tests/local.at - external/github.com/Distrotech/autoconf - Git at Google

 # M4 macros used in building Autoconf test suites.        -*- Autotest -*-

 # Copyright (C) 2000-2015 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 3 of the License, 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 <http://www.gnu.org/licenses/>.

 m4_version_prereq([2.57])

 # Used in many tests.
 m4_pattern_allow([^AS_EXIT$])
 m4_pattern_allow([^m4_(define|shift)$])

 # Programs this package provides
 AT_TESTED([autom4te autoconf autoheader autoupdate autoreconf ifnames])

 # Enable colored test output.
 AT_COLOR_TESTS

 ## ---------------- ##
 ## Utility macros.  ##
 ## ---------------- ##

 # AT_CMP(FILE-1, FILE-2)
 # ----------------------
 # Check FILE-1 and FILE-2 for equality, like `cmp FILE-1 FILE-2'.
 m4_define([AT_CMP],
 [m4_ifval([$2],, [m4_fatal([AT_CMP takes two arguments.])])[]dnl
 AT_CHECK([$at_diff "$1" "$2"])
 ])# AT_CMP


 ## ---------------- ##
 ## Testing syntax.  ##
 ## ---------------- ##

 # AT_CHECK_SHELL_SYNTAX(PROGRAM)
 # ------------------------------
 # If the shell handles `-n' well, use it to check the syntax of PROGRAM;
 # otherwise, do nothing.  ksh93 -n also spits outs loads of warnings
 # about older constructs, but we don't care about the warnings.
 m4_define([AT_CHECK_SHELL_SYNTAX],
 [AT_SKIP_IF([test "$ac_cv_sh_n_works" != yes])
 AT_CHECK([/bin/sh -n $1], [], [], [ignore])])

 m4_define([AT_CHECK_PERL_SYNTAX],
 [AT_CHECK([autom4te_perllibdir=$abs_top_srcdir/lib $PERL -c "$abs_top_builddir"/bin/$1],
           0, [], [ignore])])

 ## ------------------ ##
 ## Testing autom4te.  ##
 ## ------------------ ##


 # AT_CHECK_M4(COMMAND, [EXIT-STATUS = 0], STDOUT, STDERR)
 # -------------------------------------------------------
 # If stderr is specified, normalize the observed stderr.
 # This (using GNU M4 1.4.6)
 #
 #  /usr/local/bin/m4:script.4s:1: cannot open `foo': No such file or directory
 #  autom4te: /usr/local/bin/m4 failed with exit status: 1
 #
 # or this (GNU M4 1.4.11)
 #
 #  /usr/local/bin/m4:script.4s:1: include: cannot open `foo': No such file or directory
 #  autom4te: /usr/local/bin/m4 failed with exit status: 1
 #
 # or this (GNU M4 1.4 installed as gm4)
 #
 #  script.4s:1: /usr/local/bin/gm4: Cannot open foo: No such file or directory
 #  autom4te: /usr/local/bin/gm4 failed with exit status: 1
 #
 # or this (GNU M4 1.4.13 installed as m4-1.4.13):
 #
 #  /usr/bin/m4-1.4.13:script.4s:1: include: cannot open `foo': No such file or directory
 #  autom4te: /usr/bin/m4-1.4.13 failed with exit status: 1
 #
 # becomes
 #
 #  m4:script.4s:1: cannot open `foo': No such file or directory
 #  autom4te: m4 failed with exit status: 1
 #
 # We use the following sed patterns:
 #
 #     (m4): ?(file): ?(line):
 # or  (file): ?(line): ?(m4):
 # to  m4:(file):(line):
 #
 # and
 #     m4:(file):(line): Cannot open foo:
 # or  m4:(file):(line): include: cannot open `foo':
 # to  m4:(file):(line): cannot open `foo':
 #
 # and
 #     autom4te: [^ ]m4
 # or  autom4te: [^ ]m4.exe
 # to  autom4te: m4
 #
 # Moreover, DJGPP error messages include the error code in brackets;
 # remove the error code during normalization.
 #
 m4_define([AT_CHECK_M4],
 [AT_CHECK([$1], [$2], [$3],
           m4_case([$4], [], [], [ignore], [ignore], [stderr]))
 m4_case([$4], [], [], [ignore], [],
 [AT_CHECK([[mv stderr stderr-raw &&
    sed 's/^[^:]*m4[-.ex0-9]*: *\([^:]*:\) *\([0-9][0-9]*: \)/m4:\1\2/
 	s/^\([^:]*:\) *\([0-9][0-9]*:\)[^:]*m4[-.ex0-9]*: /m4:\1\2 /
 	s/: C\(annot open \)\([^`:]*\):/: c\1`\2'\'':/
 	s/: include:\( cannot open\)/:\1/
 	s/^autom4te: [^ ]*m4[.ex]* /autom4te: m4 /
 	s/ (E[A-Z]*)$//
     ' stderr-raw >&2]], [0], [], [$4])])
 ])

 # AT_CHECK_AUTOM4TE(FLAGS, [EXIT-STATUS = 0], STDOUT, STDERR)
 # -----------------------------------------------------------
 m4_define([AT_CHECK_AUTOM4TE],
 [AT_CHECK_M4([autom4te $1], [$2], [$3], [$4])])


 ## ----------------- ##
 ## Testing M4sugar.  ##
 ## ----------------- ##


 # AT_DATA_M4SUGAR(FILE-NAME, CONTENTS)
 # ------------------------------------
 # Escape the invalid tokens with @&t@.
 m4_define([AT_DATA_M4SUGAR],
 [AT_DATA([$1],
 [m4_bpatsubst([$2], [\(@.\)\(.@\)\|\(m4\)\(_\)\|\(d\)\(nl\)],
               [\1\3\5@&t@\2\4\6])])])


