#!/bin/sh
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.707 2016/11/11 23:31:29 tg Exp $'
#-
# Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
#		2011, 2012, 2013, 2014, 2015, 2016
#	mirabilos <m@mirbsd.org>
#
# Provided that these terms and disclaimer and all copyright notices
# are retained or reproduced in an accompanying document, permission
# is granted to deal in this work without restriction, including un-
# limited rights to use, publicly perform, distribute, sell, modify,
# merge, give away, or sublicence.
#
# This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
# the utmost extent permitted by applicable law, neither express nor
# implied; without malicious intent or gross negligence. In no event
# may a licensor, author or contributor be held liable for indirect,
# direct, other damage, loss, or other issues arising in any way out
# of dealing in the work, even if advised of the possibility of such
# damage or existence of a defect, except proven that it results out
# of said person's immediate fault when using the work as intended.
#-
# People analysing the output must whitelist conftest.c for any kind
# of compiler warning checks (mirtoconf is by design not quiet).
#
# Used environment documentation is at the end of this file.

LC_ALL=C
export LC_ALL

case $ZSH_VERSION:$VERSION in
:zsh*) ZSH_VERSION=2 ;;
esac

if test -n "${ZSH_VERSION+x}" && (emulate sh) >/dev/null 2>&1; then
	emulate sh
	NULLCMD=:
fi

if test -d /usr/xpg4/bin/. >/dev/null 2>&1; then
	# Solaris: some of the tools have weird behaviour, use portable ones
	PATH=/usr/xpg4/bin:$PATH
	export PATH
fi

nl='
'
safeIFS='	'
safeIFS=" $safeIFS$nl"
IFS=$safeIFS
allu=QWERTYUIOPASDFGHJKLZXCVBNM
alll=qwertyuiopasdfghjklzxcvbnm
alln=0123456789
alls=______________________________________________________________

genopt_die() {
	if test -n "$1"; then
		echo >&2 "E: $*"
		echo >&2 "E: in '$srcfile': '$line'"
	else
		echo >&2 "E: invalid input in '$srcfile': '$line'"
	fi
	rm -f "$bn.gen"
	exit 1
}

genopt_soptc() {
	optc=`echo "$line" | sed 's/^[<>]\(.\).*$/\1/'`
	test x"$optc" = x'|' && return
	optclo=`echo "$optc" | tr $allu $alll`
	if test x"$optc" = x"$optclo"; then
		islo=1
	else
		islo=0
	fi
	sym=`echo "$line" | sed 's/^[<>]/|/'`
	o_str=$o_str$nl"<$optclo$islo$sym"
}

genopt_scond() {
	case x$cond in
	x)
		cond=
		;;
	x*' '*)
		cond=`echo "$cond" | sed 's/^ //'`
		cond="#if $cond"
		;;
	x'!'*)
		cond=`echo "$cond" | sed 's/^!//'`
		cond="#ifndef $cond"
		;;
	x*)
		cond="#ifdef $cond"
		;;
	esac
}

do_genopt() {
	srcfile=$1
	test -f "$srcfile" || genopt_die Source file \$srcfile not set.
	bn=`basename "$srcfile" | sed 's/.opt$//'`
	o_hdr='/* +++ GENERATED FILE +++ DO NOT EDIT +++ */'
	o_gen=
	o_str=
	o_sym=
	ddefs=
	state=0
	exec <"$srcfile"
	IFS=
	while IFS= read line; do
		IFS=$safeIFS
		case $state:$line in
		2:'|'*)
			# end of input
			o_sym=`echo "$line" | sed 's/^.//'`
			o_gen=$o_gen$nl"#undef F0"
			o_gen=$o_gen$nl"#undef FN"
			o_gen=$o_gen$ddefs
			state=3
			;;
		1:@@)
			# start of data block
			o_gen=$o_gen$nl"#endif"
			o_gen=$o_gen$nl"#ifndef F0"
			o_gen=$o_gen$nl"#define F0 FN"
			o_gen=$o_gen$nl"#endif"
			state=2
			;;
		*:@@*)
			genopt_die ;;
		0:/\*-|0:\ \**|0:)
			o_hdr=$o_hdr$nl$line
			;;
		0:@*|1:@*)
			# start of a definition block
			sym=`echo "$line" | sed 's/^@//'`
			if test $state = 0; then
				o_gen=$o_gen$nl"#if defined($sym)"
			else
				o_gen=$o_gen$nl"#elif defined($sym)"
			fi
			ddefs="$ddefs$nl#undef $sym"
			state=1
			;;
		0:*|3:*)
			genopt_die ;;
		1:*)
			# definition line
			o_gen=$o_gen$nl$line
			;;
		2:'<'*'|'*)
			genopt_soptc
			;;
		2:'>'*'|'*)
			genopt_soptc
			cond=`echo "$line" | sed 's/^[^|]*|//'`
			genopt_scond
			case $optc in
			'|') optc=0 ;;
			*) optc=\'$optc\' ;;
			esac
			IFS= read line || genopt_die Unexpected EOF
			IFS=$safeIFS
			test -n "$cond" && o_gen=$o_gen$nl"$cond"
			o_gen=$o_gen$nl"$line, $optc)"
			test -n "$cond" && o_gen=$o_gen$nl"#endif"
			;;
		esac
	done
	case $state:$o_sym in
	3:) genopt_die Expected optc sym at EOF ;;
	3:*) ;;
	*) genopt_die Missing EOF marker ;;
	esac
	echo "$o_str" | sort | while IFS='|' read x opts cond; do
		IFS=$safeIFS
		test -n "$x" || continue
		genopt_scond
		test -n "$cond" && echo "$cond"
		echo "\"$opts\""
		test -n "$cond" && echo "#endif"
	done | {
		echo "$o_hdr"
		echo "#ifndef $o_sym$o_gen"
		echo "#else"
		cat
		echo "#undef $o_sym"
		echo "#endif"
	} >"$bn.gen"
	IFS=$safeIFS
	return 0
}

if test x"$BUILDSH_RUN_GENOPT" = x"1"; then
	set x -G "$srcfile"
	shift
fi
if test x"$1" = x"-G"; then
	do_genopt "$2"
	exit $?
fi

echo "For the build logs, demonstrate that /dev/null and /dev/tty exist:"
ls -l /dev/null /dev/tty

v() {
	$e "$*"
	eval "$@"
}

vv() {
	_c=$1
	shift
	$e "\$ $*" 2>&1
	eval "$@" >vv.out 2>&1
	sed "s^${_c} " <vv.out
}

vq() {
	eval "$@"
}

rmf() {
	for _f in "$@"; do
		case $_f in
		Build.sh|check.pl|check.t|dot.mkshrc|*.1|*.c|*.h|*.ico|*.opt) ;;
		*) rm -f "$_f" ;;
		esac
	done
}

tcfn=no
bi=
ui=
ao=
fx=
me=`basename "$0"`
orig_CFLAGS=$CFLAGS
phase=x
oldish_ed=stdout-ed,no-stderr-ed

if test -t 1; then
	bi='[1m'
	ui='[4m'
	ao='[0m'
fi

upper() {
	echo :"$@" | sed 's/^://' | tr $alll $allu
}

# clean up after ac_testrun()
ac_testdone() {
	eval HAVE_$fu=$fv
	fr=no
	test 0 = $fv || fr=yes
	$e "$bi==> $fd...$ao $ui$fr$ao$fx"
	fx=
}

# ac_cache label: sets f, fu, fv?=0
ac_cache() {
	f=$1
	fu=`upper $f`
	eval fv=\$HAVE_$fu
	case $fv in
	0|1)
		fx=' (cached)'
		return 0
		;;
	esac
	fv=0
	return 1
}

# ac_testinit label [!] checkif[!]0 [setlabelifcheckis[!]0] useroutput
# returns 1 if value was cached/implied, 0 otherwise: call ac_testdone
ac_testinit() {
	if ac_cache $1; then
		test x"$2" = x"!" && shift
		test x"$2" = x"" || shift
		fd=${3-$f}
		ac_testdone
		return 1
	fi
	fc=0
	if test x"$2" = x""; then
		ft=1
	else
		if test x"$2" = x"!"; then
			fc=1
			shift
		fi
		eval ft=\$HAVE_`upper $2`
		shift
	fi
	fd=${3-$f}
	if test $fc = "$ft"; then
		fv=$2
		fx=' (implied)'
		ac_testdone
		return 1
	fi
	$e ... $fd
	return 0
}

# pipe .c | ac_test[n] [!] label [!] checkif[!]0 [setlabelifcheckis[!]0] useroutput
ac_testnnd() {
	if test x"$1" = x"!"; then
		fr=1
		shift
	else
		fr=0
	fi
	ac_testinit "$@" || return 1
	cat >conftest.c
	vv ']' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN conftest.c $LIBS $ccpr"
	test $tcfn = no && test -f a.out && tcfn=a.out
	test $tcfn = no && test -f a.exe && tcfn=a.exe
	test $tcfn = no && test -f conftest.exe && tcfn=conftest.exe
	test $tcfn = no && test -f conftest && tcfn=conftest
	if test -f $tcfn; then
		test 1 = $fr || fv=1
	else
		test 0 = $fr || fv=1
	fi
	vscan=
	if test $phase = u; then
		test $ct = gcc && vscan='unrecogni[sz]ed'
		test $ct = hpcc && vscan='unsupported'
		test $ct = pcc && vscan='unsupported'
		test $ct = sunpro && vscan='-e ignored -e turned.off'
	fi
	test -n "$vscan" && grep $vscan vv.out >/dev/null 2>&1 && fv=$fr
	return 0
}
ac_testn() {
	ac_testnnd "$@" || return
	rmf conftest.c conftest.o ${tcfn}* vv.out
	ac_testdone
}

# ac_ifcpp cppexpr [!] label [!] checkif[!]0 [setlabelifcheckis[!]0] useroutput
ac_ifcpp() {
	expr=$1; shift
	ac_testn "$@" <<-EOF
		#include <unistd.h>
		extern int thiswillneverbedefinedIhope(void);
		int main(void) { return (isatty(0) +
		#$expr
		    0
		#else
		/* force a failure: expr is false */
		    thiswillneverbedefinedIhope()
		#endif
		    ); }
EOF
	test x"$1" = x"!" && shift
	f=$1
	fu=`upper $f`
	eval fv=\$HAVE_$fu
	test x"$fv" = x"1"
}

add_cppflags() {
	CPPFLAGS="$CPPFLAGS $*"
}

ac_cppflags() {
	test x"$1" = x"" || fu=$1
	fv=$2
	test x"$2" = x"" && eval fv=\$HAVE_$fu
	add_cppflags -DHAVE_$fu=$fv
}

ac_test() {
	ac_testn "$@"
	ac_cppflags
}

# ac_flags [-] add varname cflags [text] [ldflags]
ac_flags() {
	if test x"$1" = x"-"; then
		shift
		hf=1
	else
		hf=0
	fi
	fa=$1
	vn=$2
	f=$3
	ft=$4
	fl=$5
	test x"$ft" = x"" && ft="if $f can be used"
	save_CFLAGS=$CFLAGS
	CFLAGS="$CFLAGS $f"
	if test -n "$fl"; then
		save_LDFLAGS=$LDFLAGS
		LDFLAGS="$LDFLAGS $fl"
	fi
	if test 1 = $hf; then
		ac_testn can_$vn '' "$ft"
	else
		ac_testn can_$vn '' "$ft" <<-'EOF'
			/* evil apo'stroph in comment test */
			#include <unistd.h>
			int main(void) { return (isatty(0)); }
		EOF
	fi
	eval fv=\$HAVE_CAN_`upper $vn`
	if test -n "$fl"; then
		test 11 = $fa$fv || LDFLAGS=$save_LDFLAGS
	fi
	test 11 = $fa$fv || CFLAGS=$save_CFLAGS
}

