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Edit File : autoscan \| Size : 16.72 KB
#! /usr/bin/perl -w # -- perl -- # Generated from autoscan.in; do not edit by hand. # autoscan - Create configure.scan (a preliminary configure.ac) for a package. # Copyright (C) 1994, 1999-2012 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/>. # Written by David MacKenzie <djm@gnu.ai.mit.edu>. eval 'case $# in 0) exec /usr/bin/perl -S "$0";; ) exec /usr/bin/perl -S "$0" "$@";; esac' if 0; BEGIN { my $pkgdatadir = $ENV{'autom4te_perllibdir'} \|\| '/usr/share/autoconf'; unshift @INC, $pkgdatadir; # Override SHELL. On DJGPP SHELL may not be set to a shell # that can handle redirection and quote arguments correctly, # e.g.: COMMAND.COM. For DJGPP always use the shell that configure # has detected. $ENV{'SHELL'} = '/bin/sh' if ($^O eq 'dos'); } use Autom4te::ChannelDefs; use Autom4te::Configure_ac; use Autom4te::General; use Autom4te::FileUtils; use Autom4te::XFile; use File::Basename; use File::Find; use strict; use vars qw(@cfiles @makefiles @shfiles @subdirs %printed); # The kind of the words we are looking for. my @kinds = qw (function header identifier program makevar librarie); # For each kind, the default macro. my %generic_macro = ( 'function' => 'AC_CHECK_FUNCS', 'header' => 'AC_CHECK_HEADERS', 'identifier' => 'AC_CHECK_TYPES', 'program' => 'AC_CHECK_PROGS', 'library' => 'AC_CHECK_LIB' ); my %kind_comment = ( 'function' => 'Checks for library functions.', 'header' => 'Checks for header files.', 'identifier' => 'Checks for typedefs, structures, and compiler characteristics.', 'program' => 'Checks for programs.', ); # $USED{KIND}{ITEM} is the list of locations where the ITEM (of KIND) was used # in the user package. # For instance $USED{function}{alloca} is the list of `file:line' where # `alloca (...)' appears. my %used = (); # $MACRO{KIND}{ITEM} is the list of macros to use to test ITEM. # Initialized from lib/autoscan/. E.g., $MACRO{function}{alloca} contains # the singleton AC_FUNC_ALLOCA. Some require several checks. my %macro = (); # $NEEDED_MACROS{MACRO} is an array of locations requiring MACRO. # E.g., $NEEDED_MACROS{AC_FUNC_ALLOC} the list of `file:line' containing # `alloca (...)'. my %needed_macros = ( 'AC_PREREQ' => [$me], ); my $configure_scan = 'configure.scan'; my $log; # Autoconf and lib files. my $autom4te = $ENV{'AUTOM4TE'} \|\| '/usr/bin/autom4te'; my $autoconf = "$autom4te --language=autoconf"; my @prepend_include; my @include = ('/usr/share/autoconf'); # $help # ----- $help = "Usage: $0 [OPTION]... [SRCDIR] Examine source files in the directory tree rooted at SRCDIR, or the current directory if none is given. Search the source files for common portability problems, check for incompleteness of `configure.ac', and create a file `$configure_scan' which is a preliminary `configure.ac' for that package. -h, --help print this help, then exit -V, --version print version number, then exit -v, --verbose verbosely report processing -d, --debug don't remove temporary files Library directories: -B, --prepend-include=DIR prepend directory DIR to search path -I, --include=DIR append directory DIR to search path Report bugs to <bug-autoconf\@gnu.org>. GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>. General help using GNU software: <http://www.gnu.org/gethelp/>. "; # $version # -------- $version = "autoscan (GNU Autoconf) 2.69 Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+/Autoconf: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by David J. MacKenzie and Akim Demaille. "; ## ------------------------ ## ## Command line interface. ## ## ------------------------ ## # parse_args () # ------------- # Process any command line arguments. sub parse_args () { getopt ('I\|include=s' => \@include, 'B\|prepend-include=s' => \@prepend_include); die "$me: too many arguments Try `$me --help' for more information.\n" if @ARGV > 1; my $srcdir = $ARGV[0] \|\| "."; verb "srcdir = $srcdir"; chdir $srcdir \|\| error "cannot cd to $srcdir: $!"; } # init_tables () # -------------- # Put values in the tables of what to do with each token. sub init_tables () { # The data file format supports only one line of macros per function. # If more than that is required for a common portability problem, # a new Autoconf macro should probably be written for that case, # instead of duplicating the code in lots of configure.ac files. my $file = find_file ("autoscan/autoscan.list", reverse (@prepend_include), @include); my $table = new Autom4te::XFile "< " . open_quote ($file); my $tables_are_consistent = 1; while ($_ = $table->getline) { # Ignore blank lines and comments. next if /^\s$/ \|\| /^\s\#/; # '<kind>: <word> <macro invocation>' or... # '<kind>: <word> warn: <message>'. if (/^(\S+):\s+(\S+)\s+(\S.)