
		AC_MSG_RESULT($cf_openssl_basedir)
		cf_enable_openssl="yes"
	else
		AC_MSG_RESULT([not found. Specify a correct path?])
		cf_enable_openssl="no"
	fi
	unset cf_openssl_basedir
else
	dnl If --disable-openssl was specified
	AC_MSG_RESULT(disabled)
fi

CPPFLAGS="$CPPFLAGS $SSL_CFLAGS"
if test "$cf_enable_openssl" != no; then
	dnl Check OpenSSL version (must be 0.9.7 or above!)
	AC_MSG_CHECKING(for OpenSSL 0.9.7 or above)
	AC_RUN_IFELSE(
		[AC_LANG_PROGRAM(
	    	[#include <openssl/opensslv.h>
		#include <stdlib.h>],
		[[if (OPENSSL_VERSION_NUMBER >= 0x00907000)
		exit(0); else exit(1);]])],
	cf_enable_openssl=yes,
	cf_enable_openssl=no,
	cf_enable_openssl=no)

	if test "$cf_enable_openssl" != no; then
		AC_MSG_RESULT(found)
	else
	        AC_MSG_RESULT(no - OpenSSL support disabled)
	fi

fi

if test "$cf_enable_openssl" != no; then
	CPPFLAGS="$CPPFLAGS $SSL_LIBS"
	AC_CHECK_LIB(crypto, RAND_status,
		[cf_enable_openssl=yes],
		[cf_enable_openssl=no])
fi

if test "$cf_enable_openssl" != no; then
	CPPFLAGS="$CPPFLAGS $SSL_LIBS"
	AC_CHECK_LIB(ssl, SSL_read,
		[SSL_LIBS="$SSL_LIBS -lssl -lcrypto"],
		[cf_enable_openssl=no], [-lcrypto])
fi

AC_SUBST(SSL_SRCS_ENABLE)
AC_SUBST(SSL_INCLUDES)
AC_SUBST(SSL_CFLAGS)
AC_SUBST(SSL_LIBS)



dnl
dnl mbedTLS support
dnl

AC_ARG_ENABLE(mbedtls,
[AC_HELP_STRING([--enable-mbedtls], [Enable mbedTLS support.])
AC_HELP_STRING([--disable-mbedtls], [Disable mbedTLS support.])],
[cf_enable_mbedtls=$enableval],
[cf_enable_mbedtls="auto"])

if test "$cf_enable_mbedtls" != no; then
	LIBS="$LIBS $MBEDTLS_LIBS"
	AC_CHECK_LIB(mbedtls, mbedtls_ssl_init, [
		MBEDTLS_LIBS="$MBEDTLS_LIBS -lmbedtls -lmbedx509 -lmbedcrypto"
		cf_enable_mbedtls=yes
	], [cf_enable_mbedtls=no], [-lmbedx509 -lmbedcrypto])
fi

AC_SUBST(MBEDTLS_CFLAGS)
AC_SUBST(MBEDTLS_LIBS)



dnl
dnl GnuTLS support
dnl

AC_MSG_CHECKING(for GnuTLS)
AC_ARG_ENABLE(gnutls,
[AC_HELP_STRING([--enable-gnutls],[Enable GnuTLS support.])
AC_HELP_STRING([--disable-gnutls],[Disable GnuTLS support.])],
[cf_enable_gnutls=$enableval],
[cf_enable_gnutls="auto"])

if test "$cf_enable_gnutls" != no; then
       PKG_CHECK_MODULES(GNUTLS, [gnutls], [
               cf_enable_gnutls="yes"
       ], [cf_enable_gnutls="no"])
fi

AC_SUBST(GNUTLS_CFLAGS)
AC_SUBST(GNUTLS_LIBS)


dnl mbed TLS is given highest preference when no specified TLS library is provided
if test "$cf_enable_openssl" = "auto" -a "$cf_enable_mbedtls" = "yes"; then
       cf_enable_openssl="no"
fi

if test "$cf_enable_gnutls" = "auto" -a "$cf_enable_openssl" = "yes" -a "$cf_enable_mbedtls" = "yes"; then
       cf_enable_gnutls="no"
fi