 # AT_CHECK_M4SUGAR(FLAGS, [EXIT-STATUS = 0], STDOUT, STDERR)
 # ----------------------------------------------------------
 m4_define([AT_CHECK_M4SUGAR],
 [AT_KEYWORDS([m4sugar])
 AT_CHECK_AUTOM4TE([--language=m4sugar script.4s -o script $1],
 	           [$2], [$3], [$4])])


 ## -------------- ##
 ## Testing M4sh.  ##
 ## -------------- ##


 # AT_DATA_M4SH(FILE-NAME, CONTENTS)
 # ---------------------------------
 # Escape the invalid tokens with @&t@.
 m4_define([AT_DATA_M4SH],
 [AT_DATA([$1],
 [m4_bpatsubst([$2], [\(@.\)\(.@\)\|\(m4\|AS\)\(_\)\|\(d\)\(nl\)],
               [\1\3\5@&t@\2\4\6])])])


 # AT_CHECK_M4SH(FLAGS, [EXIT-STATUS = 0], STDOUT, STDERR)
 # -------------------------------------------------------
 m4_define([AT_CHECK_M4SH],
 [AT_CHECK_AUTOM4TE([--language=m4sh script.as -o script $1],
 	           [$2], [$3], [$4])])


 ## ------------------ ##
 ## Testing Autoconf.  ##
 ## ------------------ ##


 # AT_DATA_AUTOCONF(FILE-NAME, CONTENTS)
 # -------------------------------------
 # Escape the invalid tokens with @&t@.
 m4_define([AT_DATA_AUTOCONF],
 [AT_DATA([$1],
 [m4_bpatsubst([$2], [\(@.\)\(.@\)\|\(m4\|AS\|AC\)\(_\)\|\(d\)\(nl\)],
               [\1\3\5@&t@\2\4\6])])])


 # AT_CONFIGURE_AC(BODY)
 # ---------------------
 # Create a full configure.ac running BODY, with a config header set up,
 # AC_OUTPUT, and environment checking hooks.
 m4_define([AT_CONFIGURE_AC],
 [AT_DATA([configure.ac],
 [[AC_INIT
 AC_CONFIG_HEADERS(config.h:config.hin)
 AC_STATE_SAVE(before)]
 $1
 [AC_OUTPUT
 AC_STATE_SAVE(after)
 ]])
 cp "$abs_top_srcdir/build-aux/install-sh" \
    "$abs_top_srcdir/build-aux/config.guess" \
    "$abs_top_srcdir/build-aux/config.sub" .
 cp "$abs_top_srcdir/tests/statesave.m4" aclocal.m4
 ])# AT_CONFIGURE_AC


 # AT_CHECK_AUTOCONF(ARGS, [EXIT-STATUS = 0], STDOUT, STDERR)
 # ----------------------------------------------------------
 # We always use "--force", to prevent problems with timestamps if the testsuite
 # were running too fast.
 m4_define([AT_CHECK_AUTOCONF],
 [AT_CHECK_M4([autoconf --force $1], [$2], [$3], [$4])
 if test -s configure && test "$ac_cv_sh_n_works" = yes; then
   AT_CHECK_SHELL_SYNTAX([configure])
 fi
 ])


 # AT_CHECK_AUTOHEADER(ARGS, [EXIT-STATUS = 0], STDOUT, STDERR)
 # ------------------------------------------------------------
 m4_define([AT_CHECK_AUTOHEADER],
 [AT_CHECK([autoheader $1], [$2], [$3], [$4])
 ])


 # AT_CHECK_CONFIGURE(END-COMMAND,
 #                    [EXIT-STATUS = 0],
 #                    [STDOUT = IGNORE], STDERR)
 # ---------------------------------------------
 # `abs_top_srcdir' is needed so that `./configure' finds install-sh.
 # Using --srcdir is more expensive.
 m4_define([AT_CHECK_CONFIGURE],
 [AT_CAPTURE_FILE([config.log])[]dnl
  AT_CHECK([./configure $configure_options $1],
 	  [$2],
 	  m4_default([$3], [ignore]), [$4])])


