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([construct], [1.0])
AC_GNU_SOURCE
AC_USE_SYSTEM_EXTENSIONS
AC_CONFIG_MACRO_DIR([m4])
AC_PREFIX_DEFAULT([/])

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++])

CXXFLAGS="-pipe"
AC_PROG_CXX
AC_PROG_CXX_C_O
AC_PROG_LIBTOOL
AC_PROG_MAKE_SET
AC_LANG(C++)
AC_CONFIG_HEADER(include/ircd/config.h)
AX_CXX_COMPILE_STDCXX([17], [gnu], [mandatory], 201500)


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

AC_CONFIG_FILES(\
	Makefile                \
	include/ircd/Makefile   \
	construct/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(CXXFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(LDFLAGS)
AC_SUBST(LIBS)

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
dnl Platform
dnl

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* ]]]])

RB_DEFINE_UNQUOTED([CXX], ["$CXX"], [CXX Compiler])

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* ]]]])

RB_DEFINE_UNQUOTED([OS], ["$host_os"], [Host operating system])

dnl
dnl The CXX standard check even with the sd6 check wasn't enough for GCC. This
dnl is because we're developing with C++15'ish, which is in some grey area
dnl between C++14 and C++17 and the implementation differs between GCC 5.x and
dnl GCC 6.x. The build will b0rk with GCC 5.x so the version must be checked.
dnl

AC_MSG_CHECKING(whether specific compiler version is sufficient)
AM_COND_IF([GCC],
[
	gvmaj=`$CXX -dumpversion | cut -d"." -f1`
	gvmin=`$CXX -dumpversion | cut -d"." -f2`

	if [[ "$gvmaj" -ge "6" ]]; then
		AC_MSG_RESULT([yes])
	else
		AC_MSG_RESULT([no])
		AC_MSG_ERROR([Did you forget to export CXX=g++-6 ?])
	fi
], [
	AC_MSG_RESULT([yes])
])


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

dnl
dnl Debugging mode
dnl

AC_MSG_CHECKING(whether to enable debugging)
AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug], [Enable debugging suite for development.]),
[
	AC_MSG_RESULT([yes])
	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_MSG_RESULT([no])
	RB_DEFINE_UNQUOTED([DEBUG_LEVEL], [0], [Defined to 0 for release])
])

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

dnl
dnl Explicit assert switch for still using assert() without --enable-debug
dnl

AC_MSG_CHECKING(whether to explicitly enable assertions)
AC_ARG_ENABLE(assert, AC_HELP_STRING([--enable-assert], [Enable assertions without --enable-debug]),
[
	AC_MSG_RESULT([yes])
	AC_SUBST(ASSERT, 1)
], [
	AM_COND_IF(DEBUG,
	[
		AC_MSG_RESULT([no, but assertions are enabled anyway])
		AC_SUBST(ASSERT, 1)
	], [
		AC_MSG_RESULT([no])
	])
])

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

AM_COND_IF(ASSERT,
[
], [
	CPPDEFINE([NDEBUG])
])

dnl
dnl Explicit optimize switch for enabling optimization when using --enable-debug
dnl

AC_MSG_CHECKING(whether to explicitly enable optimized build)
AC_ARG_ENABLE(optimize, AC_HELP_STRING([--enable-optimize], [Enable optimization even with --enable-debug]),
[
	AC_MSG_RESULT([yes])
	AC_SUBST(OPTIMIZE, 1)
], [
	AM_COND_IF(DEBUG,
	[
		AC_MSG_RESULT([no])
	], [
		AC_MSG_RESULT([no, but optimized build is enabled anyway])
		AC_SUBST(OPTIMIZE, 1)
	])
])