# ac_header [!] header [prereq ...]
ac_header() {
	if test x"$1" = x"!"; then
		na=1
		shift
	else
		na=0
	fi
	hf=$1; shift
	hv=`echo "$hf" | tr -d '\012\015' | tr -c $alll$allu$alln $alls`
	echo "/* NeXTstep bug workaround */" >x
	for i
	do
		case $i in
		_time)
			echo '#if HAVE_BOTH_TIME_H' >>x
			echo '#include <sys/time.h>' >>x
			echo '#include <time.h>' >>x
			echo '#elif HAVE_SYS_TIME_H' >>x
			echo '#include <sys/time.h>' >>x
			echo '#elif HAVE_TIME_H' >>x
			echo '#include <time.h>' >>x
			echo '#endif' >>x
			;;
		*)
			echo "#include <$i>" >>x
			;;
		esac
	done
	echo "#include <$hf>" >>x
	echo '#include <unistd.h>' >>x
	echo 'int main(void) { return (isatty(0)); }' >>x
	ac_testn "$hv" "" "<$hf>" <x
	rmf x
	test 1 = $na || ac_cppflags
}

addsrcs() {
	if test x"$1" = x"!"; then
		fr=0
		shift
	else
		fr=1
	fi
	eval i=\$$1
	test $fr = "$i" && case " $SRCS " in
	*\ $2\ *)	;;
	*)		SRCS="$SRCS $2" ;;
	esac
}


curdir=`pwd` srcdir=`dirname "$0" 2>/dev/null`
case x$srcdir in
x)
	srcdir=.
	;;
*\ *|*"	"*|*"$nl"*)
	echo >&2 Source directory should not contain space or tab or newline.
	echo >&2 Errors may occur.
	;;
*"'"*)
	echo Source directory must not contain single quotes.
	exit 1
	;;
esac
dstversion=`sed -n '/define MKSH_VERSION/s/^.*"\([^"]*\)".*$/\1/p' "$srcdir/sh.h"`
add_cppflags -DMKSH_BUILDSH

e=echo
r=0
eq=0
pm=0
cm=normal
optflags=-std-compile-opts
check_categories=
last=
tfn=
legacy=0

for i
do
	case $last:$i in
	c:combine|c:dragonegg|c:llvm|c:lto)
		cm=$i
		last=
		;;
	c:*)
		echo "$me: Unknown option -c '$i'!" >&2
		exit 1
		;;
	o:*)
		optflags=$i
		last=
		;;
	t:*)
		tfn=$i
		last=
		;;
	:-c)
		last=c
		;;
	:-G)
		echo "$me: Do not call me with '-G'!" >&2
		exit 1
		;;
	:-g)
		# checker, debug, valgrind build
		add_cppflags -DDEBUG
		CFLAGS="$CFLAGS -g3 -fno-builtin"
		;;
	:-j)
		pm=1
		;;
	:-L)
		legacy=1
		;;
	:+L)
		legacy=0
		;;
	:-M)
		cm=makefile
		;;
	:-O)
		optflags=-std-compile-opts
		;;
	:-o)
		last=o
		;;
	:-Q)
		eq=1
		;;
	:-r)
		r=1
		;;
	:-t)
		last=t
		;;
	:-v)
		echo "Build.sh $srcversion"
		echo "for mksh $dstversion"
		exit 0
		;;
	:*)
		echo "$me: Unknown option '$i'!" >&2
		exit 1
		;;
	*)
		echo "$me: Unknown option -'$last' '$i'!" >&2
		exit 1
		;;
	esac
done
if test -n "$last"; then
	echo "$me: Option -'$last' not followed by argument!" >&2
	exit 1
fi

test -z "$tfn" && if test $legacy = 0; then
	tfn=mksh
else
	tfn=lksh
fi
if test -d $tfn || test -d $tfn.exe; then
	echo "$me: Error: ./$tfn is a directory!" >&2
	exit 1
fi
rmf a.exe* a.out* conftest.c conftest.exe* *core core.* ${tfn}* *.bc *.dbg \
    *.ll *.o *.gen *.cat1 Rebuild.sh lft no signames.inc test.sh x vv.out

SRCS="lalloc.c eval.c exec.c expr.c funcs.c histrap.c jobs.c"
SRCS="$SRCS lex.c main.c misc.c shf.c syn.c tree.c var.c"

if test $legacy = 0; then
	SRCS="$SRCS edit.c"
	check_categories="$check_categories shell:legacy-no int:32"
else
	check_categories="$check_categories shell:legacy-yes"
	add_cppflags -DMKSH_LEGACY_MODE
	HAVE_PERSISTENT_HISTORY=0
fi

if test x"$srcdir" = x"."; then
	CPPFLAGS="-I. $CPPFLAGS"
else
	CPPFLAGS="-I. -I'$srcdir' $CPPFLAGS"
fi
test -n "$LDSTATIC" && if test -n "$LDFLAGS"; then
	LDFLAGS="$LDFLAGS $LDSTATIC"
else
	LDFLAGS=$LDSTATIC
fi

if test -z "$TARGET_OS"; then
	x=`uname -s 2>/dev/null || uname`
	test x"$x" = x"`uname -n 2>/dev/null`" || TARGET_OS=$x
fi
if test -z "$TARGET_OS"; then
	echo "$me: Set TARGET_OS, your uname is broken!" >&2
	exit 1
fi
oswarn=
ccpc=-Wc,
ccpl=-Wl,
tsts=
ccpr='|| for _f in ${tcfn}*; do case $_f in Build.sh|check.pl|check.t|dot.mkshrc|*.1|*.c|*.h|*.ico|*.opt) ;; *) rm -f "$_f" ;; esac; done'

# Evil hack
if test x"$TARGET_OS" = x"Android"; then
	check_categories="$check_categories android"
	TARGET_OS=Linux
fi

# Evil OS
if test x"$TARGET_OS" = x"Minix"; then
	echo >&2 "
WARNING: additional checks before running Build.sh required!
You can avoid these by calling Build.sh correctly, see below.
"
	cat >conftest.c <<'EOF'
#include <sys/types.h>
const char *
#ifdef _NETBSD_SOURCE
ct="Ninix3"
#else
ct="Minix3"
#endif
;
EOF
	ct=unknown
	vv ']' "${CC-cc} -E $CFLAGS $CPPFLAGS $NOWARN conftest.c | grep ct= | tr -d \\\\015 >x"
	sed 's/^/[ /' x
	eval `cat x`
	rmf x vv.out
	case $ct in
	Minix3|Ninix3)
		echo >&2 "
Warning: you set TARGET_OS to $TARGET_OS but that is ambiguous.
Please set it to either Minix3 or Ninix3, whereas the latter is
all versions of Minix with even partial NetBSD(R) userland. The
value determined from your compiler for the current compilation
(which may be wrong) is: $ct
"
		TARGET_OS=$ct
		;;
	*)
		echo >&2 "
Warning: you set TARGET_OS to $TARGET_OS but that is ambiguous.
Please set it to either Minix3 or Ninix3, whereas the latter is
all versions of Minix with even partial NetBSD(R) userland. The
proper value couldn't be determined, continue at your own risk.
"
		;;
	esac
fi

# Configuration depending on OS revision, on OSes that need them
case $TARGET_OS in
NEXTSTEP)
	test x"$TARGET_OSREV" = x"" && TARGET_OSREV=`hostinfo 2>&1 | \
	    grep 'NeXT Mach [0-9][0-9.]*:' | \
	    sed 's/^.*NeXT Mach \([0-9][0-9.]*\):.*$/\1/'`
	;;
QNX|SCO_SV)
	test x"$TARGET_OSREV" = x"" && TARGET_OSREV=`uname -r`
	;;
esac