$/) { my ($kind, $word, $macro) = ($1, $2, $3); error "$file:$.: invalid kind: $_" unless grep { $_ eq $kind } @kinds; push @{$macro{$kind}{$word}}, $macro; } else { error "$file:$.: invalid definition: $_"; } } if ($debug) { foreach my $kind (@kinds) { foreach my $word (sort keys %{$macro{$kind}}) { print "$kind: $word: @{$macro{$kind}{$word}}\n"; } } } } # used ($KIND, $WORD, [$WHERE]) # ----------------------------- # $WORD is used as a $KIND. sub used ($$;$) { my ($kind, $word, $where) = @_; $where \|\|= "$File::Find::name:$."; if ( # Check for all the libraries. But `-links' is certainly a # `find' argument, and `-le', a `test' argument. ($kind eq 'library' && $word !~ /^(e\|inks)$/) # Other than libraries are to be checked only if listed in # the Autoscan library files. \|\| defined $macro{$kind}{$word} ) { push (@{$used{$kind}{$word}}, $where); } } ## ----------------------- ## ## Scanning source files. ## ## ----------------------- ## # scan_c_file ($FILE-NAME) # ------------------------ sub scan_c_file ($) { my ($file_name) = @_; push @cfiles, $File::Find::name; # Nonzero if in a multiline comment. my $in_comment = 0; my $file = new Autom4te::XFile "< " . open_quote ($file_name); while ($_ = $file->getline) { # Strip out comments. if ($in_comment && s,^.?\/,,) { $in_comment = 0; } # The whole line is inside a comment. next if $in_comment; # All on one line. s,/\.?\/,,g; # Starting on this line. if (s,/\.$,,) { $in_comment = 1; } # Preprocessor directives. if (s/^\s\#\s//) { if (/^include\s<([^>])>/) { used ('header', $1); } if (s/^(if\|ifdef\|ifndef\|elif)\s+//) { foreach my $word (split (/\W+/)) { used ('identifier', $word) unless $word eq 'defined' \|\| $word !~ /^[a-zA-Z_]/; } } # Ignore other preprocessor directives. next; } # Remove string and character constants. s,\"[^\"]\",,g; s,\'[^\']\',,g; # Tokens in the code. # Maybe we should ignore function definitions (in column 0)? while (s/\b([a-zA-Z_]\w)\s\(/ /) { used ('function', $1); } while (s/\b([a-zA-Z_]\w)\b/ /) { used ('identifier', $1); } } $file->close; } # scan_makefile($MAKEFILE-NAME) # ----------------------------- sub scan_makefile ($) { my ($file_name) = @_; push @makefiles, $File::Find::name; my $file = new Autom4te::XFile "< " . open_quote ($file_name); while ($_ = $file->getline) { # Strip out comments. s/#.//; # Variable assignments. while (s/\b([a-zA-Z_]\w)\s=/ /) { used ('makevar', $1); } # Be sure to catch a whole word. For instance `lex$U.$(OBJEXT)' # is a single token. Otherwise we might believe `lex' is needed. foreach my $word (split (/\s+/)) { # Libraries. if ($word =~ /^-l([a-zA-Z_]\w)$/) { used ('library', $1); } # Tokens in the code. # We allow some additional characters, e.g., `+', since # autoscan/programs includes `c++'. if ($word =~ /^[a-zA-Z_][\w+]$/) { used ('program', $word); } } } $file->close; } # scan_sh_file($SHELL-SCRIPT-NAME) # -------------------------------- sub scan_sh_file ($) { my ($file_name) = @_; push @shfiles, $File::Find::name; my $file = new Autom4te::XFile "< " . open_quote ($file_name); while ($_ = $file->getline) { # Strip out comments and variable references. s/#.//; s/\$\{[^\}]}//g; s/@[^@]@//g; # Tokens in the code. while (s/\b([a-zA-Z_]\w)\b/ /) { used ('program', $1); } } $file->close; } # scan_file () # ------------ # Called by &find on each file. $_ contains the current file name with # the current directory of the walk through. sub scan_file () { # Wanted only if there is no corresponding FILE.in. return if -f "$_.in"; # Save $_ as Find::File requires it to be preserved. local $_ = $_; # Strip a useless leading `./'. $File::Find::name =~ s,^\./,,; if ($_ ne '.' and -d $_ and -f "$_/configure.in" \|\| -f "$_/configure.ac" \|\| -f "$_/configure.gnu" \|\| -f "$_/configure") { $File::Find::prune = 1; push @subdirs, $File::Find::name; } if (/\.[chlym](\.in)?$/) { used 'program', 'cc', $File::Find::name; scan_c_file ($_); } elsif (/\.(cc\|cpp\|cxx\|CC\|C\|hh\|hpp\|hxx\|HH\|H\|yy\|ypp\|ll\|lpp)(\.in)?$/) { used 'program', 'c++', $File::Find::name; scan_c_file ($_); } elsif ((/^((?:GNUm\|M\|m)akefile)(\.in)?$/ && ! -f "$1.am") \|\| /^(?:GNUm\|M\|m)akefile(\.am)?$/) { scan_makefile ($_); } elsif (/\.sh(\.in)?$/) { scan_sh_file ($_); } } # scan_files () # ------------- # Read through the files and collect lists of tokens in them # that might create nonportabilities. sub scan_files () { find (\&scan_file, '.'); if ($verbose) { print "cfiles: @cfiles\n"; print "makefiles: @makefiles\n"; print "shfiles: @shfiles\n"; foreach my $kind (@kinds) { print "\n$kind:\n"; foreach my $word (sort keys %{$used{$kind}}) { print "$word: @{$used{$kind}{$word}}\n"; } } } } ## ----------------------- ## ## Output configure.scan. ## ## ----------------------- ## # output_kind ($FILE, $KIND) # -------------------------- sub output_kind ($$) { my ($file, $kind) = @_; # Lists of words to be checked with the generic macro. my @have; print $file "\n# $kind_comment{$kind}\n" if exists $kind_comment{$kind}; foreach my $word (sort keys %{$used{$kind}}) { # Output the needed macro invocations in $configure_scan if not # already printed, and remember these macros are needed. foreach my $macro (@{$macro{$kind}{$word}}) { if ($macro =~ /^warn:\s+(.)