FM / bin

/usr/bin

Name	Size	Mode	Actions
aclocal	36376	0755	edit dl rm
aclocal-1.16	36376	0755	edit dl rm
addr2line	28408	0755	edit dl rm
agentxtrap	27960	0755	edit dl rm
animate	15456	0755	edit dl rm
ar	57328	0755	edit dl rm
arch	32224	0755	edit dl rm
arpaname	15472	0755	edit dl rm
as	727360	0755	edit dl rm
aspell	154744	0755	edit dl rm
at	6009	0755	edit dl rm
atq	6011	0755	edit dl rm
atrm	6013	0755	edit dl rm
autoconf	14771	0755	edit dl rm
autoheader	8534	0755	edit dl rm
autom4te	32181	0755	edit dl rm
automake	257981	0755	edit dl rm
automake-1.16	257981	0755	edit dl rm
autoreconf	21066	0755	edit dl rm
autoscan	17124	0755	edit dl rm
autoupdate	33872	0755	edit dl rm
awk	714928	0755	edit dl rm
b2sum	52832	0755	edit dl rm
base32	36344	0755	edit dl rm
base64	36344	0755	edit dl rm
basename	32240	0755	edit dl rm
basenc	48976	0755	edit dl rm
bash	1389024	0755	edit dl rm
bashbug-64	7079	0755	edit dl rm
batch	140	0755	edit dl rm
bison	506632	0755	edit dl rm
bunzip2	40392	0755	edit dl rm
bzcat	40392	0755	edit dl rm
bzcmp	2144	0755	edit dl rm
bzdiff	2144	0755	edit dl rm
bzgrep	2058	0755	edit dl rm
bzip2	40392	0755	edit dl rm
bzip2recover	15592	0755	edit dl rm
bzless	1263	0755	edit dl rm
bzmore	1263	0755	edit dl rm
c++	1097224	0755	edit dl rm
c++filt	27840	0755	edit dl rm
c89	228	0755	edit dl rm
c99	219	0755	edit dl rm
cagefs_enter.proxied	6029	0755	edit dl rm
cal	53064	0755	edit dl rm
captoinfo	89896	0755	edit dl rm
cat	36312	0755	edit dl rm
catchsegv	3289	0755	edit dl rm
cc	1093128	0755	edit dl rm
chcon	61488	0755	edit dl rm
chgrp	57320	0755	edit dl rm
chmod	57304	0755	edit dl rm
chown	61432	0755	edit dl rm
chrt	27960	0755	edit dl rm
cksum	32136	0755	edit dl rm
cldetect	11222	0755	edit dl rm
clear	15512	0755	edit dl rm
cloudlinux-awp-user	1818	0755	edit dl rm
clwpos-user	1818	0755	edit dl rm
cmp	41096	0755	edit dl rm
col	23792	0755	edit dl rm
colcrt	15552	0755	edit dl rm
colrm	15528	0755	edit dl rm
column	36184	0755	edit dl rm
comm	36408	0755	edit dl rm
compare	15456	0755	edit dl rm
composite	15456	0755	edit dl rm
conjure	15464	0755	edit dl rm
convert	15464	0755	edit dl rm
cp	144400	0755	edit dl rm
cpan	8571	0755	edit dl rm
cpp	1097224	0755	edit dl rm
crontab	5826	0755	edit dl rm
crontab.cagefs	41440	0755	edit dl rm
csplit	111272	0755	edit dl rm
curl	254456	0755	edit dl rm
cut	44656	0755	edit dl rm
cyrusbdb2current	1651824	0755	edit dl rm
date	106336	0755	edit dl rm
dbiprof	6206	0755	edit dl rm
dd	69576	0755	edit dl rm
delv	45544	0755	edit dl rm
df	82464	0755	edit dl rm
diff	199368	0755	edit dl rm
diff3	53560	0755	edit dl rm
dig	139872	0755	edit dl rm
dir	140752	0755	edit dl rm
dircolors	40568	0755	edit dl rm
dirname	27952	0755	edit dl rm
display	15456	0755	edit dl rm
dnstap-read	23744	0755	edit dl rm
du	152848	0755	edit dl rm
echo	27944	0755	edit dl rm
ed	53768	0755	edit dl rm
egrep	32	0755	edit dl rm
enc2xs	41663	0755	edit dl rm
enchant	24296	0755	edit dl rm
enchant-lsmod	16184	0755	edit dl rm
env	45088	0755	edit dl rm
eps2eps	643	0755	edit dl rm
eqn	194064	0755	edit dl rm
ex	1452256	0755	edit dl rm
expand	40488	0755	edit dl rm
expr	111040	0755	edit dl rm
factor	73592	0755	edit dl rm
false	27936	0755	edit dl rm
fc-cache	139	0755	edit dl rm
fc-cache-64	23728	0755	edit dl rm
fc-cat	19616	0755	edit dl rm
fc-conflist	15496	0755	edit dl rm
fc-list	15496	0755	edit dl rm
fc-match	15496	0755	edit dl rm
fc-pattern	15504	0755	edit dl rm
fc-query	15496	0755	edit dl rm
fc-scan	15504	0755	edit dl rm
fc-validate	15504	0755	edit dl rm
fgrep	32	0755	edit dl rm
file	28288	0755	edit dl rm
find	291792	0755	edit dl rm
flex	422544	0755	edit dl rm
flex++	422544	0755	edit dl rm
flock	23928	0755	edit dl rm
fmt	40528	0755	edit dl rm
fold	40456	0755	edit dl rm
free	23920	0755	edit dl rm
freetype-config	4423	0755	edit dl rm
funzip	32000	0755	edit dl rm
g++	1097224	0755	edit dl rm
gawk	714928	0755	edit dl rm
gcc	1093128	0755	edit dl rm
gcc-ar	28336	0755	edit dl rm
gcc-nm	28312	0755	edit dl rm
gcc-ranlib	28336	0755	edit dl rm
gcov	488576	0755	edit dl rm
gcov-dump	298768	0755	edit dl rm
gcov-tool	328160	0755	edit dl rm
gencat	28104	0755	edit dl rm
geoiplookup	16248	0755	edit dl rm
geoiplookup6	16200	0755	edit dl rm
geqn	194064	0755	edit dl rm
GET	16200	0755	edit dl rm
getconf	36080	0755	edit dl rm
getent	36720	0755	edit dl rm
getopt	23824	0755	edit dl rm
ghostscript	15488	0755	edit dl rm
git	4397352	0755	edit dl rm
git-receive-pack	4397352	0755	edit dl rm
git-shell	826960	0755	edit dl rm
git-upload-archive	4397352	0755	edit dl rm
git-upload-pack	4397352	0755	edit dl rm
gm	16048	0755	edit dl rm
gmake	255792	0755	edit dl rm
gneqn	916	0755	edit dl rm
gnroff	3285	0755	edit dl rm
gpg	1123624	0755	edit dl rm
gpg-agent	350488	0755	edit dl rm
gpg-error	36968	0755	edit dl rm
gpgsplit	28160	0755	edit dl rm
gpgv	302520	0755	edit dl rm
gpic	206560	0755	edit dl rm
gprof	103920	0755	edit dl rm
grep	158200	0755	edit dl rm
groff	99088	0755	edit dl rm
grops	171272	0755	edit dl rm
grotty	125128	0755	edit dl rm