# Configuration depending on OS name
case $TARGET_OS in
386BSD)
	: "${HAVE_CAN_OTWO=0}"
	add_cppflags -DMKSH_NO_SIGSETJMP
	add_cppflags -DMKSH_TYPEDEF_SIG_ATOMIC_T=int
	;;
AIX)
	add_cppflags -D_ALL_SOURCE
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
BeOS)
	case $KSH_VERSION in
	*MIRBSD\ KSH*)
		oswarn="; it has minor issues"
		;;
	*)
		oswarn="; you must recompile mksh with"
		oswarn="$oswarn${nl}itself in a second stage"
		;;
	esac
	# BeOS has no real tty either
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_DISABLE_TTY_WARNING
	# BeOS doesn't have different UIDs and GIDs
	add_cppflags -DMKSH__NO_SETEUGID
	;;
BSD/OS)
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
Coherent)
	oswarn="; it has major issues"
	add_cppflags -DMKSH__NO_SYMLINK
	check_categories="$check_categories nosymlink"
	add_cppflags -DMKSH__NO_SETEUGID
	add_cppflags -DMKSH_DISABLE_TTY_WARNING
	;;
CYGWIN*)
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
Darwin)
	add_cppflags -D_DARWIN_C_SOURCE
	;;
DragonFly)
	;;
FreeBSD)
	;;
FreeMiNT)
	oswarn="; it has minor issues"
	add_cppflags -D_GNU_SOURCE
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
GNU)
	case $CC in
	*tendracc*) ;;
	*) add_cppflags -D_GNU_SOURCE ;;
	esac
	add_cppflags -DSETUID_CAN_FAIL_WITH_EAGAIN
	# define MKSH__NO_PATH_MAX to use Hurd-only functions
	add_cppflags -DMKSH__NO_PATH_MAX
	;;
GNU/kFreeBSD)
	case $CC in
	*tendracc*) ;;
	*) add_cppflags -D_GNU_SOURCE ;;
	esac
	add_cppflags -DSETUID_CAN_FAIL_WITH_EAGAIN
	;;
Haiku)
	add_cppflags -DMKSH_ASSUME_UTF8; HAVE_ISSET_MKSH_ASSUME_UTF8=1
	;;
Harvey)
	add_cppflags -D_POSIX_SOURCE
	add_cppflags -D_LIMITS_EXTENSION
	add_cppflags -D_BSD_EXTENSION
	add_cppflags -D_SUSV2_SOURCE
	add_cppflags -D_GNU_SOURCE
	add_cppflags -DMKSH_ASSUME_UTF8; HAVE_ISSET_MKSH_ASSUME_UTF8=1
	add_cppflags -DMKSH_NO_CMDLINE_EDITING
	add_cppflags -DMKSH__NO_SETEUGID
	oswarn=' and will currently not work'
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_NOPROSPECTOFWORK
	# these taken from Harvey-OS github and need re-checking
	add_cppflags -D_setjmp=setjmp -D_longjmp=longjmp
	: "${HAVE_CAN_NO_EH_FRAME=0}"
	: "${HAVE_CAN_FNOSTRICTALIASING=0}"
	: "${HAVE_CAN_FSTACKPROTECTORSTRONG=0}"
	;;
HP-UX)
	;;
Interix)
	ccpc='-X '
	ccpl='-Y '
	add_cppflags -D_ALL_SOURCE
	: "${LIBS=-lcrypt}"
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
IRIX*)
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
Linux)
	case $CC in
	*tendracc*) ;;
	*) add_cppflags -D_GNU_SOURCE ;;
	esac
	add_cppflags -DSETUID_CAN_FAIL_WITH_EAGAIN
	: "${HAVE_REVOKE=0}"
	;;
LynxOS)
	oswarn="; it has minor issues"
	;;
MidnightBSD)
	;;
Minix-vmd)
	add_cppflags -DMKSH__NO_SETEUGID
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -D_MINIX_SOURCE
	oldish_ed=no-stderr-ed		# no /bin/ed, maybe see below
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
Minix3)
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_NO_LIMITS
	add_cppflags -D_POSIX_SOURCE -D_POSIX_1_SOURCE=2 -D_MINIX
	oldish_ed=no-stderr-ed		# /usr/bin/ed(!) is broken
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
MirBSD)
	;;
MSYS_*)
	add_cppflags -DMKSH_ASSUME_UTF8=0; HAVE_ISSET_MKSH_ASSUME_UTF8=1
	# almost same as CYGWIN* (from RT|Chatzilla)
	: "${HAVE_SETLOCALE_CTYPE=0}"
	# broken on this OE (from ir0nh34d)
	: "${HAVE_STDINT_H=0}"
	;;
NetBSD)
	;;
NEXTSTEP)
	add_cppflags -D_NEXT_SOURCE
	add_cppflags -D_POSIX_SOURCE
	: "${AWK=gawk}"
	: "${CC=cc -posix}"
	add_cppflags -DMKSH_NO_SIGSETJMP
	# NeXTstep cannot get a controlling tty
	add_cppflags -DMKSH_UNEMPLOYED
	case $TARGET_OSREV in
	4.2*)
		# OpenStep 4.2 is broken by default
		oswarn="; it needs libposix.a"
		;;
	esac
	;;
Ninix3)
	# similar to Minix3
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_NO_LIMITS
	# but no idea what else could be needed
	oswarn="; it has unknown issues"
	;;
OpenBSD)
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
OS/2)
	HAVE_TERMIOS_H=0
	HAVE_MKNOD=0	# setmode() incompatible
	oswarn="; it is currently being ported, get it from"
	oswarn="$oswarn${nl}https://github.com/komh/mksh-os2 in the meanwhile"
	check_categories="$check_categories nosymlink"
	: "${CC=gcc}"
	: "${SIZE=: size}"
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_NOPROSPECTOFWORK
	add_cppflags -DMKSH_NO_LIMITS
	;;
OSF1)
	HAVE_SIG_T=0	# incompatible
	add_cppflags -D_OSF_SOURCE
	add_cppflags -D_POSIX_C_SOURCE=200112L
	add_cppflags -D_XOPEN_SOURCE=600
	add_cppflags -D_XOPEN_SOURCE_EXTENDED
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
Plan9)
	add_cppflags -D_POSIX_SOURCE
	add_cppflags -D_LIMITS_EXTENSION
	add_cppflags -D_BSD_EXTENSION
	add_cppflags -D_SUSV2_SOURCE
	add_cppflags -DMKSH_ASSUME_UTF8; HAVE_ISSET_MKSH_ASSUME_UTF8=1
	add_cppflags -DMKSH_NO_CMDLINE_EDITING
	add_cppflags -DMKSH__NO_SETEUGID
	oswarn=' and will currently not work'
	add_cppflags -DMKSH_UNEMPLOYED
	# this is for detecting kencc
	add_cppflags -DMKSH_MAYBE_KENCC
	;;
PW32*)
	HAVE_SIG_T=0	# incompatible
	oswarn=' and will currently not work'
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
QNX)
	add_cppflags -D__NO_EXT_QNX
	add_cppflags -D__EXT_UNIX_MISC
	case $TARGET_OSREV in
	[012345].*|6.[0123].*|6.4.[01])
		oldish_ed=no-stderr-ed		# oldish /bin/ed is broken
		;;
	esac
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
SCO_SV)
	case $TARGET_OSREV in
	3.2*)
		# SCO OpenServer 5
		add_cppflags -DMKSH_UNEMPLOYED
		;;
	5*)
		# SCO OpenServer 6
		;;
	*)
		oswarn='; this is an unknown version of'
		oswarn="$oswarn$nl$TARGET_OS ${TARGET_OSREV}, please tell me what to do"
		;;
	esac
	: "${HAVE_SYS_SIGLIST=0}${HAVE__SYS_SIGLIST=0}"
	;;
skyos)
	oswarn="; it has minor issues"
	;;
SunOS)
	add_cppflags -D_BSD_SOURCE
	add_cppflags -D__EXTENSIONS__
	;;
syllable)
	add_cppflags -D_GNU_SOURCE
	add_cppflags -DMKSH_NO_SIGSUSPEND
	oswarn=' and will currently not work'
	;;
ULTRIX)
	: "${CC=cc -YPOSIX}"
	add_cppflags -DMKSH_TYPEDEF_SSIZE_T=int
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
UnixWare|UNIX_SV)
	# SCO UnixWare
	: "${HAVE_SYS_SIGLIST=0}${HAVE__SYS_SIGLIST=0}"
	;;
UWIN*)
	ccpc='-Yc,'
	ccpl='-Yl,'
	tsts=" 3<>/dev/tty"
	oswarn="; it will compile, but the target"
	oswarn="$oswarn${nl}platform itself is very flakey/unreliable"
	: "${HAVE_SETLOCALE_CTYPE=0}"
	;;
_svr4)
	# generic target for SVR4 Unix with uname -s = uname -n
	# this duplicates the * target below
	oswarn='; it may or may not work'
	test x"$TARGET_OSREV" = x"" && TARGET_OSREV=`uname -r`
	;;
*)
	oswarn='; it may or may not work'
	test x"$TARGET_OSREV" = x"" && TARGET_OSREV=`uname -r`
	;;
esac

: "${HAVE_MKNOD=0}"

: "${AWK=awk}${CC=cc}${NROFF=nroff}${SIZE=size}"
test 0 = $r && echo | $NROFF -v 2>&1 | grep GNU >/dev/null 2>&1 && \
    echo | $NROFF -c >/dev/null 2>&1 && NROFF="$NROFF -c"

# this aids me in tracing FTBFSen without access to the buildd
$e "Hi from$ao $bi$srcversion$ao on:"
case $TARGET_OS in
AIX)
	vv '|' "oslevel >&2"
	vv '|' "uname -a >&2"
	;;
Darwin)
	vv '|' "hwprefs machine_type os_type os_class >&2"
	vv '|' "sw_vers >&2"
	vv '|' "system_profiler SPSoftwareDataType SPHardwareDataType >&2"
	vv '|' "/bin/sh --version >&2"
	vv '|' "xcodebuild -version >&2"
	vv '|' "uname -a >&2"
	vv '|' "sysctl kern.version hw.machine hw.model hw.memsize hw.availcpu hw.cpufrequency hw.byteorder hw.cpu64bit_capable >&2"
	;;
IRIX*)
	vv '|' "uname -a >&2"
	vv '|' "hinv -v >&2"
	;;
OSF1)
	vv '|' "uname -a >&2"
	vv '|' "/usr/sbin/sizer -v >&2"
	;;
SCO_SV|UnixWare|UNIX_SV)
	vv '|' "uname -a >&2"
	vv '|' "uname -X >&2"
	;;
*)
	vv '|' "uname -a >&2"
	;;
esac
test -z "$oswarn" || echo >&2 "
Warning: mksh has not yet been ported to or tested on your
operating system '$TARGET_OS'$oswarn. If you can provide
a shell account to the developer, this may improve; please
drop us a success or failure notice or even send in diffs.
"
$e "$bi$me: Building the MirBSD Korn Shell$ao $ui$dstversion$ao on $TARGET_OS ${TARGET_OSREV}..."

#
# Start of mirtoconf checks
#
$e $bi$me: Scanning for functions... please ignore any errors.$ao

#
# Compiler: which one?
#
# notes:
# - ICC defines __GNUC__ too
# - GCC defines __hpux too
# - LLVM+clang defines __GNUC__ too
# - nwcc defines __GNUC__ too
CPP="$CC -E"
$e ... which compiler seems to be used
cat >conftest.c <<'EOF'
const char *
#if defined(__ICC) || defined(__INTEL_COMPILER)
ct="icc"
#elif defined(__xlC__) || defined(__IBMC__)
ct="xlc"
#elif defined(__SUNPRO_C)
ct="sunpro"
#elif defined(__ACK__)
ct="ack"
#elif defined(__BORLANDC__)
ct="bcc"
#elif defined(__WATCOMC__)
ct="watcom"
#elif defined(__MWERKS__)
ct="metrowerks"
#elif defined(__HP_cc)
ct="hpcc"
#elif defined(__DECC) || (defined(__osf__) && !defined(__GNUC__))
ct="dec"
#elif defined(__PGI)
ct="pgi"
#elif defined(__DMC__)
ct="dmc"
#elif defined(_MSC_VER)
ct="msc"
#elif defined(__ADSPBLACKFIN__) || defined(__ADSPTS__) || defined(__ADSP21000__)
ct="adsp"
#elif defined(__IAR_SYSTEMS_ICC__)
ct="iar"
#elif defined(SDCC)
ct="sdcc"
#elif defined(__PCC__)
ct="pcc"
#elif defined(__TenDRA__)
ct="tendra"
#elif defined(__TINYC__)
ct="tcc"
#elif defined(__llvm__) && defined(__clang__)
ct="clang"
#elif defined(__NWCC__)
ct="nwcc"
#elif defined(__GNUC__)
ct="gcc"
#elif defined(_COMPILER_VERSION)
ct="mipspro"
#elif defined(__sgi)
ct="mipspro"
#elif defined(__hpux) || defined(__hpua)
ct="hpcc"
#elif defined(__ultrix)
ct="ucode"
#elif defined(__USLC__)
ct="uslc"
#elif defined(__LCC__)
ct="lcc"
#elif defined(MKSH_MAYBE_KENCC)
/* and none of the above matches */
ct="kencc"
#else
ct="unknown"
#endif
;
const char *
#if defined(__KLIBC__) && !defined(__OS2__)
et="klibc"
#else
et="unknown"
#endif
;
EOF
ct=untested
et=untested
vv ']' "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c | \
    sed -n '/^ *[ce]t *= */s/^ *\([ce]t\) *= */\1=/p' | tr -d \\\\015 >x"
sed 's/^/[ /' x
eval `cat x`
rmf x vv.out
cat >conftest.c <<'EOF'
#include <unistd.h>
int main(void) { return (isatty(0)); }
EOF
case $ct in
ack)
	# work around "the famous ACK const bug"
	CPPFLAGS="-Dconst= $CPPFLAGS"
	;;
adsp)
	echo >&2 'Warning: Analog Devices C++ compiler for Blackfin, TigerSHARC
    and SHARC (21000) DSPs detected. This compiler has not yet
    been tested for compatibility with mksh. Continue at your
    own risk, please report success/failure to the developers.'
	;;
bcc)
	echo >&2 "Warning: Borland C++ Builder detected. This compiler might
    produce broken executables. Continue at your own risk,
    please report success/failure to the developers."
	;;
clang)
	# does not work with current "ccc" compiler driver
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -version"
	# one of these two works, for now
	vv '|' "${CLANG-clang} -version"
	vv '|' "${CLANG-clang} --version"
	# ensure compiler and linker are in sync unless overridden
	case $CCC_CC:$CCC_LD in
	:*)	;;
	*:)	CCC_LD=$CCC_CC; export CCC_LD ;;
	esac
	: "${HAVE_STRING_POOLING=i1}"
	;;
dec)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -V"
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -Wl,-V conftest.c $LIBS"
	;;
dmc)
	echo >&2 "Warning: Digital Mars Compiler detected. When running under"
	echo >&2 "    UWIN, mksh tends to be unstable due to the limitations"
	echo >&2 "    of this platform. Continue at your own risk,"
	echo >&2 "    please report success/failure to the developers."
	;;
gcc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -v conftest.c $LIBS"
	vv '|' 'echo `$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS \
	    -dumpmachine` gcc`$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN \
	    $LIBS -dumpversion`'
	: "${HAVE_STRING_POOLING=i2}"
	;;
hpcc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -V conftest.c $LIBS"
	;;
iar)
	echo >&2 'Warning: IAR Systems (http://www.iar.com) compiler for embedded
    systems detected. This unsupported compiler has not yet
    been tested for compatibility with mksh. Continue at your
    own risk, please report success/failure to the developers.'
	;;
icc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -V"
	;;
kencc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -v conftest.c $LIBS"
	;;
lcc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -v conftest.c $LIBS"
	add_cppflags -D__inline__=__inline
	;;
metrowerks)
	echo >&2 'Warning: Metrowerks C compiler detected. This has not yet
    been tested for compatibility with mksh. Continue at your
    own risk, please report success/failure to the developers.'
	;;
mipspro)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -version"
	;;
msc)
	ccpr=		# errorlevels are not reliable
	case $TARGET_OS in
	Interix)
		if [[ -n $C89_COMPILER ]]; then
			C89_COMPILER=`ntpath2posix -c "$C89_COMPILER"`
		else
			C89_COMPILER=CL.EXE
		fi
		if [[ -n $C89_LINKER ]]; then
			C89_LINKER=`ntpath2posix -c "$C89_LINKER"`
		else
			C89_LINKER=LINK.EXE
		fi
		vv '|' "$C89_COMPILER /HELP >&2"
		vv '|' "$C89_LINKER /LINK >&2"
		;;
	esac
	;;
nwcc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -version"
	;;
pcc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -v"
	;;
pgi)
	echo >&2 'Warning: PGI detected. This unknown compiler has not yet
    been tested for compatibility with mksh. Continue at your
    own risk, please report success/failure to the developers.'
	;;
sdcc)
	echo >&2 'Warning: sdcc (http://sdcc.sourceforge.net), the small devices
    C compiler for embedded systems detected. This has not yet
    been tested for compatibility with mksh. Continue at your
    own risk, please report success/failure to the developers.'
	;;
sunpro)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -V conftest.c $LIBS"
	;;
tcc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -v"
	;;
tendra)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -V 2>&1 | \
	    grep -F -i -e version -e release"
	;;
ucode)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -V"
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -Wl,-V conftest.c $LIBS"
	;;
uslc)
	case $TARGET_OS:$TARGET_OSREV in
	SCO_SV:3.2*)
		# SCO OpenServer 5
		CFLAGS="$CFLAGS -g"
		: "${HAVE_CAN_OTWO=0}${HAVE_CAN_OPTIMISE=0}"
		;;
	esac
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -V conftest.c $LIBS"
	;;
watcom)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -v conftest.c $LIBS"
	;;
xlc)
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -qversion"
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN $LIBS -qversion=verbose"
	vv '|' "ld -V"
	;;
*)
	test x"$ct" = x"untested" && $e "!!! detecting preprocessor failed"
	ct=unknown
	vv "$CC --version"
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -v conftest.c $LIBS"
	vv '|' "$CC $CFLAGS $CPPFLAGS $LDFLAGS $NOWARN -V conftest.c $LIBS"
	;;
esac
case $cm in
dragonegg|llvm)
	vv '|' "llc -version"
	;;
esac
etd=" on $et"
case $et in
klibc)
	add_cppflags -DMKSH_NO_LIMITS
	;;
unknown)
	# nothing special detected, don’t worry
	etd=
	;;
*)
	# huh?
	;;
esac
$e "$bi==> which compiler seems to be used...$ao $ui$ct$etd$ao"
rmf conftest.c conftest.o conftest a.out* a.exe* conftest.exe* vv.out

