configure

早期freebsd实现

    echo "Looks kind of like a BSD system, but we'll see..."
    echo exit 0 >bsd
    echo exit 1 >usg
    echo exit 1 >v7
elif $contains '^fcntl$' libc.list >/dev/null 2>&1 ; then
    echo "Looks kind of like a USG system, but we'll see..."
    echo exit 1 >bsd
    echo exit 0 >usg
    echo exit 1 >v7
else
    echo "Looks kind of like a version 7 system, but we'll see..."
    echo exit 1 >bsd
    echo exit 1 >usg
    echo exit 0 >v7
fi
if $contains '^vmssystem$' libc.list >/dev/null 2>&1 ; then
    cat <<'EOI'
There is, however, a strange, musty smell in the air that reminds me of
something...hmm...yes...I've got it...there's a VMS nearby, or I'm a Blit.
EOI
    echo "exit 0" >eunice
    eunicefix=unixtovms
    d_eunice="$define"
: it so happens the Eunice I know will not run shell scripts in Unix format
else
    echo " "
    echo "Congratulations.  You aren't running Eunice."
    eunicefix=':'
    d_eunice="$undef"
    echo "exit 1" >eunice
fi
if test -f /xenix; then
    echo "Actually, this looks more like a XENIX system..."
    echo "exit 0" >xenix
else
    echo " "
    echo "It's not Xenix..."
    echo "exit 1" >xenix
fi
chmod +x xenix
$eunicefix xenix
if test -f /venix; then
    echo "Actually, this looks more like a VENIX system..."
    echo "exit 0" >venix
else
    echo " "
    if xenix; then
	: null
    else
	echo "Nor is it Venix..."
    fi
    echo "exit 1" >venix
fi
chmod +x bsd usg v7 eunice venix
$eunicefix bsd usg v7 eunice venix
rmlist="$rmlist bsd usg v7 eunice venix xenix"

: see if sh knows # comments
echo " "
echo "Checking your sh to see if it knows about # comments..."
if sh -c '#' >/dev/null 2>&1 ; then
    echo "Your sh handles # comments correctly."
    shsharp=true
    spitshell=cat
    echo " "
    echo "Okay, let's see if #! works on this system..."
    echo "#!/bin/echo hi" > try
    $eunicefix try
    chmod +x try
    try > today
    if $contains hi today >/dev/null 2>&1; then
	echo "It does."
	sharpbang='#!'
    else
	echo "#! /bin/echo hi" > try
	$eunicefix try
	chmod +x try
	try > today
	if test -s today; then
	    echo "It does."
	    sharpbang='#! '
	else
	    echo "It doesn't."
	    sharpbang=': use '
	fi
    fi
else
    echo "Your sh doesn't grok # comments--I will strip them later on."
    shsharp=false
    echo "exec grep -v '^#'" >spitshell
    chmod +x spitshell
    $eunicefix spitshell
    spitshell=`pwd`/spitshell
    echo "I presume that if # doesn't work, #! won't work either!"
    sharpbang=': use '
fi

: figure out how to guarantee sh startup
echo " "
echo "Checking out how to guarantee sh startup..."
startsh=$sharpbang'/bin/sh'
echo "Let's see if '$startsh' works..."
cat >try <<EOSS
$startsh
set abc
test "$?abc" != 1
EOSS

chmod +x try
$eunicefix try
if try; then
    echo "Yup, it does."
else
    echo "Nope.  You may have to fix up the shell scripts to make sure sh runs them."
fi
rm -f try today

#: see if sprintf is declared as int or pointer to char
#echo " "
#cat >.ucbsprf.c <<'EOF'
#main() { char buf[10]; exit((unsigned long)sprintf(buf,"%s","foo") > 10L); }
#EOF
#if cc .ucbsprf.c -o .ucbsprf >/dev/null 2>&1 && .ucbsprf; then
#    echo "Your sprintf() returns (int)."
#    d_charsprf="$undef"
#else
#    echo "Your sprintf() returns (char*)."
#    d_charsprf="$define"
#fi
#/bin/rm -f .ucbsprf.c .ucbsprf

: see if we can have long filenames
echo " "
rm -f 123456789abcde
if (echo hi >123456789abcdef) 2>/dev/null; then
    : not version 8
    if test -f 123456789abcde; then
	echo 'You cannot have filenames longer than 14 characters.  Sigh.'
	d_flexfnam="$undef"
    else
	echo 'You can have filenames longer than 14 characters.'
	d_flexfnam="$define"
    fi
else
    : version 8 probably
    echo "You can't have filenames longer than 14 chars.  V8 can't even think about them!"
    d_flexfnam="$undef"
fi 
: index or strcpy
echo " "
case "$d_index" in
n) dflt=n;;
*) dflt=y;;
esac
if $contains '^index$' libc.list >/dev/null 2>&1 ; then
    if $contains '^strchr$' libc.list >/dev/null 2>&1 ; then
	echo "Your system has both index() and strchr().  Shall I use"
	rp="index() rather than strchr()? [$dflt]"
	$echo $n "$rp $c"
	. myread
	case "$ans" in
	    n*) d_index="$define" ;;
	    *)  d_index="$undef" ;;
	esac
    else
	d_index="$undef"
	echo "index() found."
    fi
else
    if $contains '^strchr$' libc.list >/dev/null 2>&1 ; then
	d_index="$define"
	echo "strchr() found."
    else
	echo "No index() or strchr() found!"
	d_index="$undef"
    fi
fi