groups	36328	0755	edit dl rm
gs	15488	0755	edit dl rm
gsnd	281	0755	edit dl rm
gsoelim	-	0	edit dl rm
gtar	534824	0755	edit dl rm
gtbl	134000	0755	edit dl rm
gtroff	749640	0755	edit dl rm
gunzip	2350	0755	edit dl rm
gzexe	6484	0755	edit dl rm
gzip	91088	0755	edit dl rm
h2ph	29382	0755	edit dl rm
h2xs	60931	0755	edit dl rm
head	40560	0755	edit dl rm
hexdump	52640	0755	edit dl rm
host	111176	0755	edit dl rm
hostid	32224	0755	edit dl rm
hostname	24408	0755	edit dl rm
hunspell	105136	0755	edit dl rm
iconv	65624	0755	edit dl rm
icu-config	205	0755	edit dl rm
icu-config-64	22189	0755	edit dl rm
icuinfo	15864	0755	edit dl rm
id	40472	0755	edit dl rm
identify	15464	0755	edit dl rm
idn	36664	0755	edit dl rm
ifnames	4128	0755	edit dl rm
import	15456	0755	edit dl rm
infocmp	65208	0755	edit dl rm
infotocap	89896	0755	edit dl rm
install	152656	0755	edit dl rm
instmodsh	4194	0755	edit dl rm
ionice	15576	0755	edit dl rm
ipcrm	19688	0755	edit dl rm
ipcs	40280	0755	edit dl rm
isosize	15512	0755	edit dl rm
ispell	992	0755	edit dl rm
join	52928	0755	edit dl rm
kill	32032	0755	edit dl rm
ld	1791600	0755	edit dl rm
ld.bfd	1791600	0755	edit dl rm
ldd	5446	0755	edit dl rm
less	202440	0755	edit dl rm
lessecho	15536	0755	edit dl rm
lesskey	25200	0755	edit dl rm
lesspipe.sh	3580	0755	edit dl rm
lex	422544	0755	edit dl rm
libnetcfg	15775	0755	edit dl rm
libtool	367802	0755	edit dl rm
libtoolize	129200	0755	edit dl rm
link	32232	0755	edit dl rm
ln	57288	0755	edit dl rm
locale	60496	0755	edit dl rm
localedef	321584	0755	edit dl rm
logger	36840	0755	edit dl rm
login	44504	0755	edit dl rm
logname	32224	0755	edit dl rm
look	19632	0755	edit dl rm
ls	140744	0755	edit dl rm
lto-dump	27882568	0755	edit dl rm
m4	246168	0755	edit dl rm
Mail	-	0	edit dl rm
mail	-	0	edit dl rm
mailx	-	0	edit dl rm
make	255792	0755	edit dl rm
make-dummy-cert	614	0755	edit dl rm
mariadb	5246200	0755	edit dl rm
mariadb-access	111961	0755	edit dl rm
mariadb-admin	5013392	0755	edit dl rm
mariadb-binlog	5303232	0755	edit dl rm
mariadb-check	5010424	0755	edit dl rm
mariadb-conv	4731024	0755	edit dl rm
mariadb-convert-table-format	4220	0755	edit dl rm
mariadb-dump	5107000	0755	edit dl rm
mariadb-dumpslow	8242	0755	edit dl rm
mariadb-embedded	24373096	0755	edit dl rm
mariadb-find-rows	3290	0755	edit dl rm
mariadb-hotcopy	35359	0755	edit dl rm
mariadb-import	5005256	0755	edit dl rm
mariadb-plugin	4705784	0755	edit dl rm
mariadb-secure-installation	13803	0755	edit dl rm
mariadb-setpermission	17977	0755	edit dl rm
mariadb-show	5003656	0755	edit dl rm
mariadb-slap	5023200	0755	edit dl rm
mariadb-tzinfo-to-sql	4709208	0755	edit dl rm
mariadb-waitpid	4696504	0755	edit dl rm
mcookie	27960	0755	edit dl rm
md5sum	40392	0755	edit dl rm
mesg	15504	0755	edit dl rm
mkdir	69760	0755	edit dl rm
mkfifo	40592	0755	edit dl rm
mknod	44728	0755	edit dl rm
mktemp	40568	0755	edit dl rm
mogrify	15464	0755	edit dl rm
montage	15464	0755	edit dl rm
more	44464	0755	edit dl rm
msql2mysql	1450	0755	edit dl rm
mv	144328	0755	edit dl rm
mysql	5246200	0755	edit dl rm
mysqlaccess	111961	0755	edit dl rm
mysqladmin	5013392	0755	edit dl rm
mysqlbinlog	5303232	0755	edit dl rm
mysqlcheck	5010424	0755	edit dl rm
mysqldump	5107000	0755	edit dl rm
mysqlimport	5005256	0755	edit dl rm
mysqlshow	5003656	0755	edit dl rm
mysql_config	4608	0755	edit dl rm
mysql_find_rows	3290	0755	edit dl rm
mysql_waitpid	4696504	0755	edit dl rm
mytop	73757	0755	edit dl rm
my_print_defaults	4697008	0755	edit dl rm
namei	23784	0755	edit dl rm
nano	354504	0755	edit dl rm
neqn	916	0755	edit dl rm
net-snmp-create-v3-user	3371	0755	edit dl rm
nice	36336	0755	edit dl rm
nl	102920	0755	edit dl rm
nm	45792	0755	edit dl rm
nohup	36248	0755	edit dl rm
nproc	36352	0755	edit dl rm
nroff	3285	0755	edit dl rm
nslookup	115224	0755	edit dl rm
nsupdate	73528	0755	edit dl rm
numfmt	56968	0755	edit dl rm
objcopy	189816	0755	edit dl rm
objdump	423000	0755	edit dl rm
od	65408	0755	edit dl rm
openssl	1122472	0755	edit dl rm
pango-list	19568	0755	edit dl rm
pango-segmentation	19584	0755	edit dl rm
pango-view	61616	0755	edit dl rm
passwd	6017	0755	edit dl rm
paste	36240	0755	edit dl rm
patch	199696	0755	edit dl rm
pathchk	36328	0755	edit dl rm
pdf2dsc	701	0755	edit dl rm
pdf2ps	913	0755	edit dl rm
perl	15488	0755	edit dl rm
perl5.32.1	15488	0755	edit dl rm
perlbug	44863	0755	edit dl rm
perldoc	118	0755	edit dl rm
perlivp	10813	0755	edit dl rm
perlml	14840	0755	edit dl rm
perlthanks	44863	0755	edit dl rm
pgrep	32176	0755	edit dl rm
php	937	0755	edit dl rm
pic	206560	0755	edit dl rm
piconv	8271	0755	edit dl rm
ping	91472	0755	edit dl rm
pinky	36264	0755	edit dl rm
pkg-config	335	0755	edit dl rm
pkill	32176	0755	edit dl rm
pl2pm	4533	0755	edit dl rm
pmap	36240	0755	edit dl rm
pod2html	4134	0755	edit dl rm
pod2man	15034	0755	edit dl rm
pod2text	10803	0755	edit dl rm
pod2usage	4107	0755	edit dl rm
podchecker	3658	0755	edit dl rm
post-grohtml	204552	0755	edit dl rm
pr	73832	0755	edit dl rm
