mksh/Build.sh

#!/bin/sh
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.590 2012/11/20 18:50:41 tg Exp $'
#-
# Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
#		2011, 2012
#	Thorsten Glaser <tg@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

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 $_f in
		Build.sh|check.pl|check.t|dot.mkshrc|*.c|*.h|mksh.1) ;;
		*) rm -f "$_f" ;;
		esac
	done
}

allu=QWERTYUIOPASDFGHJKLZXCVBNM
alll=qwertyuiopasdfghjklzxcvbnm
alln=0123456789
alls=______________________________________________________________
nl='
'
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=''
	ui=''
	ao=''
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 && 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
		int main(void) { return (
		#$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 */
			int main(void) { return (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 $alls`
	echo "/* NeXTstep bug workaround */" >x
	for i
	do
		echo "#include <$i>" >>x
	done
	echo "#include <$hf>" >>x
	echo 'int main(void) { return (0); }' >>x
	ac_testn "$hv" "" "<$hf>" <x
	rmf x
	test 1 = $na || ac_cppflags
}

addsrcs() {
	addsrcs_s=0
	if test x"$1" = x"-s"; then
		# optstatic
		addsrcs_s=1
		shift
	fi
	if test x"$1" = x"!"; then
		fr=0
		shift
	else
		fr=1
	fi
	eval i=\$$1
	if test $addsrcs_s = 1; then
		if test -f "$2" || test -f "$srcdir/$2"; then
			# always add $2, since it exists
			fr=1
			i=1
		fi
	fi
	test $fr = "$i" && case " $SRCS " in
	*\ $2\ *)	;;
	*)		SRCS="$SRCS $2" ;;
	esac
}


curdir=`pwd` srcdir=`dirname "$0" 2>/dev/null` check_categories=
test -n "$srcdir" || srcdir=. # in case dirname does not exist
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
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=$i
		last=
		;;
	:-c)
		last=c
		;;
	:-g)
		# checker, debug, valgrind build
		add_cppflags -DDEBUG
		CFLAGS="$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 *core core.* lft ${tfn}* no *.bc *.ll *.o \
    Rebuild.sh 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
	HAVE_ISSET_MKSH_CONSERVATIVE_FDS=1	# from sh.h
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 $_f in Build.sh|check.pl|check.t|dot.mkshrc|*.c|*.h|mksh.1) ;; *) rm -f "$_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
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	;;
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_CONSERVATIVE_FDS
	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
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	: ${HAVE_SETLOCALE_CTYPE=0}
	;;
GNU)
	case $CC in
	*tendracc*) ;;
	*) add_cppflags -D_GNU_SOURCE ;;
	esac
	# 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
	;;
Haiku)
	add_cppflags -DMKSH_ASSUME_UTF8; HAVE_ISSET_MKSH_ASSUME_UTF8=1
	;;
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*) ;;
	*/musl-gcc*) add_cppflags -D_GNU_SOURCE -D_BSD_SOURCE ;;
	*) add_cppflags -D_GNU_SOURCE ;;
	esac
	add_cppflags -DSETUID_CAN_FAIL_WITH_EAGAIN
	: ${HAVE_REVOKE=0}
	;;
LynxOS)
	oswarn="; it has minor issues"
	;;
MidnightBSD)
	;;
Minix3)
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	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
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	;;
Ninix3)
	# similar to Minix3
	add_cppflags -DMKSH_UNEMPLOYED
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	add_cppflags -DMKSH_NO_LIMITS
	# but no idea what else could be needed
	oswarn="; it has unknown issues"
	;;
OpenBSD)
	: ${HAVE_SETLOCALE_CTYPE=0}
	;;
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
	oswarn=' and will currently not work'
	add_cppflags -DMKSH_UNEMPLOYED
	;;
PW32*)
	HAVE_SIG_T=0	# incompatible
	oswarn=' and will currently not work'
	: ${HAVE_SETLOCALE_CTYPE=0}
	;;
QNX)
	add_cppflags -D__NO_EXT_QNX
	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
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	: ${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
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	: ${HAVE_SETLOCALE_CTYPE=0}
	;;
UnixWare|UNIX_SV)
	# SCO UnixWare
	add_cppflags -DMKSH_CONSERVATIVE_FDS
	: ${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}
test 0 = $r && echo | $NROFF -v 2>&1 | grep GNU >/dev/null 2>&1 && \
    NROFF="$NROFF -c"

