a2p
accept
access
acct
addftinfo
addr2line
adjtime
afmtodit
after
aio_cancel
aio_error
aio_read
aio_return
aio_suspend
aio_waitcomplete
aio_write
alias
aliases
alloc
anvil
append
apply
apropos
ar
array
as
asa
asn1parse
at
atq
atrm
attemptckalloc
attemptckrealloc
authlib
authtest
autopoint
awk
b64decode
b64encode
basename
batch
bc
bdes
bell
bg
bgerror
biff
big5
binary
bind
bindkey
bindtags
bindtextdomain
bio
bitmap
blowfish
bn
bootparams
bootptab
bounce
brandelf
break
breaksw
brk
bsdiff
bsdtar
bsnmpd
bspatch
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builtin
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bunzip2
button
byacc
bzcat
bzegrep
bzfgrep
bzgrep
bzip2
c2ph
c89
c99
ca
cal
calendar
canvas
cap_mkdb
case
cat
catch
catman
cc
cd
cdcontrol
chdir
checkbutton
checknr
chflags
chfn
chgrp
chio
chkey
chmod
chown
chpass
chroot
chsh
ci
ciphers
ckalloc
ckdist
ckfree
ckrealloc
cksum
cleanup
clear
clipboard
clock
clock_getres
clock_gettime
clock_settime
close
cmp
co
col
colcrt
colldef
colors
colrm
column
comm
command
compile_et
complete
compress
concat
config
connect
console
continue
core
courierlogger
couriertcpd
cp
cpan
cpio
cpp
creat
crl
crontab
crunchgen
crunchide
crypt
crypto
csh
csplit
ctags
ctm
ctm_dequeue
ctm_rmail
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cu
cursor
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cvs
date
dbiprof
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dc
dcgettext
dcngettext
dd
dde
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defer
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des
destroy
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df
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dgst
dh
dhparam
dialog
diff
diff3
dig
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dirent
dirname
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discard
disktab
dngettext
do
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dprofpp
dsa
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dtmfdecode
du
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dup2
eaccess
ec
ecdsa
echo
echotc
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edit
editrc
ee
egrep
elf
elfdump
elif
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enc
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engine
enigma
entry
env
envsubst
eof
eqn
err
errno
error
errstr
esac
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euc
eui64
eval
event
evp
ex
exec
execve
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expand
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exports
expr
extattr
extattr_delete_fd
extattr_delete_file
extattr_get_fd
extattr_get_file
extattr_set_fd
extattr_set_file
f77
false
famm
famx
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fc
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fg
fgrep
fhopen
fhstat
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fi
file
file2c
fileevent
filename
filetest
find
find2perl
finger
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fmt
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fontedit
for
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fork
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forward
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frame
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ftp
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g711conv
gb2312
gb18030
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gcc
gcore
gcov
gdb
gencat
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gensnmptree
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grid
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hashstat
hd
head
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hexdump
history
host
hostname
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hosts_access
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hpftodit
http
hup
i386_get_ioperm
i386_get_ldt
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i386_set_ldt
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iconv
id
ident
idprio
if
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ifnames259
image
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incr
indent
indxbib
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infokey
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intro
introduction
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ipcrm
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lam
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lastcomm
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ld
ldap
ldapadd
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leave
less
lesskey
lex
lgetfh
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libnetcfg
library
limit
limits
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link
linprocfs
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lint
lio_listio
list
listbox
listen
lj4_font
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llength
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ln
load
loadfont
local
locale
locate
lock
lockf
log
logger
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lp
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lutimes
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magic
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nex
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nice
nl
nm
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notify
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nslookup
ntp_adjtime
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nview
objcopy
objdump
objformat
ocsp
od
onintr
open
openssl
opieaccess
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opiekey
opiekeys
opiepasswd
option
options
oqmgr
pack
package
packagens
pagesize
palette
pam_auth
panedwindow
parray
passwd
paste
patch
pathchk
pathconf
pawd
pax
pbm
pcre
pcreapi
pcrebuild
pcrecallout
pcrecompat
pcrecpp
pcregrep
pcrematching
pcrepartial
pcrepattern
pcreperform
pcreposix
pcreprecompile
pcresample
pcretest
perl
perl56delta
perl58delta
perl561delta
perl570delta
perl571delta
perl572delta
perl573delta
perl581delta
perl582delta
perl583delta
perl584delta
perl585delta
perl586delta
perl587delta
perl588delta
perl5004delta
perl5005delta
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perlamiga
perlapi
perlapio
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perldgux
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perldoc
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perldsc
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perlepoc
perlfaq
perlfaq1
perlfaq2
perlfaq3
perlfaq4
perlfaq5
perlfaq6
perlfaq7
perlfaq8
perlfaq9
perlfilter
perlfork
perlform
perlfreebsd
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perlglossary
perlgpl
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perlhack
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perlintern
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perlmint
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perlqnx
perlre
perlref
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perluts
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perlvmesa
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perlwin32
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perlxstut
perror
pfbtops
pftp
pgrep
phones
photo
pic
pickup
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pid
pipe
pkcs7
pkcs8
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pkg_add
pkg_check
pkg_create
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pkg_info
pkg_sign
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pkill
pl2pm
place
pod2html
pod2latex
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pod2text
pod2usage
podchecker
podselect
poll
popd
popup
posix_madvise
postalias
postcat
postconf
postdrop
postfix
postkick
postlock
postlog
postmap
postqueue
postsuper
pr
pread
preadv
printcap
printenv
printf
proc
procfs
profil
protocols
prove
proxymap
ps
psed
psroff
pstruct
ptrace
publickey
pushd
puts
pwd
pwrite
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qmgr
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radiobutton
raise
rand
ranlib
rcp
rcs
rcsclean
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rcsfile
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read
readelf
readlink
readonly
readv
realpath
reboot
recv
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recvmsg
red
ree
refer
regexp
registry
regsub
rehash
remote
rename
repeat
replace
req
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resource
return
rev
revoke
rfcomm_sppd
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ripemd
ripemd160
rlog
rlogin
rm
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rmdir
rpc
rpcgen
rs
rsa
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rsh
rtld
rtprio
rup
ruptime
rusers
rwall
rwho
s2p
safe
sasl
sasldblistusers2
saslpasswd2
sbrk
scache
scale
scan
sched
sched_getparam
sched_getscheduler
sched_get_priority_max
sched_get_priority_min
sched_rr_get_interval
sched_setparam
sched_setscheduler
sched_yield
scon
scp
script
scrollbar
sdiff
sed
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selection
semctl
semget
semop
send
sendbug
sendfile
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set
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_exit
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FreeBSD/Linux/UNIX General Commands Manual
Hypertext Man Pages
lint
 