 # AT_CHECK_ENV
 # ------------
 # Check that the full configure run remained in its variable name space,
 # and cleaned up tmp files.
 #
 # Perhaps grep -E is not supported, or perhaps it chokes on such a big regex.
 # In this case just don't pay attention to the env.  It would be great
 # to keep the error message but we can't: that would break AT_CHECK.
 #
 # FreeBSD sh may intermingle the trace output from the egrep and grep
 # commands in the pipe, so turn off tracing for these.
 #
 # Some tests might exit prematurely when they find a problem, in
 # which case `env-after' is probably missing.  Don't check it then.
 #
 # Here are the variables `configure' may modify during execution:
 # - ^as_
 #   M4sh's shell name space.
 # - ^ac_
 #   Autoconf's shell name space.
 # - prefix and exec_prefix
 #   are kept undefined (NONE) until AC_OUTPUT which then sets them to
 #   `/usr/local' and `${prefix}' for make.
 # - (host|build|target)(_(alias|cpu|vendor|os))?
 #   Set by AC_CANONICAL_(HOST|BUILD|TARGET).
 # - cross_compiling
 #   Set by AC_INIT.
 # - interpval
 #   Set by AC_SYS_INTERPRETER.
 # - CONFIG_STATUS and DEFS
 #   Set by AC_OUTPUT.
 # - AC_SUBST'ed variables
 #   (FIXME: Generate a list of these automatically.)
 # - _|@|.[*#?$].|argv|ARGC|LINENO|OLDPWD|PIPESTATUS|RANDOM|SECONDS
 #   Some variables some shells use and change.
 #   `.[*#?$].' catches `$#' etc. which are displayed like this:
 #      | '!'=18186
 #      | '#'=0
 #      | '$'=6908
 #
 m4_define([AT_CHECK_ENV],
 [m4_divert_once([PREPARE_TESTS], [_AT_CHECK_ENV])dnl
 AT_CHECK([at_check_env])])
 m4_define([_AT_CHECK_ENV],
 [AS_FUNCTION_DESCRIBE([at_check_env], [],
 [Compare the directory and environment state both before and after a run,
 and return non-zero status if they differ inappropriately.])
 at_check_env ()
 {
 # Compare directory listings.
 test -f state-ls.before ||
   AS_ERROR([state-ls.before not present])
 test -f state-ls.after \
   && { $at_diff state-ls.before state-ls.after || return 1; }
 # Compare variable space dumps.
 if test -f state-env.before && test -f state-env.after; then
   set +x
   grep_failed=false
   for act_file in state-env.before state-env.after
   do
     ($EGREP -v '^(m4_join([|],
       [a[cs]_.*],
       [(exec_)?prefix|DEFS|CONFIG_STATUS],
       [CC|CFLAGS|CPP|GCC|CXX|CXXFLAGS|CXXCPP|GXX|F77|FFLAGS|FLIBS|G77],
       [ERL|ERLC|ERLCFLAGS|ERLANG_PATH_ERL|ERLANG_ROOT_DIR|ERLANG_LIB_DIR],
       [ERLANG_LIB_DIR_.*|ERLANG_LIB_VER_.*|ERLANG_INSTALL_LIB_DIR],
       [ERLANG_INSTALL_LIB_DIR_.*|ERLANG_ERTS_VER|OBJC|OBJCPP|OBJCFLAGS],
       [OBJCXX|OBJCXXCPP|OBJCXXFLAGS],
       [GOC|GOFLAGS],
       [OPENMP_CFLAGS],
       [LIBS|LIB@&t@OBJS|LTLIBOBJS|LDFLAGS],
       [INSTALL(_(DATA|PROGRAM|SCRIPT))?],
       [CYGWIN|ISC|MINGW32|MINIX|EMXOS2|XENIX|EXEEXT|OBJEXT],
       [X_(CFLAGS|(EXTRA_|PRE_)?LIBS)|x_(includes|libraries)|(have|no)_x],
       [(host|build|target)(_(alias|cpu|vendor|os))?],
       [cross_compiling|U],
       [interpval|PATH_SEPARATOR],
       [GFC|F77_DUMMY_MAIN|f77_(case|underscore)],
       [FC(_DUMMY_MAIN|FLAGS|LIBS|FLAGS_[fF]|_MODEXT|_MODINC|_MODOUT|_DEFINE)?],
       [ALLOCA|GETLOADAVG_LIBS|KMEM_GROUP|NEED_SETGID|POW_LIB],
       [AWK|LEX|LEXLIB|LEX_OUTPUT_ROOT|LN_S|M4|MKDIR_P|RANLIB|SET_MAKE|YACC],
       [GREP|[EF]GREP|SED],
       [[_@]|.[*#?$].],
       [argv|ARGC|LINENO|OLDPWD|PIPESTATUS|RANDOM|SECONDS]))=' \
      $act_file ||
        test $? -eq 1 || echo failed >&2
     ) 2>stderr-$act_file |
       # There may be variables spread on several lines; remove latter lines.
       $GREP '^m4_defn([m4_re_word])=' >clean-$act_file ||
         test $? -eq 1 || grep_failed=:
     test -s stderr-$act_file && grep_failed=:
   done
   $at_traceon
   $grep_failed || $at_diff clean-state-env.before clean-state-env.after
 fi
 } [#]at_check_env])


 # AT_CONFIG_CMP(VAR-FILE-A, VAR-FILE-B)
 # -------------------------------------
 # Check the outcomes of two configure runs for equality by comparing dumps of
 # their shell variables.  VAR-FILE-A and VAR-FILE-B are two `set'-style shell
 # variable space dumps.
 #
 # We permit variance between runs in the following shell variables:
 # - ^as_
 #   M4sh's shell name space.
 # - ^ac_, excluding ^ac_cv_
 #   Autoconf's private shell name space.
 # - PPID [bash, zsh]
 # - RANDOM [zsh]
 # - SECONDS [zsh]
 # - '$' [zsh]
 # - argv [zsh]
 # - ARGC [zsh]
 #
 # Furthermore, it is okay for a non-cache variable initialized to empty in one
 # run to be unset in another run.  This happens when, for example, cache update
 # code tries a number of values in LIBS and eventually restores LIBS to its
 # original value. If LIBS was previously unset, it will have become set and
 # empty.  (OTOH, cache variables indicate the result of the test even if they
 # are empty, so we have to be strict about them.)
 #
 # Lines that do not look like `foo=bar' are probably latter lines of
 # multiline values; trim them.
 #
 m4_define([AT_CONFIG_CMP],
 [for act_file in $1 $2
 do
   $SED '/^ac_cv_/ b
 	/^m4_defn([m4_re_word])=./ !d
 	/^[[^=]]*='\'''\''$/ d
 	/^a[[cs]]_/ d
 	/^OLDPWD=/ d
 	/^PPID=/ d
 	/^RANDOM=/ d
 	/^SECONDS=/ d
 	/'\'\\\$\''=/ d
 	/^argv=/ d
 	/^ARGC=/ d
 	' $act_file >at_config_vars-$act_file
 done
 AT_CMP([at_config_vars-$1], [at_config_vars-$2])[]dnl
 ])# AT_CONFIG_CMP