pre-grohtml	95152	0755	edit dl rm
precat	5660	0755	edit dl rm
preunzip	5660	0755	edit dl rm
prezip	5660	0755	edit dl rm
prezip-bin	16064	0755	edit dl rm
printenv	32040	0755	edit dl rm
printf	52816	0755	edit dl rm
prove	13562	0755	edit dl rm
ps	144536	0755	edit dl rm
ps2ascii	635	0755	edit dl rm
ps2epsi	1268	0755	edit dl rm
ps2pdf	276	0755	edit dl rm
ps2pdf12	219	0755	edit dl rm
ps2pdf13	219	0755	edit dl rm
ps2pdf14	219	0755	edit dl rm
ps2pdfwr	1082	0755	edit dl rm
ps2ps	651	0755	edit dl rm
ps2ps2	673	0755	edit dl rm
ptx	131912	0755	edit dl rm
pwd	36376	0755	edit dl rm
pwdx	15648	0755	edit dl rm
pydoc	78	0755	edit dl rm
pydoc3	78	0755	edit dl rm
pydoc3.9	78	0755	edit dl rm
ranlib	57336	0755	edit dl rm
readelf	683296	0755	edit dl rm
readlink	40456	0755	edit dl rm
realpath	40536	0755	edit dl rm
recode	32696	0755	edit dl rm
red	92	0755	edit dl rm
rename	23784	0755	edit dl rm
renew-dummy-cert	729	0755	edit dl rm
renice	15528	0755	edit dl rm
replace	4679032	0755	edit dl rm
reset	27992	0755	edit dl rm
rev	15520	0755	edit dl rm
rm	61432	0755	edit dl rm
rmdir	44464	0755	edit dl rm
rnano	354504	0755	edit dl rm
run-with-aspell	89	0755	edit dl rm
runcon	36312	0755	edit dl rm
rvi	1452256	0755	edit dl rm
rview	1452256	0755	edit dl rm
scalar	876968	0755	edit dl rm
scl	40496	0755	edit dl rm
scl_enabled	262	0755	edit dl rm
scl_source	1929	0755	edit dl rm
scp	136104	0755	edit dl rm
script	52816	0755	edit dl rm
sdiff	45264	0755	edit dl rm
sed	115544	0755	edit dl rm
selectorctl	8276	0755	edit dl rm
seq	48736	0755	edit dl rm
setsid	15512	0755	edit dl rm
setterm	36176	0755	edit dl rm
sftp	160840	0755	edit dl rm
sh	1389024	0755	edit dl rm
sha1sum	40392	0755	edit dl rm
sha224sum	40392	0755	edit dl rm
sha256sum	40392	0755	edit dl rm
sha384sum	40392	0755	edit dl rm
sha512sum	40392	0755	edit dl rm
shred	52920	0755	edit dl rm
shuf	48952	0755	edit dl rm
size	32368	0755	edit dl rm
skill	32152	0755	edit dl rm
slabtop	23984	0755	edit dl rm
sleep	32224	0755	edit dl rm
snice	32152	0755	edit dl rm
snmpconf	26051	0755	edit dl rm
soelim	-	0	edit dl rm
sort	115608	0755	edit dl rm
spell	125	0755	edit dl rm
splain	19411	0755	edit dl rm
split	53360	0755	edit dl rm
sprof	36296	0755	edit dl rm
sqlite3	1610224	0755	edit dl rm
ssh	917880	0755	edit dl rm
ssh-add	313056	0755	edit dl rm
ssh-agent	325320	0755	edit dl rm
ssh-copy-id	14174	0755	edit dl rm
ssh-keygen	486832	0755	edit dl rm
ssh-keyscan	346352	0755	edit dl rm
stat	81768	0755	edit dl rm
stdbuf	44600	0755	edit dl rm
strace	2176664	0755	edit dl rm
stream	15456	0755	edit dl rm
strings	32504	0755	edit dl rm
strip	189808	0755	edit dl rm
stty	77456	0755	edit dl rm
sum	36232	0755	edit dl rm
sync	36200	0755	edit dl rm
tabs	19624	0755	edit dl rm
tac	102808	0755	edit dl rm
tail	69536	0755	edit dl rm
tar	534824	0755	edit dl rm
taskset	23784	0755	edit dl rm
tbl	134000	0755	edit dl rm
tclsh	16064	0755	edit dl rm
tclsh8.6	16064	0755	edit dl rm
tee	36344	0755	edit dl rm
test	44664	0755	edit dl rm
tic	89896	0755	edit dl rm
timeout	36848	0755	edit dl rm
tload	19800	0755	edit dl rm
tmpwatch	36896	0755	edit dl rm
toe	23784	0755	edit dl rm
top	135448	0755	edit dl rm
touch	94048	0755	edit dl rm
tput	27904	0755	edit dl rm
tr	44728	0755	edit dl rm
troff	749640	0755	edit dl rm
true	27936	0755	edit dl rm
truncate	36328	0755	edit dl rm
tset	27992	0755	edit dl rm
tsort	48744	0755	edit dl rm
tty	32224	0755	edit dl rm
tzselect	15352	0755	edit dl rm
uapi	6013	0755	edit dl rm
ul	23816	0755	edit dl rm
uname	32232	0755	edit dl rm
unexpand	40480	0755	edit dl rm
uniq	44680	0755	edit dl rm
unlink	32224	0755	edit dl rm
unzip	200688	0755	edit dl rm
unzipsfx	89808	0755	edit dl rm
uptime	15656	0755	edit dl rm
users	32256	0755	edit dl rm
utmpdump	23768	0755	edit dl rm
vdir	140752	0755	edit dl rm
vi	1452256	0755	edit dl rm
view	146	0755	edit dl rm
vmstat	40360	0755	edit dl rm
watch	28536	0755	edit dl rm
wc	44576	0755	edit dl rm
wget	533720	0755	edit dl rm
whereis	32608	0755	edit dl rm
which	28560	0755	edit dl rm
who	52832	0755	edit dl rm
whoami	32224	0755	edit dl rm
word-list-compress	16080	0755	edit dl rm
x86_64-redhat-linux-c++	1097224	0755	edit dl rm
x86_64-redhat-linux-g++	1097224	0755	edit dl rm
x86_64-redhat-linux-gcc	1093128	0755	edit dl rm
x86_64-redhat-linux-gcc-11	1093128	0755	edit dl rm
xargs	65632	0755	edit dl rm
xmlcatalog	23712	0755	edit dl rm
xmllint	82488	0755	edit dl rm
xmlwf	40576	0755	edit dl rm
xsltproc	31984	0755	edit dl rm
xsubpp	5080	0755	edit dl rm
yes	32064	0755	edit dl rm
zcat	1988	0755	edit dl rm
zcmp	1682	0755	edit dl rm
zdiff	6451	0755	edit dl rm
zegrep	33	0755	edit dl rm
zfgrep	33	0755	edit dl rm
zforce	2085	0755	edit dl rm
zgrep	8116	0755	edit dl rm
zip	226400	0755	edit dl rm
zipcloak	77512	0755	edit dl rm
zipgrep	2957	0755	edit dl rm
zipinfo	200688	0755	edit dl rm
zipnote	69232	0755	edit dl rm
zipsplit	65104	0755	edit dl rm
zless	2210	0755	edit dl rm
zmore	1846	0755	edit dl rm
znew	4581	0755	edit dl rm
zsoelim	-	0	edit dl rm
[	52872	0755	edit dl rm