LINT(1) 		FreeBSD General Commands Manual 	       LINT(1)

NAME
     lint -- a C program verifier

SYNOPSIS
     lint [-abceghprvwxzHFV] [-s | -t] [-i | -nu] [-D name[=def]] [-U name]
	  [-I directory] [-d directory] [-L directory] [-l library]
	  [-o outputfile] [-B directory] [-X id[,id ...]] file ...
     lint [-abceghprvwzHFV] [-s | -t] -C library [-D name[=def]] [-U name]
	  [-I directory] [-d directory] [-B directory] [-X id[,id ...]]
	  file ...

DESCRIPTION
     The lint utility attempts to detect features of the named C program files
     that are likely to be bugs, to be non-portable, or to be wasteful.  It
     also performs stricter type checking than does the C compiler.  The lint
     utility runs the C preprocessor as its first phase, with the preprocessor
     symbol ``lint'' defined to allow certain questionable code to be altered
     or skipped by lint.  Therefore, this symbol should be thought of as a
     reserved word for all code that is to be checked by lint.

     Among the possible problems that are currently noted are unreachable
     statements, loops not entered at the top, variables declared and not
     used, and logical expressions with constant values.  Function calls are
     checked for inconsistencies, such as calls to functions that return val-
     ues in some places and not in others, functions called with varying num-
     bers of arguments, function calls that pass arguments of a type other
     than the type the function expects to receive, functions whose values are
     not used, and calls to functions not returning values that use the non-
     existent return value of the function.

     Filename arguments ending with .c are taken to be C source files.	File-
     name arguments with names ending with .ln are taken to be the result of
     an earlier invocation of lint, with either the -i, -o, or -C option in
     effect.  The .ln files are analogous to the .o (object) files produced by
     cc(1) from .c files.  The lint utility also accepts special libraries
     specified with the -l option, which contain definitions of library rou-
     tines and variables.

     The lint utility takes all the .c, .ln, and llib-llibrary.ln (lint
     library) files and processes them in command-line order.  By default,
     lint appends the standard C lint library (llib-lc.ln) to the end of the
     list of files.  When the -i option is used, the .ln files are ignored.
     Also, when the -o or -i options are used, the llib-llibrary.ln files are
     ignored.  When the -i option is omitted the second pass of lint checks
     this list of files for mutual compatibility.  At this point, if a com-
     plaint stems not from a given source file, but from one of its included
     files, the source filename will be printed followed by a question mark.