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

dnl
dnl Explicit optimization level switch
dnl

AC_MSG_CHECKING(whether to explicitly set the optimization level)
AC_ARG_WITH(optimize-level, AC_HELP_STRING([--with-optimize-level[[[=3]]]], [Explicitly set the optimize level]),
[
	optimize_level=$withval
	AC_MSG_RESULT([yes, enabling optimization level -O$optimize_level])
	AC_SUBST(OPTMIZE_LEVEL, $optimize_level)
	RB_DEFINE_UNQUOTED([OPTIMIZE_LEVEL], [$optimize_level], [User configured optimization level])
], [
	AM_COND_IF(OPTIMIZE,
	[
		optimize_level="3"
		AC_MSG_RESULT([no, but --enable-optimize has implied level -O$optimize_level])
		AC_SUBST(OPTIMIZE_LEVEL, $optimize_level)
		RB_DEFINE_UNQUOTED([OPTIMIZE_LEVEL], [$optimize_level], [Explicitly set release mode optimization])
	], [
		AM_COND_IF(DEBUG,
		[
			optimize_level="g"
			AC_MSG_RESULT([no, but --enable-debug has implied level -O$optimize_level])
			AC_SUBST(OPTIMIZE_LEVEL, $optimize_level)
			RB_DEFINE_UNQUOTED([OPTIMIZE_LEVEL], [$optimize_level], [Debug mode optimization level])
		], [
			optimize_level="3"
			AC_MSG_RESULT([no, but release mode has implied level -O$optimize_level])
			AC_SUBST(OPTIMIZE_LEVEL, $optimize_level)
			RB_DEFINE_UNQUOTED([OPTIMIZE_LEVEL], [$optimize_level], [Release mode optimization])
		])
	])
])

dnl
dnl Explicit log level
dnl
dnl NOTE: Log levels here must be manually sync'ed with ircd/logger.h
dnl

AC_MSG_CHECKING(whether to explicitly set the logging level ceiling)
AC_ARG_WITH(log-level, AC_HELP_STRING([--with-log-level[[[=INFO]]]], [Explicitly set the log level ceiling]),
[
	AC_MSG_RESULT([yes, enabling log level $withval and below])

	level=4
	if [[ $withval = "DEBUG" ]]; then
		level=7
	elif [[ $withval = "DWARNING" ]]; then
		level=6
	elif [[ $withval = "DERROR" ]]; then
		level=5
	elif [[ $withval = "INFO" ]]; then
		level=4
	elif [[ $withval = "NOTICE" ]]; then
		level=3
	elif [[ $withval = "WARNING" ]]; then
		level=2
	elif [[ $withval = "ERROR" ]]; then
		level=1
	elif [[ $withval = "CRITICAL" ]]; then
		level=0
	elif [[ $withval = "-1" ]]; then
		level=-1
	fi

	AC_SUBST(LOG_LEVEL, $level)
	RB_DEFINE_UNQUOTED([LOG_LEVEL], [$level], [Log messages for user configured level and below.])
], [
	AM_COND_IF(DEBUG,
	[
		AC_MSG_RESULT([no, but debug mode enables all log levels through DEBUG])
		AC_SUBST(LOG_LEVEL, 7)
		RB_DEFINE_UNQUOTED([LOG_LEVEL], [7], [Log message level default for DEBUG mode])
	], [
		AC_MSG_RESULT([no])
		AC_SUBST(LOG_LEVEL, 4)
		RB_DEFINE_UNQUOTED([LOG_LEVEL], [4], [Log message level default for release mode])
	])
])

dnl
dnl Profiling mode
dnl

AC_MSG_CHECKING(whether 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(whether 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 Generic Mode compilation
dnl

AC_MSG_CHECKING(whether to enable generic mode or tune for this host)
AC_ARG_ENABLE(generic, AC_HELP_STRING([--enable-generic], [Emit more generic code for pkg binaries.]),
[
	enable_generic="yes"
	AC_MSG_RESULT([yes])
	RB_DEFINE([GENERIC], [1], [Building binary tuned for generic architectures])
], [
	enable_generic="no"
	AC_MSG_RESULT([no])
])

AM_CONDITIONAL([GENERIC], [[[[ "$enable_generic" = "yes" ]]]])

AM_COND_IF([GENERIC],
[
	CXXFLAGS+=" -mtune=generic"
], [
	CXXFLAGS+=" -march=native"
])

dnl
dnl Optimization
dnl

AM_COND_IF([OPTIMIZE],
[
	CXXFLAGS+=" -O$optimize_level"
	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"
	CXXFLAGS+=" -fira-hoist-pressure"
	CXXFLAGS+=" -fbranch-target-load-optimize"
	CXXFLAGS+=" -frerun-loop-opt"

	dnl TODO: lto cannot be enabled until subobject linkage for json::tuple
	dnl is resolved
	dnl
	dnl CXXFLAGS+=" -flto"
	dnl CXXFLAGS+=" -fdevirtualize-at-ltrans"

	dnl remember to axe this when lto is enabled
	CXXFLAGS+=" -ggdb"
], [
	CXXFLAGS+=" -march=native"
	CXXFLAGS+=" -O$optimize_level"
	CXXFLAGS+=" -ggdb"
])

dnl
dnl Compiler intrumentation
dnl

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


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 Compiler warnings
dnl

STACK_USAGE_WARNING=16384
FRAME_SIZE_WARNING=8192
CWARNS=""
AC_MSG_CHECKING(whether 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)
CHARYBDIS_C_GCC_TRY_FLAGS([-Wodr], charybdis_cv_c_gcc_w_odr)

