Simplify handling of autotest tracing

[autoconf.git] / lib / autotest / general.m4

# This file is part of Autoconf.                          -*- Autoconf -*-
# M4 macros used in building test suites.
m4_define([_AT_COPYRIGHT_YEARS],
[Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
2009 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# are the output of Autoconf.  You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of Autoconf appear in them.  The GNU
# General Public License (GPL) does govern all other use of the material
# that constitutes the Autoconf program.
#
# Certain portions of the Autoconf source text are designed to be copied
# (in certain cases, depending on the input) into the output of
# Autoconf.  We call these the "data" portions.  The rest of the Autoconf
# source text consists of comments plus executable code that decides which
# of the data portions to output in any given case.  We call these
# comments and executable code the "non-data" portions.  Autoconf never
# copies any of the non-data portions into its output.
#
# This special exception to the GPL applies to versions of Autoconf
# released by the Free Software Foundation.  When you make and
# distribute a modified version of Autoconf, you may extend this special
# exception to the GPL to apply to your modified version as well, *unless*
# your modified version has the potential to copy into its output some
# of the text that was the non-data portion of the version that you started
# with.  (In other words, unless your change moves or copies text from
# the non-data portions to the data portions.)  If your modification has
# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.

# _m4_divert(DIVERSION-NAME)
# --------------------------
# Convert a diversion name into its number.  Otherwise, return
# DIVERSION-NAME which is supposed to be an actual diversion number.
# Of course it would be nicer to use m4_case here, instead of zillions
# of little macros, but it then takes twice longer to run `autoconf'!
#
# From M4sugar:
#    -1. KILL
# 10000. GROW
#
# From M4sh:
#    0. BINSH
#    1. HEADER-REVISION
#    2. HEADER-COMMENT
#    3. HEADER-COPYRIGHT
#    4. M4SH-SANITIZE
#    5. M4SH-INIT
# 1000. BODY
#
# Defined below:
#  - DEFAULTS
#    Overall initialization, value of $at_groups_all.
#  - PARSE_ARGS_BEGIN
#    Setup defaults required for option processing.
#  - PARSE_ARGS
#    Option processing.  After AT_INIT, user options can be entered here as
#    cases of a case statement.
#  - PARSE_ARGS_END
#    Finish up the option processing.
#
#  - HELP
#    Start printing the help message.
#  - HELP_MODES
#    Modes help text.  Additional modes can be appended as self-contained
#    cat'd here-docs as generated by AS_HELP_STRING.
#  - HELP_TUNING
#    Tuning help text.  Additional tuning options can be appended as
#    self-contained cat'd here-docs as generated by AS_HELP_STRING.
#  - HELP_OTHER
#    User help can be appended to this as self-contained cat'd here-docs.
#  - HELP_END
#    Finish up the help texts.
#
#  - VERSION
#    Head of the handling of --version.
#  - VERSION_NOTICES
#    Copyright notices for --version.
#  - VERSION_END
#    Tail of the handling of --version.
#
#  - BANNERS
#    Output shell initialization for the associative array of banner text.
#  - TESTS_BEGIN
#    Like DEFAULTS but run after argument processing for purposes of
#    optimization.  Do anything else that needs to be done to prepare for
#    tests.  Sets up verbose and log file descriptors.  Sets and logs PATH.
#  - PREPARE_TESTS
#    Declares functions shared among the tests.  Perform any user
#    initialization to be shared among all tests.
#  - TESTS
#    The core of the test suite.
#
#  - TEST_SCRIPT
#    The collector for code for each test, the ``normal'' diversion, but
#    undiverted into other locations before final output.
#
#  - TEST_GROUPS
#    Contents of each test group.  The tests deliberately occur after the
#    end of the shell script, so that the shell need not spend time parsing
#    commands it will not execute.

m4_define([_m4_divert(DEFAULTS)],           100)
m4_define([_m4_divert(PARSE_ARGS_BEGIN)],   200)
m4_define([_m4_divert(PARSE_ARGS)],         201)
m4_define([_m4_divert(PARSE_ARGS_END)],     202)
m4_define([_m4_divert(HELP)],               300)
m4_define([_m4_divert(HELP_MODES)],         301)
m4_define([_m4_divert(HELP_TUNING)],        302)
m4_define([_m4_divert(HELP_OTHER)],         303)
m4_define([_m4_divert(HELP_END)],           304)
m4_define([_m4_divert(VERSION)],            350)
m4_define([_m4_divert(VERSION_NOTICES)],    351)
m4_define([_m4_divert(VERSION_END)],        352)
m4_define([_m4_divert(BANNERS)],            400)
m4_define([_m4_divert(TESTS_BEGIN)],        401)
m4_define([_m4_divert(PREPARE_TESTS)],      402)
m4_define([_m4_divert(TESTS)],              403)
m4_define([_m4_divert(TEST_SCRIPT)],        450)
m4_define([_m4_divert(TEST_GROUPS)],        500)


# AT_LINE
# -------
# Return the current file sans directory, a colon, and the current
# line.  Be sure to return a _quoted_ file name, so if, for instance,
# the user is lunatic enough to have a file named `dnl' (and I, for
# one, love to be brainless and stubborn sometimes), then we return a
# quoted name.
#
# Gee, we can't use simply
#
#  m4_bpatsubst(__file__, [^.*/\(.*\)], [[\1]])
#
# since then, since `dnl' doesn't match the pattern, it is returned
# with once quotation level less, so you lose!  And since GNU M4
# is one of the biggest junk in the whole universe wrt regexp, don't
# even think about using `?' or `\?'.  Bah, `*' will do.
# Pleeeeeeeease, Gary, provide us with dirname and ERE!
#
# M4 recompiles the regular expression for every m4_bpatsubst, but __file__
# rarely changes.  Be fast - only compute the dirname when necessary; for
# autoconf alone, this shaves off several seconds in building testsuite.
m4_define([_AT_LINE_file])
m4_define([_AT_LINE_base])
m4_define([AT_LINE],
[m4_if(m4_defn([_AT_LINE_file]), __file__, [],
       [m4_do([m4_define([_AT_LINE_file], __file__)],
              [m4_define([_AT_LINE_base],
                         m4_bregexp(/__file__, [/\([^/]*\)$], [[\1]]))])])dnl
m4_defn([_AT_LINE_base]):__line__])


# _AT_NORMALIZE_TEST_GROUP_NUMBER(SHELL-VAR)
# ------------------------------------------
# Normalize SHELL-VAR so that its value has the same number of digits as
# all the other test group numbers.
m4_define([_AT_NORMALIZE_TEST_GROUP_NUMBER],
[
  eval 'while :; do
    case $$1 in #(
    '"$at_format"'*) break;;
    esac
    $1=0$$1
  done'
])

# _AT_DEFINE_INIT(NAME, [DEFINITION])
# -----------------------------------
# Define macro NAME to die if invoked prior to AT_INIT, and to DEFINITION
# after AT_INIT.
m4_define([_AT_DEFINE_INIT],
[m4_define($@)m4_pushdef([$1], [m4_fatal([$1: missing AT_INIT detected])])dnl
m4_append([_AT_DEFINE_INIT_LIST], [[$1]], [,])])

# _AT_DEFINE_SETUP(NAME, [DEFINITION])
# -----------------------------------
# Define macro NAME to die if invoked outside AT_SETUP/AT_CLEANUP, and
# to DEFINITION otherwise.
m4_define([_AT_DEFINE_SETUP],
[m4_define([$1], [m4_ifndef([AT_ingroup],
 [m4_fatal([$1: missing AT_SETUP detected])])$2])])


# AT_INIT([TESTSUITE-NAME])
# -------------------------
# Begin test suite.
m4_define([AT_INIT],
[m4_pushdef([AT_INIT], [m4_fatal([$0: invoked multiple times])])]
[m4_pattern_forbid([^_?AT_])]
[m4_pattern_allow([^_ATEOF$])]
[m4_ifndef([AT_PACKAGE_BUGREPORT], [m4_fatal(
  [$1: AT_PACKAGE_BUGREPORT is missing, consider writing package.m4])])]
[m4_define([AT_TESTSUITE_NAME],
  m4_defn([AT_PACKAGE_STRING])[ test suite]m4_ifval([$1],
   [m4_expand([: $1])]))]
[m4_define([AT_ordinal], 0)]
[m4_define([AT_banner_ordinal], 0)]
[m4_define([AT_groups_all], [])]
[m4_define([AT_help_all], [])]
[m4_map_args([_m4_popdef], _AT_DEFINE_INIT_LIST)]
[m4_wrap([_AT_FINISH])]
[AS_INIT[]]dnl
dnl We don't use m4sh's BODY diversion, but AS_INIT sticks a banner there.
dnl This trick removes that banner, since it adds nothing to autotest.
[m4_cleardivert([BODY])]dnl
[AS_ME_PREPARE[]]dnl
[m4_divert_push([DEFAULTS])]dnl
[AT_COPYRIGHT(m4_defn([_AT_COPYRIGHT_YEARS]), [
m4_copyright_condense])]
[AT_COPYRIGHT(
[This test suite is free software; the Free Software Foundation gives
unlimited permission to copy, distribute and modify it.], [m4_echo])]
[AS_PREPARE

SHELL=${CONFIG_SHELL-/bin/sh}

# How were we run?
at_cli_args="$[@]"

m4_divert_push([BANNERS])dnl

# Should we print banners?  at_groups is space-separated for entire test,
# newline-separated if only a subset of the testsuite is run.
case $at_groups in
  *' '*' '* | *"$as_nl"*"$as_nl"* )
      at_print_banners=: ;;
  * ) at_print_banners=false ;;
esac
# Text for banner N, set to empty once printed.
m4_divert_pop([BANNERS])dnl back to DEFAULTS
m4_divert_push([PREPARE_TESTS])dnl

m4_text_box([Autotest shell functions.])