# this aids me in tracing FTBFSen without access to the buildd
$e "Hi from$ao $bi$srcversion$ao on:"
case $TARGET_OS in
AIX)
	vv '|' "oslevel >&2"
	vv '|' "uname -a >&2"
	;;
Darwin)
	vv '|' "hwprefs machine_type os_type os_class >&2"
	vv '|' "uname -a >&2"
	;;
IRIX*)
	vv '|' "uname -a >&2"
	vv '|' "hinv -v >&2"
	;;
OSF1)
	vv '|' "uname -a >&2"
	vv '|' "/usr/sbin/sizer -v >&2"
	;;
SCO_SV|UnixWare|UNIX_SV)
	vv '|' "uname -a >&2"
	vv '|' "uname -X >&2"
	;;
*)
	vv '|' "uname -a >&2"
	;;
esac
test -z "$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}..."

#
# Begin 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"
$e ... which compiler seems to be used
cat >conftest.c <<'EOF'
const char *
#if defined(__ICC) || defined(__INTEL_COMPILER)
ct="icc"
#elif defined(__xlC__) || defined(__IBMC__)
ct="xlc"
#elif defined(__SUNPRO_C)
ct="sunpro"
#elif defined(__ACK__)
ct="ack"
#elif defined(__BORLANDC__)
ct="bcc"
#elif defined(__WATCOMC__)
ct="watcom"
#elif defined(__MWERKS__)
ct="metrowerks"
#elif defined(__HP_cc)
ct="hpcc"
#elif defined(__DECC) || (defined(__osf__) && !defined(__GNUC__))
ct="dec"
#elif defined(__PGI)
ct="pgi"
#elif defined(__DMC__)
ct="dmc"
#elif defined(_MSC_VER)
ct="msc"
#elif defined(__ADSPBLACKFIN__) || defined(__ADSPTS__) || defined(__ADSP21000__)
ct="adsp"
#elif defined(__IAR_SYSTEMS_ICC__)
ct="iar"
#elif defined(SDCC)
ct="sdcc"
#elif defined(__PCC__)
ct="pcc"
#elif defined(__TenDRA__)
ct="tendra"
#elif defined(__TINYC__)
ct="tcc"
#elif defined(__llvm__) && defined(__clang__)
ct="clang"
#elif defined(__NWCC__)
ct="nwcc"
#elif defined(__GNUC__)
ct="gcc"
#elif defined(_COMPILER_VERSION)
ct="mipspro"
#elif defined(__sgi)
ct="mipspro"
#elif defined(__hpux) || defined(__hpua)
ct="hpcc"
#elif defined(__ultrix)
ct="ucode"
#elif defined(__USLC__)
ct="uslc"
#elif defined(__LCC__)
ct="lcc"
#else
ct="unknown"
#endif
;
const char *
#if defined(__KLIBC__)
et="klibc"
#else
et="unknown"
#endif
;
EOF
ct=untested
et=untested
vv ']' "$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
echo 'int main(void) { return (0); }' >conftest.c
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=$CCC_CC; export CCC_LD ;;
	esac
	;;
dec)
	vv '|' "$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 \
	    $LIBS -dumpversion`'
	;;
hpcc)
	vv '|' "$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 $LIBS -V"
	;;
lcc)
	vv '|' "$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 $LIBS -V 2>&1 | \
	    fgrep -i -e version -e release"
	;;
ucode)
	vv '|' "$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 $LIBS"
	;;
watcom)
	echo >&2 'Warning: Watcom C Compiler detected. This compiler has not yet
    been tested for compatibility with mksh. Continue at your
    own risk, please report success/failure to the developers.'
	;;
xlc)
	vv '|' "$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
case $et in
klibc)
	add_cppflags -DMKSH_NO_LIMITS
	;;
unknown)
	# nothing special detected, don’t worry
	unset et
	;;
*)
	# huh?
	;;
esac
$e "$bi==> which compiler seems to be used...$ao $ui$ct${et+ on $et}$ao"
rmf conftest.c conftest.o conftest a.out* a.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}
	if test $ct = dmc; then
		CFLAGS="$CFLAGS ${ccpl}/DELEXECUTABLE"
		ac_testn can_delexe compiler_fails 0 'for the /DELEXECUTABLE linker option' <<-EOF
			int main(void) { return (0); }
		EOF
	elif test $ct = dec; then
		CFLAGS="$CFLAGS ${ccpl}-non_shared"
		ac_testn can_delexe compiler_fails 0 'for the -non_shared linker option' <<-EOF
			int main(void) { return (0); }
		EOF
	else
		exit 1
	fi
	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