/) { my $message = $1; foreach my $location (@{$used{$kind}{$word}}) { warn "$location: warning: $message\n"; } } elsif (exists $generic_macro{$kind} && $macro eq $generic_macro{$kind}) { push (@have, $word); push (@{$needed_macros{"$generic_macro{$kind}([$word])"}}, @{$used{$kind}{$word}}); } else { if (! $printed{$macro}) { print $file "$macro\n"; $printed{$macro} = 1; } push (@{$needed_macros{$macro}}, @{$used{$kind}{$word}}); } } } print $file "$generic_macro{$kind}([" . join(' ', sort(@have)) . "])\n" if @have; } # output_libraries ($FILE) # ------------------------ sub output_libraries ($) { my ($file) = @_; print $file "\n# Checks for libraries.\n"; foreach my $word (sort keys %{$used{'library'}}) { print $file "# FIXME: Replace `main' with a function in `-l$word':\n"; print $file "AC_CHECK_LIB([$word], [main])\n"; } } # output ($CONFIGURE_SCAN) # ------------------------ # Print a proto configure.ac. sub output ($) { my $configure_scan = shift; my %unique_makefiles; my $file = new Autom4te::XFile "> " . open_quote ($configure_scan); print $file ("# -- Autoconf --\n" . "# Process this file with autoconf to produce a configure script.\n" . "\n" . "AC_PREREQ([2.69])\n" . "AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS])\n"); if (defined $cfiles[0]) { print $file "AC_CONFIG_SRCDIR([$cfiles[0]])\n"; print $file "AC_CONFIG_HEADERS([config.h])\n"; } output_kind ($file, 'program'); output_kind ($file, 'makevar'); output_libraries ($file); output_kind ($file, 'header'); output_kind ($file, 'identifier'); output_kind ($file, 'function'); print $file "\n"; if (@makefiles) { # Change DIR/Makefile.in to DIR/Makefile. foreach my $m (@makefiles) { $m =~ s/\.(?:in\|am)$//; $unique_makefiles{$m}++; } print $file ("AC_CONFIG_FILES([", join ("\n ", sort keys %unique_makefiles), "])\n"); } if (@subdirs) { print $file ("AC_CONFIG_SUBDIRS([", join ("\n ", sort @subdirs), "])\n"); } print $file "AC_OUTPUT\n"; $file->close; } ## --------------------------------------- ## ## Checking the accuracy of configure.ac. ## ## --------------------------------------- ## # &check_configure_ac ($CONFIGURE_AC) # ----------------------------------- # Use autoconf to check if all the suggested macros are included # in CONFIGURE_AC. sub check_configure_ac ($) { my ($configure_ac) = @_; # Find what needed macros are invoked in CONFIGURE_AC. # I'd be very happy if someone could explain to me why sort (uniq ...) # doesn't work properly: I need `uniq (sort ...)'. --akim my $trace_option = join (' --trace=', '', uniq (sort (map { s/\(.//; $_ } keys %needed_macros))); verb "running: $autoconf $trace_option $configure_ac"; my $traces = new Autom4te::XFile "$autoconf $trace_option $configure_ac \|"; while ($_ = $traces->getline) { chomp; my ($file, $line, $macro, @args) = split (/:/, $_); if ($macro =~ /^AC_CHECK_(HEADER\|FUNC\|TYPE\|MEMBER)S$/) { # To be rigorous, we should distinguish between space and comma # separated macros. But there is no point. foreach my $word (split (/\s\|,/, $args[0])) { # AC_CHECK_MEMBERS wants `struct' or `union'. if ($macro eq "AC_CHECK_MEMBERS" && $word =~ /^stat.st_/) { $word = "struct " . $word; } delete $needed_macros{"$macro([$word])"}; } } else { delete $needed_macros{$macro}; } } $traces->close; # Report the missing macros. foreach my $macro (sort keys %needed_macros) { warn ("$configure_ac: warning: missing $macro wanted by: " . (${$needed_macros{$macro}}[0]) . "\n"); print $log "$me: warning: missing $macro wanted by: \n"; foreach my $need (@{$needed_macros{$macro}}) { print $log "\t$need\n"; } } } ## -------------- ## ## Main program. ## ## -------------- ## parse_args; $log = new Autom4te::XFile "> " . open_quote ("$me.log"); $autoconf .= " --debug" if $debug; $autoconf .= " --verbose" if $verbose; $autoconf .= join (' --include=', '', map { shell_quote ($_) } @include); $autoconf .= join (' --prepend-include=', '', map { shell_quote ($_) } @prepend_include); my $configure_ac = find_configure_ac; init_tables; scan_files; output ('configure.scan'); if (-f $configure_ac) { check_configure_ac ($configure_ac); } # This close is really needed. For some reason, probably best named # a bug, it seems that the dtor of $LOG is not called automatically # at END. It results in a truncated file. $log->close; exit 0; ### Setup "GNU" style for perl-mode and cperl-mode. ## Local Variables: ## perl-indent-level: 2 ## perl-continued-statement-offset: 2 ## perl-continued-brace-offset: 0 ## perl-brace-offset: 0 ## perl-brace-imaginary-offset: 0 ## perl-label-offset: -2 ## cperl-indent-level: 2 ## cperl-brace-offset: 0 ## cperl-continued-brace-offset: 0 ## cperl-label-offset: -2 ## cperl-extra-newline-before-brace: t ## cperl-merge-trailing-else: nil ## cperl-continued-statement-offset: 2 ## End: Back