AS_FUNCTION_DESCRIBE([at_fn_banner], [NUMBER],
[Output banner NUMBER, provided the testsuite is running multiple groups
and this particular banner has not yet been printed.])
at_fn_banner ()
{
  $at_print_banners || return 0
  eval at_banner_text=\$at_banner_text_$[1]
  test "x$at_banner_text" = x && return 0
  eval at_banner_text_$[1]=
  AS_ECHO(["$as_nl$at_banner_text$as_nl"])
} # at_fn_banner

AS_FUNCTION_DESCRIBE([at_fn_check_prepare_notrace], [REASON LINE],
[Perform AT_CHECK preparations for the command at LINE for an
untraceable command; REASON is the reason for disabling tracing.])
at_fn_check_prepare_notrace ()
{
  $at_trace_echo "Not enabling shell tracing (command contains $1)"
  AS_ECHO(["$[2]"]) >"$at_check_line_file"
  at_check_trace=: at_check_filter=:
  : >"$at_stdout"; : >"$at_stderr"
}

AS_FUNCTION_DESCRIBE([at_fn_check_prepare_trace], [LINE],
[Perform AT_CHECK preparations for the command at LINE for a traceable
command.])
at_fn_check_prepare_trace ()
{
  AS_ECHO(["$[1]"]) >"$at_check_line_file"
  at_check_trace=$at_traceon at_check_filter=$at_check_filter_trace
  : >"$at_stdout"; : >"$at_stderr"
}

AS_FUNCTION_DESCRIBE([at_fn_check_prepare_dynamic], [COMMAND LINE],
[Decide if COMMAND at LINE is traceable at runtime, and call the
appropriate preparation function.])
at_fn_check_prepare_dynamic ()
{
  case $[1] in
    *$as_nl*)
      at_fn_check_prepare_notrace 'an embedded newline' "$[2]" ;;
    *)
      at_fn_check_prepare_trace "$[2]" ;;
  esac
}

AS_FUNCTION_DESCRIBE([at_fn_filter_trace], [],
[Remove the lines in the file "$at_stderr" generated by "set -x" and print
them to stderr.])
at_fn_filter_trace ()
{
  mv "$at_stderr" "$at_stder1"
  grep '^ *+' "$at_stder1" >&2
  grep -v '^ *+' "$at_stder1" >"$at_stderr"
}

AS_FUNCTION_DESCRIBE([at_fn_log_failure], [FILE-LIST],
[Copy the files in the list on stdout with a "> " prefix, and exit the shell
with a failure exit code.])
at_fn_log_failure ()
{
  for file
    do AS_ECHO(["$file:"]); sed 's/^/> /' "$file"; done
  echo 1 > "$at_status_file"
  exit 1
}

AS_FUNCTION_DESCRIBE([at_fn_check_skip], [EXIT-CODE LINE],
[Check whether EXIT-CODE is a special exit code (77 or 99), and if so exit
the test group subshell with that same exit code.  Use LINE in any report
about test failure.])
at_fn_check_skip ()
{
  case $[1] in
    99) echo 99 > "$at_status_file"; at_failed=:
        AS_ECHO(["$[2]: hard failure"]); exit 99;;
    77) echo 77 > "$at_status_file"; exit 77;;
  esac
}

AS_FUNCTION_DESCRIBE([at_fn_check_status], [EXPECTED EXIT-CODE LINE],
[Check whether EXIT-CODE is the EXPECTED exit code, and if so do nothing.
Otherwise, if it is 77 or 99, exit the test group subshell with that same
exit code; if it is anything else print an error message referring to LINE,
and fail the test.])
at_fn_check_status ()
{
dnl This order ensures that we don't `skip' if we are precisely checking
dnl $? = 77 or $? = 99.
  case $[2] in
    $[1] ) ;;
    77) echo 77 > "$at_status_file"; exit 77;;
    99) echo 99 > "$at_status_file"; at_failed=:
        AS_ECHO(["$[3]: hard failure"]); exit 99;;
    *) AS_ECHO(["$[3]: exit code was $[2], expected $[1]"])
      at_failed=:;;
  esac
}

AS_FUNCTION_DESCRIBE([at_fn_diff_devnull], [FILE],
[Emit a diff between /dev/null and FILE.  Uses "test -s" to avoid useless
diff invocations.])
at_fn_diff_devnull ()
{
  test -s "$[1]" || return 0
  $at_diff "$at_devnull" "$[1]"
}

AS_FUNCTION_DESCRIBE([at_fn_test], [NUMBER],
[Parse out test NUMBER from the tail of this file.])
at_fn_test ()
{
  eval at_sed=\$at_sed$[1]
  sed "$at_sed" "$at_myself" > "$at_test_source"
}

AS_FUNCTION_DESCRIBE([at_fn_create_debugging_script], [],
[Create the debugging script $at_group_dir/run which will reproduce the
current test group.])
at_fn_create_debugging_script ()
{
  {
    echo "#! /bin/sh" &&
    echo 'test "${ZSH_VERSION+set}" = set dnl
&& alias -g '\''${1+"$[@]"}'\''='\''"$[@]"'\''' &&
    AS_ECHO(["cd '$at_dir'"]) &&
    AS_ECHO(["exec \${CONFIG_SHELL-$SHELL} \"$at_myself\" -v -d ]dnl
[$at_debug_args $at_group \${1+\"\$[@]\"}"]) &&
    echo 'exit 1'
  } >"$at_group_dir/run" &&
  chmod +x "$at_group_dir/run"
}

m4_text_box([End of autotest shell functions.])
m4_divert_pop([PREPARE_TESTS])dnl back to DEFAULTS

# Not all shells have the 'times' builtin; the subshell is needed to make
# sure we discard the 'times: not found' message from the shell.
at_times_p=false
(times) >/dev/null 2>&1 && at_times_p=:

# CLI Arguments to pass to the debugging scripts.
at_debug_args=
# -e sets to true
at_errexit_p=false
# Shall we be verbose?  ':' means no, empty means yes.
at_verbose=:
at_quiet=
# Running several jobs in parallel, 0 means as many as test groups.
at_jobs=1
at_traceon=:
at_trace_echo=:
at_check_filter_trace=:

# Shall we keep the debug scripts?  Must be `:' when the suite is
# run by a debug script, so that the script doesn't remove itself.
at_debug_p=false
# Display help message?
at_help_p=false
# Display the version message?
at_version_p=false
# List test groups?
at_list_p=false
# --clean
at_clean=false
# Test groups to run
at_groups=
# Whether a write failure occurred
at_write_fail=0

# The directory we run the suite in.  Default to . if no -C option.
at_dir=`pwd`
# An absolute reference to this testsuite script.
dnl m4-double quote, to preserve []
[case $as_myself in
  [\\/]* | ?:[\\/]* ) at_myself=$as_myself ;;
  * ) at_myself=$at_dir/$as_myself ;;
esac]
# Whether -C is in effect.
at_change_dir=false
m4_divert_pop([DEFAULTS])dnl
m4_define([_AT_FINISH],
[m4_ifdef([AT_ingroup], [m4_fatal([missing AT_CLEANUP detected])])dnl
m4_divert_text([DEFAULTS],
[
# List of the tested programs.
at_tested='m4_ifdef([AT_tested],
  [m4_translit(m4_dquote(m4_defn([AT_tested])), [ ], m4_newline)])'
# List of the all the test groups.
at_groups_all='AT_groups_all'
# As many question marks as there are digits in the last test group number.
# Used to normalize the test group numbers so that `ls' lists them in
# numerical order.
at_format='m4_bpatsubst(m4_defn([AT_ordinal]), [.], [?])'
# Description of all the test groups.
at_help_all="AS_ESCAPE(m4_dquote(m4_defn([AT_help_all])))"

AS_FUNCTION_DESCRIBE([at_fn_validate_ranges], [NAME...],
[Validate and normalize the test group number contained in each
variable NAME.  Leading zeroes are treated as decimal.])
at_fn_validate_ranges ()
{
  for at_grp
  do
    eval at_value=\$$at_grp
    if test $at_value -lt 1 || test $at_value -gt AT_ordinal; then
      AS_ECHO(["invalid test group: $at_value"]) >&2
      exit 1
    fi
    case $at_value in
      0*) # We want to treat leading 0 as decimal, like expr and test, but
          # AS_VAR_ARITH treats it as octal if it uses $(( )).
          # With XSI shells, ${at_value#${at_value%%[1-9]*}} avoids the
          # expr fork, but it is not worth the effort to determine if the
          # shell supports XSI when the user can just avoid leading 0.
          eval $at_grp='`expr $at_value + 0`' ;;
    esac
  done
}])])dnl
m4_divert_push([PARSE_ARGS])dnl

at_prev=
for at_option
do
  # If the previous option needs an argument, assign it.
  if test -n "$at_prev"; then
    at_option=$at_prev=$at_option
    at_prev=
  fi

  case $at_option in
  *=*) at_optarg=`expr "x$at_option" : 'x[[^=]]*=\(.*\)'` ;;
  *)   at_optarg= ;;
  esac

  # Accept the important Cygnus configure options, so we can diagnose typos.

  case $at_option in
    --help | -h )
        at_help_p=:
        ;;

    --list | -l )
        at_list_p=:
        ;;

    --version | -V )
        at_version_p=:
        ;;

    --clean | -c )
        at_clean=:
        ;;

    --debug | -d )
        at_debug_p=:
        ;;

    --errexit | -e )
        at_debug_p=:
        at_errexit_p=:
        ;;

    --verbose | -v )
        at_verbose=; at_quiet=:
        ;;

    --trace | -x )
        at_traceon='set -x'
        at_trace_echo=echo
        at_check_filter_trace=at_fn_filter_trace
        ;;

    [[0-9] | [0-9][0-9] | [0-9][0-9][0-9] | [0-9][0-9][0-9][0-9]])
        at_fn_validate_ranges at_option
        AS_VAR_APPEND([at_groups], ["$at_option "])
        ;;

    # Ranges
    [[0-9]- | [0-9][0-9]- | [0-9][0-9][0-9]- | [0-9][0-9][0-9][0-9]-])
        at_range_start=`echo $at_option |tr -d X-`
        at_fn_validate_ranges at_range_start
        at_range=`AS_ECHO([" $at_groups_all "]) | \
          sed -e 's/^.* \('$at_range_start' \)/\1/'`
        AS_VAR_APPEND([at_groups], ["$at_range "])
        ;;

    [-[0-9] | -[0-9][0-9] | -[0-9][0-9][0-9] | -[0-9][0-9][0-9][0-9]])
        at_range_end=`echo $at_option |tr -d X-`
        at_fn_validate_ranges at_range_end
        at_range=`AS_ECHO([" $at_groups_all "]) | \
          sed -e 's/\( '$at_range_end'\) .*$/\1/'`
        AS_VAR_APPEND([at_groups], ["$at_range "])
        ;;

