?X:  These units are based on the ones supplied with dist-3.0
?X:  patchlevel 22.  They have been changed or enhanced to work with
?X:  perl5alpha.  I would appreciate hearing about any changes,
?X:  corrections, or enhancements.
?X:	Andy Dougherty			doughera@lafcol.lafayette.edu
?X:	Dept. of Physics 		
?X:	Lafayette College	
?X:	Easton, PA  18042-1782
?X:     Sat Apr  2 15:45:17 EST 1994
?RCS: $Id: libc.U,v 3.0.1.3 1994/01/24 14:12:17 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: libc.U,v $
?RCS: Revision 3.0.1.3  1994/01/24  14:12:17  ram
?RCS: patch16: can now export nm_extract as an internal-use only variable
?RCS:
?RCS: Revision 3.0.1.2  1993/09/13  16:09:03  ram
?RCS: patch10: added special handling for Apollo systems (WAD)
?RCS:
?RCS: Revision 3.0.1.1  1993/08/27  14:40:03  ram
?RCS: patch7: added entry for /usr/shlib/libc.so (OSF/1 machines)
?RCS:
?RCS: Revision 3.0  1993/08/18  12:08:57  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:libc +nm_extract: echo n c rm test grep Getfile Myread Oldconfig Loc \
	sed libs incpath libpth runnm nm_opt contains plibpth xlibpth
?MAKE:	-pick add $@ %<
?S:libc:
?S:	This variable contains the location of the C library.
?S:.
?S:nm_extract:
?S:	This variable holds the name of the extraction command used to process
?S:	the output of nm and yield the list of defined symbols. It is used
?S:	internally by Configure.
?S:.
?T:thislib try libnames xxx xscan xrun thisname com tans
?LINT:change libpth nm_opt
case "$runnm" in
true)
?X: indentation is wrong on purpose--RAM
: get list of predefined functions in a handy place
echo " "
case "$libc" in
'') libc=unknown
	case "$libs" in
	*-lc_s*) libc=`./loc libc_s.a $libc $libpth`
	esac
	;;
esac
libpth="$plibpth $libpth"
libnames='';
case "$libs" in
'') ;;
*)  for thislib in $libs; do
	case "$thislib" in
	-l*)
		thislib=`expr X$thislib : 'X-l\(.*\)'`
		try=`./loc lib$thislib.a blurfl/dyick $libpth`
		if test ! -f $try; then
			try=`./loc lib$thislib blurfl/dyick $libpth`
			if test ! -f $try; then
				try=`./loc lib$thislib.so.'*' blurfl/dyick $libpth`
				if test ! -f $try; then
					try=`./loc $thislib blurfl/dyick $libpth`
					if test ! -f $try; then
						try=`./loc Slib$thislib.a blurfl/dyick $xlibpth`
						if test ! -f $try; then
							try=''
						fi
					fi
				fi
			fi
		fi
		libnames="$libnames $try"
		;;
	*) libnames="$libnames $thislib" ;;
	esac
	done
	;;
esac
?X:
?X: Some systems (e.g. DG/UX) use "environmental" links, which make the test
?X: -f fail. Ditto for symbolic links. So in order to reliably check the
?X: existence of a file, we use test -r. It will still fail with DG/UX links 
?X: though, but at least it will detect symbolic links. At some strategic
?X: points, we make use of (test -h), using a sub-shell in case builtin test
?X: does not implement the -h check for symbolic links. This makes it
?X: possible to preset libc in a hint file for instance and have it show up
?X: as-is in the question.
?X:
xxx=normal
case "$libc" in
unknown)
	set /usr/ccs/lib/libc.so
	$test -r $1 || set /usr/lib/libc.so
	$test -r $1 || set /usr/shlib/libc.so
	$test -r $1 || set /usr/lib/libc.so.[0-9]*
	$test -r $1 || set /lib/libsys_s.a
	eval set \$$#
	;;
*)
?X: ensure the test below for the (shared) C library will fail
	set blurfl
	;;
esac
if $test -r "$1"; then
	echo "Your (shared) C library seems to be in $1."
	libc="$1"
elif $test -r /lib/libc && $test -r /lib/clib; then
?X:
?X: Apollo has its C library in /lib/clib AND /lib/libc
?X: not to mention its math library in /lib/syslib...
?X:
	echo "Your C library seems to be in both /lib/clib and /lib/libc."
	xxx=apollo
	libc='/lib/clib /lib/libc'
	if $test -r /lib/syslib; then
		echo "(Your math library is in /lib/syslib.)"
?X: Put syslib in libc -- not quite right, but won't hurt
		libc="$libc /lib/syslib"
	fi
elif $test -r "$libc" || (test -h "$libc") >/dev/null 2>&1; then
	echo "Your C library seems to be in $libc, as you said before."
?X: For mips, and...
elif $test -r $incpath/usr/lib/libc.a; then
	libc=$incpath/usr/lib/libc.a;
	echo "Your C library seems to be in $libc.  That's fine."
elif $test -r /lib/libc.a; then
	libc=/lib/libc.a;
	echo "Your C library seems to be in $libc.  You're normal."
else
	if tans=`./loc libc.a blurfl/dyick $libpth`; $test -r "$tans"; then
		:
	elif tans=`./loc libc blurfl/dyick $libpth`; $test -r "$tans"; then
		libnames="$libnames "`./loc clib blurfl/dyick $libpth`
	elif tans=`./loc clib blurfl/dyick $libpth`; $test -r "$tans"; then
		:
	elif tans=`./loc Slibc.a blurfl/dyick $xlibpth`; $test -r "$tans"; then
		:
	elif tans=`./loc Mlibc.a blurfl/dyick $xlibpth`; $test -r "$tans"; then
		:
	else
		tans=`./loc Llibc.a blurfl/dyick $xlibpth`
	fi
	if $test -r "$tans"; then
		echo "Your C library seems to be in $tans, of all places."
		libc=$tans
	else
		libc='blurfl'
	fi
fi
if $test $xxx = apollo -o -r "$libc" || (test -h "$libc") >/dev/null 2>&1; then
	dflt="$libc"
	cat <<EOM