Edit File : autoscan | Size : 16.72 KB

#! /usr/bin/perl -w
# -*- perl -*-
# Generated from autoscan.in; do not edit by hand.

# autoscan - Create configure.scan (a preliminary configure.ac) for a package.
# Copyright (C) 1994, 1999-2012 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/>.

# Written by David MacKenzie <djm@gnu.ai.mit.edu>.

eval 'case $# in 0) exec /usr/bin/perl -S "$0";; *) exec /usr/bin/perl -S "$0" "$@";; esac'
    if 0;

BEGIN
{
  my $pkgdatadir = $ENV{'autom4te_perllibdir'} || '/usr/share/autoconf';
  unshift @INC, $pkgdatadir;

# Override SHELL.  On DJGPP SHELL may not be set to a shell
  # that can handle redirection and quote arguments correctly,
  # e.g.: COMMAND.COM.  For DJGPP always use the shell that configure
  # has detected.
  $ENV{'SHELL'} = '/bin/sh' if ($^O eq 'dos');
}

use Autom4te::ChannelDefs;
use Autom4te::Configure_ac;
use Autom4te::General;
use Autom4te::FileUtils;
use Autom4te::XFile;
use File::Basename;
use File::Find;
use strict;

use vars qw(@cfiles @makefiles @shfiles @subdirs %printed);