: see if signal is declared as pointer to function returning int or void
echo " "
if $contains 'void.*signal' /usr/include/signal.h >/dev/null 2>&1 ||
$contains 'void.*signal' /usr/include/sys/signal.h >/dev/null 2>&1 ; then
    echo "You have void (*signal())() instead of int."
    d_voidsig="$define"
else
    echo "You have int (*signal())() instead of void."
    d_voidsig="$undef"
fi

: check for directory library
echo " "
if test -f /usr/include/dirent.h; then
    echo "You have dirent.h."
    d_dirheader="#define DIRENT"
elif test -f /usr/include/ndir.h; then
    echo "You have ndir.h."
    d_dirheader="#define USG"
elif test -f /usr/include/sys/ndir.h; then
    echo "You have sys/ndir.h."
    d_dirheader="#define SYSNDIR
#define USG"
elif test -f /usr/include/sys/dir.h; then
    echo "You have sys/dir.h; I hope that's the BSD version."
    d_dirheader="#define SYSDIR"
else
    echo "I can't find a directory library header file.
That means you won't have numbered backups available."
    d_dirheader="#define NODIR"
fi

: check for unistd.h
echo " "
if test -f /usr/include/unistd.h; then
    echo "You have unistd.h."
    d_unistd="$define"
else
    echo "I don't see unistd.h, but that's OK."
    d_unistd="$undef"
fi

: check for void type
echo " "
$cat <<EOM
Checking to see how well your C compiler groks the void type...

  Support flag bits are:
    1: basic void declarations.
    2: arrays of pointers to functions returning void.
    4: operations between pointers to and addresses of void functions.

EOM
case "$voidflags" in
'')
    $cat >try.c <<'EOCP'
#if TRY & 1
void main() {
#else
main() {
#endif
	extern void *moo();
	void *(*goo)();
#if TRY & 2
	void (*foo[10])();
#endif

#if TRY & 4
	if(*goo == moo) {
		exit(0);
	}
#endif
	exit(0);
}
EOCP
    : Argh -- AIX 3.2 does not have cc -S!
    if cc -c -DTRY=7 try.c >.out 2>&1 ; then
	voidflags=7
	echo "It appears to support void fully."
	if $contains warning .out >/dev/null 2>&1; then
	    echo "However, you might get some warnings that look like this:"
	    $cat .out
	fi
    else
	echo "Hmm, you compiler has some difficulty with void.  Checking further..."
	if cc -c -DTRY=1 try.c >/dev/null 2>&1 ; then
	    echo "It supports 1..."
	    if cc -c -DTRY=3 try.c >/dev/null 2>&1 ; then
		voidflags=3
		echo "And it supports 2 but not 4."
	    else
		echo "It doesn't support 2..."
		if cc -c -DTRY=3 try.c >/dev/null 2>&1 ; then
		    voidflags=5
		    echo "But it supports 4."
		else
		    voidflags=1
		    echo "And it doesn't support 4."
		fi
	    fi
	else
	    echo "There is no support at all for void."
	    voidflags=0
	fi
    fi
esac
dflt="$voidflags";
rp="Your void support flags add up to what? [$dflt]"
$echo $n "$rp $c"
. myread
voidflags="$ans"
$rm -f try.* .out

: see how we invoke the C preprocessor
echo " "
echo "Now, how can we feed standard input to your C preprocessor..."
cat <<'EOT' >testcpp.c
#define ABC abc
#define XYZ xyz
ABC.XYZ
EOT
echo 'Maybe "'$cpp'" will work...'
$cpp <testcpp.c >testcpp.out 2>&1
if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
    echo "Yup, it does."
    cppstdin="$cpp"
    cppminus='';
else
    echo 'Nope, maybe "'$cpp' -" will work...'
    $cpp - <testcpp.c >testcpp.out 2>&1
    if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
	echo "Yup, it does."
	cppstdin="$cpp"
	cppminus='-';
    else
	echo 'No such luck...maybe "cc -E" will work...'
	cc -E <testcpp.c >testcpp.out 2>&1
	if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
	    echo "It works!"
	    cppstdin='cc -E'
	    cppminus='';
	else
	    echo 'Nixed again...maybe "cc -E -" will work...'
	    cc -E - <testcpp.c >testcpp.out 2>&1
	    if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
		echo "Hooray, it works!  I was beginning to wonder."
		cppstdin='cc -E'
		cppminus='-';
	    else
		echo 'Nope...maybe "cc -P" will work...'
		cc -P <testcpp.c >testcpp.out 2>&1
		if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
		    echo "Yup, that does."
		    cppstdin='cc -P'
		    cppminus='';
		else
		    echo 'Nope...maybe "cc -P -" will work...'
		    cc -P - <testcpp.c >testcpp.out 2>&1
		    if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
			echo "Yup, that does."
			cppstdin='cc -P'
			cppminus='-';
		    else
			echo 'Hmm...perhaps you already told me...'
			case "$cppstdin" in
			'') ;;
			*) $cppstdin $cppminus <testcpp.c >testcpp.out 2>&1;;
			esac
			if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
			    echo "Hooray, you did!  I was beginning to wonder."
			else
			    echo 'Uh-uh.  Time to get fancy...'
			    echo 'Trying (cat >/tmp/$$.c; cc -E /tmp/$$.c; rm /tmp/$$.c)'
			    cppstdin='(cat >/tmp/$$.c; cc -E /tmp/$$.c; rm /tmp/$$.c)'
			    cppminus='';
			    $cppstdin <testcpp.c >testcpp.out 2>&1
			    if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
				echo "Eureka!."
			    else
				dflt=blurfl
				$echo $n "No dice.  I can't find a C preprocessor.  Name one: $c"
				rp='Name a C preprocessor:'
				. myread
				cppstdin="$ans"
				$cppstdin <testcpp.c >testcpp.out 2>&1
				if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
				    echo "OK, that will do."
				else
				    echo "Sorry, I can't get that to work.  Go find one."
				    exit 1
				fi
			    fi
			fi
		    fi
		fi
	    fi
	fi
    fi
fi
rm -f testcpp.c testcpp.out