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
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(iosfwd, [IOSFWD])
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])
RB_CHK_SYSHEADER(new, [NEW])
RB_CHK_SYSHEADER(regex, [REGEX])

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])
RB_CHK_SYSHEADER(sys/utsname.h, [SYS_UTSNAME_H])

dnl linux platform
RB_CHK_SYSHEADER(malloc.h, [MALLOC_H])
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 x86 platform
RB_CHK_SYSHEADER(x86intrin.h, [X86INTRIN_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
dnl Miscellaneous operating system specific
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])
],[])

dnl
dnl Linux AIO support
dnl

AM_COND_IF(LINUX,
[
	AC_ARG_ENABLE(aio, AC_HELP_STRING([--disable-aio], [Disable kernel AIO support]),
	[
		aio=$enableval
	], [
		aio=yes
	])
], [])

if test "$aio" = "yes"; then
	IRCD_DEFINE(USE_AIO, [1], [Linux AIO is supported and will be used])
else
	IRCD_DEFINE(USE_AIO, [0], [Define to 1 if you want AIO support (linux only)])
fi

AM_CONDITIONAL([AIO], [[[[ $aio = yes ]]]])


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

PKG_PROG_PKG_CONFIG

if test "$prefix" = "NONE"; then
	prefix="$ac_default_prefix"
else
	dnl Don't get bitten by Cygwin's stupidity if the user specified
	dnl a custom prefix with a trailing slash
	prefix=`echo $prefix | sed 's/\/$//'`
fi

RB_DEFINE_UNQUOTED(PREFIX, ["$prefix"], [Prefix of IRCd install])
AC_SUBST_DIR([prefix])

dnl
dnl bindir
dnl

RB_DEFINE_UNQUOTED([BIN_DIR], ["$(bindir)"], [Directory where binary executables are to be found.])
AC_SUBST_DIR([bindir])

dnl
dnl libdir
dnl

RB_DEFINE_UNQUOTED([LIB_DIR], ["$(libdir)"], [Prefix where libs are installed.])
AC_SUBST_DIR([libdir])

dnl
dnl localstatedir
dnl

dnl Avoid name collisions.
RB_DEFINE_UNQUOTED([LOCALSTATE_DIR], ["$(localstatedir)"], [Prefix where db and logs go.])
AC_SUBST_DIR([localstatedir])

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

RB_DEFINE_UNQUOTED([CONF_DIR], ["$(sysconfdir)"], [Prefix where config files are installed.])
AC_SUBST_DIR([sysconfdir])

dnl
dnl Check for --with-dbdir
dnl

AC_MSG_CHECKING([whether to modify database directory])
AC_ARG_WITH(dbdir, AC_HELP_STRING([--with-dbdir=DIR], [Directory where databases are located]),
[
	AC_MSG_RESULT(yes)
	dbdir=`echo $withval | sed 's/\/$//'`
], [
	AC_MSG_RESULT(no)
	dbdir="${localstatedir}/db/${PACKAGE_TARNAME}"
])

RB_DEFINE_UNQUOTED([DB_DIR], ["$dbdir"], [Directory where databases are located])
AC_SUBST_DIR([dbdir])

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.]),
[
	AC_MSG_RESULT(yes)
	logdir=`echo $withval | sed 's/\/$//'`
], [
	AC_MSG_RESULT(no)
	logdir="${localstatedir}/log/${PACKAGE_TARNAME}"
])

RB_DEFINE_UNQUOTED([LOG_DIR], ["$logdir"], [Prefix where to write logfiles.])
AC_SUBST_DIR([logdir])

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.])],
[
	AC_MSG_RESULT(yes)
	moduledir=`echo $withval | sed 's/\/$//'`
], [
	AC_MSG_RESULT(no)
	moduledir="${libdir}/modules/${PACKAGE_TARNAME}"
])

RB_DEFINE_UNQUOTED([MODULE_DIR], ["$moduledir"], [Prefix where modules are installed.])
AC_SUBST_DIR([moduledir])

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

dnl
dnl
dnl libsodium (NaCl) crypto support
dnl
dnl

dnl PKG_CHECK_MODULES(SODIUM, [sodium], [have_sodium="yes"], [have_sodium="no"])
RB_CHK_SYSHEADER(sodium.h, [SODIUM_H])
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
dnl libgmp support
dnl
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
dnl libmagic support
dnl
dnl