#
# Compiler: works as-is, with -Wno-error and -Werror
#
save_NOWARN=$NOWARN
NOWARN=
DOWARN=
ac_flags 0 compiler_works '' 'if the compiler works'
test 1 = $HAVE_CAN_COMPILER_WORKS || exit 1
HAVE_COMPILER_KNOWN=0
test $ct = unknown || HAVE_COMPILER_KNOWN=1
if ac_ifcpp 'if 0' compiler_fails '' \
    'if the compiler does not fail correctly'; then
	save_CFLAGS=$CFLAGS
	: "${HAVE_CAN_DELEXE=x}"
	case $ct in
	dec)
		CFLAGS="$CFLAGS ${ccpl}-non_shared"
		ac_testn can_delexe compiler_fails 0 'for the -non_shared linker option' <<-EOF
			#include <unistd.h>
			int main(void) { return (isatty(0)); }
		EOF
		;;
	dmc)
		CFLAGS="$CFLAGS ${ccpl}/DELEXECUTABLE"
		ac_testn can_delexe compiler_fails 0 'for the /DELEXECUTABLE linker option' <<-EOF
			#include <unistd.h>
			int main(void) { return (isatty(0)); }
		EOF
		;;
	*)
		exit 1
		;;
	esac
	test 1 = $HAVE_CAN_DELEXE || CFLAGS=$save_CFLAGS
	ac_testn compiler_still_fails '' 'if the compiler still does not fail correctly' <<-EOF
	EOF
	test 1 = $HAVE_COMPILER_STILL_FAILS && exit 1
fi
if ac_ifcpp 'ifdef __TINYC__' couldbe_tcc '!' compiler_known 0 \
    'if this could be tcc'; then
	ct=tcc
	CPP='cpp -D__TINYC__'
	HAVE_COMPILER_KNOWN=1
fi

case $ct in
bcc)
	save_NOWARN="${ccpc}-w"
	DOWARN="${ccpc}-w!"
	;;
dec)
	# -msg_* flags not used yet, or is -w2 correct?
	;;
dmc)
	save_NOWARN="${ccpc}-w"
	DOWARN="${ccpc}-wx"
	;;
hpcc)
	save_NOWARN=
	DOWARN=+We
	;;
kencc)
	save_NOWARN=
	DOWARN=
	;;
mipspro)
	save_NOWARN=
	DOWARN="-diag_error 1-10000"
	;;
msc)
	save_NOWARN="${ccpc}/w"
	DOWARN="${ccpc}/WX"
	;;
sunpro)
	test x"$save_NOWARN" = x"" && save_NOWARN='-errwarn=%none'
	ac_flags 0 errwarnnone "$save_NOWARN"
	test 1 = $HAVE_CAN_ERRWARNNONE || save_NOWARN=
	ac_flags 0 errwarnall "-errwarn=%all"
	test 1 = $HAVE_CAN_ERRWARNALL && DOWARN="-errwarn=%all"
	;;
tendra)
	save_NOWARN=-w
	;;
ucode)
	save_NOWARN=
	DOWARN=-w2
	;;
watcom)
	save_NOWARN=
	DOWARN=-Wc,-we
	;;
xlc)
	save_NOWARN=-qflag=i:e
	DOWARN=-qflag=i:i
	;;
*)
	test x"$save_NOWARN" = x"" && save_NOWARN=-Wno-error
	ac_flags 0 wnoerror "$save_NOWARN"
	test 1 = $HAVE_CAN_WNOERROR || save_NOWARN=
	ac_flags 0 werror -Werror
	test 1 = $HAVE_CAN_WERROR && DOWARN=-Werror
	test $ct = icc && DOWARN="$DOWARN -wd1419"
	;;
esac
NOWARN=$save_NOWARN

#
# Compiler: extra flags (-O2 -f* -W* etc.)
#
i=`echo :"$orig_CFLAGS" | sed 's/^://' | tr -c -d $alll$allu$alln`
# optimisation: only if orig_CFLAGS is empty
test x"$i" = x"" && case $ct in
hpcc)
	phase=u
	ac_flags 1 otwo +O2
	phase=x
	;;
kencc|tcc|tendra)
	# no special optimisation
	;;
sunpro)
	cat >x <<-'EOF'
		#include <unistd.h>
		int main(void) { return (isatty(0)); }
		#define __IDSTRING_CONCAT(l,p)	__LINTED__ ## l ## _ ## p
		#define __IDSTRING_EXPAND(l,p)	__IDSTRING_CONCAT(l,p)
		#define pad			void __IDSTRING_EXPAND(__LINE__,x)(void) { }
	EOF
	yes pad | head -n 256 >>x
	ac_flags - 1 otwo -xO2 <x
	rmf x
	;;
xlc)
	ac_flags 1 othree "-O3 -qstrict"
	test 1 = $HAVE_CAN_OTHREE || ac_flags 1 otwo -O2
	;;
*)
	ac_flags 1 otwo -O2
	test 1 = $HAVE_CAN_OTWO || ac_flags 1 optimise -O
	;;
esac
# other flags: just add them if they are supported
i=0
case $ct in
bcc)
	ac_flags 1 strpool "${ccpc}-d" 'if string pooling can be enabled'
	;;
clang)
	i=1
	;;
dec)
	ac_flags 0 verb -verbose
	ac_flags 1 rodata -readonly_strings
	;;
dmc)
	ac_flags 1 decl "${ccpc}-r" 'for strict prototype checks'
	ac_flags 1 schk "${ccpc}-s" 'for stack overflow checking'
	;;
gcc)
	# The following tests run with -Werror (gcc only) if possible
	NOWARN=$DOWARN; phase=u
	ac_flags 1 wnodeprecateddecls -Wno-deprecated-declarations
	# mksh is not written in CFrustFrust!
	ac_flags 1 no_eh_frame -fno-asynchronous-unwind-tables
	ac_flags 1 fnostrictaliasing -fno-strict-aliasing
	ac_flags 1 fstackprotectorstrong -fstack-protector-strong
	test 1 = $HAVE_CAN_FSTACKPROTECTORSTRONG || \
	    ac_flags 1 fstackprotectorall -fstack-protector-all
	test $cm = dragonegg && case " $CC $CFLAGS $LDFLAGS " in
	*\ -fplugin=*dragonegg*) ;;
	*) ac_flags 1 fplugin_dragonegg -fplugin=dragonegg ;;
	esac
	case $cm in
	combine)
		fv=0
		checks='7 8'
		;;
	lto)
		fv=0
		checks='1 2 3 4 5 6 7 8'
		;;
	*)
		fv=1
		;;
	esac
	test $fv = 1 || for what in $checks; do
		test $fv = 1 && break
		case $what in
		1)	t_cflags='-flto=jobserver'
			t_ldflags='-fuse-linker-plugin'
			t_use=1 t_name=fltojs_lp ;;
		2)	t_cflags='-flto=jobserver' t_ldflags=''
			t_use=1 t_name=fltojs_nn ;;
		3)	t_cflags='-flto=jobserver'
			t_ldflags='-fno-use-linker-plugin -fwhole-program'
			t_use=1 t_name=fltojs_np ;;
		4)	t_cflags='-flto'
			t_ldflags='-fuse-linker-plugin'
			t_use=1 t_name=fltons_lp ;;
		5)	t_cflags='-flto' t_ldflags=''
			t_use=1 t_name=fltons_nn ;;
		6)	t_cflags='-flto'
			t_ldflags='-fno-use-linker-plugin -fwhole-program'
			t_use=1 t_name=fltons_np ;;
		7)	t_cflags='-fwhole-program --combine' t_ldflags=''
			t_use=0 t_name=combine cm=combine ;;
		8)	fv=1 cm=normal ;;
		esac
		test $fv = 1 && break
		ac_flags $t_use $t_name "$t_cflags" \
		    "if gcc supports $t_cflags $t_ldflags" "$t_ldflags"
	done
	ac_flags 1 data_abi_align -malign-data=abi
	i=1
	;;
hpcc)
	phase=u
	# probably not needed
	#ac_flags 1 agcc -Agcc 'for support of GCC extensions'
	phase=x
	;;
icc)
	ac_flags 1 fnobuiltinsetmode -fno-builtin-setmode
	ac_flags 1 fnostrictaliasing -fno-strict-aliasing
	ac_flags 1 fstacksecuritycheck -fstack-security-check
	i=1
	;;
mipspro)
	ac_flags 1 fullwarn -fullwarn 'for remark output support'
	;;
msc)
	ac_flags 1 strpool "${ccpc}/GF" 'if string pooling can be enabled'
	echo 'int main(void) { char test[64] = ""; return (*test); }' >x
	ac_flags - 1 stackon "${ccpc}/GZ" 'if stack checks can be enabled' <x
	ac_flags - 1 stckall "${ccpc}/Ge" 'stack checks for all functions' <x
	ac_flags - 1 secuchk "${ccpc}/GS" 'for compiler security checks' <x
	rmf x
	ac_flags 1 wall "${ccpc}/Wall" 'to enable all warnings'
	ac_flags 1 wp64 "${ccpc}/Wp64" 'to enable 64-bit warnings'
	;;
nwcc)
	#broken# ac_flags 1 ssp -stackprotect
	i=1
	;;
pcc)
	ac_flags 1 fstackprotectorall -fstack-protector-all
	i=1
	;;
sunpro)
	phase=u
	ac_flags 1 v -v
	ac_flags 1 ipo -xipo 'for cross-module optimisation'
	phase=x
	;;
tcc)
	: #broken# ac_flags 1 boundschk -b
	;;
tendra)
	ac_flags 0 ysystem -Ysystem
	test 1 = $HAVE_CAN_YSYSTEM && CPPFLAGS="-Ysystem $CPPFLAGS"
	ac_flags 1 extansi -Xa
	;;
xlc)
	ac_flags 1 rodata "-qro -qroconst -qroptr"
	ac_flags 1 rtcheck -qcheck=all
	#ac_flags 1 rtchkc -qextchk	# reported broken
	ac_flags 1 wformat "-qformat=all -qformat=nozln"
	#ac_flags 1 wp64 -qwarn64	# too verbose for now
	;;
esac
# flags common to a subset of compilers (run with -Werror on gcc)
if test 1 = $i; then
	ac_flags 1 wall -Wall
	ac_flags 1 fwrapv -fwrapv
fi