Edit: /usr/bin/aclocal-1.16 (36376B)

#!/usr/bin/perl -w
# aclocal - create aclocal.m4 by scanning configure.ac      -*- perl -*-
# Generated from bin/aclocal.in; do not edit by hand.
# Copyright (C) 1996-2020 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# Written by Tom Tromey <tromey@redhat.com>, and
# Alexandre Duret-Lutz <adl@gnu.org>.

BEGIN
{
  unshift (@INC, '/usr/share/automake-1.16')
    unless $ENV{AUTOMAKE_UNINSTALLED};
}

use strict;

use Automake::Config;
use Automake::General;
use Automake::Configure_ac;
use Automake::Channels;
use Automake::ChannelDefs;
use Automake::XFile;
use Automake::FileUtils;
use File::Basename;
use File::Path ();

# Some globals.

# Support AC_CONFIG_MACRO_DIRS also with older autoconf.
# FIXME: To be removed in Automake 2.0, once we can assume autoconf
#        2.70 or later.
# FIXME: keep in sync with 'internal/ac-config-macro-dirs.m4'.
my $ac_config_macro_dirs_fallback =
  'm4_ifndef([AC_CONFIG_MACRO_DIRS], [' .
    'm4_defun([_AM_CONFIG_MACRO_DIRS], [])' .
    'm4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])' .
  '])';

# We do not operate in threaded mode.
$perl_threads = 0;

# Include paths for searching macros.  We search macros in this order:
# user-supplied directories first, then the directory containing the
# automake macros, and finally the system-wide directories for
# third-party macros.
# @user_includes can be augmented with -I or AC_CONFIG_MACRO_DIRS.
# @automake_includes can be reset with the '--automake-acdir' option.
# @system_includes can be augmented with the 'dirlist' file or the
# ACLOCAL_PATH environment variable, and reset with the '--system-acdir'
# option.
my @user_includes = ();
my @automake_includes = ('/usr/share/aclocal-' . $APIVERSION);
my @system_includes = ('/usr/share/aclocal');

# Whether we should copy M4 file in $user_includes[0].
my $install = 0;

# --diff
my @diff_command;

# --dry-run
my $dry_run = 0;

# configure.ac or configure.in.
my $configure_ac;

# Output file name.
my $output_file = 'aclocal.m4';

# Option --force.
my $force_output = 0;

# Modification time of the youngest dependency.
my $greatest_mtime = 0;

# Which macros have been seen.
my %macro_seen = ();

# Remember the order into which we scanned the files.
# It's important to output the contents of aclocal.m4 in the opposite order.
# (Definitions in first files we have scanned should override those from
# later files.  So they must appear last in the output.)
my @file_order = ();

# Map macro names to file names.
my %map = ();

# Ditto, but records the last definition of each macro as returned by --trace.
my %map_traced_defs = ();

# Map basenames to macro names.
my %invmap = ();

# Map file names to file contents.
my %file_contents = ();

# Map file names to file types.
my %file_type = ();
use constant FT_USER => 1;
use constant FT_AUTOMAKE => 2;
use constant FT_SYSTEM => 3;

# Map file names to included files (transitively closed).
my %file_includes = ();

# Files which have already been added.
my %file_added = ();

# Files that have already been scanned.
my %scanned_configure_dep = ();

# Serial numbers, for files that have one.
# The key is the basename of the file,
# the value is the serial number represented as a list.
my %serial = ();

# Matches a macro definition.
#   AC_DEFUN([macroname], ...)
# or
#   AC_DEFUN(macroname, ...)
# When macroname is '['-quoted , we accept any character in the name,
# except ']'.  Otherwise macroname stops on the first ']', ',', ')',
# or '\n' encountered.
my $ac_defun_rx =
  "(?:AU_ALIAS|A[CU]_DEFUN|AC_DEFUN_ONCE)\\((?:\\[([^]]+)\\]|([^],)\n]+))";

# Matches an AC_REQUIRE line.
my $ac_require_rx = "AC_REQUIRE\$(?:\\[([^]]+)\\]|([^],)\n]+))\$";

# Matches an m4_include line.
my $m4_include_rx = "(m4_|m4_s|s)include\$(?:\\[([^]]+)\\]|([^],)\n]+))\$";

# Match a serial number.
my $serial_line_rx = '^#\s*serial\s+(\S*)';
my $serial_number_rx = '^\d+(?:\.\d+)*$';

# Autoconf version.  This variable is set by 'trace_used_macros'.
my $ac_version;

# User directory containing extra m4 files for macros definition,
# as extracted from calls to the macro AC_CONFIG_MACRO_DIRS.
# This variable is updated by 'trace_used_macros'.
my @ac_config_macro_dirs;

# If set, names a temporary file that must be erased on abnormal exit.
my $erase_me;

# Constants for the $ERR_LEVEL parameter of the 'scan_m4_dirs' function.
use constant SCAN_M4_DIRS_SILENT => 0;
use constant SCAN_M4_DIRS_WARN => 1;
use constant SCAN_M4_DIRS_ERROR => 2;

################################################################

# Prototypes for all subroutines.

sub add_file ($);
sub add_macro ($);
sub check_acinclude ();
sub install_file ($$);
sub list_compare (\@\@);
sub parse_ACLOCAL_PATH ();
sub parse_arguments ();
sub reset_maps ();
sub scan_configure ();
sub scan_configure_dep ($);
sub scan_file ($$$);
sub scan_m4_dirs ($$@);
sub scan_m4_files ();
sub strip_redundant_includes (%);
sub trace_used_macros ();
sub unlink_tmp (;$);
sub usage ($);
sub version ();
sub write_aclocal ($@);
sub xmkdir_p ($);

################################################################

# Erase temporary file ERASE_ME.  Handle signals.
sub unlink_tmp (;$)
{
  my ($sig) = @_;

if ($sig)
    {
      verb "caught SIG$sig, bailing out";
    }
  if (defined $erase_me && -e $erase_me && !unlink ($erase_me))
    {
      fatal "could not remove '$erase_me': $!";
    }
  undef $erase_me;

# reraise default handler.
  if ($sig)
    {
      $SIG{$sig} = 'DEFAULT';
      kill $sig => $$;
    }
}

$SIG{'INT'} = $SIG{'TERM'} = $SIG{'QUIT'} = $SIG{'HUP'} = 'unlink_tmp';
END { unlink_tmp }

sub xmkdir_p ($)
{
  my $dir = shift;
  local $@ = undef;
  return
    if -d $dir or eval { File::Path::mkpath $dir };
  chomp $@;
  $@ =~ s/\s+at\s.*\bline\s\d+.*$//;
  fatal "could not create directory '$dir': $@";
}

# Check macros in acinclude.m4.  If one is not used, warn.
sub check_acinclude ()
{
  foreach my $key (keys %map)
    {
      # FIXME: should print line number of acinclude.m4.
      msg ('syntax', "macro '$key' defined in acinclude.m4 but never used")
	if $map{$key} eq 'acinclude.m4' && ! exists $macro_seen{$key};
    }
}

sub reset_maps ()
{
  $greatest_mtime = 0;
  %macro_seen = ();
  @file_order = ();
  %map = ();
  %map_traced_defs = ();
  %file_contents = ();
  %file_type = ();
  %file_includes = ();
  %file_added = ();
  %scanned_configure_dep = ();
  %invmap = ();
  %serial = ();
  undef &search;
}