# The kind of the words we are looking for.
my @kinds = qw (function header identifier program
		makevar librarie);

# For each kind, the default macro.
my %generic_macro =
  (
   'function'   => 'AC_CHECK_FUNCS',
   'header'     => 'AC_CHECK_HEADERS',
   'identifier' => 'AC_CHECK_TYPES',
   'program'    => 'AC_CHECK_PROGS',
   'library'    => 'AC_CHECK_LIB'
  );

my %kind_comment =
  (
   'function'   => 'Checks for library functions.',
   'header'     => 'Checks for header files.',
   'identifier' => 'Checks for typedefs, structures, and compiler characteristics.',
   'program'    => 'Checks for programs.',
  );

# $USED{KIND}{ITEM} is the list of locations where the ITEM (of KIND) was used
# in the user package.
# For instance $USED{function}{alloca} is the list of `file:line' where
# `alloca (...)' appears.
my %used = ();

# $MACRO{KIND}{ITEM} is the list of macros to use to test ITEM.
# Initialized from lib/autoscan/*.  E.g., $MACRO{function}{alloca} contains
# the singleton AC_FUNC_ALLOCA.  Some require several checks.
my %macro = ();

# $NEEDED_MACROS{MACRO} is an array of locations requiring MACRO.
# E.g., $NEEDED_MACROS{AC_FUNC_ALLOC} the list of `file:line' containing
# `alloca (...)'.
my %needed_macros =
  (
   'AC_PREREQ' => [$me],
  );

my $configure_scan = 'configure.scan';
my $log;

# Autoconf and lib files.
my $autom4te = $ENV{'AUTOM4TE'} || '/usr/bin/autom4te';
my $autoconf = "$autom4te --language=autoconf";
my @prepend_include;
my @include = ('/usr/share/autoconf');

# $help
# -----
$help = "Usage: $0 [OPTION]... [SRCDIR]

Examine source files in the directory tree rooted at SRCDIR, or the
current directory if none is given.  Search the source files for
common portability problems, check for incompleteness of
`configure.ac', and create a file `$configure_scan' which is a
preliminary `configure.ac' for that package.

-h, --help          print this help, then exit
  -V, --version       print version number, then exit
  -v, --verbose       verbosely report processing
  -d, --debug         don't remove temporary files

Library directories:
  -B, --prepend-include=DIR  prepend directory DIR to search path
  -I, --include=DIR          append directory DIR to search path

Report bugs to <bug-autoconf\@gnu.org>.
GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
";

# $version
# --------
$version = "autoscan (GNU Autoconf) 2.69
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David J. MacKenzie and Akim Demaille.
";

## ------------------------ ##
## Command line interface.  ##
## ------------------------ ##

# parse_args ()
# -------------
# Process any command line arguments.
sub parse_args ()
{
  getopt ('I|include=s' => \@include,
	  'B|prepend-include=s' => \@prepend_include);

die "$me: too many arguments
Try `$me --help' for more information.\n"
    if @ARGV > 1;

my $srcdir = $ARGV[0] || ".";

verb "srcdir = $srcdir";
  chdir $srcdir || error "cannot cd to $srcdir: $!";
}

# init_tables ()
# --------------
# Put values in the tables of what to do with each token.
sub init_tables ()
{
  # The data file format supports only one line of macros per function.
  # If more than that is required for a common portability problem,
  # a new Autoconf macro should probably be written for that case,
  # instead of duplicating the code in lots of configure.ac files.
  my $file = find_file ("autoscan/autoscan.list",
			reverse (@prepend_include), @include);
  my $table = new Autom4te::XFile "< " . open_quote ($file);
  my $tables_are_consistent = 1;

while ($_ = $table->getline)
    {
      # Ignore blank lines and comments.
      next
	if /^\s*$/ || /^\s*\#/;