# “on demand” means: GCC version >= 4
fd='if to rely on compiler for string pooling'
ac_cache string_pooling || case $HAVE_STRING_POOLING in
2) fx=' (on demand, cached)' ;;
i1) fv=1 ;;
i2) fv=2; fx=' (on demand)' ;;
esac
ac_testdone
test x"$HAVE_STRING_POOLING" = x"0" || ac_cppflags

phase=x
# The following tests run with -Werror or similar (all compilers) if possible
NOWARN=$DOWARN
test $ct = pcc && phase=u

#
# Compiler: check for stuff that only generates warnings
#
ac_test attribute_bounded '' 'for __attribute__((__bounded__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	extern int thiswillneverbedefinedIhope(void);
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	#include <string.h>
	#undef __attribute__
	int xcopy(const void *, void *, size_t)
	    __attribute__((__bounded__(__buffer__, 1, 3)))
	    __attribute__((__bounded__(__buffer__, 2, 3)));
	int main(int ac, char *av[]) { return (xcopy(av[0], av[--ac], 1)); }
	int xcopy(const void *s, void *d, size_t n) {
		/*
		 * if memmove does not exist, we are not on a system
		 * with GCC with __bounded__ attribute either so poo
		 */
		memmove(d, s, n); return ((int)n);
	}
	#endif
EOF
ac_test attribute_format '' 'for __attribute__((__format__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	extern int thiswillneverbedefinedIhope(void);
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	#define fprintf printfoo
	#include <stdio.h>
	#undef __attribute__
	#undef fprintf
	extern int fprintf(FILE *, const char *format, ...)
	    __attribute__((__format__(__printf__, 2, 3)));
	int main(int ac, char **av) { return (fprintf(stderr, "%s%d", *av, ac)); }
	#endif
EOF
ac_test attribute_noreturn '' 'for __attribute__((__noreturn__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	extern int thiswillneverbedefinedIhope(void);
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	#include <stdlib.h>
	#undef __attribute__
	void fnord(void) __attribute__((__noreturn__));
	int main(void) { fnord(); }
	void fnord(void) { exit(0); }
	#endif
EOF
ac_test attribute_pure '' 'for __attribute__((__pure__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	extern int thiswillneverbedefinedIhope(void);
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	#include <unistd.h>
	#undef __attribute__
	int foo(const char *) __attribute__((__pure__));
	int main(int ac, char **av) { return (foo(av[ac - 1]) + isatty(0)); }
	int foo(const char *s) { return ((int)s[0]); }
	#endif
EOF
ac_test attribute_unused '' 'for __attribute__((__unused__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	extern int thiswillneverbedefinedIhope(void);
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	#include <unistd.h>
	#undef __attribute__
	int main(int ac __attribute__((__unused__)), char **av
	    __attribute__((__unused__))) { return (isatty(0)); }
	#endif
EOF
ac_test attribute_used '' 'for __attribute__((__used__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	extern int thiswillneverbedefinedIhope(void);
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	#include <unistd.h>
	#undef __attribute__
	static const char fnord[] __attribute__((__used__)) = "42";
	int main(void) { return (isatty(0)); }
	#endif
EOF

# End of tests run with -Werror
NOWARN=$save_NOWARN
phase=x

#
# mksh: flavours (full/small mksh, omit certain stuff)
#
if ac_ifcpp 'ifdef MKSH_SMALL' isset_MKSH_SMALL '' \
    "if a reduced-feature mksh is requested"; then
	: "${HAVE_NICE=0}"
	: "${HAVE_PERSISTENT_HISTORY=0}"
	check_categories="$check_categories smksh"
fi
ac_ifcpp 'if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)' \
    isset_MKSH_BINSH '' 'if invoking as sh should be handled specially' && \
    check_categories="$check_categories binsh"
ac_ifcpp 'ifdef MKSH_UNEMPLOYED' isset_MKSH_UNEMPLOYED '' \
    "if mksh will be built without job control" && \
    check_categories="$check_categories arge"
ac_ifcpp 'ifdef MKSH_NOPROSPECTOFWORK' isset_MKSH_NOPROSPECTOFWORK '' \
    "if mksh will be built without job signals" && \
    check_categories="$check_categories arge nojsig"
ac_ifcpp 'ifdef MKSH_ASSUME_UTF8' isset_MKSH_ASSUME_UTF8 '' \
    'if the default UTF-8 mode is specified' && : "${HAVE_SETLOCALE_CTYPE=0}"
#ac_ifcpp 'ifdef MKSH_DISABLE_DEPRECATED' isset_MKSH_DISABLE_DEPRECATED '' \
#    "if deprecated features are to be omitted" && \
#    check_categories="$check_categories nodeprecated"
#ac_ifcpp 'ifdef MKSH_DISABLE_EXPERIMENTAL' isset_MKSH_DISABLE_EXPERIMENTAL '' \
#    "if experimental features are to be omitted" && \
#    check_categories="$check_categories noexperimental"
ac_ifcpp 'ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT' isset_MKSH_MIDNIGHTBSD01ASH_COMPAT '' \
    'if the MidnightBSD 0.1 ash compatibility mode is requested' && \
    check_categories="$check_categories mnbsdash"

#
# Environment: headers
#
ac_header sys/time.h sys/types.h
ac_header time.h sys/types.h
test "11" = "$HAVE_SYS_TIME_H$HAVE_TIME_H" || HAVE_BOTH_TIME_H=0
ac_test both_time_h '' 'whether <sys/time.h> and <time.h> can both be included' <<-'EOF'
	#include <sys/types.h>
	#include <sys/time.h>
	#include <time.h>
	#include <unistd.h>
	int main(void) { struct tm tm; return ((int)sizeof(tm) + isatty(0)); }
EOF
ac_header sys/bsdtypes.h
ac_header sys/file.h sys/types.h
ac_header sys/mkdev.h sys/types.h
ac_header sys/mman.h sys/types.h
ac_header sys/param.h
ac_header sys/resource.h sys/types.h _time
ac_header sys/select.h sys/types.h
ac_header sys/sysmacros.h
ac_header bstring.h
ac_header grp.h sys/types.h
ac_header io.h
ac_header libgen.h
ac_header libutil.h sys/types.h
ac_header paths.h
ac_header stdint.h stdarg.h
# include strings.h only if compatible with string.h
ac_header strings.h sys/types.h string.h
ac_header termios.h
ac_header ulimit.h sys/types.h
ac_header values.h

#
# Environment: definitions
#
echo '#include <sys/types.h>
#include <unistd.h>
/* check that off_t can represent 2^63-1 correctly, thx FSF */
#define LARGE_OFF_T ((((off_t)1 << 31) << 31) - 1 + (((off_t)1 << 31) << 31))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721 &&
    LARGE_OFF_T % 2147483647 == 1) ? 1 : -1];
int main(void) { return (isatty(0)); }' >lft.c
ac_testn can_lfs '' "for large file support" <lft.c
save_CPPFLAGS=$CPPFLAGS
add_cppflags -D_FILE_OFFSET_BITS=64
ac_testn can_lfs_sus '!' can_lfs 0 "... with -D_FILE_OFFSET_BITS=64" <lft.c
if test 0 = $HAVE_CAN_LFS_SUS; then
	CPPFLAGS=$save_CPPFLAGS
	add_cppflags -D_LARGE_FILES=1
	ac_testn can_lfs_aix '!' can_lfs 0 "... with -D_LARGE_FILES=1" <lft.c
	test 1 = $HAVE_CAN_LFS_AIX || CPPFLAGS=$save_CPPFLAGS
fi
rm -f lft.c
rmf lft*	# end of large file support test

#
# Environment: types
#
ac_test can_inttypes '!' stdint_h 1 "for standard 32-bit integer types" <<-'EOF'
	#include <sys/types.h>
	#include <stddef.h>
	int main(int ac, char **av) { return ((uint32_t)(size_t)*av + (int32_t)ac); }
EOF
ac_test can_ucbints '!' can_inttypes 1 "for UCB 32-bit integer types" <<-'EOF'
	#include <sys/types.h>
	#include <stddef.h>
	int main(int ac, char **av) { return ((u_int32_t)(size_t)*av + (int32_t)ac); }
EOF
ac_test can_int8type '!' stdint_h 1 "for standard 8-bit integer type" <<-'EOF'
	#include <sys/types.h>
	#include <stddef.h>
	int main(int ac, char **av) { return ((uint8_t)(size_t)av[ac]); }
EOF
ac_test can_ucbint8 '!' can_int8type 1 "for UCB 8-bit integer type" <<-'EOF'
	#include <sys/types.h>
	#include <stddef.h>
	int main(int ac, char **av) { return ((u_int8_t)(size_t)av[ac]); }
EOF

ac_test rlim_t <<-'EOF'
	#include <sys/types.h>
	#if HAVE_BOTH_TIME_H
	#include <sys/time.h>
	#include <time.h>
	#elif HAVE_SYS_TIME_H
	#include <sys/time.h>
	#elif HAVE_TIME_H
	#include <time.h>
	#endif
	#if HAVE_SYS_RESOURCE_H
	#include <sys/resource.h>
	#endif
	#include <unistd.h>
	int main(void) { return (((int)(rlim_t)0) + isatty(0)); }
EOF

# only testn: added later below
ac_testn sig_t <<-'EOF'
	#include <sys/types.h>
	#include <signal.h>
	#include <stddef.h>
	volatile sig_t foo = (sig_t)0;
	int main(void) { return (foo == (sig_t)0); }
EOF

ac_testn sighandler_t '!' sig_t 0 <<-'EOF'
	#include <sys/types.h>
	#include <signal.h>
	#include <stddef.h>
	volatile sighandler_t foo = (sighandler_t)0;
	int main(void) { return (foo == (sighandler_t)0); }
EOF
if test 1 = $HAVE_SIGHANDLER_T; then
	add_cppflags -Dsig_t=sighandler_t
	HAVE_SIG_T=1
fi

ac_testn __sighandler_t '!' sig_t 0 <<-'EOF'
	#include <sys/types.h>
	#include <signal.h>
	#include <stddef.h>
	volatile __sighandler_t foo = (__sighandler_t)0;
	int main(void) { return (foo == (__sighandler_t)0); }
EOF
if test 1 = $HAVE___SIGHANDLER_T; then
	add_cppflags -Dsig_t=__sighandler_t
	HAVE_SIG_T=1
fi

test 1 = $HAVE_SIG_T || add_cppflags -Dsig_t=nosig_t
ac_cppflags SIG_T

#
# check whether whatever we use for the final link will succeed
#
if test $cm = makefile; then
	: nothing to check
else
	HAVE_LINK_WORKS=x
	ac_testinit link_works '' 'checking if the final link command may succeed'
	fv=1
	cat >conftest.c <<-EOF
		#define EXTERN
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		__RCSID("$srcversion");
		int main(void) { printf("Hello, World!\\n"); return (isatty(0)); }
EOF
	case $cm in
	llvm)
		v "$CC $CFLAGS $CPPFLAGS $NOWARN -emit-llvm -c conftest.c" || fv=0
		rmf $tfn.s
		test $fv = 0 || v "llvm-link -o - conftest.o | opt $optflags | llc -o $tfn.s" || fv=0
		test $fv = 0 || v "$CC $CFLAGS $LDFLAGS -o $tcfn $tfn.s $LIBS $ccpr"
		;;
	dragonegg)
		v "$CC $CFLAGS $CPPFLAGS $NOWARN -S -flto conftest.c" || fv=0
		test $fv = 0 || v "mv conftest.s conftest.ll"
		test $fv = 0 || v "llvm-as conftest.ll" || fv=0
		rmf $tfn.s
		test $fv = 0 || v "llvm-link -o - conftest.bc | opt $optflags | llc -o $tfn.s" || fv=0
		test $fv = 0 || v "$CC $CFLAGS $LDFLAGS -o $tcfn $tfn.s $LIBS $ccpr"
		;;
	combine)
		v "$CC $CFLAGS $CPPFLAGS $LDFLAGS -fwhole-program --combine $NOWARN -o $tcfn conftest.c $LIBS $ccpr"
		;;
	lto|normal)
		cm=normal
		v "$CC $CFLAGS $CPPFLAGS $NOWARN -c conftest.c" || fv=0
		test $fv = 0 || v "$CC $CFLAGS $LDFLAGS -o $tcfn conftest.o $LIBS $ccpr"
		;;
	esac
	test -f $tcfn || fv=0
	ac_testdone
	test $fv = 1 || exit 1
fi