 # AT_CHECK_DEFINES(CONTENT)
 # -------------------------
 # Verify that config.h, once stripped, is CONTENT.
 # Stripping consists of keeping CPP lines (i.e. containing a hash),
 # but those of automatically checked features (STDC_HEADERS etc.)
 # and symbols (PACKAGE_...).
 # AT_CHECK_HEADER is a better name, but too close from AC_CHECK_HEADER.
 m4_define([AT_CHECK_DEFINES],
 [AT_CHECK([[sed '/#/!d
 /INTTYPES/d
 /MEMORY/d
 /PACKAGE_/d
 /STDC_HEADERS/d
 /STDINT/d
 /STDLIB/d
 /STRING/d
 /SYS_STAT/d
 /SYS_TYPES/d
 /UNISTD/d' config.h]],,
 	  [$1])])


 # AT_CHECK_AUTOUPDATE
 # -------------------
 m4_define([AT_CHECK_AUTOUPDATE],
 [AT_CHECK([autoupdate $1], [$2], [$3], [$4])
 ])


 # _AT_CHECK_AC_MACRO(AC-BODY, PRE-TESTS)
 # --------------------------------------
 # Create a minimalist configure.ac running the macro named
 # NAME-OF-THE-MACRO, check that autoconf runs on that script,
 # and that the shell runs correctly the configure.
 m4_define([_AT_CHECK_AC_MACRO],
 [AT_CONFIGURE_AC([$1])
 $2
 AT_CHECK_AUTOCONF
 AT_CHECK_AUTOHEADER
 AT_CHECK_CONFIGURE
 AT_CHECK_ENV
 ])# _AT_CHECK_AC_MACRO


 # AT_CHECK_MACRO(MACRO, [MACRO-USE], [ADDITIONAL-CMDS],
 #                [AUTOCONF-FLAGS = -W obsolete])
 # -----------------------------------------------------
 # Create a minimalist configure.ac running the macro named
 # NAME-OF-THE-MACRO, check that autoconf runs on that script,
 # and that the shell runs correctly the configure.
 #
 # We run `configure' twice, both times with a cache, and compare
 # the environment after each run to detect inconsistencies.
 #
 # New macros are not expected to depend upon obsolete macros.
 m4_define([AT_CHECK_MACRO],
 [AT_SETUP([$1])

 AT_CONFIGURE_AC([m4_default([$2], [$1])])

 AT_CHECK_AUTOCONF([m4_default([$4], [-W obsolete])])
 AT_CHECK_AUTOHEADER

 for at_run in r1 r2
 do
     AT_CHECK_CONFIGURE([-C])
     cp -f state-env.after state-env.$at_run
     cp -f config.h config-h.$at_run
     AT_CHECK_ENV
 done

 AT_CMP([config-h.r1], [config-h.r2])
 AT_CONFIG_CMP([state-env.r1], [state-env.r2])

 $3

 AT_CLEANUP[]dnl
 ])# AT_CHECK_MACRO


 # AT_CHECK_MACRO_CROSS(MACRO, [MACRO-USE], [ADDITIONAL-CMDS],
 #                      [AUTOCONF-FLAGS = -W obsolete])
 # -----------------------------------------------------------
 # Like the previous one, but creates two checks: for native
 # compile and for cross-compile.
 m4_define([AT_CHECK_MACRO_CROSS],
 [AT_CHECK_MACRO($@)
 AT_CHECK_MACRO([$1 (cross compile)],
   [AT_KEYWORDS([cross])
   # Exercise the code used when cross-compiling.
   cross_compiling=yes
   ac_tool_warned=yes
   m4_default([$2], [$1])],
   [$3], [$4])
 ])


 # AT_CHECK_AU_MACRO(MACRO)
 # ------------------------
 # Create a minimalist configure.ac running the macro named
 # NAME-OF-THE-MACRO, autoupdate this script, check that autoconf runs
 # on that script, and that the shell runs correctly the configure.
 #
 # Updated configure.ac shall not depend upon obsolete macros, which votes
 # in favor of `-W obsolete', but since many of these macros leave a message
 # to be removed by the user once her code is adjusted, let's not check.
 #
 # Remove config.hin to avoid `autoheader: config.hin is unchanged'.
 m4_define([AT_CHECK_AU_MACRO],
 [AT_SETUP([$1])
 AT_KEYWORDS([autoupdate])

 AT_CONFIGURE_AC([$1])

 AT_CHECK_AUTOCONF
 AT_CHECK_AUTOHEADER
 AT_CHECK_CONFIGURE
 AT_CHECK_ENV

 rm config.hin
 AT_CHECK_AUTOUPDATE([], 0, [], ignore)
 AT_CHECK([grep '^$1$' configure.ac], 1)

 AT_CHECK_AUTOCONF
 AT_CHECK_AUTOHEADER
 AT_CHECK_CONFIGURE
 AT_CHECK_ENV

 AT_CLEANUP[]dnl
 ])# AT_CHECK_AU_MACRO


 ## ----------------------- ##
 ## Launch the test suite.  ##
 ## ----------------------- ##

 AT_INIT
	# M4 macros used in building Autoconf test suites. -- Autotest --

	# Copyright (C) 2000-2015 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 3 of the License, 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 <http://www.gnu.org/licenses/>.