# '<kind>: <word> <macro invocation>' or...
      # '<kind>: <word> warn: <message>'.
      if (/^(\S+):\s+(\S+)\s+(\S.*)$/)
	{
	  my ($kind, $word, $macro) = ($1, $2, $3);
	  error "$file:$.: invalid kind: $_"
	    unless grep { $_ eq $kind } @kinds;
	  push @{$macro{$kind}{$word}}, $macro;
	}
      else
	{
	  error "$file:$.: invalid definition: $_";
	}
    }

if ($debug)
    {
      foreach my $kind (@kinds)
	{
	  foreach my $word (sort keys %{$macro{$kind}})
	    {
	      print "$kind: $word: @{$macro{$kind}{$word}}\n";
	    }
	}

}
}

# used ($KIND, $WORD, [$WHERE])
# -----------------------------
# $WORD is used as a $KIND.
sub used ($$;$)
{
  my ($kind, $word, $where) = @_;
  $where ||= "$File::Find::name:$.";
  if (
      # Check for all the libraries.  But `-links' is certainly a
      # `find' argument, and `-le', a `test' argument.
      ($kind eq 'library' && $word !~ /^(e|inks)$/)
      # Other than libraries are to be checked only if listed in
      # the Autoscan library files.
      || defined $macro{$kind}{$word}
     )
    {
      push (@{$used{$kind}{$word}}, $where);
    }
}

## ----------------------- ##
## Scanning source files.  ##
## ----------------------- ##

# scan_c_file ($FILE-NAME)
# ------------------------
sub scan_c_file ($)
{
  my ($file_name) = @_;
  push @cfiles, $File::Find::name;

# Nonzero if in a multiline comment.
  my $in_comment = 0;

my $file = new Autom4te::XFile "< " . open_quote ($file_name);

while ($_ = $file->getline)
    {
      # Strip out comments.
      if ($in_comment && s,^.*?\*/,,)
	{
	  $in_comment = 0;
	}
      # The whole line is inside a comment.
      next if $in_comment;
      # All on one line.
      s,/\*.*?\*/,,g;

# Starting on this line.
      if (s,/\*.*$,,)
	{
	  $in_comment = 1;
	}

# Preprocessor directives.
      if (s/^\s*\#\s*//)
	{
	  if (/^include\s*<([^>]*)>/)
	    {
	      used ('header', $1);
	    }
	  if (s/^(if|ifdef|ifndef|elif)\s+//)
	    {
	      foreach my $word (split (/\W+/))
		{
		  used ('identifier', $word)
		    unless $word eq 'defined' || $word !~ /^[a-zA-Z_]/;
		}
	    }
	  # Ignore other preprocessor directives.
	  next;
	}

# Remove string and character constants.
      s,\"[^\"]*\",,g;
      s,\'[^\']*\',,g;

# Tokens in the code.
      # Maybe we should ignore function definitions (in column 0)?
      while (s/\b([a-zA-Z_]\w*)\s*\(/ /)
	{
	  used ('function', $1);
	}
      while (s/\b([a-zA-Z_]\w*)\b/ /)
	{
	  used ('identifier', $1);
	}
    }

$file->close;
}

# scan_makefile($MAKEFILE-NAME)
# -----------------------------
sub scan_makefile ($)
{
  my ($file_name) = @_;
  push @makefiles, $File::Find::name;

my $file = new Autom4te::XFile "< " . open_quote ($file_name);

while ($_ = $file->getline)
    {
      # Strip out comments.
      s/#.*//;

# Variable assignments.
      while (s/\b([a-zA-Z_]\w*)\s*=/ /)
	{
	  used ('makevar', $1);
	}
      # Be sure to catch a whole word.  For instance `lex$U.$(OBJEXT)'
      # is a single token.  Otherwise we might believe `lex' is needed.
      foreach my $word (split (/\s+/))
	{
	  # Libraries.
	  if ($word =~ /^-l([a-zA-Z_]\w*)$/)
	    {
	      used ('library', $1);
	    }
	  # Tokens in the code.
	  # We allow some additional characters, e.g., `+', since
	  # autoscan/programs includes `c++'.
	  if ($word =~ /^[a-zA-Z_][\w+]*$/)
	    {
	      used ('program', $word);
	    }
	}
    }

$file->close;
}

# scan_sh_file($SHELL-SCRIPT-NAME)
# --------------------------------
sub scan_sh_file ($)
{
  my ($file_name) = @_;
  push @shfiles, $File::Find::name;

my $file = new Autom4te::XFile "< " . open_quote ($file_name);

while ($_ = $file->getline)
    {
      # Strip out comments and variable references.
      s/#.*//;
      s/\$\{[^\}]*}//g;
      s/@[^@]*@//g;