if test x"$cf_enable_openssl" != xno; then
	AC_DEFINE(HAVE_OPENSSL,1,[Has OpenSSL])
	GNUTLS_CFLAGS=""
	GNUTLS_LIBS=""
	MBEDTLS_LIBS=""
	MBEDTLS_CFLAGS=""
	SSL_TYPE="openssl"
elif test x"$cf_enable_mbedtls" != xno; then
	AC_DEFINE(HAVE_MBEDTLS, 1, [Has mbedTLS])
	SSL_LIBS=""
	SSL_CFLAGS=""
	GNUTLS_CFLAGS=""
	GNUTLS_LIBS=""
	SSL_TYPE="mbedtls"
elif test x"$cf_enable_gnutls" != xno; then
	AC_DEFINE(HAVE_GNUTLS, 1, [Has GnuTLS])
	SSL_LIBS=""
	SSL_CFLAGS=""
	MBEDTLS_LIBS=""
	MBEDTLS_CFLAGS=""
	SSL_TYPE="gnutls"
fi



dnl
dnl zlib support
dnl

AC_ARG_WITH(zlib-path,
AC_HELP_STRING([--with-zlib-path=DIR],[Path to libz.so for ziplinks support.]),
[LIBS="$LIBS -L$withval"],)

AC_ARG_ENABLE(zlib,
AC_HELP_STRING([--disable-zlib],[Disable ziplinks support]),
[zlib=$enableval],[zlib=yes])

if test "$zlib" = yes; then

AC_CHECK_HEADER(zlib.h, [
	AC_CHECK_LIB(z, zlibVersion,
	[
		AC_SUBST(ZLIB_LD, -lz)
		AC_DEFINE(HAVE_LIBZ, 1, [Define to 1 if zlib (-lz) is available.])
	], zlib=no)
], zlib=no)

fi



dnl
dnl PCRE2 support
dnl

PKG_CHECK_MODULES(PCRE, [libpcre2-8], [have_pcre="yes"], [have_pcre="no"])
AM_CONDITIONAL([PCRE], [test "x$have_pcre" = "xyes"])



dnl
dnl Additional linkages
dnl

AM_COND_IF([MINGW],
[

], [
	LIBS+="-lpthread -latomic"
])



dnl ***************************************************************************
dnl Application settings
dnl

AC_DEFINE([NICKNAMEHISTORYLENGTH], 15000, [Size of the WHOWAS array.])
AC_DEFINE([CHANNEL_HEAP_SIZE],     8192, [Size of the channel heap.])
AC_DEFINE([BAN_HEAP_SIZE],         4096, [Size of the ban heap.])
AC_DEFINE([CLIENT_HEAP_SIZE],      8192, [Size of the client heap.])
AC_DEFINE([LCLIENT_HEAP_SIZE],     1024, [Size of the local client heap.])
AC_DEFINE([PCLIENT_HEAP_SIZE],     256, [Size of the pre-client heap.])
AC_DEFINE([USER_HEAP_SIZE],        8192, [Size of the user heap.])
AC_DEFINE([DNODE_HEAP_SIZE],       8192, [Size of the dlink_node heap.])
AC_DEFINE([TOPIC_HEAP_SIZE],       4096, [Size of the topic heap.])
AC_DEFINE([LINEBUF_HEAP_SIZE],     2048, [Size of the linebuf heap.])
AC_DEFINE([MEMBER_HEAP_SIZE],      32768, [Sizeof member heap.])
AC_DEFINE([ND_HEAP_SIZE],          512, [Size of the nick delay heap.])
AC_DEFINE([CONFITEM_HEAP_SIZE],    256, [Size of the confitem heap.])
AC_DEFINE([MONITOR_HEAP_SIZE],     1024, [Size of the monitor heap.])
AC_DEFINE([FD_HEAP_SIZE],          1024, [Size of fd heap.])
AC_DEFINE([AWAY_HEAP_SIZE],        512, [Size of away heap.])


dnl
dnl --enable-oper-chghost
dnl

AC_ARG_ENABLE(oper-chghost,
AC_HELP_STRING([--enable-oper-chghost],[Enable opers to use the CHGHOST command]),
[operchghost=$enableval],[operchghost=no])

if test "$operchghost" = yes; then
	AC_DEFINE(ENABLE_OPER_CHGHOST, 1, [Define this to enable opers to use the CHGHOST command.])
fi


dnl
dnl --with-nicklen
dnl

AC_ARG_WITH(nicklen,
AC_HELP_STRING([--with-nicklen=LENGTH],[Set the upper-bound nick length to LENGTH (default 31, max 50)]),
[
  if ! expr "$withval" + 0 >/dev/null 2>&1; then
	AC_ERROR([NICKLEN must be a numeric value])
  fi
  if test $withval -gt 50; then
	NICKLEN=50
	AC_MSG_WARN([NICKLEN has a hard limit of 50. Setting NICKLEN=50])
  elif test $withval -lt 9; then
	NICKLEN=9
	AC_MSG_WARN([NICKLEN has a lower limit of 9. Setting NICKLEN=9])
  else
	NICKLEN="$withval"
  fi
], [NICKLEN=31])

