construct/configure.ac

AC_PREREQ(2.63)
AUTOMAKE_OPTIONS = 1.11

AC_INIT([construct], [1.0-dev])
AC_GNU_SOURCE
AC_USE_SYSTEM_EXTENSIONS
AC_PREFIX_DEFAULT([/])
AC_CONFIG_MACRO_DIR([tools/m4])

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           \
	modules/Makefile        \
	share/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+=" -g"
	CXXFLAGS+=" -ggdb"
], [
	CXXFLAGS+=" -march=native"
	CXXFLAGS+=" -O$optimize_level"
	CXXFLAGS+=" -g"
	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/stat.h, [SYS_STAT_H])
RB_CHK_SYSHEADER(sys/statvfs.h, [SYS_STATVFS_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           \
	posix_fadvise       \
])

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

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

dnl
dnl libdir
dnl

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

dnl
dnl localstatedir
dnl

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

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

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

dnl
dnl datadir
dnl

datadir="$prefix/share"
AC_SUBST_DIR([datadir])
RB_DEFINE_UNQUOTED([DATA_DIR], ["$datadir/${PACKAGE_TARNAME}"], [Directory where read-only assets go.])

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 Check for --with-webappdir
dnl

AC_MSG_CHECKING([whether to modify webappdir])
AC_ARG_WITH(webappdir, [AC_HELP_STRING([--with-webappdir=DIR], [Directory to install served assets])],
[
	AC_MSG_RESULT(yes)
	webappdir=`echo $withval | sed 's/\/$//'`
], [
	AC_MSG_RESULT(no)
	webappdir="${datadir}/webapp"
])

RB_DEFINE_UNQUOTED([WEBAPP_DIR], ["$webappdir"], [Prefix where website assets are served from.])
AC_SUBST_DIR([webappdir])


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 OpenSSL support
dnl
dnl

RB_CHK_SYSHEADER(openssl/err.h,    [OPENSSL_ERR_H])
RB_CHK_SYSHEADER(openssl/sha.h,    [OPENSSL_SHA_H])
RB_CHK_SYSHEADER(openssl/ssl.h,    [OPENSSL_SSL_H])
RB_CHK_SYSHEADER(openssl/ec.h,     [OPENSSL_EC_H])
RB_CHK_SYSHEADER(openssl/rsa.h,    [OPENSSL_RSA_H])
RB_CHK_SYSHEADER(openssl/x509.h,   [OPENSSL_X509_H])
RB_CHK_SYSHEADER(openssl/evp.h,    [OPENSSL_EVP_H])
RB_CHK_SYSHEADER(openssl/ripemd.h, [OPENSSL_RIPEMD_H])
RB_CHK_SYSHEADER(openssl/dh.h,     [OPENSSL_DH_H])

AC_CHECK_LIB(ssl, SSL_version,
[
	have_ssl="yes"
	AC_SUBST(SSL_CPPFLAGS, [])
	AC_SUBST(SSL_LDFLAGS, [])
	AC_SUBST(SSL_LIBS, ["-lssl"])
	AC_DEFINE(HAVE_SSL, 1, [Define to 1 if libssl (-lssl) is available.])
], [
	have_ssl="no"
	AC_MSG_ERROR([libssl is required but not found. Try apt-get install libssl1.0-dev])
])

AM_CONDITIONAL([SSL], [test "x$have_ssl" = "xyes"])

AC_CHECK_LIB(crypto, SSLeay_version,
[
	have_crypto="yes"
	AC_SUBST(CRYPTO_CPPFLAGS, [])
	AC_SUBST(CRYPTO_LDFLAGS, [])
	AC_SUBST(CRYPTO_LIBS, ["-lcrypto"])
	AC_DEFINE(HAVE_CRYPTO, 1, [Define to 1 if libcrypto (-lcrypto) is available.])
], [
	have_crypto="no"
	AC_MSG_ERROR([libcrypto is required but not found.])
])

AM_CONDITIONAL([CRYPTO], [test "x$have_crypto" = "xyes"])

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 [[ $withval = "static" ]]; then
		AC_MSG_RESULT([no])
		withval="static"
	else
		AC_MSG_RESULT([yes])
		BOOST_LDFLAGS+=" -Wl,-rpath=$boost_libdir"
		withval="shared"
	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 [[ $withval = "static" ]]; then
		AC_MSG_RESULT([no])
		withval="static"
		rocksdb_linkage="static_lib"
		AC_MSG_NOTICE([static RocksDB linkage requires multiple dependencies])
		AC_MSG_NOTICE([| You will need: bzip2, zlib, snappy])
		AC_SUBST(ROCKSDB_LIBS, ["$PWD/deps/rocksdb/librocksdb.a"])
	else
		AC_MSG_RESULT([yes])
		withval="shared"
		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"])
	fi

	bash tools/buildrocks.sh $rocksdb_linkage "v5.15.10"
	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 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([DATE_CONFIGURED], ["$RB_DATESTR"], [Convenience string of RB_TIME_CONFIGURED])
CPPDEFINE([RB_TIME_CONFIGURED], [$(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 ....................... $have_ssl"
echo "Crypto support .................... $have_crypto"
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'"