# Tokens in the code.
      while (s/\b([a-zA-Z_]\w*)\b/ /)
	{
	  used ('program', $1);
	}
    }

$file->close;
}

# scan_file ()
# ------------
# Called by &find on each file.  $_ contains the current file name with
# the current directory of the walk through.
sub scan_file ()
{
  # Wanted only if there is no corresponding FILE.in.
  return
    if -f "$_.in";

# Save $_ as Find::File requires it to be preserved.
  local $_ = $_;

# Strip a useless leading `./'.
  $File::Find::name =~ s,^\./,,;

if ($_ ne '.' and -d $_ and
      -f "$_/configure.in"  ||
      -f "$_/configure.ac"  ||
      -f "$_/configure.gnu" ||
      -f "$_/configure")
    {
      $File::Find::prune = 1;
      push @subdirs, $File::Find::name;
    }
  if (/\.[chlym](\.in)?$/)
    {
      used 'program', 'cc', $File::Find::name;
      scan_c_file ($_);
    }
  elsif (/\.(cc|cpp|cxx|CC|C|hh|hpp|hxx|HH|H|yy|ypp|ll|lpp)(\.in)?$/)
    {
      used 'program', 'c++', $File::Find::name;
      scan_c_file ($_);
    }
  elsif ((/^((?:GNUm|M|m)akefile)(\.in)?$/ && ! -f "$1.am")
	 || /^(?:GNUm|M|m)akefile(\.am)?$/)
    {
      scan_makefile ($_);
    }
  elsif (/\.sh(\.in)?$/)
    {
      scan_sh_file ($_);
    }
}

# scan_files ()
# -------------
# Read through the files and collect lists of tokens in them
# that might create nonportabilities.
sub scan_files ()
{
  find (\&scan_file, '.');

if ($verbose)
    {
      print "cfiles: @cfiles\n";
      print "makefiles: @makefiles\n";
      print "shfiles: @shfiles\n";

foreach my $kind (@kinds)
	{
	  print "\n$kind:\n";
	  foreach my $word (sort keys %{$used{$kind}})
	    {
	      print "$word: @{$used{$kind}{$word}}\n";
	    }
	}
    }
}

## ----------------------- ##
## Output configure.scan.  ##
## ----------------------- ##

# output_kind ($FILE, $KIND)
# --------------------------
sub output_kind ($$)
{
  my ($file, $kind) = @_;
  # Lists of words to be checked with the generic macro.
  my @have;

print $file "\n# $kind_comment{$kind}\n"
    if exists $kind_comment{$kind};
  foreach my $word (sort keys %{$used{$kind}})
    {
      # Output the needed macro invocations in $configure_scan if not
      # already printed, and remember these macros are needed.
      foreach my $macro (@{$macro{$kind}{$word}})
	{
	  if ($macro =~ /^warn:\s+(.*)/)
	    {
	      my $message = $1;
	      foreach my $location (@{$used{$kind}{$word}})
		{
		  warn "$location: warning: $message\n";
		}
	    }
	  elsif (exists $generic_macro{$kind}
	      && $macro eq $generic_macro{$kind})
	    {
	      push (@have, $word);
	      push (@{$needed_macros{"$generic_macro{$kind}([$word])"}},
		    @{$used{$kind}{$word}});
	    }
	  else
	    {
	      if (! $printed{$macro})
		{
		  print $file "$macro\n";
		  $printed{$macro} = 1;
		}
	      push (@{$needed_macros{$macro}},
		    @{$used{$kind}{$word}});
	    }
	}
    }
  print $file "$generic_macro{$kind}([" . join(' ', sort(@have)) . "])\n"
    if @have;
}

# output_libraries ($FILE)
# ------------------------
sub output_libraries ($)
{
  my ($file) = @_;

print $file "\n# Checks for libraries.\n";
  foreach my $word (sort keys %{$used{'library'}})
    {
      print $file "# FIXME: Replace `main' with a function in `-l$word':\n";
      print $file "AC_CHECK_LIB([$word], [main])\n";
    }
}