if test $ct = sunpro; then
	test x"$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"
elif test $ct = hpcc; then
	save_NOWARN=
	DOWARN=+We
elif test $ct = mipspro; then
	save_NOWARN=
	DOWARN="-diag_error 1-10000"
elif test $ct = msc; then
	save_NOWARN="${ccpc}/w"
	DOWARN="${ccpc}/WX"
elif test $ct = dmc; then
	save_NOWARN="${ccpc}-w"
	DOWARN="${ccpc}-wx"
elif test $ct = bcc; then
	save_NOWARN="${ccpc}-w"
	DOWARN="${ccpc}-w!"
elif test $ct = dec; then
	: -msg_* flags not used yet, or is -w2 correct?
elif test $ct = xlc; then
	save_NOWARN=-qflag=i:e
	DOWARN=-qflag=i:i
elif test $ct = tendra; then
	save_NOWARN=-w
elif test $ct = ucode; then
	save_NOWARN=
	DOWARN=-w2
else
	test x"$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
fi

test $ct = icc && DOWARN="$DOWARN -wd1419"
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"" && if test $ct = sunpro; then
	cat >x <<-'EOF'
		int main(void) { return (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
elif test $ct = hpcc; then
	phase=u
	ac_flags 1 otwo +O2
	phase=x
elif test $ct = xlc; then
	ac_flags 1 othree "-O3 -qstrict"
	test 1 = $HAVE_CAN_OTHREE || ac_flags 1 otwo -O2
elif test $ct = tcc || test $ct = tendra; then
	: no special optimisation
else
	ac_flags 1 otwo -O2
	test 1 = $HAVE_CAN_OTWO || ac_flags 1 optimise -O
fi
# other flags: just add them if they are supported
i=0
if test $ct = gcc; then
	# The following tests run with -Werror (gcc only) if possible
	NOWARN=$DOWARN; phase=u
	ac_flags 0 wnooverflow -Wno-overflow
	ac_flags 1 fnostrictaliasing -fno-strict-aliasing
	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
	if test $cm = lto; then
		fv=0
		checks='1 2 3 4 5 6 7 8'
	elif test $cm = combine; then
		fv=0
		checks='7 8'
	else
		fv=1
	fi
	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
	i=1
elif test $ct = icc; then
	ac_flags 1 fnobuiltinsetmode -fno-builtin-setmode
	ac_flags 1 fnostrictaliasing -fno-strict-aliasing
	ac_flags 1 fstacksecuritycheck -fstack-security-check
	i=1
elif test $ct = sunpro; then
	phase=u
	ac_flags 1 v -v
	ac_flags 1 ipo -xipo 'for cross-module optimisation'
	phase=x
elif test $ct = hpcc; then
	phase=u
	# probably not needed
	#ac_flags 1 agcc -Agcc 'for support of GCC extensions'
	phase=x
elif test $ct = dec; then
	ac_flags 0 verb -verbose
	ac_flags 1 rodata -readonly_strings
elif test $ct = dmc; then
	ac_flags 1 decl "${ccpc}-r" 'for strict prototype checks'
	ac_flags 1 schk "${ccpc}-s" 'for stack overflow checking'
elif test $ct = bcc; then
	ac_flags 1 strpool "${ccpc}-d" 'if string pooling can be enabled'
elif test $ct = mipspro; then
	ac_flags 1 fullwarn -fullwarn 'for remark output support'
elif test $ct = msc; then
	ac_flags 1 strpool "${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'
elif test $ct = xlc; then
	ac_flags 1 rodata "-qro -qroconst -qroptr"
	ac_flags 1 rtcheck -qcheck=all
	ac_flags 1 rtchkc -qextchk
	ac_flags 1 wformat "-qformat=all -qformat=nozln"
	#ac_flags 1 wp64 -qwarn64	# too verbose for now
elif test $ct = tendra; then
	ac_flags 0 ysystem -Ysystem
	test 1 = $HAVE_CAN_YSYSTEM && CPPFLAGS="-Ysystem $CPPFLAGS"
	ac_flags 1 extansi -Xa
elif test $ct = tcc; then
	: #broken# ac_flags 1 boundschk -b
elif test $ct = clang; then
	i=1
elif test $ct = nwcc; then
	i=1
	: #broken# ac_flags 1 ssp -stackprotect
fi
# 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