    [[0-9]-[0-9] | [0-9]-[0-9][0-9] | [0-9]-[0-9][0-9][0-9]] | \
    [[0-9]-[0-9][0-9][0-9][0-9] | [0-9][0-9]-[0-9][0-9]] | \
    [[0-9][0-9]-[0-9][0-9][0-9] | [0-9][0-9]-[0-9][0-9][0-9][0-9]] | \
    [[0-9][0-9][0-9]-[0-9][0-9][0-9]] | \
    [[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]] | \
    [[0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]] )
        at_range_start=`expr $at_option : '\(.*\)-'`
        at_range_end=`expr $at_option : '.*-\(.*\)'`
        if test $at_range_start -gt $at_range_end; then
          at_tmp=$at_range_end
          at_range_end=$at_range_start
          at_range_start=$at_tmp
        fi
        at_fn_validate_ranges at_range_start at_range_end
        at_range=`AS_ECHO([" $at_groups_all "]) | \
          sed -e 's/^.*\( '$at_range_start' \)/\1/' \
              -e 's/\( '$at_range_end'\) .*$/\1/'`
        AS_VAR_APPEND([at_groups], ["$at_range "])
        ;;

    # Directory selection.
    --directory | -C )
        at_prev=--directory
        ;;
    --directory=* )
        at_change_dir=:
        at_dir=$at_optarg
        ;;

    # Parallel execution.
    --jobs | -j )
        at_jobs=0
        ;;
    --jobs=* | -j[[0-9]]* )
        if test -n "$at_optarg"; then
          at_jobs=$at_optarg
        else
          at_jobs=`expr X$at_option : 'X-j\(.*\)'`
        fi
        case $at_jobs in *[[!0-9]]*)
          at_optname=`echo " $at_option" | sed 's/^ //; s/[[0-9=]].*//'`
          AS_ERROR([non-numeric argument to $at_optname: $at_jobs]) ;;
        esac
        ;;

    # Keywords.
    --keywords | -k )
        at_prev=--keywords
        ;;
    --keywords=* )
        at_groups_selected=$at_help_all
        at_save_IFS=$IFS
        IFS=,
        set X $at_optarg
        shift
        IFS=$at_save_IFS
        for at_keyword
        do
          at_invert=
          case $at_keyword in
          '!'*)
            at_invert="-v"
            at_keyword=`expr "X$at_keyword" : 'X!\(.*\)'`
            ;;
          esac
          # It is on purpose that we match the test group titles too.
          at_groups_selected=`AS_ECHO(["$at_groups_selected"]) |
              grep -i $at_invert ["^[1-9][^;]*;.*[; ]$at_keyword[ ;]"]`
        done
        # Smash the newlines.
        at_groups_selected=`AS_ECHO(["$at_groups_selected"]) | sed 's/;.*//' |
          tr "$as_nl" ' '
        `
        AS_VAR_APPEND([at_groups], ["$at_groups_selected "])
        ;;
m4_divert_pop([PARSE_ARGS])dnl
dnl Process *=* last to allow for user specified --option=* type arguments.
m4_divert_push([PARSE_ARGS_END])dnl

    *=*)
        at_envvar=`expr "x$at_option" : 'x\([[^=]]*\)='`
        # Reject names that are not valid shell variable names.
        case $at_envvar in
          '' | [[0-9]]* | *[[!_$as_cr_alnum]]* )
            AS_ERROR([invalid variable name: `$at_envvar']) ;;
        esac
        at_value=`AS_ECHO(["$at_optarg"]) | sed "s/'/'\\\\\\\\''/g"`
        # Export now, but save eval for later and for debug scripts.
        export $at_envvar
        AS_VAR_APPEND([at_debug_args], [" $at_envvar='$at_value'"])
        ;;

     *) AS_ECHO(["$as_me: invalid option: $at_option"]) >&2
        AS_ECHO(["Try \`$[0] --help' for more information."]) >&2
        exit 1
        ;;
  esac
done

# Verify our last option didn't require an argument
AS_IF([test -n "$at_prev"], [AS_ERROR([`$at_prev' requires an argument.])])

# Selected test groups.
if test -z "$at_groups"; then
  at_groups=$at_groups_all
else
  # Sort the tests, removing duplicates.
  at_groups=`AS_ECHO(["$at_groups"]) | tr ' ' "$as_nl" | sort -nu`
fi
m4_divert_pop([PARSE_ARGS_END])dnl
m4_divert_push([HELP])dnl

# Help message.
if $at_help_p; then
  cat <<_ATEOF || at_write_fail=1
Usage: $[0] [[OPTION]... [VARIABLE=VALUE]... [TESTS]]

Run all the tests, or the selected TESTS, given by numeric ranges, and
save a detailed log file.  Upon failure, create debugging scripts.

Do not change environment variables directly.  Instead, set them via
command line arguments.  Set \`AUTOTEST_PATH' to select the executables
to exercise.  Each relative directory is expanded as build and source
directories relative to the top level of this distribution.
E.g., from within the build directory /tmp/foo-1.0, invoking this:

  $ $[0] AUTOTEST_PATH=bin

is equivalent to the following, assuming the source directory is /src/foo-1.0:

  PATH=/tmp/foo-1.0/bin:/src/foo-1.0/bin:\$PATH $[0]
_ATEOF
m4_divert_pop([HELP])dnl
m4_divert_push([HELP_MODES])dnl
cat <<_ATEOF || at_write_fail=1

Operation modes:
  -h, --help     print the help message, then exit
  -V, --version  print version number, then exit
  -c, --clean    remove all the files this test suite might create and exit
  -l, --list     describes all the tests, or the selected TESTS
_ATEOF
m4_divert_pop([HELP_MODES])dnl
m4_divert_push([HELP_TUNING])dnl
cat <<_ATEOF || at_write_fail=1

dnl extra quoting prevents emacs whitespace mode from putting tabs in output
Execution tuning:
  -C, --directory=DIR
[                 change to directory DIR before starting]
  -j, --jobs[[=N]]
[                 Allow N jobs at once; infinite jobs with no arg (default 1)]
  -k, --keywords=KEYWORDS
[                 select the tests matching all the comma-separated KEYWORDS]
[                 multiple \`-k' accumulate; prefixed \`!' negates a KEYWORD]
  -e, --errexit  abort as soon as a test fails; implies --debug
  -v, --verbose  force more detailed output
[                 default for debugging scripts]
  -d, --debug    inhibit clean up and top-level logging
[                 default for debugging scripts]
  -x, --trace    enable tests shell tracing
_ATEOF
m4_divert_pop([HELP_TUNING])dnl
m4_divert_push([HELP_END])dnl
cat <<_ATEOF || at_write_fail=1

Report bugs to <AT_PACKAGE_BUGREPORT>.dnl
m4_ifdef([AT_PACKAGE_NAME],
[m4_ifset([AT_PACKAGE_URL], [
m4_defn([AT_PACKAGE_NAME]) home page: <AT_PACKAGE_URL>.])dnl
m4_if(m4_index(m4_defn([AT_PACKAGE_NAME]), [GNU ]), [0], [
General help using GNU software: <http://www.gnu.org/gethelp/>.])])
_ATEOF
  exit $at_write_fail
fi

# List of tests.
if $at_list_p; then
  cat <<_ATEOF || at_write_fail=1
AT_TESTSUITE_NAME test groups:

 NUM: FILE-NAME:LINE     TEST-GROUP-NAME
      KEYWORDS

_ATEOF
  # Passing at_groups is tricky.  We cannot use it to form a literal string
  # or regexp because of the limitation of AIX awk.  And Solaris' awk
  # doesn't grok more than 99 fields in a record, so we have to use `split'.
  # at_groups needs to be space-separated for this script to work.
  case $at_groups in
    *"$as_nl"* )
      at_groups=`AS_ECHO(["$at_groups"]) | tr "$as_nl" ' '` ;;
  esac
  AS_ECHO(["$at_groups$as_nl$at_help_all"]) |
    awk 'BEGIN { FS = ";" }
         NR == 1 {
           for (n = split ($ 0, a, " "); n; n--)
             selected[[a[n]]] = 1
           next
         }
         NF > 0 {
           if (selected[[$ 1]]) {
             printf " %3d: %-18s %s\n", $ 1, $ 2, $ 3
             if ($ 4) {
               lmax = 79
               indent = "     "
               line = indent
               len = length (line)
               n = split ($ 4, a, " ")
               for (i = 1; i <= n; i++) {
                 l = length (a[[i]]) + 1
                 if (i > 1 && len + l > lmax) {
                   print line
                   line = indent " " a[[i]]
                   len = length (line)
                 } else {
                   line = line " " a[[i]]
                   len += l
                 }
               }
               if (n)
                 print line
             }
           }
         }' || at_write_fail=1
  exit $at_write_fail
fi
m4_divert_pop([HELP_END])dnl
m4_divert_push([VERSION])dnl
if $at_version_p; then
  AS_ECHO(["$as_me (AT_PACKAGE_STRING)"]) &&
  cat <<\_ATEOF || at_write_fail=1
m4_divert_pop([VERSION])dnl
m4_divert_push([VERSION_END])dnl
_ATEOF
  exit $at_write_fail
fi
m4_divert_pop([VERSION_END])dnl
m4_divert_push([TESTS_BEGIN])dnl

# Take any -C into account.
if $at_change_dir ; then
  if test x- = "x$at_dir" ; then
    at_dir=./-
  fi
  test x != "x$at_dir" && cd "$at_dir" \
    || AS_ERROR([unable to change directory])
  at_dir=`pwd`
fi

# Load the config files for any default variable assignments.
for at_file in atconfig atlocal
do
  test -r $at_file || continue
  . ./$at_file || AS_ERROR([invalid content: $at_file])
done

# Autoconf <=2.59b set at_top_builddir instead of at_top_build_prefix:
: ${at_top_build_prefix=$at_top_builddir}

# Perform any assignments requested during argument parsing.
eval "$at_debug_args"

# atconfig delivers names relative to the directory the test suite is
# in, but the groups themselves are run in testsuite-dir/group-dir.
if test -n "$at_top_srcdir"; then
  builddir=../..
  for at_dir_var in srcdir top_srcdir top_build_prefix
  do
    AS_VAR_COPY([at_val], [at_$at_dir_var])
    case $at_val in
      [[\\/$]]* | ?:[[\\/]]* ) at_prefix= ;;
      *) at_prefix=../../ ;;
    esac
    AS_VAR_SET([$at_dir_var], [$at_prefix$at_val])
  done
fi

m4_text_box([Directory structure.])