     The special input file name ``-'' causes lint to take input from standard
     input (until end of file) and process it as if it were a .c file.	If the
     -i flag is given and ``-'' is named as one of the input files, the -o
     flag must also be specified to provide an output file name.  The options
     are as follows:

     -a      Report assignments of long values to variables that are not long.

     -aa     Additional to -a, report all assignments of integer values to
	     other integer values which cause implicit narrowing conversion.

     -b      Report break statements that cannot be reached.  This is not the
	     default because, unfortunately, most lex(1) and many yacc(1) out-
	     puts produce many such complaints.

     -c      Complain about casts which have questionable portability.

     -e      Complain about unusual operations on enum-Types and combinations
	     of enum- and integer-Types.

     -g      Do not print warnings for some extensions of gcc(1) to the C lan-
	     guage.  Currently these are nonconstant initializers in automatic
	     aggregate initializations, arithmetic on pointer to void, trail-
	     ing commas in enum declarations, C++ -style ``//'' comments, zero
	     sized structures, subscripting of non-lvalue arrays, prototypes
	     overriding old style function declarations and long long integer
	     types.  The -g flag also turns on the keywords asm and inline
	     (alternative keywords with leading underscores for both asm and
	     inline are always available).

     -h      Apply a number of heuristic tests to attempt to intuit bugs,
	     improve style, and reduce waste.

     -i      Produce a .ln file for every .c file on the command line.	These
	     .ln files are the product of lint's first pass only, and are not
	     checked for compatibility between functions.

     -n      Do not check compatibility against the standard library.

     -p      Attempt to check portability of code to other dialects of C.

     -r      In case of redeclarations report the position of the previous
	     declaration.

     -s      Strict ANSI C mode.  Issue warnings and errors required by ANSI
	     C.  Also do not produce warnings for constructs which behave dif-
	     ferently in traditional C and ANSI C.  With the -s flag,
	     __STRICT_ANSI__ is a predefined preprocessor macro.

     -t      Traditional C mode.  __STDC__ is not predefined in this mode.
	     Warnings are printed for constructs not allowed in traditional C.
	     Warnings for constructs which behave differently in traditional C
	     and ANSI C are suppressed.  Preprocessor macros describing the
	     machine type (e.g., sun3) and machine architecture (e.g., m68k)
	     are defined without leading and trailing underscores.  The key-
	     words const, volatile and signed are not available in traditional
	     C mode (although the alternative keywords with leading under-
	     scores still are).

     -u      Do not complain about functions and external variables used and
	     not defined, or defined and not used (this is suitable for run-
	     ning lint on a subset of files comprising part of a larger pro-
	     gram).

     -v      Suppress complaints about unused arguments in functions.

     -x      Report variables referred to by extern declarations, but never
	     used.

     -z      Do not complain about structures that are never defined (for
	     example, using a structure pointer without knowing its contents).

     -B path
	     Path to use when looking for the lint1 and lint2 binaries.
	     Defaults to /usr/libexec.

     -C library
	     Create a lint library with the name llib-llibrary.ln.  This
	     library is built from all .c and .ln input files.	After all
	     global definitions of functions and variables in these files are
	     written to the newly created library, lint checks all input
	     files, including libraries specified with the -l option, for
	     mutual compatibility.

     -D name[=def]
	     Define name for cpp(1), as if by a #define directive.  If no def-
	     inition is given, name is defined as 1.

     -I directory
	     Add directory to the list of directories in which to search for
	     include files.

     -d directory
	     Use directory instead of /usr/include as the default place to
	     find include files.

     -l library
	     Include the lint library llib-llibrary.ln.

     -L directory
	     Search for lint libraries in directory and directory/lint before
	     searching the standard place.

     -F      Print pathnames of files.	The lint utility normally prints the
	     filename without the path.

     -H      If a complaint stems from an included file lint prints the name
	     of the included file instead of the source file name followed by
	     a question mark.

     -o outputfile
	     Name the output file outputfile.  The output file produced is the
	     input that is given to lint's second pass.  The -o option simply
	     saves this file in the named output file.	If the -i option is
	     also used the files are not checked for compatibility.  To pro-
	     duce a llib-llibrary.ln without extraneous messages, use of the
	     -u option is suggested.  The -v option is useful if the source
	     file(s) for the lint library are just external interfaces.