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))
	/* 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) {
		memmove(d, s, n); return ((int)n);
	}
	#endif
EOF
ac_test attribute_format '' 'for __attribute__((__format__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	/* 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_nonnull '' 'for __attribute__((__nonnull__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	int foo(char *s1, char *s2) __attribute__((__nonnull__));
	int bar(char *s1, char *s2) __attribute__((__nonnull__ (1, 2)));
	int baz(char *s) __attribute__((__nonnull__ (1)));
	int foo(char *s1, char *s2) { return (bar(s2, s1)); }
	int bar(char *s1, char *s2) { return (baz(s1) - baz(s2)); }
	int baz(char *s) { return (*s); }
	int main(int ac, char **av) { return (ac == foo(av[0], av[ac-1])); }
	#endif
EOF
ac_test attribute_noreturn '' 'for __attribute__((__noreturn__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	/* 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_unused '' 'for __attribute__((__unused__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	int main(int ac __attribute__((__unused__)), char **av
	    __attribute__((__unused__))) { return (0); }
	#endif
EOF
ac_test attribute_used '' 'for __attribute__((__used__))' <<-'EOF'
	#if defined(__TenDRA__) || (defined(__GNUC__) && (__GNUC__ < 2))
	/* force a failure: TenDRA and gcc 1.42 have false positive here */
	int main(void) { return (thiswillneverbedefinedIhope()); }
	#else
	static const char fnord[] __attribute__((__used__)) = "42";
	int main(void) { return (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"
	HAVE_ISSET_MKSH_CONSERVATIVE_FDS=1	# from sh.h
fi
ac_ifcpp 'ifdef MKSH_BINSHREDUCED' isset_MKSH_BINSHREDUCED '' \
    "if a reduced-feature sh is requested" && \
    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' && : ${HAVE_SETLOCALE_CTYPE=0}
ac_ifcpp 'ifdef MKSH_CONSERVATIVE_FDS' isset_MKSH_CONSERVATIVE_FDS '' \
    'if traditional/conservative fd use is requested' && \
    check_categories="$check_categories convfds"
#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"

#
# Environment: headers
#
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/select.h sys/types.h
ac_header sys/sysmacros.h
ac_header bstring.h
ac_header grp.h sys/types.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>
/* check that off_t can represent 2^63-1 correctly, thx FSF */
#define LARGE_OFF_T (((off_t)1 << 62) - 1 + ((off_t)1 << 62))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721 &&
    LARGE_OFF_T % 2147483647 == 1) ? 1 : -1];
int main(void) { return (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
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)(ptrdiff_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)(ptrdiff_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)(ptrdiff_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)(ptrdiff_t)av[ac]); }
EOF

ac_test rlim_t <<-'EOF'
	#include <sys/types.h>
	#include <sys/time.h>
	#include <sys/resource.h>
	#include <unistd.h>
	int main(void) { return ((int)(rlim_t)0); }
EOF

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

ac_testn sighandler_t '!' sig_t 0 <<-'EOF'
	#include <sys/types.h>
	#include <signal.h>
	#include <stddef.h>
	int main(void) { return ((int)(ptrdiff_t)(sighandler_t)(ptrdiff_t)kill(0,0)); }
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>
	int main(void) { return ((int)(ptrdiff_t)(__sighandler_t)(ptrdiff_t)kill(0,0)); }
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 $cm = makefile; then
	: nothing to check
else
	HAVE_LINK_WORKS=x
	ac_testinit link_works '' 'checking if the final link command may succeed'
	fv=1
	cat >conftest.c <<-'EOF'
		#define EXTERN
		#define MKSH_INCLUDES_ONLY
		#include "sh.h"
		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.590 2012/11/20 18:50:41 tg Exp $");
		int main(void) { printf("Hello, World!\n"); return (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: signals
#
test x"NetBSD" = x"$TARGET_OS" && $e Ignore the compatibility warning.