	m4_version_prereq([2.57])

	# Used in many tests.
	m4_pattern_allow([^AS_EXIT$])
	m4_pattern_allow([^m4_(define\|shift)$])

	# Programs this package provides
	AT_TESTED([autom4te autoconf autoheader autoupdate autoreconf ifnames])

	# Enable colored test output.
	AT_COLOR_TESTS

	## ---------------- ##
	## Utility macros. ##
	## ---------------- ##

	# AT_CMP(FILE-1, FILE-2)
	# ----------------------
	# Check FILE-1 and FILE-2 for equality, like `cmp FILE-1 FILE-2'.
	m4_define([AT_CMP],
	[m4_ifval([$2],, [m4_fatal([AT_CMP takes two arguments.])])[]dnl
	AT_CHECK([$at_diff "$1" "$2"])
	])# AT_CMP


	## ---------------- ##
	## Testing syntax. ##
	## ---------------- ##

	# AT_CHECK_SHELL_SYNTAX(PROGRAM)
	# ------------------------------
	# If the shell handles `-n' well, use it to check the syntax of PROGRAM;
	# otherwise, do nothing. ksh93 -n also spits outs loads of warnings
	# about older constructs, but we don't care about the warnings.
	m4_define([AT_CHECK_SHELL_SYNTAX],
	[AT_SKIP_IF([test "$ac_cv_sh_n_works" != yes])
	AT_CHECK([/bin/sh -n $1], [], [], [ignore])])

	m4_define([AT_CHECK_PERL_SYNTAX],
	[AT_CHECK([autom4te_perllibdir=$abs_top_srcdir/lib $PERL -c "$abs_top_builddir"/bin/$1],
	0, [], [ignore])])

	## ------------------ ##
	## Testing autom4te. ##
	## ------------------ ##


	# AT_CHECK_M4(COMMAND, [EXIT-STATUS = 0], STDOUT, STDERR)
	# -------------------------------------------------------
	# If stderr is specified, normalize the observed stderr.
	# This (using GNU M4 1.4.6)
	#
	# /usr/local/bin/m4:script.4s:1: cannot open `foo': No such file or directory
	# autom4te: /usr/local/bin/m4 failed with exit status: 1
	#
	# or this (GNU M4 1.4.11)
	#
	# /usr/local/bin/m4:script.4s:1: include: cannot open `foo': No such file or directory
	# autom4te: /usr/local/bin/m4 failed with exit status: 1
	#
	# or this (GNU M4 1.4 installed as gm4)
	#
	# script.4s:1: /usr/local/bin/gm4: Cannot open foo: No such file or directory
	# autom4te: /usr/local/bin/gm4 failed with exit status: 1
	#
	# or this (GNU M4 1.4.13 installed as m4-1.4.13):
	#
	# /usr/bin/m4-1.4.13:script.4s:1: include: cannot open `foo': No such file or directory
	# autom4te: /usr/bin/m4-1.4.13 failed with exit status: 1
	#
	# becomes
	#
	# m4:script.4s:1: cannot open `foo': No such file or directory
	# autom4te: m4 failed with exit status: 1
	#
	# We use the following sed patterns:
	#
	# (m4): ?(file): ?(line):
	# or (file): ?(line): ?(m4):
	# to m4:(file):(line):
	#
	# and
	# m4:(file):(line): Cannot open foo:
	# or m4:(file):(line): include: cannot open `foo':
	# to m4:(file):(line): cannot open `foo':
	#
	# and
	# autom4te: [^ ]m4
	# or autom4te: [^ ]m4.exe
	# to autom4te: m4
	#
	# Moreover, DJGPP error messages include the error code in brackets;
	# remove the error code during normalization.
	#
	m4_define([AT_CHECK_M4],
	[AT_CHECK([$1], [$2], [$3],
	m4_case([$4], [], [], [ignore], [ignore], [stderr]))
	m4_case([$4], [], [], [ignore], [],
	[AT_CHECK([[mv stderr stderr-raw &&
	sed 's/^[^:]m4[-.ex0-9]: \([^:]:\) \([0-9][0-9]: \)/m4:\1\2/
	s/^\([^:]:\) \([0-9][0-9]:\)[^:]m4[-.ex0-9]*: /m4:\1\2 /
	s/: C\(annot open \)\([^`:]*\):/: c\1`\2'\'':/
	s/: include:\( cannot open\)/:\1/
	s/^autom4te: [^ ]m4[.ex] /autom4te: m4 /
	s/ (E[A-Z]*)$//
	' stderr-raw >&2]], [0], [], [$4])])
	])

	# AT_CHECK_AUTOM4TE(FLAGS, [EXIT-STATUS = 0], STDOUT, STDERR)
	# -----------------------------------------------------------
	m4_define([AT_CHECK_AUTOM4TE],
	[AT_CHECK_M4([autom4te $1], [$2], [$3], [$4])])



	## ----------------- ##
	## Testing M4sugar. ##
	## ----------------- ##


	# AT_DATA_M4SUGAR(FILE-NAME, CONTENTS)
	# ------------------------------------
	# Escape the invalid tokens with @&t@.
	m4_define([AT_DATA_M4SUGAR],
	[AT_DATA([$1],
	[m4_bpatsubst([$2], [\(@.\)\(.@\)\\|\(m4\)\(_\)\\|\(d\)\(nl\)],
	[\1\3\5@&t@\2\4\6])])])