RB_CHK_SYSHEADER(magic.h, [MAGIC_H])
AC_CHECK_LIB(magic, magic_version,
[
	have_magic="yes"
	AC_SUBST(MAGIC_CPPFLAGS, [])
	AC_SUBST(MAGIC_LDFLAGS, [])
	AC_SUBST(MAGIC_LIBS, ["-lmagic"])
	AC_DEFINE(HAVE_MAGIC, 1, [Define to 1 if libmagic (-lmagic) is available.])
], [
	have_magic="no"
	AC_MSG_ERROR([libmagic is required but not found. Try apt-get install libmagic-dev])
])

AM_CONDITIONAL([MAGIC], [test "x$have_magic" = "xyes"])

dnl
dnl
dnl zlib support
dnl
dnl

AC_SUBST(Z_CPPFLAGS)
AC_SUBST(Z_LDFLAGS)
AC_SUBST(Z_LIBS)

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

])

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

dnl
dnl
dnl lz4 support
dnl
dnl

AC_SUBST(LZ4_CPPFLAGS)
AC_SUBST(LZ4_LDFLAGS)
AC_SUBST(LZ4_LIBS)

AC_ARG_WITH(lz4,
AC_HELP_STRING([--with-lz4=[[[DIR]]]], [Path to liblz4.so for lz4 compression support.]),
[
	AC_SUBST(LZ4_LDFLAGS, ["-L$withval"])
], [

])

AC_CHECK_HEADER(lz4.h,
[
	AC_CHECK_LIB(lz4, LZ4_versionNumber,
	[
		lz4=yes
		AC_SUBST(LZ4_LIBS, -llz4)
		AC_DEFINE(HAVE_LIBLZ4, 1, [Define to 1 if liblz4 (-llz4) is available.])
	], [
		lz4=no
	])
], [
	lz4=no
])

dnl
dnl
dnl snappy support
dnl
dnl

AC_SUBST(SNAPPY_CPPFLAGS)
AC_SUBST(SNAPPY_LDFLAGS)
AC_SUBST(SNAPPY_LIBS)

AC_ARG_WITH(snappy,
AC_HELP_STRING([--with-snappy=[[[DIR]]]], [Path to libsnappy.so for snappy compression support.]),
[
	AC_SUBST(SNAPPY_LDFLAGS, ["-L$withval"])
], [

])

AC_CHECK_HEADER(snappy.h,
[
	AC_CHECK_LIB(snappy, snappy_compress,
	[
		snappy=yes
		AC_SUBST(SNAPPY_LIBS, -lsnappy)
		AC_DEFINE(HAVE_LIBSNAPPY, 1, [Define to 1 if libsnappy (-lsnappy) is available.])
	], [
		snappy=no
	])
], [
	snappy=no
])

dnl
dnl
dnl boost support
dnl
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([DEBUG],
	[
		boost_variant="debug"
	], [
		boost_variant="release"
	])

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

	AC_SUBST(BOOST_LDFLAGS, ["-L$boost_libdir"])
	AC_SUBST(BOOST_CPPFLAGS, ["-isystem $PWD/deps/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 $boost_variant $withval multi $boost_version
	AS_IF([ test $? != 0 ],
	[
		AC_MSG_ERROR([Failed to build included boost.])
	])

	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

BOOST_CPPFLAGS+=" -DBOOST_COROUTINES_NO_DEPRECATION_WARNING=1"

dnl
dnl
dnl RocksDB support
dnl
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 $PWD/deps/rocksdb/include"])
	AC_SUBST(ROCKSDB_LDFLAGS, ["-L$PWD/deps/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/deps/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/deps/rocksdb/librocksdb.a"])
	fi

	bash tools/buildrocks.sh $rocksdb_linkage "v5.12.2"
	AS_IF([ test $? != 0 ],
	[
		AC_MSG_ERROR([Failed to build RocksDB])
	])
],[
	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
dnl SpiderMonkey support
dnl
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 $PWD/deps/gecko-dev/js/src/build_OPT.OBJ/dist/include"
	#JS_CPPFLAGS+=" -I$PWD/deps/gecko-dev/js/src/build_OPT.OBJ/dist/include"