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}[];
		int main(void) { return (sys_sig${what}[0][0]); }
	EOF
	ac_testn _sys_sig$what '!' sys_sig$what 0 "the _sys_sig${what}[] array" <<-EOF
		extern const char *const _sys_sig${what}[];
		int main(void) { return (_sys_sig${what}[0][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

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

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

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

ac_test select <<-'EOF'
	#include <sys/types.h>
	#include <sys/time.h>
	#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) { setresuid(0,0,0); return (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 strlcpy <<-'EOF'
	#include <string.h>
	int main(int ac, char *av[]) { return (strlcpy(*av, av[1],
	    (size_t)ac)); }
EOF

#
# check headers for declarations
#
save_CC=$CC; save_LDFLAGS=$LDFLAGS; save_LIBS=$LIBS
CC="$CC -c -o $tcfn"; LDFLAGS=; LIBS=
ac_test '!' flock_decl flock 1 'if flock() does not need to be declared' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	#if HAVE_SYS_FILE_H
	#include <sys/file.h>
	#endif
	long flock(void);		/* this clashes if defined before */
	int main(void) { return ((int)flock()); }
EOF
ac_test '!' revoke_decl revoke 1 'if revoke() does not need to be declared' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	long revoke(void);		/* this clashes if defined before */
	int main(void) { return ((int)revoke()); }
EOF
ac_test '!' sys_siglist_decl sys_siglist 1 'if sys_siglist[] does not need to be declared' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	extern int sys_siglist[5][5][5][5][5];	/* this clashes happily */
	int main(void) { return (sys_siglist[0][0][0][0][0]); }
EOF
CC=$save_CC; LDFLAGS=$save_LDFLAGS; LIBS=$save_LIBS

#
# 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=$CFLAGS
test x1 = x$HAVE_CAN_WNOOVERFLOW && CFLAGS="$CFLAGS -Wno-overflow"
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 the next two are; we REQUIRE signed integer wraparound */
cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1));
#ifndef MKSH_GCC55009
cta(ari_sign_32_bit_and_wrap,
    (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1) >
    (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 2));
#endif
/* 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));
#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);

cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t));
cta(ptrdifft_sizet_same_size, sizeof(ptrdiff_t) == sizeof(size_t));
cta(ptrdifft_voidptr_same_size, sizeof(ptrdiff_t) == sizeof(void *));
cta(ptrdifft_funcptr_same_size, sizeof(ptrdiff_t) == sizeof(void (*)(void)));
/* our formatting routines assume this */
cta(ptr_fits_in_long, sizeof(ptrdiff_t) <= sizeof(long));
	};
#ifndef MKSH_LEGACY_MODE
#ifndef MKSH_GCC55009
#define NUM 22
#else
#define NUM 21
#endif
#else
#define NUM 15
#endif
char ctasserts_dblcheck[sizeof(struct ctasserts) == NUM ? 1 : -1];
	int main(void) { return (sizeof(ctasserts_dblcheck)); }
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

#
# runtime checks
# once this is more than one, check if we can do runtime
# checks (not cross-compiling) first to save on warnings
#
$e "${bi}run-time checks follow$ao, please ignore any weird errors"

if ac_testnnd silent_idivwrapv '' '(run-time) whether signed integer division overflows wrap silently' <<-'EOF'
	#define MKSH_INCLUDES_ONLY
	#include "sh.h"
	#if !defined(MKSH_LEGACY_MODE) || HAVE_LONG_32BIT
	#define IDIVWRAPV_VL	(mksh_uari_t)0x80000000UL
	#elif HAVE_LONG_64BIT
	#define IDIVWRAPV_VL	(mksh_uari_t)0x8000000000000000UL
	#else
	# error "cannot check this"
	#endif
	#ifdef SIGFPE
	static void fpe_catcher(int) MKSH_A_NORETURN;
	#endif
	int main(int ac, char **av) {
		mksh_ari_t o1, o2, r1, r2;

	#ifdef SIGFPE
		signal(SIGFPE, fpe_catcher);
	#endif
		o1 = (mksh_ari_t)IDIVWRAPV_VL;
		o2 = -ac;
		r1 = o1 / o2;
		r2 = o1 % o2;
		if (r1 == o1 && r2 == 0) {
			printf("si");
			return (0);
		}
		printf("no %d %d %d %d %s", (int)o1, (int)o2, (int)r1,
		    (int)r2, av[0]);
		return (1);
	}
	#ifdef SIGFPE
	static const char fpe_msg[] = "no, got SIGFPE, what were they smoking?";
	#define fpe_msglen (sizeof(fpe_msg) - 1)
	static void fpe_catcher(int sig MKSH_A_UNUSED) {
		_exit(write(1, fpe_msg, fpe_msglen) == fpe_msglen ? 2 : 3);
	}
	#endif
EOF
then
	if test $fv = 0; then
		echo "| hrm, compiling this failed, but we will just failback"
	else
		echo "| running test programme; this will fail if cross-compiling"
		echo "| in which case we will gracefully degrade to the default"
		./$tcfn >vv.out 2>&1
		rv=$?
		echo "| result: `cat vv.out`"
		fv=0
		test $rv = 0 && test x"`cat vv.out`" = x"si" && fv=1
	fi
	rmf conftest.c conftest.o ${tcfn}* vv.out
	ac_testdone
fi
ac_cppflags