#
# Environment: errors and signals
#
test x"NetBSD" = x"$TARGET_OS" && $e Ignore the compatibility warning.

ac_testn sys_errlist '' "the sys_errlist[] array and sys_nerr" <<-'EOF'
	extern const int sys_nerr;
	extern const char * const sys_errlist[];
	extern int isatty(int);
	int main(void) { return (*sys_errlist[sys_nerr - 1] + isatty(0)); }
EOF
ac_testn _sys_errlist '!' sys_errlist 0 "the _sys_errlist[] array and _sys_nerr" <<-'EOF'
	extern const int _sys_nerr;
	extern const char * const _sys_errlist[];
	extern int isatty(int);
	int main(void) { return (*_sys_errlist[_sys_nerr - 1] + isatty(0)); }
EOF
if test 1 = "$HAVE__SYS_ERRLIST"; then
	add_cppflags -Dsys_nerr=_sys_nerr
	add_cppflags -Dsys_errlist=_sys_errlist
	HAVE_SYS_ERRLIST=1
fi
ac_cppflags SYS_ERRLIST

for what in name list; do
	uwhat=`upper $what`
	ac_testn sys_sig$what '' "the sys_sig${what}[] array" <<-EOF
		extern const char * const sys_sig${what}[];
		extern int isatty(int);
		int main(void) { return (sys_sig${what}[0][0] + isatty(0)); }
	EOF
	ac_testn _sys_sig$what '!' sys_sig$what 0 "the _sys_sig${what}[] array" <<-EOF
		extern const char * const _sys_sig${what}[];
		extern int isatty(int);
		int main(void) { return (_sys_sig${what}[0][0] + isatty(0)); }
	EOF
	eval uwhat_v=\$HAVE__SYS_SIG$uwhat
	if test 1 = "$uwhat_v"; then
		add_cppflags -Dsys_sig$what=_sys_sig$what
		eval HAVE_SYS_SIG$uwhat=1
	fi
	ac_cppflags SYS_SIG$uwhat
done

#
# Environment: library functions
#
ac_test flock <<-'EOF'
	#include <sys/types.h>
	#include <fcntl.h>
	#undef flock
	#if HAVE_SYS_FILE_H
	#include <sys/file.h>
	#endif
	int main(void) { return (flock(0, LOCK_EX | LOCK_UN)); }
EOF

ac_test lock_fcntl '!' flock 1 'whether we can lock files with fcntl' <<-'EOF'
	#include <fcntl.h>
	#undef flock
	int main(void) {
		struct flock lks;
		lks.l_type = F_WRLCK | F_UNLCK;
		return (fcntl(0, F_SETLKW, &lks));
	}
EOF

ac_test getrusage <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	int main(void) {
		struct rusage ru;
		return (getrusage(RUSAGE_SELF, &ru) +
		    getrusage(RUSAGE_CHILDREN, &ru));
	}
EOF

ac_test getsid <<-'EOF'
	#include <unistd.h>
	int main(void) { return ((int)getsid(0)); }
EOF

ac_test gettimeofday <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	int main(void) { struct timeval tv; return (gettimeofday(&tv, NULL)); }
EOF

ac_test killpg <<-'EOF'
	#include <signal.h>
	int main(int ac, char *av[]) { return (av[0][killpg(123, ac)]); }
EOF

ac_test memmove <<-'EOF'
	#include <sys/types.h>
	#include <stddef.h>
	#include <string.h>
	#if HAVE_STRINGS_H
	#include <strings.h>
	#endif
	int main(int ac, char *av[]) {
		return (*(int *)(void *)memmove(av[0], av[1], (size_t)ac));
	}
EOF

ac_test mknod '' 'if to use mknod(), makedev() and friends' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	int main(int ac, char *av[]) {
		dev_t dv;
		dv = makedev((unsigned int)ac, (unsigned int)av[0][0]);
		return (mknod(av[0], (mode_t)0, dv) ? (int)major(dv) :
		    (int)minor(dv));
	}
EOF

ac_test mmap lock_fcntl 0 'for mmap and munmap' <<-'EOF'
	#include <sys/types.h>
	#if HAVE_SYS_FILE_H
	#include <sys/file.h>
	#endif
	#if HAVE_SYS_MMAN_H
	#include <sys/mman.h>
	#endif
	#include <stddef.h>
	#include <stdlib.h>
	int main(void) { return ((void *)mmap(NULL, (size_t)0,
	    PROT_READ, MAP_PRIVATE, 0, (off_t)0) == (void *)NULL ? 1 :
	    munmap(NULL, 0)); }
EOF

ac_test nice <<-'EOF'
	#include <unistd.h>
	int main(void) { return (nice(4)); }
EOF

ac_test revoke <<-'EOF'
	#include <sys/types.h>
	#if HAVE_LIBUTIL_H
	#include <libutil.h>
	#endif
	#include <unistd.h>
	int main(int ac, char *av[]) { return (ac + revoke(av[0])); }
EOF

ac_test setlocale_ctype '' 'setlocale(LC_CTYPE, "")' <<-'EOF'
	#include <locale.h>
	#include <stddef.h>
	int main(void) { return ((int)(size_t)(void *)setlocale(LC_CTYPE, "")); }
EOF

ac_test langinfo_codeset setlocale_ctype 0 'nl_langinfo(CODESET)' <<-'EOF'
	#include <langinfo.h>
	#include <stddef.h>
	int main(void) { return ((int)(size_t)(void *)nl_langinfo(CODESET)); }
EOF

ac_test select <<-'EOF'
	#include <sys/types.h>
	#if HAVE_BOTH_TIME_H
	#include <sys/time.h>
	#include <time.h>
	#elif HAVE_SYS_TIME_H
	#include <sys/time.h>
	#elif HAVE_TIME_H
	#include <time.h>
	#endif
	#if HAVE_SYS_BSDTYPES_H
	#include <sys/bsdtypes.h>
	#endif
	#if HAVE_SYS_SELECT_H
	#include <sys/select.h>
	#endif
	#if HAVE_BSTRING_H
	#include <bstring.h>
	#endif
	#include <stddef.h>
	#include <stdlib.h>
	#include <string.h>
	#if HAVE_STRINGS_H
	#include <strings.h>
	#endif
	#include <unistd.h>
	int main(void) {
		struct timeval tv = { 1, 200000 };
		fd_set fds; FD_ZERO(&fds); FD_SET(0, &fds);
		return (select(FD_SETSIZE, &fds, NULL, NULL, &tv));
	}
EOF

ac_test setresugid <<-'EOF'
	#include <sys/types.h>
	#include <unistd.h>
	int main(void) { return (setresuid(0,0,0) + setresgid(0,0,0)); }
EOF

ac_test setgroups setresugid 0 <<-'EOF'
	#include <sys/types.h>
	#if HAVE_GRP_H
	#include <grp.h>
	#endif
	#include <unistd.h>
	int main(void) { gid_t gid = 0; return (setgroups(0, &gid)); }
EOF

if test x"$et" = x"klibc"; then

	ac_testn __rt_sigsuspend '' 'whether klibc uses RT signals' <<-'EOF'
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		extern int __rt_sigsuspend(const sigset_t *, size_t);
		int main(void) { return (__rt_sigsuspend(NULL, 0)); }
EOF

	# no? damn! legacy crap ahead!

	ac_testn __sigsuspend_s '!' __rt_sigsuspend 1 \
	    'whether sigsuspend is usable (1/2)' <<-'EOF'
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		extern int __sigsuspend_s(sigset_t);
		int main(void) { return (__sigsuspend_s(0)); }
EOF
	ac_testn __sigsuspend_xxs '!' __sigsuspend_s 1 \
	    'whether sigsuspend is usable (2/2)' <<-'EOF'
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		extern int __sigsuspend_xxs(int, int, sigset_t);
		int main(void) { return (__sigsuspend_xxs(0, 0, 0)); }
EOF

	if test "000" = "$HAVE___RT_SIGSUSPEND$HAVE___SIGSUSPEND_S$HAVE___SIGSUSPEND_XXS"; then
		# no usable sigsuspend(), use pause() *ugh*
		add_cppflags -DMKSH_NO_SIGSUSPEND
	fi
fi

ac_test strerror '!' sys_errlist 0 <<-'EOF'
	extern char *strerror(int);
	int main(int ac, char *av[]) { return (*strerror(*av[ac])); }
EOF

ac_test strsignal '!' sys_siglist 0 <<-'EOF'
	#include <string.h>
	#include <signal.h>
	int main(void) { return (strsignal(1)[0]); }
EOF

ac_test strlcpy <<-'EOF'
	#include <string.h>
	int main(int ac, char *av[]) { return (strlcpy(*av, av[1],
	    (size_t)ac)); }
EOF

#
# check headers for declarations
#
ac_test flock_decl flock 1 'for declaration of flock()' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	#if HAVE_SYS_FILE_H
	#include <sys/file.h>
	#endif
	int main(void) { return ((flock)(0, 0)); }
EOF
ac_test revoke_decl revoke 1 'for declaration of revoke()' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	int main(void) { return ((revoke)("")); }
EOF
ac_test sys_errlist_decl sys_errlist 0 "for declaration of sys_errlist[] and sys_nerr" <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	int main(void) { return (*sys_errlist[sys_nerr - 1] + isatty(0)); }
EOF
ac_test sys_siglist_decl sys_siglist 0 'for declaration of sys_siglist[]' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	int main(void) { return (sys_siglist[0][0] + isatty(0)); }
EOF

#
# other checks
#
fd='if to use persistent history'
ac_cache PERSISTENT_HISTORY || case $HAVE_MMAP$HAVE_FLOCK$HAVE_LOCK_FCNTL in
11*|101) fv=1 ;;
esac
test 1 = $fv || check_categories="$check_categories no-histfile"
ac_testdone
ac_cppflags

save_CFLAGS=$CFLAGS
ac_testn compile_time_asserts_$$ '' 'whether compile-time assertions pass' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	#ifndef CHAR_BIT
	#define CHAR_BIT 8	/* defuse this test on really legacy systems */
	#endif
	struct ctasserts {
	#define cta(name, assertion) char name[(assertion) ? 1 : -1]
/* this one should be defined by the standard */
cta(char_is_1_char, (sizeof(char) == 1) && (sizeof(signed char) == 1) &&
    (sizeof(unsigned char) == 1));
cta(char_is_8_bits, ((CHAR_BIT) == 8) && ((int)(unsigned char)0xFF == 0xFF) &&
    ((int)(unsigned char)0x100 == 0) && ((int)(unsigned char)(int)-1 == 0xFF));
/* the next assertion is probably not really needed */
cta(short_is_2_char, sizeof(short) == 2);
cta(short_size_no_matter_of_signedness, sizeof(short) == sizeof(unsigned short));
/* the next assertion is probably not really needed */
cta(int_is_4_char, sizeof(int) == 4);
cta(int_size_no_matter_of_signedness, sizeof(int) == sizeof(unsigned int));

cta(long_ge_int, sizeof(long) >= sizeof(int));
cta(long_size_no_matter_of_signedness, sizeof(long) == sizeof(unsigned long));