# This is the set of directories and files used by this script
# (non-literals are capitalized):
#
# TESTSUITE         - the testsuite
# TESTSUITE.log     - summarizes the complete testsuite run
# TESTSUITE.dir/    - created during a run, remains after -d or failed test
# + at-groups/      - during a run: status of all groups in run
# | + NNN/          - during a run: meta-data about test group NNN
# | | + check-line  - location (source file and line) of current AT_CHECK
# | | + status      - exit status of current AT_CHECK
# | | + stdout      - stdout of current AT_CHECK
# | | + stder1      - stderr, including trace
# | | + stderr      - stderr, with trace filtered out
# | | + test-source - portion of testsuite that defines group
# | | + times       - timestamps for computing duration
# | | + pass        - created if group passed
# | | + xpass       - created if group xpassed
# | | + fail        - created if group failed
# | | + xfail       - created if group xfailed
# | | + skip        - created if group skipped
# + at-stop         - during a run: end the run if this file exists
# + at-source-lines - during a run: cache of TESTSUITE line numbers for extraction
# + 0..NNN/         - created for each group NNN, remains after -d or failed test
# | + TESTSUITE.log - summarizes the group results
# | + ...           - files created during the group

# The directory the whole suite works in.
# Should be absolute to let the user `cd' at will.
at_suite_dir=$at_dir/$as_me.dir
# The file containing the suite.
at_suite_log=$at_dir/$as_me.log
# The directory containing helper files per test group.
at_helper_dir=$at_suite_dir/at-groups
# Stop file: if it exists, do not start new jobs.
at_stop_file=$at_suite_dir/at-stop
# The fifo used for the job dispatcher.
at_job_fifo=$at_suite_dir/at-job-fifo

if $at_clean; then
  test -d "$at_suite_dir" &&
    find "$at_suite_dir" -type d ! -perm -700 -exec chmod u+rwx \{\} \;
  rm -f -r "$at_suite_dir" "$at_suite_log"
  exit $?
fi

# Don't take risks: use only absolute directories in PATH.
#
# For stand-alone test suites (ie. atconfig was not found),
# AUTOTEST_PATH is relative to `.'.
#
# For embedded test suites, AUTOTEST_PATH is relative to the top level
# of the package.  Then expand it into build/src parts, since users
# may create executables in both places.
AUTOTEST_PATH=`AS_ECHO(["$AUTOTEST_PATH"]) | sed "s|:|$PATH_SEPARATOR|g"`
at_path=
_AS_PATH_WALK([$AUTOTEST_PATH $PATH],
[test -n "$at_path" && AS_VAR_APPEND([at_path], [$PATH_SEPARATOR])
case $as_dir in
  [[\\/]]* | ?:[[\\/]]* )
    AS_VAR_APPEND([at_path], ["$as_dir"])
    ;;
  * )
    if test -z "$at_top_build_prefix"; then
      # Stand-alone test suite.
      AS_VAR_APPEND([at_path], ["$as_dir"])
    else
      # Embedded test suite.
      AS_VAR_APPEND([at_path], ["$at_top_build_prefix$as_dir$PATH_SEPARATOR"])
      AS_VAR_APPEND([at_path], ["$at_top_srcdir/$as_dir"])
    fi
    ;;
esac])

# Now build and simplify PATH.
#
# There might be directories that don't exist, but don't redirect
# builtins' (eg., cd) stderr directly: Ultrix's sh hates that.
at_new_path=
_AS_PATH_WALK([$at_path],
[test -d "$as_dir" || continue
case $as_dir in
  [[\\/]]* | ?:[[\\/]]* ) ;;
  * ) as_dir=`(cd "$as_dir" && pwd) 2>/dev/null` ;;
esac
case $PATH_SEPARATOR$at_new_path$PATH_SEPARATOR in
  *$PATH_SEPARATOR$as_dir$PATH_SEPARATOR*) ;;
  $PATH_SEPARATOR$PATH_SEPARATOR) at_new_path=$as_dir ;;
  *) AS_VAR_APPEND([at_new_path], ["$PATH_SEPARATOR$as_dir"]) ;;
esac])
PATH=$at_new_path
export PATH

# Setting up the FDs.
m4_define([AS_MESSAGE_LOG_FD], [5])
m4_define([AT_JOB_FIFO_FD], [6])
[#] AS_MESSAGE_LOG_FD is the log file.  Not to be overwritten if `-d'.
if $at_debug_p; then
  at_suite_log=/dev/null
else
  : >"$at_suite_log"
fi
exec AS_MESSAGE_LOG_FD>>"$at_suite_log"

# Banners and logs.
AS_BOX(m4_defn([AT_TESTSUITE_NAME])[.])
{
  AS_BOX(m4_defn([AT_TESTSUITE_NAME])[.])
  echo

  AS_ECHO(["$as_me: command line was:"])
  AS_ECHO(["  \$ $[0] $at_cli_args"])
  echo

  # Try to find a few ChangeLogs in case it might help determining the
  # exact version.  Use the relative dir: if the top dir is a symlink,
  # find will not follow it (and options to follow the links are not
  # portable), which would result in no output here.  Prune directories
  # matching the package tarname, since they tend to be leftovers from
  # `make dist' or `make distcheck' and contain redundant or stale logs.
  if test -n "$at_top_srcdir"; then
    AS_BOX([ChangeLogs.])
    echo
    for at_file in `find "$at_top_srcdir" m4_ifdef([AT_PACKAGE_TARNAME],
[-name "AT_PACKAGE_TARNAME-*" -prune -o ])-name ChangeLog -print`
    do
      AS_ECHO(["$as_me: $at_file:"])
      sed 's/^/| /;10q' $at_file
      echo
    done

  fi

  AS_UNAME
  echo

  # Contents of the config files.
  for at_file in atconfig atlocal
  do
    test -r $at_file || continue
    AS_ECHO(["$as_me: $at_file:"])
    sed 's/^/| /' $at_file
    echo
  done
} >&AS_MESSAGE_LOG_FD

m4_divert_pop([TESTS_BEGIN])dnl
m4_divert_push([PREPARE_TESTS])dnl
{
  AS_BOX([Tested programs.])
  echo
} >&AS_MESSAGE_LOG_FD

# Report what programs are being tested.
for at_program in : $at_tested
do
  test "$at_program" = : && continue
  _AS_PATH_WALK([$PATH], [test -f "$as_dir/$at_program" && break])
  if test -f "$as_dir/$at_program"; then
    {
      AS_ECHO(["$at_srcdir/AT_LINE: $as_dir/$at_program --version"])
      "$as_dir/$at_program" --version </dev/null
      echo
    } >&AS_MESSAGE_LOG_FD 2>&1
  else
    AS_ERROR([cannot find $at_program])
  fi
done

{
  AS_BOX([Running the tests.])
} >&AS_MESSAGE_LOG_FD

at_start_date=`date`
at_start_time=`date +%s 2>/dev/null`
AS_ECHO(["$as_me: starting at: $at_start_date"]) >&AS_MESSAGE_LOG_FD
m4_divert_pop([PREPARE_TESTS])dnl
m4_divert_push([TESTS])dnl

# Create the master directory if it doesn't already exist.
AS_MKDIR_P(["$at_suite_dir"]) ||
  AS_ERROR([cannot create `$at_suite_dir'])

# Can we diff with `/dev/null'?  DU 5.0 refuses.
if diff /dev/null /dev/null >/dev/null 2>&1; then
  at_devnull=/dev/null
else
  at_devnull=$at_suite_dir/devnull
  >"$at_devnull"
fi

# Use `diff -u' when possible.
if at_diff=`diff -u "$at_devnull" "$at_devnull" 2>&1` && test -z "$at_diff"
then
  at_diff='diff -u'
else
  at_diff=diff
fi

# Get the last needed group.
for at_group in : $at_groups; do :; done

# Extract the start and end lines of each test group at the tail
# of this file
awk '
BEGIN { FS="\a" }
/^@%:@AT_START_/ {
  start = NR
}
/^@%:@AT_STOP_/ {
  test = substr ($ 0, 10)
  print "at_sed" test "=\"1," start "d;" (NR-1) "q\""
  if (test == "'"$at_group"'") exit
}' "$at_myself" > "$at_suite_dir/at-source-lines" &&
. "$at_suite_dir/at-source-lines" ||
  AS_ERROR([cannot create test line number cache])
rm -f "$at_suite_dir/at-source-lines"

# Set number of jobs for `-j'; avoid more jobs than test groups.
set X $at_groups; shift; at_max_jobs=$[@%:@]
if test $at_max_jobs -eq 0; then
  at_jobs=1
fi
if test $at_jobs -ne 1 &&
   { test $at_jobs -eq 0 || test $at_jobs -gt $at_max_jobs; }; then
  at_jobs=$at_max_jobs
fi

# If parallel mode, don't output banners, don't split summary lines.
if test $at_jobs -ne 1; then
  at_print_banners=false
  at_quiet=:
fi

# Set up helper dirs.
rm -rf "$at_helper_dir" &&
mkdir "$at_helper_dir" &&
cd "$at_helper_dir" &&
{ test -z "$at_groups" || mkdir $at_groups; } ||
AS_ERROR([testsuite directory setup failed])

# Functions for running a test group.  We leave the actual
# test group execution outside of a shell function in order
# to avoid hitting zsh 4.x exit status bugs.

AS_FUNCTION_DESCRIBE([at_fn_group_prepare], [],
[Prepare running a test group.])
at_fn_group_prepare ()
{
  # The directory for additional per-group helper files.
  at_job_dir=$at_helper_dir/$at_group
  # The file containing the location of the last AT_CHECK.
  at_check_line_file=$at_job_dir/check-line
  # The file containing the exit status of the last command.
  at_status_file=$at_job_dir/status
  # The files containing the output of the tested commands.
  at_stdout=$at_job_dir/stdout
  at_stder1=$at_job_dir/stder1
  at_stderr=$at_job_dir/stderr
  # The file containing the code for a test group.
  at_test_source=$at_job_dir/test-source
  # The file containing dates.
  at_times_file=$at_job_dir/times

  # Be sure to come back to the top test directory.
  cd "$at_suite_dir"

  # Clearly separate the test groups when verbose.
  $at_first || $at_verbose echo

  at_group_normalized=$at_group
  _AT_NORMALIZE_TEST_GROUP_NUMBER(at_group_normalized)

  # Create a fresh directory for the next test group, and enter.
  # If one already exists, the user may have invoked ./run from
  # within that directory; we remove the contents, but not the
  # directory itself, so that we aren't pulling the rug out from
  # under the shell's notion of the current directory.
  at_group_dir=$at_suite_dir/$at_group_normalized
  at_group_log=$at_group_dir/$as_me.log
  _AS_CLEAN_DIR("$at_group_dir") ||
    AS_WARN([test directory for $at_group_normalized could not be cleaned.])
  # Be tolerant if the above `rm' was not able to remove the directory.
  AS_MKDIR_P(["$at_group_dir"])

  echo 0 > "$at_status_file"

  # In verbose mode, append to the log file *and* show on
  # the standard output; in quiet mode only write to the log.
  if test -z "$at_verbose"; then
    at_tee_pipe='tee -a "$at_group_log"'
  else
    at_tee_pipe='cat >> "$at_group_log"'
  fi
}