$e "${bi}end of run-time checks$ao"

#
# 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
		$e No list of signal names available via cpp. Falling back...
	fi
	sigseenone=:
	sigseentwo=:
	echo '#include <signal.h>
#ifndef NSIG
#if defined(_NSIG)
#define NSIG _NSIG
#elif defined(SIGMAX)
#define NSIG (SIGMAX+1)
#endif
#endif
int
mksh_cfg= NSIG
;' >conftest.c
	# GNU sed 2.03 segfaults when optimising this to sed -n
	NSIG=`vq "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c" | \
	    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 $printf = echo || NSIG=`printf %d "$NSIG" 2>/dev/null`
	$printf "NSIG=$NSIG ... "
	sigs="INT SEGV ABRT KILL ALRM BUS CHLD CLD CONT DIL EMT FPE HUP ILL"
	sigs="$sigs INFO IO IOT LOST PIPE PROF PWR QUIT RESV SAK STOP SYS TERM"
	sigs="$sigs TRAP TSTP TTIN TTOU URG USR1 USR2 VTALRM WINCH XCPU XFSZ"
	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 '^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 -le $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 -s '!' 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="$CFLAGS -verbose"
test -n "$LDSTATIC" && add_cppflags -DMKSH_OPTSTATIC
add_cppflags -DMKSH_BUILD_R=409

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

files=
objs=
sp=
case $tcfn in
a.exe)	mkshexe=$tfn.exe ;;
*)	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=0 xflag=0
	while getopts "C:e:fPp:Ss: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=\$OPTARG ;;
	(S)	Sflag=1 ;;
	(s)	sflag=\$OPTARG ;;
	(t)	uset=1; tflag=\$OPTARG ;;
	(v)	vflag=1 ;;
	(*)	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
	print Testing mksh for conformance:
	fgrep -e MirOS: -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
if test $cm = llvm; then
	emitbc="-emit-llvm -c"
elif test $cm = dragonegg; then
	emitbc="-S -flto"
else
	emitbc=-c
fi
echo ": # work around NeXTstep bug" >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 sh.h sh_flags.h var_spec.h'
	test 0 = $HAVE_SYS_SIGNAME && extras="$extras signames.inc"
	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

# 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=	-v
#regress:
#	./test.sh \$(REGRESS_FLAGS)

# for BSD make only:
#.PATH: $srcdir
#.include <bsd.prog.mk>
EOF
	$e
	$e Generated Makefrag.inc successfully.
	exit 0
fi
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 <'$srcdir/mksh.1' >$tfn.cat1" || \
    rmf $tfn.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"
$e "# grep -x /bin/$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/"
$e
$e Installing the manual:
if test -f $tfn.cat1; then
	$e "# $i -c -o root -g bin -m 444 $tfn.cat1" \
	    "/usr/share/man/cat1/$tfn.0"
	$e or
fi
$e "# $i -c -o root -g bin -m 444 mksh.1 /usr/share/man/man1/$tfn.1"
$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 ====
MKSHRC_PATH			"~/.mkshrc" (do not change)
MKSH_A4PB			force use of arc4random_pushb
MKSH_ASSUME_UTF8		(0=disabled, 1=enabled; default: unset)
MKSH_BINSHREDUCED		if */sh or */-sh, enable set -o sh
MKSH_CLRTOEOL_STRING		"\033[K"
MKSH_CLS_STRING			"\033[;H\033[J"
MKSH_CONSERVATIVE_FDS		fd 0-9 for scripts, shell only up to 31
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 eglibc, Solaris
MKSH_NO_CMDLINE_EDITING		disable command line editing code entirely
MKSH_NO_DEPRECATED_WARNING	omit warning when deprecated stuff is run
MKSH_NO_EXTERNAL_CAT		omit hack to skip cat builtin when flags passed
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 -v) 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
https://www.mirbsd.org/cvs.cgi/contrib/hosted/tg/deb/mksh/debian/.mkshrc?rev=HEAD
and put dot.mkshrc as /etc/mkshrc so users need not keep up their HOME.

EOD