#ifndef MKSH_LEGACY_MODE
/* the next assertion is probably not really needed */
cta(ari_is_4_char, sizeof(mksh_ari_t) == 4);
/* but this is */
cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1));
/* the next assertion is probably not really needed */
cta(uari_is_4_char, sizeof(mksh_uari_t) == 4);
/* but the next three are; we REQUIRE unsigned integer wraparound */
cta(uari_has_31_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 2 + 1));
cta(uari_has_32_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3));
cta(uari_wrap_32_bit,
    (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3) >
    (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 4));
#define NUM 22
#else
#define NUM 16
#endif
/* these are always required */
cta(ari_is_signed, (mksh_ari_t)-1 < (mksh_ari_t)0);
cta(uari_is_unsigned, (mksh_uari_t)-1 > (mksh_uari_t)0);
/* we require these to have the precisely same size and assume 2s complement */
cta(ari_size_no_matter_of_signedness, sizeof(mksh_ari_t) == sizeof(mksh_uari_t));

cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t));
cta(sizet_voidptr_same_size, sizeof(size_t) == sizeof(void *));
cta(sizet_funcptr_same_size, sizeof(size_t) == sizeof(void (*)(void)));
/* our formatting routines assume this */
cta(ptr_fits_in_long, sizeof(size_t) <= sizeof(long));
cta(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long));
/* for struct alignment people */
		char padding[64 - NUM];
	};
char ctasserts_dblcheck[sizeof(struct ctasserts) == 64 ? 1 : -1];
	int main(void) { return (sizeof(ctasserts_dblcheck) + isatty(0)); }
EOF
CFLAGS=$save_CFLAGS
eval test 1 = \$HAVE_COMPILE_TIME_ASSERTS_$$ || exit 1

#
# extra checks for legacy mksh
#
if test $legacy = 1; then
	ac_test long_32bit '' 'whether long is 32 bit wide' <<-'EOF'
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		#ifndef CHAR_BIT
		#define CHAR_BIT 0
		#endif
		struct ctasserts {
		#define cta(name, assertion) char name[(assertion) ? 1 : -1]
			cta(char_is_8_bits, (CHAR_BIT) == 8);
			cta(long_is_32_bits, sizeof(long) == 4);
		};
		int main(void) { return (sizeof(struct ctasserts)); }
EOF

	ac_test long_64bit '!' long_32bit 0 'whether long is 64 bit wide' <<-'EOF'
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		#ifndef CHAR_BIT
		#define CHAR_BIT 0
		#endif
		struct ctasserts {
		#define cta(name, assertion) char name[(assertion) ? 1 : -1]
			cta(char_is_8_bits, (CHAR_BIT) == 8);
			cta(long_is_64_bits, sizeof(long) == 8);
		};
		int main(void) { return (sizeof(struct ctasserts)); }
EOF

	case $HAVE_LONG_32BIT$HAVE_LONG_64BIT in
	10) check_categories="$check_categories int:32" ;;
	01) check_categories="$check_categories int:64" ;;
	*) check_categories="$check_categories int:u" ;;
	esac
fi

#
# Compiler: Praeprocessor (only if needed)
#
test 0 = $HAVE_SYS_SIGNAME && if ac_testinit cpp_dd '' \
    'checking if the C Preprocessor supports -dD'; then
	echo '#define foo bar' >conftest.c
	vv ']' "$CPP $CFLAGS $CPPFLAGS $NOWARN -dD conftest.c >x"
	grep '#define foo bar' x >/dev/null 2>&1 && fv=1
	rmf conftest.c x vv.out
	ac_testdone
fi

#
# End of mirtoconf checks
#
$e ... done.

# Some operating systems have ancient versions of ed(1) writing
# the character count to standard output; cope for that
echo wq >x
ed x <x 2>/dev/null | grep 3 >/dev/null 2>&1 && \
    check_categories="$check_categories $oldish_ed"
rmf x vv.out

if test 0 = $HAVE_SYS_SIGNAME; then
	if test 1 = $HAVE_CPP_DD; then
		$e Generating list of signal names...
	else
		$e No list of signal names available via cpp. Falling back...
	fi
	sigseenone=:
	sigseentwo=:
	echo '#include <signal.h>
#if defined(NSIG_MAX)
#define cfg_NSIG NSIG_MAX
#elif defined(NSIG)
#define cfg_NSIG NSIG
#elif defined(_NSIG)
#define cfg_NSIG _NSIG
#elif defined(SIGMAX)
#define cfg_NSIG (SIGMAX + 1)
#elif defined(_SIGMAX)
#define cfg_NSIG (_SIGMAX + 1)
#else
/*XXX better error out, see sh.h */
#define cfg_NSIG 64
#endif
int
mksh_cfg= cfg_NSIG
;' >conftest.c
	# GNU sed 2.03 segfaults when optimising this to sed -n
	NSIG=`vq "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c" | \
	    grep -v '^#' | \
	    sed '/mksh_cfg.*= *$/{
		N
		s/\n/ /
		}' | \
	    grep '^ *mksh_cfg *=' | \
	    sed 's/^ *mksh_cfg *=[	 ]*\([()0-9x+-][()0-9x+	 -]*\).*$/\1/'`
	case $NSIG in
	*mksh_cfg*) $e "Error: NSIG='$NSIG'"; NSIG=0 ;;
	*[\ \(\)+-]*) NSIG=`"$AWK" "BEGIN { print $NSIG }" </dev/null` ;;
	esac
	printf=printf
	(printf hallo) >/dev/null 2>&1 || printf=echo
	test $printf = echo || test "`printf %d 42`" = 42 || printf=echo
	test $printf = echo || NSIG=`printf %d "$NSIG" 2>/dev/null`
	$printf "NSIG=$NSIG ... "
	sigs="ABRT FPE ILL INT SEGV TERM ALRM BUS CHLD CONT HUP KILL PIPE QUIT"
	sigs="$sigs STOP TSTP TTIN TTOU USR1 USR2 POLL PROF SYS TRAP URG VTALRM"
	sigs="$sigs XCPU XFSZ INFO WINCH EMT IO DIL LOST PWR SAK CLD IOT STKFLT"
	sigs="$sigs ABND DCE DUMP IOERR TRACE DANGER THCONT THSTOP RESV UNUSED"
	test 1 = $HAVE_CPP_DD && test $NSIG -gt 1 && sigs="$sigs "`vq \
	    "$CPP $CFLAGS $CPPFLAGS $NOWARN -dD conftest.c" | \
	    grep '[	 ]SIG[A-Z0-9][A-Z0-9]*[	 ]' | \
	    sed 's/^.*[	 ]SIG\([A-Z0-9][A-Z0-9]*\)[	 ].*$/\1/' | sort`
	test $NSIG -gt 1 || sigs=
	for name in $sigs; do
		case $sigseenone in
		*:$name:*) continue ;;
		esac
		sigseenone=$sigseenone$name:
		echo '#include <signal.h>' >conftest.c
		echo int >>conftest.c
		echo mksh_cfg= SIG$name >>conftest.c
		echo ';' >>conftest.c
		# GNU sed 2.03 croaks on optimising this, too
		vq "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c" | \
		    grep -v '^#' | \
		    sed '/mksh_cfg.*= *$/{
			N
			s/\n/ /
			}' | \
		    grep '^ *mksh_cfg *=' | \
		    sed 's/^ *mksh_cfg *=[	 ]*\([0-9][0-9x]*\).*$/:\1 '$name/
	done | sed -n '/^:[^ ]/s/^://p' | while read nr name; do
		test $printf = echo || nr=`printf %d "$nr" 2>/dev/null`
		test $nr -gt 0 && test $nr -lt $NSIG || continue
		case $sigseentwo in
		*:$nr:*) ;;
		*)	echo "		{ \"$name\", $nr },"
			sigseentwo=$sigseentwo$nr:
			$printf "$name=$nr " >&2
			;;
		esac
	done 2>&1 >signames.inc
	rmf conftest.c
	$e done.
fi

addsrcs '!' HAVE_STRLCPY strlcpy.c
addsrcs USE_PRINTF_BUILTIN printf.c
test 1 = "$USE_PRINTF_BUILTIN" && add_cppflags -DMKSH_PRINTF_BUILTIN
test 1 = "$HAVE_CAN_VERB" && CFLAGS="$CFLAGS -verbose"
add_cppflags -DMKSH_BUILD_R=541

$e $bi$me: Finished configuration testing, now producing output.$ao

files=
objs=
sp=
case $tcfn in
a.exe|conftest.exe)
	mkshexe=$tfn.exe
	add_cppflags -DMKSH_EXE_EXT
	;;
*)
	mkshexe=$tfn
	;;
esac
case $curdir in
*\ *)	mkshshebang="#!./$mkshexe" ;;
*)	mkshshebang="#!$curdir/$mkshexe" ;;
esac
cat >test.sh <<-EOF
	$mkshshebang
	LC_ALL=C PATH='$PATH'; export LC_ALL PATH
	test -n "\$KSH_VERSION" || exit 1
	set -A check_categories -- $check_categories
	pflag='$curdir/$mkshexe'
	sflag='$srcdir/check.t'
	usee=0 Pflag=0 Sflag=0 uset=0 vflag=1 xflag=0
	while getopts "C:e:fPp:QSs:t:v" ch; do case \$ch {
	(C)	check_categories[\${#check_categories[*]}]=\$OPTARG ;;
	(e)	usee=1; eflag=\$OPTARG ;;
	(f)	check_categories[\${#check_categories[*]}]=fastbox ;;
	(P)	Pflag=1 ;;
	(+P)	Pflag=0 ;;
	(p)	pflag=\$OPTARG ;;
	(Q)	vflag=0 ;;
	(+Q)	vflag=1 ;;
	(S)	Sflag=1 ;;
	(+S)	Sflag=0 ;;
	(s)	sflag=\$OPTARG ;;
	(t)	uset=1; tflag=\$OPTARG ;;
	(v)	vflag=1 ;;
	(+v)	vflag=0 ;;
	(*)	xflag=1 ;;
	}
	done
	shift \$((OPTIND - 1))
	set -A args -- '$srcdir/check.pl' -p "\$pflag"
	x=
	for y in "\${check_categories[@]}"; do
		x=\$x,\$y
	done
	if [[ -n \$x ]]; then
		args[\${#args[*]}]=-C
		args[\${#args[*]}]=\${x#,}
	fi
	if (( usee )); then
		args[\${#args[*]}]=-e
		args[\${#args[*]}]=\$eflag
	fi
	(( Pflag )) && args[\${#args[*]}]=-P
	if (( uset )); then
		args[\${#args[*]}]=-t
		args[\${#args[*]}]=\$tflag
	fi
	(( vflag )) && args[\${#args[*]}]=-v
	(( xflag )) && args[\${#args[*]}]=-x	# force usage by synerr
	if [[ -n \$TMPDIR && -d \$TMPDIR/. ]]; then
		args[\${#args[*]}]=-T
		args[\${#args[*]}]=\$TMPDIR
	fi
	print Testing mksh for conformance:
	grep -F -e Mir''OS: -e MIRBSD "\$sflag"
	print "This shell is actually:\\n\\t\$KSH_VERSION"
	print 'test.sh built for mksh $dstversion'
	cstr='\$os = defined \$^O ? \$^O : "unknown";'
	cstr="\$cstr"'print \$os . ", Perl version " . \$];'
	for perli in \$PERL perl5 perl no; do
		if [[ \$perli = no ]]; then
			print Cannot find a working Perl interpreter, aborting.
			exit 1
		fi
		print "Trying Perl interpreter '\$perli'..."
		perlos=\$(\$perli -e "\$cstr")
		rv=\$?
		print "Errorlevel \$rv, running on '\$perlos'"
		if (( rv )); then
			print "=> not using"
			continue
		fi
		if [[ -n \$perlos ]]; then
			print "=> using it"
			break
		fi
	done
	(( Sflag )) || echo + \$perli "\${args[@]}" -s "\$sflag" "\$@"
	(( Sflag )) || exec \$perli "\${args[@]}" -s "\$sflag" "\$@"$tsts
	# use of the -S option for check.t split into multiple chunks
	rv=0
	for s in "\$sflag".*; do
		echo + \$perli "\${args[@]}" -s "\$s" "\$@"
		\$perli "\${args[@]}" -s "\$s" "\$@"$tsts
		rc=\$?
		(( rv = rv ? rv : rc ))
	done
	exit \$rv
EOF
chmod 755 test.sh
case $cm in
dragonegg)
	emitbc="-S -flto"
	;;
llvm)
	emitbc="-emit-llvm -c"
	;;
*)
	emitbc=-c
	;;
esac
echo ": # work around NeXTstep bug" >Rebuild.sh
cd "$srcdir"
optfiles=`echo *.opt`
cd "$curdir"
for file in $optfiles; do
	echo "echo + Running genopt on '$file'..."
	echo "(srcfile='$srcdir/$file'; BUILDSH_RUN_GENOPT=1; . '$srcdir/Build.sh')"
done >>Rebuild.sh
echo set -x >>Rebuild.sh
for file in $SRCS; do
	op=`echo x"$file" | sed 's/^x\(.*\)\.c$/\1./'`
	test -f $file || file=$srcdir/$file
	files="$files$sp$file"
	sp=' '
	echo "$CC $CFLAGS $CPPFLAGS $emitbc $file || exit 1" >>Rebuild.sh
	if test $cm = dragonegg; then
		echo "mv ${op}s ${op}ll" >>Rebuild.sh
		echo "llvm-as ${op}ll || exit 1" >>Rebuild.sh
		objs="$objs$sp${op}bc"
	else
		objs="$objs$sp${op}o"
	fi
done
case $cm in
dragonegg|llvm)
	echo "rm -f $tfn.s" >>Rebuild.sh
	echo "llvm-link -o - $objs | opt $optflags | llc -o $tfn.s" >>Rebuild.sh
	lobjs=$tfn.s
	;;
*)
	lobjs=$objs
	;;
esac
echo tcfn=$mkshexe >>Rebuild.sh
echo "$CC $CFLAGS $LDFLAGS -o \$tcfn $lobjs $LIBS $ccpr" >>Rebuild.sh
echo "test -f \$tcfn || exit 1; $SIZE \$tcfn" >>Rebuild.sh
if test $cm = makefile; then
	extras='emacsfn.h exprtok.h rlimits.opt sh.h sh_flags.opt var_spec.h'
	test 0 = $HAVE_SYS_SIGNAME && extras="$extras signames.inc"
	gens= genq=
	for file in $optfiles; do
		genf=`basename "$file" | sed 's/.opt$/.gen/'`
		gens="$gens $genf"
		genq="$genq$nl$genf: $srcdir/Build.sh $srcdir/$file
			srcfile=$srcdir/$file; BUILDSH_RUN_GENOPT=1; . $srcdir/Build.sh"
	done
	cat >Makefrag.inc <<EOF
# Makefile fragment for building mksh $dstversion