# install_file ($SRC, $DESTDIR)
sub install_file ($$)
{
  my ($src, $destdir) = @_;
  my $dest = $destdir . "/" . basename ($src);
  my $diff_dest;

verb "installing $src to $dest";

if ($force_output
      || !exists $file_contents{$dest}
      || $file_contents{$src} ne $file_contents{$dest})
    {
      if (-e $dest)
	{
	  msg 'note', "overwriting '$dest' with '$src'";
	  $diff_dest = $dest;
	}
      else
	{
	  msg 'note', "installing '$dest' from '$src'";
	}

if (@diff_command)
	{
	  if (! defined $diff_dest)
	    {
	      # $dest does not exist.  We create an empty one just to
	      # run diff, and we erase it afterward.  Using the real
	      # the destination file (rather than a temporary file) is
	      # good when diff is run with options that display the
	      # file name.
	      #
	      # If creating $dest fails, fall back to /dev/null.  At
	      # least one diff implementation (Tru64's) cannot deal
	      # with /dev/null.  However working around this is not
	      # worth the trouble since nobody run aclocal on a
	      # read-only tree anyway.
	      $erase_me = $dest;
	      my $f = new IO::File "> $dest";
	      if (! defined $f)
		{
		  undef $erase_me;
		  $diff_dest = '/dev/null';
		}
	      else
		{
		  $diff_dest = $dest;
		  $f->close;
		}
	    }
	  my @cmd = (@diff_command, $diff_dest, $src);
	  $! = 0;
	  verb "running: @cmd";
	  my $res = system (@cmd);
	  Automake::FileUtils::handle_exec_errors "@cmd", 1
	    if $res;
	  unlink_tmp;
	}
      elsif (!$dry_run)
	{
          xmkdir_p ($destdir);
	  xsystem ('cp', $src, $dest);
	}
    }
}

# Compare two lists of numbers.
sub list_compare (\@\@)
{
  my @l = @{$_[0]};
  my @r = @{$_[1]};
  while (1)
    {
      if (0 == @l)
	{
	  return (0 == @r) ? 0 : -1;
	}
      elsif (0 == @r)
	{
	  return 1;
	}
      elsif ($l[0] < $r[0])
	{
	  return -1;
	}
      elsif ($l[0] > $r[0])
	{
	  return 1;
	}
      shift @l;
      shift @r;
    }
}

################################################################

# scan_m4_dirs($TYPE, $ERR_LEVEL, @DIRS)
# -----------------------------------------------
# Scan all M4 files installed in @DIRS for new macro definitions.
# Register each file as of type $TYPE (one of the FT_* constants).
# If a directory in @DIRS cannot be read:
#  - fail hard                if $ERR_LEVEL == SCAN_M4_DIRS_ERROR
#  - just print a warning     if $ERR_LEVEL == SCAN_M4_DIRS_WA
#  - continue silently        if $ERR_LEVEL == SCAN_M4_DIRS_SILENT
sub scan_m4_dirs ($$@)
{
  my ($type, $err_level, @dirlist) = @_;

foreach my $m4dir (@dirlist)
    {
      if (! opendir (DIR, $m4dir))
	{
	  # TODO: maybe avoid complaining only if errno == ENONENT?
          my $message = "couldn't open directory '$m4dir': $!";

if ($err_level == SCAN_M4_DIRS_ERROR)
            {
              fatal $message;
            }
          elsif ($err_level == SCAN_M4_DIRS_WARN)
            {
              msg ('unsupported', $message);
              next;
            }
          elsif ($err_level == SCAN_M4_DIRS_SILENT)
            {
              next; # Silently ignore.
            }
          else
            {
               prog_error "invalid \$err_level value '$err_level'";
            }
	}

# We reverse the directory contents so that foo2.m4 gets
      # used in preference to foo1.m4.
      foreach my $file (reverse sort grep (! /^\./, readdir (DIR)))
	{
	  # Only examine .m4 files.
	  next unless $file =~ /\.m4$/;

# Skip some files when running out of srcdir.
	  next if $file eq 'aclocal.m4';

my $fullfile = File::Spec->canonpath ("$m4dir/$file");
	  scan_file ($type, $fullfile, 'aclocal');
	}
      closedir (DIR);
    }
}

# Scan all the installed m4 files and construct a map.
sub scan_m4_files ()
{
  # First, scan configure.ac.  It may contain macro definitions,
  # or may include other files that define macros.
  scan_file (FT_USER, $configure_ac, 'aclocal');

# Then, scan acinclude.m4 if it exists.
  if (-f 'acinclude.m4')
    {
      scan_file (FT_USER, 'acinclude.m4', 'aclocal');
    }

# Finally, scan all files in our search paths.

if (@user_includes)
    {
      # Don't explore the same directory multiple times.  This is here not
      # only for speedup purposes.  We need this when the user has e.g.
      # specified 'ACLOCAL_AMFLAGS = -I m4' and has also set
      # AC_CONFIG_MACRO_DIR[S]([m4]) in configure.ac.  This makes the 'm4'
      # directory to occur twice here and fail on the second call to
      # scan_m4_dirs([m4]) when the 'm4' directory doesn't exist.
      # TODO: Shouldn't there be rather a check in scan_m4_dirs for
      #       @user_includes[0]?
      @user_includes = uniq @user_includes;

# Don't complain if the first user directory doesn't exist, in case
      # we need to create it later (can happen if '--install' was given).
      scan_m4_dirs (FT_USER,
                    $install ? SCAN_M4_DIRS_SILENT : SCAN_M4_DIRS_WARN,
                    $user_includes[0]);
      scan_m4_dirs (FT_USER,
                    SCAN_M4_DIRS_ERROR,
		    @user_includes[1..$#user_includes]);
    }
  scan_m4_dirs (FT_AUTOMAKE, SCAN_M4_DIRS_ERROR, @automake_includes);
  scan_m4_dirs (FT_SYSTEM, SCAN_M4_DIRS_ERROR, @system_includes);

# Construct a new function that does the searching.  We use a
  # function (instead of just evaluating $search in the loop) so that
  # "die" is correctly and easily propagated if run.
  my $search = "sub search {\nmy \$found = 0;\n";
  foreach my $key (reverse sort keys %map)
    {
      $search .= ('if (/\b\Q' . $key . '\E(?!\w)/) { add_macro ("' . $key
		  . '"); $found = 1; }' . "\n");
    }
  $search .= "return \$found;\n};\n";
  eval $search;
  prog_error "$@\n search is $search" if $@;
}

################################################################

# Add a macro to the output.
sub add_macro ($)
{
  my ($macro) = @_;

# Ignore unknown required macros.  Either they are not really
  # needed (e.g., a conditional AC_REQUIRE), in which case aclocal
  # should be quiet, or they are needed and Autoconf itself will
  # complain when we trace for macro usage later.
  return unless defined $map{$macro};

verb "saw macro $macro";
  $macro_seen{$macro} = 1;
  add_file ($map{$macro});
}

# scan_configure_dep ($file)
# --------------------------
# Scan a configure dependency (configure.ac, or separate m4 files)
# for uses of known macros and AC_REQUIREs of possibly unknown macros.
# Recursively scan m4_included files.
sub scan_configure_dep ($)
{
  my ($file) = @_;
  # Do not scan a file twice.
  return ()
    if exists $scanned_configure_dep{$file};
  $scanned_configure_dep{$file} = 1;

my $mtime = mtime $file;
  $greatest_mtime = $mtime if $greatest_mtime < $mtime;

my $contents = exists $file_contents{$file} ?
    $file_contents{$file} : contents $file;

my $line = 0;
  my @rlist = ();
  my @ilist = ();
  foreach (split ("\n", $contents))
    {
      ++$line;
      # Remove comments from current line.
      s/\bdnl\b.*$//;
      s/\#.*$//;
      # Avoid running all the following regexes on white lines.
      next if /^\s*$/;