AS_FUNCTION_DESCRIBE([at_fn_group_postprocess], [],
[Perform cleanup after running a test group.])
at_fn_group_postprocess ()
{
  # Be sure to come back to the suite directory, in particular
  # since below we might `rm' the group directory we are in currently.
  cd "$at_suite_dir"

  if test ! -f "$at_check_line_file"; then
    sed "s/^ */$as_me: WARNING: /" <<_ATEOF
      A failure happened in a test group before any test could be
      run. This means that test suite is improperly designed.  Please
      report this failure to <AT_PACKAGE_BUGREPORT>.
_ATEOF
    AS_ECHO(["$at_setup_line"]) >"$at_check_line_file"
    at_status=99
  fi
  $at_verbose AS_ECHO_N(["$at_group. $at_setup_line: "])
  AS_ECHO_N(["$at_group. $at_setup_line: "]) >> "$at_group_log"
  case $at_xfail:$at_status in
    *:99)
        at_msg='FAILED ('`cat "$at_check_line_file"`')'
        at_res=fail
        at_errexit=$at_errexit_p
        ;;
    yes:0)
        at_msg="UNEXPECTED PASS"
        at_res=xpass
        at_errexit=$at_errexit_p
        ;;
    no:0)
        at_msg="ok"
        at_res=pass
        at_errexit=false
        ;;
    *:77)
        at_msg='skipped ('`cat "$at_check_line_file"`')'
        at_res=skip
        at_errexit=false
        ;;
    yes:*)
        at_msg='expected failure ('`cat "$at_check_line_file"`')'
        at_res=xfail
        at_errexit=false
        ;;
    no:*)
        at_msg='FAILED ('`cat "$at_check_line_file"`')'
        at_res=fail
        at_errexit=$at_errexit_p
        ;;
  esac
  echo "$at_res" > "$at_job_dir/$at_res"
  # In parallel mode, output the summary line only afterwards.
  if test $at_jobs -ne 1 && test -n "$at_verbose"; then
    AS_ECHO(["$at_desc_line $at_msg"])
  else
    # Make sure there is a separator even with long titles.
    AS_ECHO([" $at_msg"])
  fi
  at_log_msg="$at_group. $at_desc ($at_setup_line): $at_msg"
  case $at_status in
    0|77)
      # $at_times_file is only available if the group succeeded.
      # We're not including the group log, so the success message
      # is written in the global log separately.  But we also
      # write to the group log in case they're using -d.
      if test -f "$at_times_file"; then
        at_log_msg="$at_log_msg     ("`sed 1d "$at_times_file"`')'
        rm -f "$at_times_file"
      fi
      AS_ECHO(["$at_log_msg"]) >> "$at_group_log"
      AS_ECHO(["$at_log_msg"]) >&AS_MESSAGE_LOG_FD

      # Cleanup the group directory, unless the user wants the files.
      if $at_debug_p; then
        at_fn_create_debugging_script
      else
        if test -d "$at_group_dir"; then
          find "$at_group_dir" -type d ! -perm -700 -exec chmod u+rwx \{\} \;
          rm -fr "$at_group_dir"
        fi
        rm -f "$at_test_source"
      fi
      ;;
    *)
      # Upon failure, include the log into the testsuite's global
      # log.  The failure message is written in the group log.  It
      # is later included in the global log.
      AS_ECHO(["$at_log_msg"]) >> "$at_group_log"

      # Upon failure, keep the group directory for autopsy, and create
      # the debugging script.  With -e, do not start any further tests.
      at_fn_create_debugging_script
      if $at_errexit; then
        echo stop > "$at_stop_file"
      fi
      ;;
  esac
}


m4_text_box([Driver loop.])

dnl Catching signals correctly:
dnl
dnl The first idea was: trap the signal, send it to all spawned jobs,
dnl then reset the handler and reraise the signal for ourselves.
dnl However, before exiting, ksh will then send the signal to all
dnl process group members, potentially killing the outer testsuite
dnl and/or the 'make' process driving us.
dnl So now the strategy is: trap the signal, send it to all spawned jobs,
dnl then exit the script with the right status.
dnl
dnl In order to let the jobs know about the signal, we cannot just send it
dnl to the current process group (kill $SIG 0), for the same reason as above.
dnl Also, it does not reliably stop the suite to send the signal to the
dnl spawned processes, because they might not transport it further
dnl (maybe this can be fixed?).
dnl
dnl So what we do is enable shell job control if available, which causes the
dnl shell to start each parallel task as its own shell job, thus as a new
dnl process group leader.  We then send the signal to all new process groups.

dnl Do we have job control?
if (set -m && set +m) >/dev/null 2>&1; then
  at_job_control_on='set -m' at_job_control_off='set +m' at_job_group=-
else
  at_job_control_on=: at_job_control_off=: at_job_group=
fi

for at_signal in 1 2 15; do
dnl This signal handler is not suitable for PIPE: it causes writes.
dnl The code that was interrupted may have the errexit, monitor, or xtrace
dnl flags enabled, so sanitize.
  trap 'set +x; set +e
        $at_job_control_off
        at_signal='"$at_signal"'
dnl Safety belt: even with runaway processes, prevent starting new jobs.
        echo stop > "$at_stop_file"
dnl Do not enter this area multiple times, do not kill self prematurely.
        trap "" $at_signal
dnl Gather process group IDs of currently running jobs.
        at_pgids=
        for at_pgid in `jobs -p 2>/dev/null`; do
          at_pgids="$at_pgids $at_job_group$at_pgid"
        done
dnl Ignore `kill' errors, as some jobs may have finished in the meantime.
        test -z "$at_pgids" || kill -$at_signal $at_pgids 2>/dev/null
dnl wait until all jobs have exited.
        wait
dnl Status output.  Do this after waiting for the jobs, for ordered output.
dnl Avoid scribbling onto the end of a possibly incomplete line.
        if test "$at_jobs" -eq 1 || test -z "$at_verbose"; then
          echo >&2
        fi
        at_signame=`kill -l $at_signal 2>&1 || echo $at_signal`
        set x $at_signame
        test $# -gt 2 && at_signame=$at_signal
        AS_WARN([caught signal $at_signame, bailing out])
dnl Do not reinstall the default handler here and reraise the signal to
dnl let the default handler do its job, see the note about ksh above.
dnl     trap - $at_signal
dnl     kill -$at_signal $$
dnl Instead, exit with appropriate status.
        AS_VAR_ARITH([exit_status], [128 + $at_signal])
        AS_EXIT([$exit_status])' $at_signal
done

rm -f "$at_stop_file"
at_first=:

if test $at_jobs -ne 1 &&
     rm -f "$at_job_fifo" &&
     test -n "$at_job_group" &&
     ( mkfifo "$at_job_fifo" && trap 'exit 1' PIPE STOP TSTP ) 2>/dev/null
then
  # FIFO job dispatcher.

dnl Since we use job control, we need to propagate TSTP.
dnl This handler need not be used for serial execution.
dnl Again, we should stop all processes in the job groups, otherwise
dnl the stopping will not be effective while one test group is running.
dnl Apparently ksh does not honor the TSTP trap.
dnl As a safety measure, not use the same variable names as in the
dnl termination handlers above, one might get called during execution
dnl of the other.
  trap 'at_pids=
        for at_pid in `jobs -p`; do
          at_pids="$at_pids $at_job_group$at_pid"
        done
dnl Send it to all spawned jobs, ignoring those finished meanwhile.
        if test -n "$at_pids"; then
dnl Unfortunately, ksh93 fork-bombs when we send TSTP, so send STOP
dnl if this might be ksh (STOP prevents possible TSTP handlers inside
dnl AT_CHECKs from running).  Then stop ourselves.
          at_sig=TSTP
          test "${TMOUT+set}" = set && at_sig=STOP
          kill -$at_sig $at_pids 2>/dev/null
        fi
        kill -STOP $$
dnl We got a CONT, so let's go again.  Passing this to all processes
dnl in the groups is necessary (because we stopped them), but it may
dnl cause changed test semantics; e.g., a sleep will be interrupted.
        test -z "$at_pids" || kill -CONT $at_pids 2>/dev/null' TSTP

  echo
  # Turn jobs into a list of numbers, starting from 1.
  at_joblist=`AS_ECHO([" $at_groups_all "]) | \
    sed 's/\( '$at_jobs'\) .*/\1/'`

  set X $at_joblist
  shift
  for at_group in $at_groups; do
dnl Enable job control only for spawning the test group:
dnl Let the jobs to run in separate process groups, but
dnl avoid all the status output by the shell.
    $at_job_control_on 2>/dev/null
    (
      # Start one test group.
      $at_job_control_off
      exec AT_JOB_FIFO_FD>"$at_job_fifo"
dnl When a child receives PIPE, be sure to write back the token,
dnl so the master does not hang waiting for it.
dnl errexit and xtrace should not be set in this shell instance,
dnl except as debug measures.  However, shells such as dash may
dnl optimize away the _AT_CHECK subshell, so normalize here.
      trap 'set +x; set +e
dnl Ignore PIPE signals that stem from writing back the token.
            trap "" PIPE
            echo stop > "$at_stop_file"
            echo token >&AT_JOB_FIFO_FD
dnl Do not reraise the default PIPE handler.
dnl It wreaks havoc with ksh, see above.
dnl         trap - 13
dnl         kill -13 $$
            AS_EXIT([141])' PIPE
      at_fn_group_prepare
      if cd "$at_group_dir" &&
         at_fn_test $at_group &&
         . "$at_test_source" # AT_JOB_FIFO_FD>&-
      then :; else
        AS_WARN([unable to parse test group: $at_group])
        at_failed=:
      fi
      at_fn_group_postprocess
      echo token >&AT_JOB_FIFO_FD
    ) &
    $at_job_control_off
    if $at_first; then
      at_first=false
      exec AT_JOB_FIFO_FD<"$at_job_fifo"
    fi
    shift # Consume one token.
    if test $[@%:@] -gt 0; then :; else
      read at_token <&AT_JOB_FIFO_FD || break
      set x $[*]
    fi
    test -f "$at_stop_file" && break
  done
  # Read back the remaining ($at_jobs - 1) tokens.
  set X $at_joblist
  shift
  if test $[@%:@] -gt 0; then
    shift
    for at_job
    do
      read at_token
    done <&AT_JOB_FIFO_FD
  fi
  exec AT_JOB_FIFO_FD<&-
  wait
else
  # Run serially, avoid forks and other potential surprises.
  for at_group in $at_groups; do
    at_fn_group_prepare
    if cd "$at_group_dir" &&
       at_fn_test $at_group &&
       . "$at_test_source"; then :; else
      AS_WARN([unable to parse test group: $at_group])
      at_failed=:
    fi
    at_fn_group_postprocess
    test -f "$at_stop_file" && break
    at_first=false
  done
fi