	# AT_CHECK_M4SUGAR(FLAGS, [EXIT-STATUS = 0], STDOUT, STDERR)
	# ----------------------------------------------------------
	m4_define([AT_CHECK_M4SUGAR],
	[AT_KEYWORDS([m4sugar])
	AT_CHECK_AUTOM4TE([--language=m4sugar script.4s -o script $1],
	[$2], [$3], [$4])])



	## -------------- ##
	## Testing M4sh. ##
	## -------------- ##


	# AT_DATA_M4SH(FILE-NAME, CONTENTS)
	# ---------------------------------
	# Escape the invalid tokens with @&t@.
	m4_define([AT_DATA_M4SH],
	[AT_DATA([$1],
	[m4_bpatsubst([$2], [\(@.\)\(.@\)\\|\(m4\\|AS\)\(_\)\\|\(d\)\(nl\)],
	[\1\3\5@&t@\2\4\6])])])


	# AT_CHECK_M4SH(FLAGS, [EXIT-STATUS = 0], STDOUT, STDERR)
	# -------------------------------------------------------
	m4_define([AT_CHECK_M4SH],
	[AT_CHECK_AUTOM4TE([--language=m4sh script.as -o script $1],
	[$2], [$3], [$4])])



	## ------------------ ##
	## Testing Autoconf. ##
	## ------------------ ##


	# AT_DATA_AUTOCONF(FILE-NAME, CONTENTS)
	# -------------------------------------
	# Escape the invalid tokens with @&t@.
	m4_define([AT_DATA_AUTOCONF],
	[AT_DATA([$1],
	[m4_bpatsubst([$2], [\(@.\)\(.@\)\\|\(m4\\|AS\\|AC\)\(_\)\\|\(d\)\(nl\)],
	[\1\3\5@&t@\2\4\6])])])



	# AT_CONFIGURE_AC(BODY)
	# ---------------------
	# Create a full configure.ac running BODY, with a config header set up,
	# AC_OUTPUT, and environment checking hooks.
	m4_define([AT_CONFIGURE_AC],
	[AT_DATA([configure.ac],
	[[AC_INIT
	AC_CONFIG_HEADERS(config.h:config.hin)
	AC_STATE_SAVE(before)]
	$1
	[AC_OUTPUT
	AC_STATE_SAVE(after)
	]])
	cp "$abs_top_srcdir/build-aux/install-sh" \
	"$abs_top_srcdir/build-aux/config.guess" \
	"$abs_top_srcdir/build-aux/config.sub" .
	cp "$abs_top_srcdir/tests/statesave.m4" aclocal.m4
	])# AT_CONFIGURE_AC


	# AT_CHECK_AUTOCONF(ARGS, [EXIT-STATUS = 0], STDOUT, STDERR)
	# ----------------------------------------------------------
	# We always use "--force", to prevent problems with timestamps if the testsuite
	# were running too fast.
	m4_define([AT_CHECK_AUTOCONF],
	[AT_CHECK_M4([autoconf --force $1], [$2], [$3], [$4])
	if test -s configure && test "$ac_cv_sh_n_works" = yes; then
	AT_CHECK_SHELL_SYNTAX([configure])
	fi
	])


	# AT_CHECK_AUTOHEADER(ARGS, [EXIT-STATUS = 0], STDOUT, STDERR)
	# ------------------------------------------------------------
	m4_define([AT_CHECK_AUTOHEADER],
	[AT_CHECK([autoheader $1], [$2], [$3], [$4])
	])


	# AT_CHECK_CONFIGURE(END-COMMAND,
	# [EXIT-STATUS = 0],
	# [STDOUT = IGNORE], STDERR)
	# ---------------------------------------------
	# `abs_top_srcdir' is needed so that `./configure' finds install-sh.
	# Using --srcdir is more expensive.
	m4_define([AT_CHECK_CONFIGURE],
	[AT_CAPTURE_FILE([config.log])[]dnl
	AT_CHECK([./configure $configure_options $1],
	[$2],
	m4_default([$3], [ignore]), [$4])])