AC_DEFINE_UNQUOTED(NICKLEN, (${NICKLEN}+1), [Nickname length])


dnl
dnl --with-topiclen
dnl

AC_ARG_WITH(topiclen,
AC_HELP_STRING([--with-topiclen=NUMBER],[Set the max topic length to NUMBER (default 390, max 390)]),
[
 if test $withval -gt 390; then
	TOPICLEN=390
	AC_MSG_WARN([TOPICLEN has a hard limit of 390. Setting TOPICLEN=390])
 else
 	TOPICLEN=$withval
 fi
], [TOPICLEN=390])

AC_DEFINE_UNQUOTED(TOPICLEN, ${TOPICLEN}, [Maximum topic length (<=390)])



dnl ***************************************************************************
dnl Branding defined in the compilation
dnl

VERSION_CMD="git describe --tags"
RB_VERSION=`$VERSION_CMD`
RB_DEFINE_UNQUOTED([VERSION], ["$RB_VERSION"], [Version generated at configuration time.])

DATESTR_CMD="date"
RB_DATESTR=`$DATESTR_CMD`
RB_DEFINE_UNQUOTED([DATESTR], ["$RB_DATESTR"], [Readable date string of configuration time.])

DATECODE_CMD="date +%s"
RB_DATECODE=`$DATECODE_CMD`
RB_DEFINE_UNQUOTED([DATECODE], [$RB_DATECODE], [UNIX epoch time at configuration time.])

dnl TODO: XXX: These have better names than the above, rm previous eventually.
RB_DEFINE_UNQUOTED([TIME_CONFIGURED], [$RB_DATECODE], [UNIX epoch time at configuration time.])
RB_DEFINE_UNQUOTED([DATE_CONFIGURED], ["$RB_DATESTR"], [Convenience string of RB_TIME_CONFIGURED])
CPPDEFINE([RB_TIME_COMPILED], [$(date +%s)])


dnl
dnl --with-custom-branding
dnl

AC_MSG_CHECKING([whether custom branding is requested])
AC_ARG_WITH(custom-branding, AC_HELP_STRING([--with-custom-branding=NAME], [Custom branding name.]),
[
	AC_DEFINE_UNQUOTED(BRANDING_NAME, ["$withval"], [Custom branding name.])
	AC_DEFINE(CUSTOM_BRANDING, 1, [Define if custom branding is enabled.])
	AC_MSG_RESULT([yes])
],[
	AC_DEFINE_UNQUOTED(BRANDING_NAME, ["$PACKAGE_NAME"], [Current package])
	AC_MSG_RESULT([no])
])


dnl
dnl --with-custom-version
dnl

AC_MSG_CHECKING([whether a custom version is requested])
AC_ARG_WITH(custom-version, AC_HELP_STRING([--with-custom-version=NAME], [Custom version branding.]),
[
	AC_DEFINE_UNQUOTED(BRANDING_VERSION, ["$withval"], [Custom branding version.])
	AC_MSG_RESULT([yes])
], [
	AC_DEFINE_UNQUOTED(BRANDING_VERSION, ["$RB_VERSION"], [Current version])
	AC_MSG_RESULT([no])
])



dnl ***************************************************************************
dnl Misc
dnl


AC_SUBST(MODULES_LIBS)
AC_SUBST(MOD_TARGET)
AC_SUBST(PICFLAGS)
AC_SUBST(SEDOBJ)
AC_SUBST(CFLAGS)


AC_CONFIG_COMMANDS([tools/genssl_chmod], [chmod 755 tools/genssl])



dnl ***************************************************************************
dnl Output
dnl


AC_OUTPUT


if [[ $DEBUG ]]; then
	debug="yes"
else
	debug="no"
fi

dnl Make it look sexay!
echo
echo "Configured ........................ $PACKAGE_NAME $PACKAGE_VERSION"
echo "Version ........................... $RB_VERSION"
echo "Configuration time ................ $RB_DATESTR"
echo "Compiler .......................... $CXX"
echo "Compiler flags (CXXFLAGS) ......... $CXXFLAGS"
echo "Building boost .................... $with_included_boost"
echo "Building RocksDB................... $with_included_rocksdb"
echo "Building JS (SpiderMonkey) ........ $with_included_js"
echo "GNU MP support .................... $have_gmp"
echo "Sodium support .................... $have_sodium"
echo "SSL support........................ $SSL_TYPE"
echo "Precompiled headers ............... $build_pch"
echo "Developer debug ................... $debug"
echo "IPv6 support ...................... $ipv6"
echo "Installing into ................... $prefix"
echo
echo "* Ready to build $PACKAGE_NAME"
echo "* Now run 'make'"