while (/$m4_include_rx/go)
	{
	  my $ifile = $2 || $3;
	  # Skip missing 'sinclude'd files.
	  next if $1 ne 'm4_' && ! -f $ifile;
	  push @ilist, $ifile;
	}

while (/$ac_require_rx/go)
	{
	  push (@rlist, $1 || $2);
	}

# The search function is constructed dynamically by
      # scan_m4_files.  The last parenthetical match makes sure we
      # don't match things that look like macro assignments or
      # AC_SUBSTs.
      if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
	{
	  # Macro not found, but AM_ prefix found.
	  # Make this just a warning, because we do not know whether
	  # the macro is actually used (it could be called conditionally).
	  msg ('unsupported', "$file:$line",
	       "macro '$2' not found in library");
	}
    }

add_macro ($_) foreach (@rlist);
  scan_configure_dep ($_) foreach @ilist;
}

# add_file ($FILE)
# ----------------
# Add $FILE to output.
sub add_file ($)
{
  my ($file) = @_;

# Only add a file once.
  return if ($file_added{$file});
  $file_added{$file} = 1;

scan_configure_dep $file;
}

# Point to the documentation for underquoted AC_DEFUN only once.
my $underquoted_manual_once = 0;

# scan_file ($TYPE, $FILE, $WHERE)
# --------------------------------
# Scan a single M4 file ($FILE), and all files it includes.
# Return the list of included files.
# $TYPE is one of FT_USER, FT_AUTOMAKE, or FT_SYSTEM, depending
# on where the file comes from.
# $WHERE is the location to use in the diagnostic if the file
# does not exist.
sub scan_file ($$$)
{
  my ($type, $file, $where) = @_;
  my $basename = basename $file;

# Do not scan the same file twice.
  return @{$file_includes{$file}} if exists $file_includes{$file};
  # Prevent potential infinite recursion (if two files include each other).
  return () if exists $file_contents{$file};

unshift @file_order, $file;

$file_type{$file} = $type;

fatal "$where: file '$file' does not exist" if ! -e $file;

my $fh = new Automake::XFile $file;
  my $contents = '';
  my @inc_files = ();
  my %inc_lines = ();

my $defun_seen = 0;
  my $serial_seen = 0;
  my $serial_older = 0;

while ($_ = $fh->getline)
    {
      # Ignore '##' lines.
      next if /^##/;

$contents .= $_;
      my $line = $_;

if ($line =~ /$serial_line_rx/go)
	{
	  my $number = $1;
	  if ($number !~ /$serial_number_rx/go)
	    {
	      msg ('syntax', "$file:$.",
		   "ill-formed serial number '$number', "
		   . "expecting a version string with only digits and dots");
	    }
	  elsif ($defun_seen)
	    {
	      # aclocal removes all definitions from M4 file with the
	      # same basename if a greater serial number is found.
	      # Encountering a serial after some macros will undefine
	      # these macros...
	      msg ('syntax', "$file:$.",
		   'the serial number must appear before any macro definition');
	    }
	  # We really care about serials only for non-automake macros
	  # and when --install is used.  But the above diagnostics are
	  # made regardless of this, because not using --install is
	  # not a reason not the fix macro files.
	  elsif ($install && $type != FT_AUTOMAKE)
	    {
	      $serial_seen = 1;
	      my @new = split (/\./, $number);

verb "$file:$.: serial $number";

if (!exists $serial{$basename}
		  || list_compare (@new, @{$serial{$basename}}) > 0)
		{
		  # Delete any definition we knew from the old macro.
		  foreach my $def (@{$invmap{$basename}})
		    {
		      verb "$file:$.: ignoring previous definition of $def";
		      delete $map{$def};
		    }
		  $invmap{$basename} = [];
		  $serial{$basename} = \@new;
		}
	      else
		{
		  $serial_older = 1;
		}
	    }
	}

# Remove comments from current line.
      # Do not do it earlier, because the serial line is a comment.
      $line =~ s/\bdnl\b.*$//;
      $line =~ s/\#.*$//;

while ($line =~ /$ac_defun_rx/go)
	{
	  $defun_seen = 1;
	  if (! defined $1)
	    {
	      msg ('syntax', "$file:$.", "underquoted definition of $2"
		   . "\n  run info Automake 'Extending aclocal'\n"
		   . "  or see https://www.gnu.org/software/automake/manual/"
		   . "automake.html#Extending-aclocal")
		unless $underquoted_manual_once;
	      $underquoted_manual_once = 1;
	    }

# If this macro does not have a serial and we have already
	  # seen a macro with the same basename earlier, we should
	  # ignore the macro (don't exit immediately so we can still
	  # diagnose later #serial numbers and underquoted macros).
	  $serial_older ||= ($type != FT_AUTOMAKE
			     && !$serial_seen && exists $serial{$basename});

my $macro = $1 || $2;
	  if (!$serial_older && !defined $map{$macro})
	    {
	      verb "found macro $macro in $file: $.";
	      $map{$macro} = $file;
	      push @{$invmap{$basename}}, $macro;
	    }
	  else
	    {
	      # Note: we used to give an error here if we saw a
	      # duplicated macro.  However, this turns out to be
	      # extremely unpopular.  It causes actual problems which
	      # are hard to work around, especially when you must
	      # mix-and-match tool versions.
	      verb "ignoring macro $macro in $file: $.";
	    }
	}

while ($line =~ /$m4_include_rx/go)
	{
	  my $ifile = $2 || $3;
	  # Skip missing 'sinclude'd files.
	  next if $1 ne 'm4_' && ! -f $ifile;
	  push (@inc_files, $ifile);
	  $inc_lines{$ifile} = $.;
	}
    }

# Ignore any file that has an old serial (or no serial if we know
  # another one with a serial).
  return ()
    if ($serial_older ||
	($type != FT_AUTOMAKE && !$serial_seen && exists $serial{$basename}));

$file_contents{$file} = $contents;

# For some reason I don't understand, it does not work
  # to do "map { scan_file ($_, ...) } @inc_files" below.
  # With Perl 5.8.2 it undefines @inc_files.
  my @copy = @inc_files;
  my @all_inc_files = (@inc_files,
		       map { scan_file ($type, $_,
					"$file:$inc_lines{$_}") } @copy);
  $file_includes{$file} = \@all_inc_files;
  return @all_inc_files;
}

# strip_redundant_includes (%FILES)
# ---------------------------------
# Each key in %FILES is a file that must be present in the output.
# However some of these files might already include other files in %FILES,
# so there is no point in including them another time.
# This removes items of %FILES which are already included by another file.
sub strip_redundant_includes (%)
{
  my %files = @_;

# Always include acinclude.m4, even if it does not appear to be used.
  $files{'acinclude.m4'} = 1 if -f 'acinclude.m4';
  # File included by $configure_ac are redundant.
  $files{$configure_ac} = 1;

# Files at the end of @file_order should override those at the beginning,
  # so it is important to preserve these trailing files.  We can remove
  # a file A if it is going to be output before a file B that includes
  # file A, not the converse.
  foreach my $file (reverse @file_order)
    {
      next unless exists $files{$file};
      foreach my $ifile (@{$file_includes{$file}})
	{
	  next unless exists $files{$ifile};
	  delete $files{$ifile};
	  verb "$ifile is already included by $file";
	}
    }

# configure.ac is implicitly included.
  delete $files{$configure_ac};

return %files;
}

sub trace_used_macros ()
{
  my %files = map { $map{$_} => 1 } keys %macro_seen;
  %files = strip_redundant_includes %files;