# Wrap up the test suite with summary statistics.
cd "$at_helper_dir"

# Use ?..???? when the list must remain sorted, the faster * otherwise.
at_pass_list=`for f in */pass; do echo $f; done | sed '/\*/d; s,/pass,,'`
at_skip_list=`for f in */skip; do echo $f; done | sed '/\*/d; s,/skip,,'`
at_xfail_list=`for f in */xfail; do echo $f; done | sed '/\*/d; s,/xfail,,'`
at_xpass_list=`for f in ?/xpass ??/xpass ???/xpass ????/xpass; do
                 echo $f; done | sed '/?/d; s,/xpass,,'`
at_fail_list=`for f in ?/fail ??/fail ???/fail ????/fail; do
                echo $f; done | sed '/?/d; s,/fail,,'`

set X $at_pass_list $at_xpass_list $at_xfail_list $at_fail_list $at_skip_list
shift; at_group_count=$[@%:@]
set X $at_xpass_list; shift; at_xpass_count=$[@%:@]; at_xpass_list=$[*]
set X $at_xfail_list; shift; at_xfail_count=$[@%:@]
set X $at_fail_list; shift; at_fail_count=$[@%:@]; at_fail_list=$[*]
set X $at_skip_list; shift; at_skip_count=$[@%:@]

AS_VAR_ARITH([at_run_count], [$at_group_count - $at_skip_count])
AS_VAR_ARITH([at_unexpected_count], [$at_xpass_count + $at_fail_count])
AS_VAR_ARITH([at_total_fail_count], [$at_xfail_count + $at_fail_count])

# Back to the top directory.
cd "$at_dir"
rm -rf "$at_helper_dir"

# Compute the duration of the suite.
at_stop_date=`date`
at_stop_time=`date +%s 2>/dev/null`
AS_ECHO(["$as_me: ending at: $at_stop_date"]) >&AS_MESSAGE_LOG_FD
case $at_start_time,$at_stop_time in
  [[0-9]*,[0-9]*])
    AS_VAR_ARITH([at_duration_s], [$at_stop_time - $at_start_time])
    AS_VAR_ARITH([at_duration_m], [$at_duration_s / 60])
    AS_VAR_ARITH([at_duration_h], [$at_duration_m / 60])
    AS_VAR_ARITH([at_duration_s], [$at_duration_s % 60])
    AS_VAR_ARITH([at_duration_m], [$at_duration_m % 60])
    at_duration="${at_duration_h}h ${at_duration_m}m ${at_duration_s}s"
    AS_ECHO(["$as_me: test suite duration: $at_duration"]) >&AS_MESSAGE_LOG_FD
    ;;
esac

echo
AS_BOX([Test results.])
echo
{
  echo
  AS_BOX([Test results.])
  echo
} >&AS_MESSAGE_LOG_FD

dnl
dnl FIXME: this code is as far from i18n-cleanness as man
dnl could imagine...
dnl
if test $at_run_count = 1; then
  at_result="1 test"
  at_were=was
else
  at_result="$at_run_count tests"
  at_were=were
fi
if $at_errexit_p && test $at_unexpected_count != 0; then
  if test $at_xpass_count = 1; then
    at_result="$at_result $at_were run, one passed"
  else
    at_result="$at_result $at_were run, one failed"
  fi
  at_result="$at_result unexpectedly and inhibited subsequent tests."
else
  # Don't you just love exponential explosion of the number of cases?
  case $at_xpass_count:$at_fail_count:$at_xfail_count in
    # So far, so good.
    0:0:0) at_result="$at_result $at_were successful." ;;
    0:0:*) at_result="$at_result behaved as expected." ;;

    # Some unexpected failures
    0:*:0) at_result="$at_result $at_were run,
$at_fail_count failed unexpectedly." ;;

    # Some failures, both expected and unexpected
    0:*:1) at_result="$at_result $at_were run,
$at_total_fail_count failed ($at_xfail_count expected failure)." ;;
    0:*:*) at_result="$at_result $at_were run,
$at_total_fail_count failed ($at_xfail_count expected failures)." ;;

    # No unexpected failures, but some xpasses
    *:0:*) at_result="$at_result $at_were run,
$at_xpass_count passed unexpectedly." ;;

    # No expected failures, but failures and xpasses
    *:1:0) at_result="$at_result $at_were run,
$at_unexpected_count did not behave as expected dnl
($at_fail_count unexpected failure)." ;;
    *:*:0) at_result="$at_result $at_were run,
$at_unexpected_count did not behave as expected dnl
($at_fail_count unexpected failures)." ;;

    # All of them.
    *:*:1) at_result="$at_result $at_were run,
$at_xpass_count passed unexpectedly,
$at_total_fail_count failed ($at_xfail_count expected failure)." ;;
    *:*:*) at_result="$at_result $at_were run,
$at_xpass_count passed unexpectedly,
$at_total_fail_count failed ($at_xfail_count expected failures)." ;;
  esac

  if test $at_skip_count = 0 && test $at_run_count -gt 1; then
    at_result="All $at_result"
  fi
fi

# Now put skips in the mix.
case $at_skip_count in
  0) ;;
  1) at_result="$at_result
1 test was skipped." ;;
  *) at_result="$at_result
$at_skip_count tests were skipped." ;;
esac

if test $at_unexpected_count = 0; then
  echo "$at_result"
  echo "$at_result" >&AS_MESSAGE_LOG_FD
else
  echo "ERROR: $at_result" >&2
  echo "ERROR: $at_result" >&AS_MESSAGE_LOG_FD
  {
    echo
    AS_BOX([Summary of the failures.])

    # Summary of failed and skipped tests.
    if test $at_fail_count != 0; then
      echo "Failed tests:"
      $SHELL "$at_myself" $at_fail_list --list
      echo
    fi
    if test $at_skip_count != 0; then
      echo "Skipped tests:"
      $SHELL "$at_myself" $at_skip_list --list
      echo
    fi
    if test $at_xpass_count != 0; then
      echo "Unexpected passes:"
      $SHELL "$at_myself" $at_xpass_list --list
      echo
    fi
    if test $at_fail_count != 0; then
      AS_BOX([Detailed failed tests.])
      echo
      for at_group in $at_fail_list
      do
        at_group_normalized=$at_group
        _AT_NORMALIZE_TEST_GROUP_NUMBER(at_group_normalized)
        cat "$at_suite_dir/$at_group_normalized/$as_me.log"
        echo
      done
      echo
    fi
    if test -n "$at_top_srcdir"; then
      AS_BOX([${at_top_build_prefix}config.log])
      sed 's/^/| /' ${at_top_build_prefix}config.log
      echo
    fi
  } >&AS_MESSAGE_LOG_FD

  AS_BOX([$as_me.log was created.])

  echo
  AS_ECHO(["Please send \`${at_testdir+${at_testdir}/}$as_me.log' ]dnl
[and all information you think might help:

   To: <AT_PACKAGE_BUGREPORT>
   Subject: @<:@AT_PACKAGE_STRING@:>@ $as_me: dnl
$at_fail_list${at_fail_list:+ failed${at_xpass_list:+, }}dnl
$at_xpass_list${at_xpass_list:+ passed unexpectedly}
"])
  if test $at_debug_p = false; then
    echo
    echo 'You may investigate any problem if you feel able to do so, in which'
    echo 'case the test suite provides a good starting point.  Its output may'
    AS_ECHO(["be found below \`${at_testdir+${at_testdir}/}$as_me.dir'."])
    echo
  fi
    exit 1
fi

exit 0

m4_text_box([Actual tests.])
m4_divert_pop([TESTS])dnl
dnl End of AT_INIT: divert to KILL, only test groups are to be
dnl output, the rest is ignored.  Current diversion is BODY, inherited
dnl from M4sh.
m4_divert([KILL])
])# AT_INIT


# _AT_ARG_OPTION(OPTIONS,HELP-TEXT,[ARGS],[ACTION-IF-GIVEN],
#                [ACTION-IF-NOT-GIVEN])
# ---------------------------------------------------------------------------
# Internal implementation of AT_ARG_OPTION & AT_ARG_OPTION_ARG
m4_defun([_AT_ARG_OPTION],
[m4_divert_once([HELP_OTHER],
[cat <<_ATEOF || at_write_fail=1

Other options:
_ATEOF
])dnl m4_divert_once HELP_OTHER
m4_divert_text([HELP_OTHER],
[cat <<_ATEOF || at_write_fail=1
$2
_ATEOF])dnl
dnl Turn our options into our desired strings
m4_ifdef([AT_first_option],[m4_undefine([AT_first_option])])dnl
m4_ifdef([AT_case],[m4_undefine([AT_case])])dnl
m4_ifdef([AT_case_no],[m4_undefine([AT_case_no])])dnl
m4_ifdef([AT_case_arg],[m4_undefine([AT_case_arg])])dnl
m4_foreach([AT_option], m4_split(m4_normalize([$1]),[[ \|]+]),
[m4_define_default([AT_first_option],AT_option)dnl
m4_append([AT_case],m4_if(m4_len(AT_option),1,[],[-])[-]AT_option, [ | ])dnl
m4_append([AT_case_no],[--no]AT_option, [ | ])dnl
m4_append([AT_case_arg],
          m4_if(m4_len(AT_option),1,[],[-])[-]AT_option[=*], [ | ])dnl
])dnl m4_foreach AT_option
dnl keep track so we or the user may process ACTION-IF-NOT-GIVEN
m4_divert_once([PARSE_ARGS_BEGIN],
[
##
## Set up package specific options.
##
])dnl
m4_divert_text([PARSE_ARGS_BEGIN],
[dnl Provide a default value for options without arguments.
m4_ifvaln([$3],,[at_arg_[]m4_bpatsubst([AT_first_option], -, _)=false])dnl
at_arg_given_[]m4_bpatsubst([AT_first_option], -, _)=false
])dnl m4_divert_text DEFAULTS
m4_divert_text([PARSE_ARGS],
[dnl Parse the options and args when necessary.
m4_ifvaln([$3],
[    AT_case )
        at_prev=--m4_bpatsubst([AT_first_option], -, _)
        ;;
    AT_case_arg )
        at_arg_[]m4_bpatsubst([AT_first_option], -, _)=$at_optarg
        at_arg_given_[]m4_bpatsubst([AT_first_option], -, _)=:
        $4
        ;;],
[    AT_case )
        at_optarg=:
        at_arg_[]m4_bpatsubst([AT_first_option], -, _)=:
        at_arg_given_[]m4_bpatsubst([AT_first_option], -, _)=:
        m4_ifval([$4],[$4])dnl
        ;;
    AT_case_no )
        at_optarg=false
        at_arg_[]m4_bpatsubst([AT_first_option], -, _)=false
        at_arg_given_[]m4_bpatsubst([AT_first_option], -, _)=:
        m4_ifval([$4],[$4])dnl
        ;;])dnl m4_ifvaln $3
])dnl m4_divert_text PARSE_ARGS
m4_ifvaln([$5],
[m4_divert_once([PARSE_ARGS_END],
[
##
## Process package specific options when _not_ supplied.
##])dnl m4_divert_once PARSE_ARGS_END
m4_divert_text([PARSE_ARGS_END],
[
AS_IF([$at_arg_given_[]m4_bpatsubst([AT_first_option], -, _)],,[$5])dnl
])dnl m4_divert_text PARSE_ARGS_END
])dnl m4_ifvaln $5
])dnl _AT_ARG_OPTION