	AC_SUBST(JS_LDFLAGS)
	JS_LDFLAGS+=" -L$PWD/deps/gecko-dev/js/src/build_OPT.OBJ/dist/sdk/lib"
	JS_LDFLAGS+=" -L$PWD/deps/gecko-dev/js/src/build_OPT.OBJ/intl/icu/target/lib"
	JS_LDFLAGS+=" -L$PWD/deps/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/deps/gecko-dev/js/src/build_OPT.OBJ/mfbt/Unified_cpp_mfbt0.o"
	#JS_LIBS+=" $PWD/deps/gecko-dev/js/src/build_OPT.OBJ/mfbt/Unified_cpp_mfbt1.o"
	JS_LIBS+=" $PWD/deps/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/deps/gecko-dev/js/src/build_OPT.OBJ/dist/sdk/lib"
		JS_LDFLAGS+=" -Wl,-rpath=$PWD/deps/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"

	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"

	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
dnl OpenSSL support
dnl
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
dnl mbedTLS support
dnl
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
dnl GnuTLS support
dnl
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
dnl Additional linkages
dnl
dnl

AM_COND_IF([MINGW],
[

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

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

dnl
dnl --with-mxid-maxlen
dnl

AC_ARG_WITH(mxid-maxlen,
AC_HELP_STRING([--with-mxid-maxlen=LENGTH],[Set the upper-bound mxid length to LENGTH (default 255, max 511)]),
[
  if ! expr "$withval" + 0 >/dev/null 2>&1; then
	AC_ERROR([MXID_MAXLEN must be a numeric value])
  fi
  if test $withval -gt 511; then
	MXID_MAXLEN=511
	AC_MSG_WARN([MXID_MAXLEN has a hard limit of 511. Setting MXID_MAXLEN=511])
  elif test $withval -lt 4; then
	MXID_MAXLEN=4
	AC_MSG_WARN([MXID_MAXLEN has a lower limit of 4. Setting MXID_MAXLEN=4])
  else
	MXID_MAXLEN="$withval"
  fi
], [
	MXID_MAXLEN=255
])

RB_DEFINE_UNQUOTED([MXID_MAXLEN], [$MXID_MAXLEN], [Maximum string length of an MXID (not including null)])

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

VERSION_COMMIT_CMD="git rev-parse --short HEAD"
RB_VERSION_COMMIT=`$VERSION_COMMIT_CMD`
RB_DEFINE_UNQUOTED([VERSION_COMMIT], ["$RB_VERSION_COMMIT"], [Git commit at configuration time.])
#CPPDEFINE([RB_VERSION_COMMIT], [`$VERSION_COMMIT_CMD`])

VERSION_BRANCH_CMD="git rev-parse --abbrev-ref HEAD"
RB_VERSION_BRANCH=`$VERSION_BRANCH_CMD`
RB_DEFINE_UNQUOTED([VERSION_BRANCH], ["$RB_VERSION_BRANCH"], [Git branch at configuration time.])
#CPPDEFINE([RB_VERSION_BRANCH], [`$VERSION_BRANCH_CMD`])

VERSION_TAG_CMD="git describe --tags --abbrev=0 --dirty"
RB_VERSION_TAG=`$VERSION_TAG_CMD`
RB_DEFINE_UNQUOTED([VERSION_TAG], ["$RB_VERSION_TAG"], [Git tag at configuration time.])
#CPPDEFINE([RB_VERSION_TAG], [`$VERSION_TAG_CMD`])

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
dnl Misc
dnl

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

AC_OUTPUT

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

if [[ $OPTIMIZE ]]; then
	optimize="yes"
else
	optimize="no"
fi

if [[ $ASSERT ]]; then
	assert="yes"
else
	assert="no"
fi


dnl Make it look sexay!
echo
echo "Configured ........................ $PACKAGE_NAME $PACKAGE_VERSION"
echo "Version ........................... $RB_VERSION"
echo "Configuration time ................ $RB_DATESTR"
echo "Host OS ........................... $host_os"
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 "Ziplinks (libz) support ........... $zlib"
echo "LZ4 support ....................... $lz4"
echo "Snappy support .................... $snappy"
echo "GNU MP support .................... $have_gmp"
echo "Sodium support .................... $have_sodium"
echo "SSL support ....................... $SSL_TYPE"
echo "Magic support ..................... $have_magic"
echo "Linux AIO support ................. $aio"
echo "IPv6 support ...................... $ipv6"
echo "Precompiled headers ............... $build_pch"
echo "Developer debug ................... $debug"
echo "Developer assert .................. $assert"
echo "Optimized build ................... $optimize"
echo "Optimization level ................ $optimize_level"
echo "Generic binary .................... $enable_generic"
echo "Logging level ..................... $LOG_LEVEL"
echo "Installing into ................... $prefix"
echo
echo "* Ready to build $PACKAGE_NAME"
echo "* Now run 'make'"