     -U name
	     Remove any initial definition of name for the preprocessor.

     -V      Print the command lines constructed by the controller program to
	     run the C preprocessor and lint's first and second pass.

     -w      Treat warnings as errors.

     -X id[,id ...]
	     Suppress error messages identified by the list of ids.  A list of
	     messages and ids can be found in lint(7).

   Input Grammar
     lint's first pass reads standard C source files.  The lint utility recog-
     nizes the following C comments as commands.

     /* ARGSUSEDn */
	     makes lint check only the first n arguments for usage; a missing
	     n is taken to be 0 (this option acts like the -v option for the
	     next function).

     /* BITFIELDTYPE */
	     Suppress error messages about illegal bitfield types if the type
	     is an integer type, and suppress non-portable bitfield type warn-
	     ings.

     /* CONSTCOND */ or /* CONSTANTCOND */ or /* CONSTANTCONDITION */
	     suppress complaints about constant operands for the next expres-
	     sion.

     /* FALLTHRU */ or /* FALLTHROUGH */
	     suppress complaints about fall through to a case or default
	     labelled statement.  This directive should be placed immediately
	     preceding the label.

     /* LINTLIBRARY */
	     At the beginning of a file, mark all functions and variables
	     defined in this file as used.  Also shut off complaints about
	     unused function arguments.

     /* LINTED [comment] */ or /* NOSTRICT [comment] */
	     Suppresses any intra-file warning except those dealing with
	     unused variables or functions.  This directive should be placed
	     on the line immediately preceding where the lint warning
	     occurred.

     /* LONGLONG */
	     Suppress complaints about use of long long integer types.

     /* NOTREACHED */
	     At appropriate points, inhibit complaints about unreachable code.
	     (This comment is typically placed just after calls to functions
	     like exit(3)).

     /* PRINTFLIKEn */
	     makes lint check the first (n-1) arguments as usual.  The n-th
	     argument is interpreted as a printf(3) format string that is used
	     to check the remaining arguments.

     /* PROTOLIBn */
	     causes lint to treat function declaration prototypes as function
	     definitions if n is non-zero.  This directive can only be used in
	     conjunction with the /* LINTLIBRARY */ directive.	If n is zero,
	     function prototypes will be treated normally.

     /* SCANFLIKEn */
	     makes lint check the first (n-1) arguments as usual.  The n-th
	     argument is interpreted as a scanf(3) format string that is used
	     to check the remaining arguments.

     /* VARARGSn */
	     Suppress the usual checking for variable numbers of arguments in
	     the following function declaration.  The data types of the first
	     n arguments are checked; a missing n is taken to be 0.

     The behavior of the -i and the -o options allows for incremental use of
     lint on a set of C source files.  Generally, one invokes lint once for
     each source file with the -i option.  Each of these invocations produces
     a .ln file that corresponds to the .c file, and prints all messages that
     are about just that source file.  After all the source files have been
     separately run through lint, it is invoked once more (without the -i
     option), listing all the .ln files with the needed -l library options.
     This will print all the inter-file inconsistencies.  This scheme works
     well with make(1); it allows make(1) to be used to lint only the source
     files that have been modified since the last time the set of source files
     were linted.

ENVIRONMENT
     LIBDIR  the directory where the lint libraries specified by the
	     -l library option must exist.  If this environment variable is
	     undefined, then the default path /usr/libdata/lint will be used
	     to search for the libraries.

     TMPDIR  usually the path for temporary files can be redefined by setting
	     this environment variable.

     CC      Location of the C compiler program.  Defaults to /usr/bin/cc.

FILES
     /usr/libexec/lint[12]	   programs
     /usr/libdata/lint/llib-l*.ln  various prebuilt lint libraries
     /tmp/lint* 		   temporaries

SEE ALSO
     cc(1), cpp(1), make(1)

AUTHORS
     Jochen Pohl

BUGS
     The routines exit(3), longjmp(3) and other functions that do not return
     are not understood; this causes various incorrect diagnostics.

     Static functions which are used only before their first extern declara-
     tion are reported as unused.

     Libraries created by the -o option will, when used in later lint runs,
     cause certain errors that were reported when the libraries were created
     to be reported again, and cause line numbers and file names from the
     original source used to create those libraries to be reported in error
     messages.	For these reasons, it is recommended to use the -C option to
     create lint libraries.

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