: get C preprocessor symbols handy
echo " "
: AIX 3.2 rejects tr '[ - ]' because the range endpoints are the same.
echo $attrlist | $tr ' ' '\012' >Cppsym.know
$cat <<EOSS >Cppsym
$startsh
case "\$1" in
-l) list=true
    shift
    ;;
esac
unknown=''
case "\$list\$#" in
1|2)
    for sym do
	if $contains "^\$1$" Cppsym.true >/dev/null 2>&1; then
	    exit 0
	elif $contains "^\$1$" Cppsym.know >/dev/null 2>&1; then
		:
	else
	    unknown="\$unknown \$sym"
	fi
    done
    set X \$unknown
    shift
    ;;
esac
case \$# in
0) exit 1;;
esac
echo \$* | $tr ' ' '\012' | $sed -e 's/\(.*\)/\\
#ifdef \1\\
exit 0; _ _ _ _\1\\	 \1\\
#endif\\
/' >/tmp/Cppsym\$\$
echo exit 1 >>/tmp/Cppsym\$\$
$cppstdin $cppminus </tmp/Cppsym\$\$ >/tmp/Cppsym2\$\$
case "\$list" in
true) awk 'NF > 5 {print substr(\$6,2,100)}' </tmp/Cppsym2\$\$ ;;
*)
    sh /tmp/Cppsym2\$\$
    status=\$?
    ;;
esac
$rm -f /tmp/Cppsym\$\$ /tmp/Cppsym2\$\$
exit \$status
EOSS
chmod +x Cppsym
$eunicefix Cppsym
echo "Your C preprocessor defines the following symbols:"
Cppsym -l $attrlist >Cppsym.true
cat Cppsym.true
rmlist="$rmlist Cppsym Cppsym.know Cppsym.true"

: see how many register declarations we want to use
case "$registers" in
'')
    if Cppsym vax; then
	dflt=6
    elif Cppsym sun mc68000 mc68k m68k; then
	dflt=10
    elif Cppsym pyr; then
	dflt=14
    elif Cppsym ns32000 ns16000; then
	dflt=5
    elif Cppsym $smallmach; then
	dflt=3
    else
	: if you have any other numbers for me, send them in
	dflt=6
    fi
    ;;
*)  dflt=$registers ;;
esac
cat <<EOM
 
Different C compilers on different machines pay attention to different
numbers of register declarations.  About how many register declarations in
EOM
$echo $n "each routine does your C compiler pay attention to? (OK to guess) [$dflt] $c"
rp="# register declarations used? [$dflt]"
. myread
registers=$ans
reg1=''
awk "BEGIN { for (i=1; i<=16; i++) printf \"reg%d=''\n\", i}" </dev/null >.foo
. .foo
awk "BEGIN { for (i=1; i<=$registers; i++) printf \"reg%d=register\n\", i}" \
	</dev/null >.foo
. .foo
rm -f .foo

: preserve RCS keywords in files with variable substitution, grrr
Log='$Log'
Header='$Header'

: set up shell script to do ~ expansion
cat >filexp <<EOSS
$startsh
: expand filename
case "\$1" in
 ~/*|~)
    echo \$1 | $sed "s|~|\${HOME-\$LOGDIR}|"
    ;;
 ~*)
    if $test -f /bin/csh; then
	/bin/csh -f -c "glob \$1"
	echo ""
    else
	name=\`$expr x\$1 : '..\([^/]*\)'\`
	dir=\`$sed -n -e "/^\${name}:/{s/^[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:\([^:]*\).*"'\$'"/\1/" -e p -e q -e '}' </etc/passwd\`
	if $test ! -d "\$dir"; then
	    me=\`basename \$0\`
	    echo "\$me: can't locate home directory for: \$name" >&2