	# AT_CHECK_ENV
	# ------------
	# Check that the full configure run remained in its variable name space,
	# and cleaned up tmp files.
	#
	# Perhaps grep -E is not supported, or perhaps it chokes on such a big regex.
	# In this case just don't pay attention to the env. It would be great
	# to keep the error message but we can't: that would break AT_CHECK.
	#
	# FreeBSD sh may intermingle the trace output from the egrep and grep
	# commands in the pipe, so turn off tracing for these.
	#
	# Some tests might exit prematurely when they find a problem, in
	# which case `env-after' is probably missing. Don't check it then.
	#
	# Here are the variables `configure' may modify during execution:
	# - ^as_
	# M4sh's shell name space.
	# - ^ac_
	# Autoconf's shell name space.
	# - prefix and exec_prefix
	# are kept undefined (NONE) until AC_OUTPUT which then sets them to
	# `/usr/local' and `${prefix}' for make.
	# - (host\|build\|target)(_(alias\|cpu\|vendor\|os))?
	# Set by AC_CANONICAL_(HOST\|BUILD\|TARGET).
	# - cross_compiling
	# Set by AC_INIT.
	# - interpval
	# Set by AC_SYS_INTERPRETER.
	# - CONFIG_STATUS and DEFS
	# Set by AC_OUTPUT.
	# - AC_SUBST'ed variables
	# (FIXME: Generate a list of these automatically.)
	# - _\|@\|.[*#?$].\|argv\|ARGC\|LINENO\|OLDPWD\|PIPESTATUS\|RANDOM\|SECONDS
	# Some variables some shells use and change.
	# `.[*#?$].' catches `$#' etc. which are displayed like this:
	# \| '!'=18186
	# \| '#'=0
	# \| '$'=6908
	#
	m4_define([AT_CHECK_ENV],
	[m4_divert_once([PREPARE_TESTS], [_AT_CHECK_ENV])dnl
	AT_CHECK([at_check_env])])
	m4_define([_AT_CHECK_ENV],
	[AS_FUNCTION_DESCRIBE([at_check_env], [],
	[Compare the directory and environment state both before and after a run,
	and return non-zero status if they differ inappropriately.])
	at_check_env ()
	{
	# Compare directory listings.
	test -f state-ls.before \|\|
	AS_ERROR([state-ls.before not present])
	test -f state-ls.after \
	&& { $at_diff state-ls.before state-ls.after \|\| return 1; }
	# Compare variable space dumps.
	if test -f state-env.before && test -f state-env.after; then
	set +x
	grep_failed=false
	for act_file in state-env.before state-env.after
	do
	($EGREP -v '^(m4_join([\|],
	[a[cs]_.*],
	[(exec_)?prefix\|DEFS\|CONFIG_STATUS],
	[CC\|CFLAGS\|CPP\|GCC\|CXX\|CXXFLAGS\|CXXCPP\|GXX\|F77\|FFLAGS\|FLIBS\|G77],
	[ERL\|ERLC\|ERLCFLAGS\|ERLANG_PATH_ERL\|ERLANG_ROOT_DIR\|ERLANG_LIB_DIR],
	[ERLANG_LIB_DIR_.\|ERLANG_LIB_VER_.\|ERLANG_INSTALL_LIB_DIR],
	[ERLANG_INSTALL_LIB_DIR_.*\|ERLANG_ERTS_VER\|OBJC\|OBJCPP\|OBJCFLAGS],
	[OBJCXX\|OBJCXXCPP\|OBJCXXFLAGS],
	[GOC\|GOFLAGS],
	[OPENMP_CFLAGS],
	[LIBS\|LIB@&t@OBJS\|LTLIBOBJS\|LDFLAGS],
	[INSTALL(_(DATA\|PROGRAM\|SCRIPT))?],
	[CYGWIN\|ISC\|MINGW32\|MINIX\|EMXOS2\|XENIX\|EXEEXT\|OBJEXT],
	[X_(CFLAGS\|(EXTRA_\|PRE_)?LIBS)\|x_(includes\|libraries)\|(have\|no)_x],
	[(host\|build\|target)(_(alias\|cpu\|vendor\|os))?],
	[cross_compiling\|U],
	[interpval\|PATH_SEPARATOR],
	[GFC\|F77_DUMMY_MAIN\|f77_(case\|underscore)],
	[FC(_DUMMY_MAIN\|FLAGS\|LIBS\|FLAGS_[fF]\|_MODEXT\|_MODINC\|_MODOUT\|_DEFINE)?],
	[ALLOCA\|GETLOADAVG_LIBS\|KMEM_GROUP\|NEED_SETGID\|POW_LIB],
	[AWK\|LEX\|LEXLIB\|LEX_OUTPUT_ROOT\|LN_S\|M4\|MKDIR_P\|RANLIB\|SET_MAKE\|YACC],
	[GREP\|[EF]GREP\|SED],
	[[_@]\|.[*#?$].],
	[argv\|ARGC\|LINENO\|OLDPWD\|PIPESTATUS\|RANDOM\|SECONDS]))=' \
	$act_file \|\|
	test $? -eq 1 \|\| echo failed >&2
	) 2>stderr-$act_file \|
	# There may be variables spread on several lines; remove latter lines.
	$GREP '^m4_defn([m4_re_word])=' >clean-$act_file \|\|
	test $? -eq 1 \|\| grep_failed=:
	test -s stderr-$act_file && grep_failed=:
	done
	$at_traceon
	$grep_failed \|\| $at_diff clean-state-env.before clean-state-env.after
	fi
	} [#]at_check_env])


	# AT_CONFIG_CMP(VAR-FILE-A, VAR-FILE-B)
	# -------------------------------------
	# Check the outcomes of two configure runs for equality by comparing dumps of
	# their shell variables. VAR-FILE-A and VAR-FILE-B are two `set'-style shell
	# variable space dumps.
	#
	# We permit variance between runs in the following shell variables:
	# - ^as_
	# M4sh's shell name space.
	# - ^ac_, excluding ^ac_cv_
	# Autoconf's private shell name space.
	# - PPID [bash, zsh]
	# - RANDOM [zsh]
	# - SECONDS [zsh]
	# - '$' [zsh]
	# - argv [zsh]
	# - ARGC [zsh]
	#
	# Furthermore, it is okay for a non-cache variable initialized to empty in one
	# run to be unset in another run. This happens when, for example, cache update
	# code tries a number of values in LIBS and eventually restores LIBS to its
	# original value. If LIBS was previously unset, it will have become set and
	# empty. (OTOH, cache variables indicate the result of the test even if they
	# are empty, so we have to be strict about them.)
	#
	# Lines that do not look like `foo=bar' are probably latter lines of
	# multiline values; trim them.
	#
	m4_define([AT_CONFIG_CMP],
	[for act_file in $1 $2
	do
	$SED '/^ac_cv_/ b
	/^m4_defn([m4_re_word])=./ !d
	/^[[^=]]*='\'''\''$/ d
	/^a[[cs]]_/ d
	/^OLDPWD=/ d
	/^PPID=/ d
	/^RANDOM=/ d
	/^SECONDS=/ d
	/'\'\\\$\''=/ d
	/^argv=/ d
	/^ARGC=/ d
	' $act_file >at_config_vars-$act_file
	done
	AT_CMP([at_config_vars-$1], [at_config_vars-$2])[]dnl
	])# AT_CONFIG_CMP