# When AC_CONFIG_MACRO_DIRS is used, avoid possible spurious warnings
  # from autom4te about macros being "m4_require'd but not m4_defun'd";
  # for more background, see:
  # https://lists.gnu.org/archive/html/autoconf-patches/2012-11/msg00004.html
  # as well as autoconf commit 'v2.69-44-g1ed0548', "warn: allow aclocal
  # to silence m4_require warnings".
  my $early_m4_code .= "m4_define([m4_require_silent_probe], [-])";

my $traces = ($ENV{AUTOM4TE} || 'autom4te');
  $traces .= " --language Autoconf-without-aclocal-m4 ";
  $traces = "echo '$early_m4_code' | $traces - ";

# Support AC_CONFIG_MACRO_DIRS also with older autoconf.
  # Note that we can't use '$ac_config_macro_dirs_fallback' here, because
  # a bug in option parsing code of autom4te 2.68 and earlier will cause
  # it to read standard input last, even if the "-" argument is specified
  # early.
  # FIXME: To be removed in Automake 2.0, once we can assume autoconf
  #        2.70 or later.
  $traces .= "$automake_includes[0]/internal/ac-config-macro-dirs.m4 ";

# All candidate files.
  $traces .= join (' ',
		   (map { "'$_'" }
		    (grep { exists $files{$_} } @file_order))) . " ";

# All candidate macros.
  $traces .= join (' ',
		   (map { "--trace='$_:\$f::\$n::\${::}%'" }
		    ('AC_DEFUN',
		     'AC_DEFUN_ONCE',
		     'AU_DEFUN',
		     '_AM_AUTOCONF_VERSION',
		     'AC_CONFIG_MACRO_DIR_TRACE',
                     # FIXME: Tracing the next two macros is a hack for
                     # compatibility with older autoconf.  Remove this in
                     # Automake 2.0, when we can assume Autoconf 2.70 or
                     # later.
		     'AC_CONFIG_MACRO_DIR',
		     '_AM_CONFIG_MACRO_DIRS')),
		   # Do not trace $1 for all other macros as we do
		   # not need it and it might contains harmful
		   # characters (like newlines).
		   (map { "--trace='$_:\$f::\$n'" } (keys %macro_seen)));

verb "running $traces $configure_ac";

my $tracefh = new Automake::XFile ("$traces $configure_ac |");

@ac_config_macro_dirs = ();

my %traced = ();

while ($_ = $tracefh->getline)
    {
      chomp;
      my ($file, $macro, $arg1) = split (/::/);

$traced{$macro} = 1 if exists $macro_seen{$macro};

if ($macro eq 'AC_DEFUN' || $macro eq 'AC_DEFUN_ONCE'
            || $macro eq 'AU_DEFUN')
        {
          $map_traced_defs{$arg1} = $file;
        }
      elsif ($macro eq '_AM_AUTOCONF_VERSION')
        {
          $ac_version = $arg1;
        }
      elsif ($macro eq 'AC_CONFIG_MACRO_DIR_TRACE')
        {
          push @ac_config_macro_dirs, $arg1;
        }
      # FIXME: We still need to trace AC_CONFIG_MACRO_DIR
      # for compatibility with older autoconf.  Remove this
      # once we can assume Autoconf 2.70 or later.
      elsif ($macro eq 'AC_CONFIG_MACRO_DIR')
        {
          @ac_config_macro_dirs = ($arg1);
        }
      # FIXME:This is an hack for compatibility with older autoconf.
      # Remove this once we can assume Autoconf 2.70 or later.
      elsif ($macro eq '_AM_CONFIG_MACRO_DIRS')
        {
           # Empty leading/trailing fields might be produced by split,
           # hence the grep is really needed.
           push @ac_config_macro_dirs, grep (/./, (split /\s+/, $arg1));
        }
    }

# FIXME: in Autoconf >= 2.70, AC_CONFIG_MACRO_DIR calls
  # AC_CONFIG_MACRO_DIR_TRACE behind the scenes, which could
  # leave unwanted duplicates in @ac_config_macro_dirs.
  # Remove this in Automake 2.0, when we'll stop tracing
  # AC_CONFIG_MACRO_DIR explicitly.
  @ac_config_macro_dirs = uniq @ac_config_macro_dirs;

$tracefh->close;

return %traced;
}

sub scan_configure ()
{
  # Make sure we include acinclude.m4 if it exists.
  if (-f 'acinclude.m4')
    {
      add_file ('acinclude.m4');
    }
  scan_configure_dep ($configure_ac);
}

################################################################

# Write output.
# Return 0 iff some files were installed locally.
sub write_aclocal ($@)
{
  my ($output_file, @macros) = @_;
  my $output = '';

my %files = ();
  # Get the list of files containing definitions for the macros used.
  # (Filter out unused macro definitions with $map_traced_defs.  This
  # can happen when an Autoconf macro is conditionally defined:
  # aclocal sees the potential definition, but this definition is
  # actually never processed and the Autoconf implementation is used
  # instead.)
  for my $m (@macros)
    {
      $files{$map{$m}} = 1
	if (exists $map_traced_defs{$m}
	    && $map{$m} eq $map_traced_defs{$m});
    }
  # Do not explicitly include a file that is already indirectly included.
  %files = strip_redundant_includes %files;

my $installed = 0;

for my $file (grep { exists $files{$_} } @file_order)
    {
      # Check the time stamp of this file, and of all files it includes.
      for my $ifile ($file, @{$file_includes{$file}})
	{
	  my $mtime = mtime $ifile;
	  $greatest_mtime = $mtime if $greatest_mtime < $mtime;
	}

# If the file to add looks like outside the project, copy it
      # to the output.  The regex catches filenames starting with
      # things like '/', '\', or 'c:\'.
      if ($file_type{$file} != FT_USER
	  || $file =~ m,^(?:\w:)?[\\/],)
	{
	  if (!$install || $file_type{$file} != FT_SYSTEM)
	    {
	      # Copy the file into aclocal.m4.
	      $output .= $file_contents{$file} . "\n";
	    }
	  else
	    {
	      # Install the file (and any file it includes).
	      my $dest;
	      for my $ifile (@{$file_includes{$file}}, $file)
		{
		  install_file ($ifile, $user_includes[0]);
		}
	      $installed = 1;
	    }
	}
      else
	{
	  # Otherwise, simply include the file.
	  $output .= "m4_include([$file])\n";
	}
    }

if ($installed)
    {
      verb "running aclocal anew, because some files were installed locally";
      return 0;
    }

# Nothing to output?!
  # FIXME: Shouldn't we diagnose this?
  return 1 if ! length ($output);

if ($ac_version)
    {
      # Do not use "$output_file" here for the same reason we do not
      # use it in the header below.  autom4te will output the name of
      # the file in the diagnostic anyway.
      $output = "m4_ifndef([AC_AUTOCONF_VERSION],
  [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
m4_if(m4_defn([AC_AUTOCONF_VERSION]), [$ac_version],,
[m4_warning([this file was generated for autoconf $ac_version.
You have another version of autoconf.  It may work, but is not guaranteed to.
If you have problems, you may need to regenerate the build system entirely.
To do so, use the procedure documented by the package, typically 'autoreconf'.])])