# AT_ARG_OPTION(OPTIONS,HELP-TEXT,[ACTION-IF-GIVEN],[ACTION-IF-NOT-GIVEN])
# ------------------------------------------------------------------------
# Accept a set of OPTIONS with arguments.  Add HELP-TEXT to the HELP_OTHER
# diversion.
#
# Preceding dashes should not be passed into OPTIONS.  Users will be required
# to pass `--' before long options and `-' before single character options.
#
# $at_arg_OPTION will be set to `:' if this option is received, `false' if
# if --noOPTION is received, and `false' by default.
#
# Run ACTION-IF-GIVEN each time an option in OPTIONS is encountered with
# $at_optarg set to `:' or `false' as appropriate.  $at_optarg is actually
# just a copy of $at_arg_OPTION.
#
# ACTION-IF-NOT-GIVEN will be run once after option parsing is complete
# if no option from OPTIONS was found.
m4_defun([AT_ARG_OPTION],[_AT_ARG_OPTION([$1],[$2],,[$3],[$4])])


# AT_ARG_OPTION_ARG(OPTIONS,HELP-TEXT,[ACTION-IF-GIVEN],[ACTION-IF-NOT-GIVEN])
# ---------------------------------------------------------------------------
# Accept a set of OPTIONS with arguments, seperated by commas.  Add HELP-TEXT
# to the HELP_OTHER diversion.
#
# Preceding dashes should not be passed into OPTIONS.  Users will be required
# to pass `--' before long options and `-' before single character options.
#
# By default, any argument to these options will be assigned to the shell
# variable $at_arg_OPTION, where OPTION is the first option in OPTIONS with
# any `-' characters replaced with `_'.
#
# Run ACTION-IF-GIVEN each time an option in OPTIONS is encountered with
# $at_optarg set.  $at_optarg is actually just a copy of $at_arg_OPTION.
#
# ACTION-IF-NOT-GIVEN will be run once after option parsing is complete
# if no option from OPTIONS was found.
m4_defun([AT_ARG_OPTION_ARG],[_AT_ARG_OPTION([$1],[$2],1,[$3],[$4])])


# AT_TESTED(PROGRAMS)
# -------------------
# Specify the list of programs exercised by the test suite.  Their
# versions are logged, and in the case of embedded test suite, they
# must correspond to the version of the package.  PATH should be
# already preset so the proper executable will be selected.
m4_define([AT_TESTED],
[m4_append_uniq_w([AT_tested], [$1])])


# AT_COPYRIGHT(TEXT, [FILTER = m4_newline])
# -----------------------------------------
# Emit TEXT, a copyright notice, in the top of the test suite and in
# --version output.  Macros in TEXT are evaluated once.  Process
# the --version output through FILTER (m4_newline, m4_do, and
# m4_copyright_condense are common filters).
m4_define([AT_COPYRIGHT],
[AS_COPYRIGHT([$1])[]]dnl
[m4_divert_text([VERSION_NOTICES],
[m4_default([$2], [m4_newline])([$1])])])# AT_COPYRIGHT


# AT_SETUP(DESCRIPTION)
# ---------------------
# Start a group of related tests, all to be executed in the same subshell.
# The group is testing what DESCRIPTION says.
_AT_DEFINE_INIT([AT_SETUP],
[m4_ifdef([AT_ingroup], [m4_fatal([$0: nested AT_SETUP detected])],
  [m4_define([AT_ingroup], [AS_ECHO(["$at_setup_line"]) >"$at_check_line_file"
])])
m4_ifdef([AT_keywords], [m4_undefine([AT_keywords])])
m4_define([AT_capture_files], [])
m4_define([AT_line], AT_LINE)
m4_define([AT_xfail], [at_xfail=no])
m4_define([AT_description], m4_expand([$1]))
m4_define([AT_ordinal], m4_incr(AT_ordinal))
m4_append([AT_groups_all], [ ]m4_defn([AT_ordinal]))
m4_divert_push([TEST_GROUPS])dnl
[#AT_START_]AT_ordinal
@%:@ AT_ordinal. m4_defn([AT_line]): m4_defn([AT_description])
at_setup_line='m4_defn([AT_line])'
m4_if(AT_banner_ordinal, [0], [], [at_fn_banner AT_banner_ordinal
])dnl
at_desc="AS_ESCAPE(m4_dquote(m4_defn([AT_description])))"
at_desc_line=m4_format(["%3d: $at_desc%*s"], AT_ordinal,
  m4_max(0, m4_eval(47 - m4_qlen(m4_defn([AT_description])))), [])
$at_quiet AS_ECHO_N(["$at_desc_line"])
m4_divert_push([TEST_SCRIPT])dnl
])


# AT_XFAIL_IF(SHELL-EXPRESSION)
# -----------------------------
# Set up the test to be expected to fail if SHELL-EXPRESSION evaluates to
# true (exitcode = 0).
_AT_DEFINE_SETUP([AT_XFAIL_IF],
[dnl
dnl Try to limit the amount of conditionals that we emit.
m4_case([$1],
      [], [],
      [false], [],
      [:], [m4_define([AT_xfail], [at_xfail=yes])],
      [true], [m4_define([AT_xfail], [at_xfail=yes])],
      [m4_append([AT_xfail], [
      $1 && at_xfail=yes])])])


# AT_KEYWORDS(KEYWORDS)
# ---------------------
# Declare a list of keywords associated to the current test group.
# Since the -k option is case-insensitive, the list is stored in lower case
# to avoid duplicates that differ only by case.
_AT_DEFINE_SETUP([AT_KEYWORDS],
[m4_append_uniq_w([AT_keywords], m4_tolower(m4_dquote(_m4_expand([$1
]))))])


# AT_CAPTURE_FILE(FILE)
# ---------------------
# If the current test group does not behave as expected, save the contents of
# FILE in the test suite log.
_AT_DEFINE_SETUP([AT_CAPTURE_FILE],
[m4_append_uniq([AT_capture_files], ["$1"], [ \
])])


# AT_CLEANUP
# ----------
# Complete a group of related tests.
_AT_DEFINE_INIT([AT_CLEANUP],
[m4_ifdef([AT_ingroup], [AT_ingroup[]_m4_undefine([AT_ingroup])],
  [m4_fatal([$0: missing AT_SETUP detected])])dnl
m4_append([AT_help_all],
m4_defn([AT_ordinal]);m4_defn([AT_line]);m4_defn([AT_description]);dnl
m4_ifdef([AT_keywords], [m4_defn([AT_keywords])]);
)dnl
m4_divert_pop([TEST_SCRIPT])dnl Back to TEST_GROUPS
AT_xfail
echo "#                             -*- compilation -*-" >> "$at_group_log"
(
  AS_ECHO(["AT_ordinal. m4_defn([AT_line]): testing $1..."])
  $at_traceon
m4_undivert([TEST_SCRIPT])dnl Insert the code here
  set +x
  $at_times_p && times >"$at_times_file"
) AS_MESSAGE_LOG_FD>&1 2>&1 | eval $at_tee_pipe
read at_status <"$at_status_file"
[#AT_STOP_]AT_ordinal
m4_divert_pop([TEST_GROUPS])dnl Back to KILL.
])# AT_CLEANUP


# AT_BANNER([TEXT])
# -----------------
# Start a category of related test groups.  If multiple groups are executed,
# output TEXT as a banner without any shell expansion, prior to any test
# from the category.  If TEXT is empty, no banner is printed.
_AT_DEFINE_INIT([AT_BANNER],
[m4_ifdef([AT_ingroup], [m4_fatal([$0: nested AT_SETUP detected])])dnl
m4_define([AT_banner_ordinal], m4_incr(AT_banner_ordinal))
m4_divert_text([BANNERS],
[@%:@ Banner AT_banner_ordinal. AT_LINE
@%:@ Category starts at test group m4_incr(AT_ordinal).
at_banner_text_[]AT_banner_ordinal="AS_ESCAPE([$1])"])dnl
])# AT_BANNER


# AT_DATA(FILE, CONTENTS)
# -----------------------
# Initialize an input data FILE with given CONTENTS, which should end with
# an end of line.
# This macro is not robust to active symbols in CONTENTS *on purpose*.
# If you don't want CONTENTS to be evaluated, quote it twice.
_AT_DEFINE_SETUP([AT_DATA],
[cat >$1 <<'_ATEOF'
$2[]_ATEOF
])


# AT_CHECK(COMMANDS, [STATUS = 0], STDOUT, STDERR,
#          [RUN-IF-FAIL], [RUN-IF-PASS])
# ------------------------------------------------
# Execute a test by performing given shell COMMANDS.  These commands
# should normally exit with STATUS, while producing expected STDOUT and
# STDERR contents.  Shell metacharacters in STDOUT and STDERR are
# _not_ processed by the shell, but are treated as string literals.
#
# STATUS, STDOUT, and STDERR are not checked if equal to `ignore'.
#
# If STDOUT is `expout', then stdout is compared to the content of the file
# `expout'.  Likewise for STDERR and `experr'.
#
# If STDOUT is `stdout', then the stdout is left in the file `stdout',
# likewise for STDERR and `stderr'.  Don't do this:
#
#    AT_CHECK([command >out])
#    # Some checks on `out'
#
# do this instead:
#
#    AT_CHECK([command], [], [stdout])
#    # Some checks on `stdout'
#
# You might wonder why you can't just use `ignore', then directly use stdout
# and stderr left by the test suite:
#
#    AT_CHECK([command], [], [ignore])
#    AT_CHECK([check stdout])
#
# If the test suite always captured data in the file `stdout', then the
# second command would be trying to read and write from the same file, with
# undefined behavior.  Therefore, the test suite actually captures data in
# an internal file of a different name, and only creates `stdout' when
# explicitly requested.
#
# Any line of stderr starting with leading blanks and a `+' are filtered
# out, since most shells when tracing include subshell traces in stderr.
# This may cause spurious failures when the test suite is run with `-x'.
#
_AT_DEFINE_SETUP([AT_CHECK],
[_AT_CHECK(m4_expand([$1]), [$2], AS_ESCAPE(m4_dquote(m4_expand([$3]))),
  AS_ESCAPE(m4_dquote(m4_expand([$4]))), [$5], [$6])])