PROG=		$mkshexe
MAN=		mksh.1
SRCS=		$SRCS
SRCS_FP=	$files
OBJS_BP=	$objs
INDSRCS=	$extras
NONSRCS_INST=	dot.mkshrc \$(MAN)
NONSRCS_NOINST=	Build.sh Makefile Rebuild.sh check.pl check.t test.sh
CC=		$CC
CFLAGS=		$CFLAGS
CPPFLAGS=	$CPPFLAGS
LDFLAGS=	$LDFLAGS
LIBS=		$LIBS

.depend \$(OBJS_BP):$gens$genq

# not BSD make only:
#VPATH=		$srcdir
#all: \$(PROG)
#\$(PROG): \$(OBJS_BP)
#	\$(CC) \$(CFLAGS) \$(LDFLAGS) -o \$@ \$(OBJS_BP) \$(LIBS)
#\$(OBJS_BP): \$(SRCS_FP) \$(NONSRCS)
#.c.o:
#	\$(CC) \$(CFLAGS) \$(CPPFLAGS) -c \$<

# for all make variants:
#REGRESS_FLAGS=	-f
#regress:
#	./test.sh \$(REGRESS_FLAGS)
check_categories=$check_categories

# for BSD make only:
#.PATH: $srcdir
#.include <bsd.prog.mk>
EOF
	$e
	$e Generated Makefrag.inc successfully.
	exit 0
fi
for file in $optfiles; do
	$e "+ Running genopt on '$file'..."
	do_genopt "$srcdir/$file" || exit 1
done
if test $cm = combine; then
	objs="-o $mkshexe"
	for file in $SRCS; do
		test -f $file || file=$srcdir/$file
		objs="$objs $file"
	done
	emitbc="-fwhole-program --combine"
	v "$CC $CFLAGS $CPPFLAGS $LDFLAGS $emitbc $objs $LIBS $ccpr"
elif test 1 = $pm; then
	for file in $SRCS; do
		test -f $file || file=$srcdir/$file
		v "$CC $CFLAGS $CPPFLAGS $emitbc $file" &
	done
	wait
else
	for file in $SRCS; do
		test $cm = dragonegg && \
		    op=`echo x"$file" | sed 's/^x\(.*\)\.c$/\1./'`
		test -f $file || file=$srcdir/$file
		v "$CC $CFLAGS $CPPFLAGS $emitbc $file" || exit 1
		if test $cm = dragonegg; then
			v "mv ${op}s ${op}ll"
			v "llvm-as ${op}ll" || exit 1
		fi
	done
fi
case $cm in
dragonegg|llvm)
	rmf $tfn.s
	v "llvm-link -o - $objs | opt $optflags | llc -o $tfn.s"
	;;
esac
tcfn=$mkshexe
test $cm = combine || v "$CC $CFLAGS $LDFLAGS -o $tcfn $lobjs $LIBS $ccpr"
test -f $tcfn || exit 1
test 1 = $r || v "$NROFF -mdoc <'$srcdir/lksh.1' >lksh.cat1" || rmf lksh.cat1
test 1 = $r || v "$NROFF -mdoc <'$srcdir/mksh.1' >mksh.cat1" || rmf mksh.cat1
test 0 = $eq && v $SIZE $tcfn
i=install
test -f /usr/ucb/$i && i=/usr/ucb/$i
test 1 = $eq && e=:
$e
$e Installing the shell:
$e "# $i -c -s -o root -g bin -m 555 $tfn /bin/$tfn"
if test $legacy = 0; then
	$e "# grep -x /bin/$tfn /etc/shells >/dev/null || echo /bin/$tfn >>/etc/shells"
	$e "# $i -c -o root -g bin -m 444 dot.mkshrc /usr/share/doc/mksh/examples/"
fi
$e
$e Installing the manual:
if test -f mksh.cat1; then
	$e "# $i -c -o root -g bin -m 444 lksh.cat1" \
	    "/usr/share/man/cat1/lksh.0"
	$e "# $i -c -o root -g bin -m 444 mksh.cat1" \
	    "/usr/share/man/cat1/mksh.0"
	$e or
fi
$e "# $i -c -o root -g bin -m 444 lksh.1 mksh.1 /usr/share/man/man1/"
$e
$e Run the regression test suite: ./test.sh
$e Please also read the sample file dot.mkshrc and the fine manual.
exit 0

: <<'EOD'

=== Environment used ===

==== build environment ====
AWK				default: awk
CC				default: cc
CFLAGS				if empty, defaults to -xO2 or +O2
				or -O3 -qstrict or -O2, per compiler
CPPFLAGS			default empty
LDFLAGS				default empty; added before sources
LDSTATIC			set this to '-static'; default unset
LIBS				default empty; added after sources
				[Interix] default: -lcrypt (XXX still needed?)
NOWARN				-Wno-error or similar
NROFF				default: nroff
TARGET_OS			default: $(uname -s || uname)
TARGET_OSREV			[QNX] default: $(uname -r)

==== feature selectors ====
USE_PRINTF_BUILTIN		1 to include (unsupported) printf(1) as builtin
===== general format =====
HAVE_STRLEN			ac_test
HAVE_STRING_H			ac_header
HAVE_CAN_FSTACKPROTECTORALL	ac_flags

==== cpp definitions ====
DEBUG				dont use in production, wants gcc, implies:
DEBUG_LEAKS			enable freeing resources before exiting
MKSHRC_PATH			"~/.mkshrc" (do not change)
MKSH_A4PB			force use of arc4random_pushb
MKSH_ASSUME_UTF8		(0=disabled, 1=enabled; default: unset)
MKSH_BINSHPOSIX			if */sh or */-sh, enable set -o posix
MKSH_BINSHREDUCED		if */sh or */-sh, enable set -o sh
MKSH_CLS_STRING			"\033[;H\033[J"
MKSH_DEFAULT_EXECSHELL		"/bin/sh" (do not change)
MKSH_DEFAULT_PROFILEDIR		"/etc" (do not change)
MKSH_DEFAULT_TMPDIR		"/tmp" (do not change)
MKSH_DISABLE_DEPRECATED		disable code paths scheduled for later removal
MKSH_DISABLE_EXPERIMENTAL	disable code not yet comfy for (LTS) snapshots
MKSH_DISABLE_TTY_WARNING	shut up warning about ctty if OS cant be fixed
MKSH_DONT_EMIT_IDSTRING		omit RCS IDs from binary
MKSH_MIDNIGHTBSD01ASH_COMPAT	set -o sh: additional compatibility quirk
MKSH_NOPROSPECTOFWORK		disable jobs, co-processes, etc. (do not use)
MKSH_NOPWNAM			skip PAM calls, for -static on glibc or Solaris
MKSH_NO_CMDLINE_EDITING		disable command line editing code entirely
MKSH_NO_DEPRECATED_WARNING	omit warning when deprecated stuff is run
MKSH_NO_LIMITS			omit ulimit code
MKSH_NO_SIGSETJMP		define if sigsetjmp is broken or not available
MKSH_NO_SIGSUSPEND		use sigprocmask+pause instead of sigsuspend
MKSH_SMALL			omit some code, optimise hard for size (slower)
MKSH_SMALL_BUT_FAST		disable some hard-for-size optim. (modern sys.)
MKSH_S_NOVI=1			disable Vi editing mode (default if MKSH_SMALL)
MKSH_TYPEDEF_SIG_ATOMIC_T	define to e.g. 'int' if sig_atomic_t is missing
MKSH_TYPEDEF_SSIZE_T		define to e.g. 'long' if your OS has no ssize_t
MKSH_UNEMPLOYED			disable job control (but not jobs/co-processes)

=== generic installation instructions ===

Set CC and possibly CFLAGS, CPPFLAGS, LDFLAGS, LIBS. If cross-compiling,
also set TARGET_OS. To disable tests, set e.g. HAVE_STRLCPY=0; to enable
them, set to a value other than 0 or 1. Ensure /bin/ed is installed. For
MKSH_SMALL but with Vi mode, add -DMKSH_S_NOVI=0 to CPPFLAGS as well.

Normally, the following command is what you want to run, then:
$ (sh Build.sh -r -c lto && ./test.sh -f) 2>&1 | tee log

Copy dot.mkshrc to /etc/skel/.mkshrc; install mksh into $prefix/bin; or
/bin; install the manpage, if omitting the -r flag a catmanpage is made
using $NROFF. Consider using a forward script as /etc/skel/.mkshrc like
http://anonscm.debian.org/cgit/collab-maint/mksh.git/plain/debian/.mkshrc
and put dot.mkshrc as /etc/mkshrc so users need not keep up their HOME.

You may also want to install the lksh binary (also as /bin/sh) built by:
$ CPPFLAGS="$CPPFLAGS -DMKSH_BINSHPOSIX" sh Build.sh -L -r -c lto

EOD