	# AT_CHECK_DEFINES(CONTENT)
	# -------------------------
	# Verify that config.h, once stripped, is CONTENT.
	# Stripping consists of keeping CPP lines (i.e. containing a hash),
	# but those of automatically checked features (STDC_HEADERS etc.)
	# and symbols (PACKAGE_...).
	# AT_CHECK_HEADER is a better name, but too close from AC_CHECK_HEADER.
	m4_define([AT_CHECK_DEFINES],
	[AT_CHECK([[sed '/#/!d
	/INTTYPES/d
	/MEMORY/d
	/PACKAGE_/d
	/STDC_HEADERS/d
	/STDINT/d
	/STDLIB/d
	/STRING/d
	/SYS_STAT/d
	/SYS_TYPES/d
	/UNISTD/d' config.h]],,
	[$1])])


	# AT_CHECK_AUTOUPDATE
	# -------------------
	m4_define([AT_CHECK_AUTOUPDATE],
	[AT_CHECK([autoupdate $1], [$2], [$3], [$4])
	])


	# _AT_CHECK_AC_MACRO(AC-BODY, PRE-TESTS)
	# --------------------------------------
	# Create a minimalist configure.ac running the macro named
	# NAME-OF-THE-MACRO, check that autoconf runs on that script,
	# and that the shell runs correctly the configure.
	m4_define([_AT_CHECK_AC_MACRO],
	[AT_CONFIGURE_AC([$1])
	$2
	AT_CHECK_AUTOCONF
	AT_CHECK_AUTOHEADER
	AT_CHECK_CONFIGURE
	AT_CHECK_ENV
	])# _AT_CHECK_AC_MACRO


	# AT_CHECK_MACRO(MACRO, [MACRO-USE], [ADDITIONAL-CMDS],
	# [AUTOCONF-FLAGS = -W obsolete])
	# -----------------------------------------------------
	# Create a minimalist configure.ac running the macro named
	# NAME-OF-THE-MACRO, check that autoconf runs on that script,
	# and that the shell runs correctly the configure.
	#
	# We run `configure' twice, both times with a cache, and compare
	# the environment after each run to detect inconsistencies.
	#
	# New macros are not expected to depend upon obsolete macros.
	m4_define([AT_CHECK_MACRO],
	[AT_SETUP([$1])

	AT_CONFIGURE_AC([m4_default([$2], [$1])])

	AT_CHECK_AUTOCONF([m4_default([$4], [-W obsolete])])
	AT_CHECK_AUTOHEADER

	for at_run in r1 r2
	do
	AT_CHECK_CONFIGURE([-C])
	cp -f state-env.after state-env.$at_run
	cp -f config.h config-h.$at_run
	AT_CHECK_ENV
	done

	AT_CMP([config-h.r1], [config-h.r2])
	AT_CONFIG_CMP([state-env.r1], [state-env.r2])

	$3

	AT_CLEANUP[]dnl
	])# AT_CHECK_MACRO


	# AT_CHECK_MACRO_CROSS(MACRO, [MACRO-USE], [ADDITIONAL-CMDS],
	# [AUTOCONF-FLAGS = -W obsolete])
	# -----------------------------------------------------------
	# Like the previous one, but creates two checks: for native
	# compile and for cross-compile.
	m4_define([AT_CHECK_MACRO_CROSS],
	[AT_CHECK_MACRO($@)
	AT_CHECK_MACRO([$1 (cross compile)],
	[AT_KEYWORDS([cross])
	# Exercise the code used when cross-compiling.
	cross_compiling=yes
	ac_tool_warned=yes
	m4_default([$2], [$1])],
	[$3], [$4])
	])


	# AT_CHECK_AU_MACRO(MACRO)
	# ------------------------
	# Create a minimalist configure.ac running the macro named
	# NAME-OF-THE-MACRO, autoupdate this script, check that autoconf runs
	# on that script, and that the shell runs correctly the configure.
	#
	# Updated configure.ac shall not depend upon obsolete macros, which votes
	# in favor of `-W obsolete', but since many of these macros leave a message
	# to be removed by the user once her code is adjusted, let's not check.
	#
	# Remove config.hin to avoid `autoheader: config.hin is unchanged'.
	m4_define([AT_CHECK_AU_MACRO],
	[AT_SETUP([$1])
	AT_KEYWORDS([autoupdate])

	AT_CONFIGURE_AC([$1])

	AT_CHECK_AUTOCONF
	AT_CHECK_AUTOHEADER
	AT_CHECK_CONFIGURE
	AT_CHECK_ENV

	rm config.hin
	AT_CHECK_AUTOUPDATE([], 0, [], ignore)
	AT_CHECK([grep '^$1$' configure.ac], 1)

	AT_CHECK_AUTOCONF
	AT_CHECK_AUTOHEADER
	AT_CHECK_CONFIGURE
	AT_CHECK_ENV

	AT_CLEANUP[]dnl
	])# AT_CHECK_AU_MACRO



	## ----------------------- ##
	## Launch the test suite. ##
	## ----------------------- ##

	AT_INIT