If the guess above is wrong (which it might be if you're using a strange
compiler, or your machine supports multiple models), you can override it here.

EOM
else
	dflt=''
	echo $libpth | tr ' ' '\012' | sort | uniq > libpath
	cat >&4 <<EOM
I can't seem to find your C library.  I've looked in the following places:

EOM
	$sed 's/^/	/' libpath
	cat <<EOM

None of these seems to contain your C library. I need to get its name...

EOM
fi
fn=f
rp='Where is your C library?'
. ./getfile
libc="$ans"

echo " "
echo $libc $libnames | tr ' ' '\012' | sort | uniq > libnames
set X `cat libnames`
shift
xxx=files
case $# in 1) xxx=file; esac
echo "Extracting names from the following $xxx for later perusal:" >&4
echo " "
$sed 's/^/	/' libnames >&4
echo " "
$echo $n "This may take a while...$c" >&4

nm $nm_opt $* 2>/dev/null >libc.tmp
$echo $n ".$c"
?X:
?X: To accelerate processing, we look at the correct 'sed' command
?X:	by using a small subset of libc.tmp, i.e. fprintf function.
?X: When we know which sed command to use, do the name extraction
?X:
$grep fprintf libc.tmp > libc.ptf
?X:
?X: In order to ehance readability and save some space, we define
?X:	some variables that will be "eval"ed.
?X:
xscan='eval "<libc.ptf $com >libc.list"; $echo $n ".$c" >&4'
xrun='eval "<libc.tmp $com >libc.list"; echo "done" >&4'
?X: BSD-like output
if com="$sed -n -e 's/^.* [ADTS]  *_[_.]*//p' -e 's/^.* [ADTS] //p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
?X: SYSV-like output
elif com="$sed -n -e 's/^__*//' -e 's/^\([a-zA-Z_0-9$]*\).*xtern.*/\1/p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
elif com="$sed -n -e '/|UNDEF/d' -e '/FUNC..GL/s/^.*|__*//p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
elif com="$sed -n -e 's/^.* D __*//p' -e 's/^.* D //p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
elif com="$sed -n -e 's/^_//' -e 's/^\([a-zA-Z_0-9]*\).*xtern.*text.*/\1/p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
elif com="$sed -n -e 's/^.*|FUNC |GLOB .*|//p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
elif com="$grep '|' | $sed -n -e '/|COMMON/d' -e '/|DATA/d' \
				-e '/ file/d' -e 's/^\([^ 	]*\).*/\1/p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
elif com="$sed -n -e 's/^.*|FUNC |GLOB .*|//p' -e 's/^.*|FUNC |WEAK .*|//p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
?X: mips nm output (sysV)
elif com="$sed -n -e 's/^__//' -e '/|Undef/d' -e '/|Proc/s/ .*//p'";\
	eval $xscan;\
	$contains '^fprintf$' libc.list >/dev/null 2>&1; then
		eval $xrun
else
	nm -p $* 2>/dev/null >libc.tmp
	com="$sed -n -e 's/^.* [ADTS]  *_[_.]*//p' -e 's/^.* [ADTS] //p'";\
	eval "<libc.tmp $com >libc.list"
	if $contains '^fprintf$' libc.list >/dev/null 2>&1; then
		nm_opt='-p'
		echo "done" >&4
	else
		echo " "
		echo "nm didn't seem to work right. Trying ar instead..." >&4
		com=''
		if ar t $libc > libc.tmp; then
			for thisname in $libnames; do
				ar t $thisname >>libc.tmp
			done
			$sed -e 's/\.o$//' < libc.tmp > libc.list
			echo "Ok." >&4
		else
			echo "ar didn't seem to work right." >&4
			echo "Maybe this is a Cray...trying bld instead..." >&4
			if bld t $libc | $sed -e 's/.*\///' -e 's/\.o:.*$//' > libc.list; then
				for thisname in $libnames; do
					bld t $libnames | \
					$sed -e 's/.*\///' -e 's/\.o:.*$//' >>libc.list
					ar t $thisname >>libc.tmp
				done
				echo "Ok." >&4
			else
				echo "That didn't work either.  Giving up." >&4
				exit 1
			fi
		fi
	fi
fi
nm_extract="$com"
if $test -f /lib/syscalls.exp; then
	echo " "
	echo "Also extracting names from /lib/syscalls.exp for good ole AIX..." >&4
	$sed -n 's/^\([^ 	]*\)[ 	]*syscall$/\1/p' /lib/syscalls.exp >>libc.list
fi
?X: remember, indentation is wrong on purpose--RAM
;;
esac
$rm -f libnames libpath