$output";
    }

# We used to print "# $output_file generated automatically etc."  But
  # this creates spurious differences when using autoreconf.  Autoreconf
  # creates aclocal.m4t and then rename it to aclocal.m4, but the
  # rebuild rules generated by Automake create aclocal.m4 directly --
  # this would gives two ways to get the same file, with a different
  # name in the header.
  $output = "# generated automatically by aclocal $VERSION -*- Autoconf -*-

# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

$ac_config_macro_dirs_fallback
$output";

# We try not to update $output_file unless necessary, because
  # doing so invalidate Autom4te's cache and therefore slows down
  # tools called after aclocal.
  #
  # We need to overwrite $output_file in the following situations.
  #   * The --force option is in use.
  #   * One of the dependencies is younger.
  #     (Not updating $output_file in this situation would cause
  #     make to call aclocal in loop.)
  #   * The contents of the current file are different from what
  #     we have computed.
  if (!$force_output
      && $greatest_mtime < mtime ($output_file)
      && $output eq contents ($output_file))
    {
      verb "$output_file unchanged";
      return 1;
    }

verb "writing $output_file";

if (!$dry_run)
    {
      if (-e $output_file && !unlink $output_file)
        {
	  fatal "could not remove '$output_file': $!";
	}
      my $out = new Automake::XFile "> $output_file";
      print $out $output;
    }
  return 1;
}

################################################################

# Print usage and exit.
sub usage ($)
{
  my ($status) = @_;

print <<'EOF';
Usage: aclocal [OPTION]...

Generate 'aclocal.m4' by scanning 'configure.ac' or 'configure.in'

Options:
      --automake-acdir=DIR  directory holding automake-provided m4 files
      --system-acdir=DIR    directory holding third-party system-wide files
      --diff[=COMMAND]      run COMMAND [diff -u] on M4 files that would be
                            changed (implies --install and --dry-run)
      --dry-run             pretend to, but do not actually update any file
      --force               always update output file
      --help                print this help, then exit
  -I DIR                    add directory to search list for .m4 files
      --install             copy third-party files to the first -I directory
      --output=FILE         put output in FILE (default aclocal.m4)
      --print-ac-dir        print name of directory holding system-wide
                              third-party m4 files, then exit
      --verbose             don't be silent
      --version             print version number, then exit
  -W, --warnings=CATEGORY   report the warnings falling in CATEGORY

Warning categories include:
  syntax        dubious syntactic constructs (default)
  unsupported   unknown macros (default)
  all           all the warnings (default)
  no-CATEGORY   turn off warnings in CATEGORY
  none          turn off all the warnings
  error         treat warnings as errors

Report bugs to <bug-automake@gnu.org>.
GNU Automake home page: <http://www.gnu.org/software/automake/>.
General help using GNU software: <https://www.gnu.org/gethelp/>.
EOF
  exit $status;
}

# Print version and exit.
sub version ()
{
  print <<EOF;
aclocal (GNU $PACKAGE) $VERSION
Copyright (C) $RELEASE_YEAR Free Software Foundation, Inc.
License GPLv2+: GNU GPL version 2 or later <https://gnu.org/licenses/gpl-2.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Tom Tromey <tromey\@redhat.com>
       and Alexandre Duret-Lutz <adl\@gnu.org>.
EOF
  exit 0;
}

# Parse command line.
sub parse_arguments ()
{
  my $print_and_exit = 0;
  my $diff_command;

my %cli_options =
    (
     'help'		=> sub { usage(0); },
     'version'		=> \&version,
     'system-acdir=s'	=> sub { shift; @system_includes = @_; },
     'automake-acdir=s'	=> sub { shift; @automake_includes = @_; },
     'diff:s'		=> \$diff_command,
     'dry-run'		=> \$dry_run,
     'force'		=> \$force_output,
     'I=s'		=> \@user_includes,
     'install'          => \$install,
     'output=s'		=> \$output_file,
     'print-ac-dir'     => \$print_and_exit,
     'verbose'		=> sub { setup_channel 'verb', silent => 0; },
     'W|warnings=s'     => \&parse_warnings,
     );

use Automake::Getopt ();
  Automake::Getopt::parse_options %cli_options;

if (@ARGV > 0)
    {
      fatal ("non-option arguments are not accepted: '$ARGV[0]'.\n"
             . "Try '$0 --help' for more information.");
    }

if ($print_and_exit)
    {
      print "@system_includes\n";
      exit 0;
    }

if (defined $diff_command)
    {
      $diff_command = 'diff -u' if $diff_command eq '';
      @diff_command = split (' ', $diff_command);
      $install = 1;
      $dry_run = 1;
    }

# Finally, adds any directory listed in the 'dirlist' file.
  if (@system_includes && open (DIRLIST, "$system_includes[0]/dirlist"))
    {
      while (<DIRLIST>)
        {
          # Ignore '#' lines.
          next if /^#/;
          # strip off newlines and end-of-line comments
          s/\s*\#.*$//;
          chomp;
          foreach my $dir (glob)
            {
              push (@system_includes, $dir) if -d $dir;
            }
        }
      close (DIRLIST);
    }
}

# Add any directory listed in the 'ACLOCAL_PATH' environment variable
# to the list of system include directories.
sub parse_ACLOCAL_PATH ()
{
  return if not defined $ENV{"ACLOCAL_PATH"};
  # Directories in ACLOCAL_PATH should take precedence over system
  # directories, so we use unshift.  However, directories that
  # come first in ACLOCAL_PATH take precedence over directories
  # coming later, which is why the result of split is reversed.
  foreach my $dir (reverse split /:/, $ENV{"ACLOCAL_PATH"})
    {
      unshift (@system_includes, $dir) if $dir ne '' && -d $dir;
    }
}

################################################################

# Don't refer to installation directories from the build environment
if (exists $ENV{"AUTOMAKE_UNINSTALLED"})
  {
    @automake_includes = ();
    @system_includes = ();
  }

@automake_includes = ($ENV{"ACLOCAL_AUTOMAKE_DIR"})
  if (exists $ENV{"ACLOCAL_AUTOMAKE_DIR"});

parse_WARNINGS;		    # Parse the WARNINGS environment variable.
parse_arguments;
parse_ACLOCAL_PATH;
$configure_ac = require_configure_ac;

# We may have to rerun aclocal if some file have been installed, but
# it should not happen more than once.  The reason we must run again
# is that once the file has been moved from /usr/share/aclocal/ to the
# local m4/ directory it appears at a new place in the search path,
# hence it should be output at a different position in aclocal.m4.  If
# we did not rerun aclocal, the next run of aclocal would produce a
# different aclocal.m4.
my $loop = 0;
my $rerun_due_to_macrodir = 0;
while (1)
  {
    ++$loop;
    prog_error "too many loops" if $loop > 2 + $rerun_due_to_macrodir;

reset_maps;
    scan_m4_files;
    scan_configure;
    last if $exit_code;
    my %macro_traced = trace_used_macros;

if (!$rerun_due_to_macrodir && @ac_config_macro_dirs)
      {
        # The directory specified in calls to the AC_CONFIG_MACRO_DIRS
        # m4 macro (if any) must go after the user includes specified
        # explicitly with the '-I' option.
        push @user_includes, @ac_config_macro_dirs;
        # We might have to scan some new directory of .m4 files.
        $rerun_due_to_macrodir++;
        next;
      }

if ($install && !@user_includes)
      {
        fatal "installation of third-party macros impossible without " .
              "-I options nor AC_CONFIG_MACRO_DIR{,S} m4 macro(s)";
      }

last if write_aclocal ($output_file, keys %macro_traced);
    last if $dry_run;
  }
check_acinclude;

exit $exit_code;

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