# AT_CHECK_UNQUOTED(COMMANDS, [STATUS = 0], STDOUT, STDERR,
#                   [RUN-IF-FAIL], [RUN-IF-PASS])
# ---------------------------------------------------------
# Like AT_CHECK, but do not AS_ESCAPE shell metacharacters in the STDOUT
# and STDERR arguments before running the comparison.
_AT_DEFINE_SETUP([AT_CHECK_UNQUOTED],
[_AT_CHECK(m4_expand([$1]), [$2], AS_ESCAPE(m4_dquote(m4_expand([$3])), [""]),
  AS_ESCAPE(m4_dquote(m4_expand([$4])), [""]), [$5], [$6])])

# AT_CHECK_NOESCAPE(COMMANDS, [STATUS = 0], STDOUT, STDERR,
#                   [RUN-IF-FAIL], [RUN-IF-PASS])
# ---------------------------------------------------------
# Obsolete spelling of AT_CHECK_UNQUOTED.
m4_define([AT_CHECK_NOESCAPE],
[m4_warn([obsolete], [consider using AT_CHECK_UNQUOTED instead of $0])]dnl
[_AT_CHECK(m4_expand([$1]), [$2], m4_expand([$3]),
  m4_expand([$4]), [$5], [$6])])


# _AT_DECIDE_TRACEABLE(COMMANDS)
# ------------------------------
# Worker for _AT_CHECK that expands to shell code.  If COMMANDS are safe to
# trace with `set -x', the shell code will evaluate to true.  Otherwise,
# the shell code will print a message stating an aspect of COMMANDS that makes
# tracing them unsafe, and evaluate to false.
#
# Tracing COMMANDS is not safe if they contain a command that spans multiple
# lines.  When the test suite user passes `-x' or `--trace', the test suite
# precedes every command with a `set -x'.  Since most tests expect a specific
# stderr, if only to confirm that it is empty, the test suite filters ^+ from
# the captured stderr before comparing with the expected stderr.  If a command
# spans multiple lines, so will its trace, but a `+' only prefixes the first
# line of that trace:
#
# $ echo 'foo
# bar'
# => stdout
# foo
# bar
# => stderr
# + foo
# bar
#
# In a subset of cases, one could filter such extended shell traces from
# stderr.  Since test commands spanning several lines are rare, I chose
# instead to simply not trace COMMANDS that could yield multiple trace lines.
# Distinguishing such COMMANDS became the task at hand.
#
# These features may cause a shell command to span multiple lines:
#
# (a) A quoted literal newline.
# Example:
#   echo foo'
#   'bar
# M4 is a hostile language for the job of parsing COMMANDS to determine whether
# each literal newline is quoted, so we simply disable tracing for all COMMANDS
# that bear literal newlines.
#
# (b) A command substitution not subject to word splitting.
# Example:
#   var=$(printf 'foo\nbar')
# Example:
#   echo "`printf 'foo\\nbar`"
# One cannot know in general the number of lines a command substitution will
# yield without executing the substituted command.  As such, we disable tracing
# for all COMMANDS containing these constructs.
#
# (c) A parameter expansion not subject to word splitting.
# Example:
#   var=foo'
#   'bar
#   echo "$var"
# Parameter expansions appear in COMMANDS with much greater frequency than do
# newlines and command substitutions, so disabling tracing for all such
# COMMANDS would much more substantially devalue `testsuite -x'.  To determine
# which parameter expansions yield multiple lines, we escape all ``', `"',
# and `\' in a copy of COMMANDS and expand that string within double quotes
# at runtime.  If the result of that expansion contains multiple lines, the
# test suite disables tracing for the command in question.
#
# This method leads the test suite to expand some parameters that the shell
# itself will never expand due to single-quotes or backslash escapes.  This is
# not a problem for `$foo' expansions, which will simply yield the empty string
# or some unrelated value.  A `${...}' expansion could actually form invalid
# shell code, however; consider `${=foo}'.  Therefore, we disable tracing for
# all COMMANDS containing `${...}'.  This affects few COMMANDS.
#
# This macro falls in a very hot path; the Autoconf test suite expands it 1640
# times as of this writing.  To give a sense of the impact of the heuristics I
# just described, the test suite preemptively disables tracing for 31 of those,
# and 268 contain parameter expansions that require runtime evaluation.  The
# balance are always safe to trace.
m4_define([_AT_DECIDE_TRACEABLE],
dnl Utility macro.
dnl
dnl Examine COMMANDS for a reason to never trace COMMANDS.
[m4_pushdef([at_reason],
m4_cond([m4_eval(m4_index([$1], [`]) >= 0)], [1],
                [[a `...` command substitution]],
        [m4_eval(m4_index([$1], [$(]) >= 0)], [1],
                [[a $(...) command substitution]],
        [m4_eval(m4_index([$1], [${]) >= 0)], [1],
                [[a ${...} parameter expansion]],
        [m4_eval(m4_index([$1], m4_newline) >= 0)], [1],
                [[an embedded newline]],
        []))]dnl No reason.
[m4_if(m4_index(_m4_defn([at_reason]), [a]), [0],]dnl
dnl We know at build time that tracing COMMANDS is never safe.
[[at_fn_check_prepare_notrace 'm4_defn([at_reason])'],dnl
       m4_index([$1], [$]), [-1],]dnl
dnl We know at build time that tracing COMMANDS is always safe.
[[at_fn_check_prepare_trace],]dnl
dnl COMMANDS may contain parameter expansions; expand them at runtime.
[[at_fn_check_prepare_dynamic "AS_ESCAPE([[$1]], [`\"])"])[]]dnl
[_m4_popdef([at_reason])])


# AT_DIFF_STDERR/AT_DIFF_STDOUT
# -----------------------------
# These are subroutines of AT_CHECK.  Using indirect dispatch is a tad
# faster than using m4_case, and these are called very frequently.
m4_define([AT_DIFF_STDERR(stderr)],
          [echo stderr:; tee stderr <"$at_stderr"])
m4_define([AT_DIFF_STDERR(stderr-nolog)],
          [echo stderr captured; cp "$at_stderr" stderr])
m4_define([AT_DIFF_STDERR(ignore)],
          [echo stderr:; cat "$at_stderr"])
m4_define([AT_DIFF_STDERR(ignore-nolog)])
m4_define([AT_DIFF_STDERR(experr)],
          [$at_diff experr "$at_stderr" || at_failed=:])
m4_define([AT_DIFF_STDERR()],
          [at_fn_diff_devnull "$at_stderr" || at_failed=:])

m4_define([AT_DIFF_STDOUT(stdout)],
          [echo stdout:; tee stdout <"$at_stdout"])
m4_define([AT_DIFF_STDOUT(stdout-nolog)],
          [echo stdout captured; cp "$at_stdout" stdout])
m4_define([AT_DIFF_STDOUT(ignore)],
          [echo stdout:; cat "$at_stdout"])
m4_define([AT_DIFF_STDOUT(ignore-nolog)])
m4_define([AT_DIFF_STDOUT(expout)],
          [$at_diff expout "$at_stdout" || at_failed=:])
m4_define([AT_DIFF_STDOUT()],
          [at_fn_diff_devnull "$at_stdout" || at_failed=:])

# _AT_CHECK(COMMANDS, [STATUS = 0], STDOUT, STDERR,
#           [RUN-IF-FAIL], [RUN-IF-PASS])
# -------------------------------------------------
# Worker for AT_CHECK and AT_CHECK_UNQUOTED, with COMMANDS, STDOUT, and
# STDERR pre-expanded.
#
# Implementation Details
# ----------------------
# Ideally, we would like to run
#
#    ( $at_traceon; COMMANDS >at-stdout 2> at-stderr )
#
# but we must group COMMANDS as it is not limited to a single command, and
# then the shells will save the traces in at-stderr. So we have to filter
# them out when checking stderr, and we must send them into the test suite's
# stderr to honor -x properly. Since only the first line of the trace of a
# multiline command starts with a `+', and I know of no straightforward way to
# filter out the unadorned trace lines, we disable shell tracing entirely for
# commands that could span multiple lines.
#
# Limiting COMMANDS to a single command is not good either, since then
# the user herself would use {} or (), and then we face the same problem.
#
# But then, there is no point in running
#
#   ( $at_traceon { $1 ; } >at-stdout 2>at-stder1 )
#
# instead of the simpler
#
#  ( $at_traceon; $1 ) >at-stdout 2>at-stder1
#
# Note that we truncate and append to the output files, to avoid losing
# output from multiple concurrent processes, e.g., an inner testsuite
# with parallel jobs.
m4_define([_AT_CHECK],
[m4_define([AT_ingroup])]dnl
[{ set +x
AS_ECHO(["$at_srcdir/AT_LINE: AS_ESCAPE([[$1]])"])
_AT_DECIDE_TRACEABLE([$1]) "AS_ESCAPE(m4_dquote(AT_LINE))"
( $at_check_trace; [$1]
) >>"$at_stdout" 2>>"$at_stderr"
at_status=$? at_failed=false
$at_check_filter
m4_ifdef([AT_DIFF_STDERR($4)], [m4_indir([AT_DIFF_STDERR($4)])],
  [echo >>"$at_stderr"; AS_ECHO([["$4"]]) | \
  $at_diff - "$at_stderr" || at_failed=:])
m4_ifdef([AT_DIFF_STDOUT($3)], [m4_indir([AT_DIFF_STDOUT($3)])],
  [echo >>"$at_stdout"; AS_ECHO([["$3"]]) | \
  $at_diff - "$at_stdout" || at_failed=:])
m4_if([$2], [ignore], [at_fn_check_skip],
  [at_fn_check_status m4_default([$2], [0])]) $at_status "$at_srcdir/AT_LINE"
m4_ifvaln([$5$6], [AS_IF($at_failed, [$5], [$6])])]dnl
[$at_failed && at_fn_log_failure AT_capture_files
$at_traceon; }
])# _AT_CHECK