# output ($CONFIGURE_SCAN)
# ------------------------
# Print a proto configure.ac.
sub output ($)
{
  my $configure_scan = shift;
  my %unique_makefiles;

my $file = new Autom4te::XFile "> " . open_quote ($configure_scan);

print $file
    ("#                                               -*- Autoconf -*-\n" .
     "# Process this file with autoconf to produce a configure script.\n" .
     "\n" .
     "AC_PREREQ([2.69])\n" .
     "AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS])\n");
  if (defined $cfiles[0])
    {
      print $file "AC_CONFIG_SRCDIR([$cfiles[0]])\n";
      print $file "AC_CONFIG_HEADERS([config.h])\n";
    }

output_kind ($file, 'program');
  output_kind ($file, 'makevar');
  output_libraries ($file);
  output_kind ($file, 'header');
  output_kind ($file, 'identifier');
  output_kind ($file, 'function');

print $file "\n";
  if (@makefiles)
    {
      # Change DIR/Makefile.in to DIR/Makefile.
      foreach my $m (@makefiles)
	{
	  $m =~ s/\.(?:in|am)$//;
	  $unique_makefiles{$m}++;
	}
      print $file ("AC_CONFIG_FILES([",
		   join ("\n                 ",
			 sort keys %unique_makefiles), "])\n");
    }
  if (@subdirs)
    {
      print $file ("AC_CONFIG_SUBDIRS([",
		   join ("\n                   ",
			 sort @subdirs), "])\n");
    }
  print $file "AC_OUTPUT\n";

$file->close;
}

## --------------------------------------- ##
## Checking the accuracy of configure.ac.  ##
## --------------------------------------- ##

# &check_configure_ac ($CONFIGURE_AC)
# -----------------------------------
# Use autoconf to check if all the suggested macros are included
# in CONFIGURE_AC.
sub check_configure_ac ($)
{
  my ($configure_ac) = @_;

# Find what needed macros are invoked in CONFIGURE_AC.
  # I'd be very happy if someone could explain to me why sort (uniq ...)
  # doesn't work properly: I need `uniq (sort ...)'.  --akim
  my $trace_option =
    join (' --trace=', '',
	  uniq (sort (map { s/\(.*//; $_ } keys %needed_macros)));

verb "running: $autoconf $trace_option $configure_ac";
  my $traces =
    new Autom4te::XFile "$autoconf $trace_option $configure_ac |";

while ($_ = $traces->getline)
    {
      chomp;
      my ($file, $line, $macro, @args) = split (/:/, $_);
      if ($macro =~ /^AC_CHECK_(HEADER|FUNC|TYPE|MEMBER)S$/)
	{
	  # To be rigorous, we should distinguish between space and comma
	  # separated macros.  But there is no point.
	  foreach my $word (split (/\s|,/, $args[0]))
	    {
	      # AC_CHECK_MEMBERS wants `struct' or `union'.
	      if ($macro eq "AC_CHECK_MEMBERS"
		  && $word =~ /^stat.st_/)
		{
		  $word = "struct " . $word;
		}
	      delete $needed_macros{"$macro([$word])"};
	    }
	}
      else
	{
	  delete $needed_macros{$macro};
	}
    }

$traces->close;

# Report the missing macros.
  foreach my $macro (sort keys %needed_macros)
    {
      warn ("$configure_ac: warning: missing $macro wanted by: "
	    . (${$needed_macros{$macro}}[0])
	    . "\n");
      print $log "$me: warning: missing $macro wanted by: \n";
      foreach my $need (@{$needed_macros{$macro}})
	{
	  print $log "\t$need\n";
	}
    }
}

## -------------- ##
## Main program.  ##
## -------------- ##

parse_args;
$log = new Autom4te::XFile "> " . open_quote ("$me.log");

$autoconf .= " --debug" if $debug;
$autoconf .= " --verbose" if $verbose;
$autoconf .= join (' --include=', '', map { shell_quote ($_) } @include);
$autoconf .= join (' --prepend-include=', '', map { shell_quote ($_) } @prepend_include);

my $configure_ac = find_configure_ac;
init_tables;
scan_files;
output ('configure.scan');
if (-f $configure_ac)
  {
    check_configure_ac ($configure_ac);
  }
# This close is really needed.  For some reason, probably best named
# a bug, it seems that the dtor of $LOG is not called automatically
# at END.  It results in a truncated file.
$log->close;
exit 0;

### Setup "GNU" style for perl-mode and cperl-mode.
## Local Variables:
## perl-indent-level: 2
## perl-continued-statement-offset: 2
## perl-continued-brace-offset: 0
## perl-brace-offset: 0
## perl-brace-imaginary-offset: 0
## perl-label-offset: -2
## cperl-indent-level: 2
## cperl-brace-offset: 0
## cperl-continued-brace-offset: 0
## cperl-label-offset: -2
## cperl-extra-newline-before-brace: t
## cperl-merge-trailing-else: nil
## cperl-continued-statement-offset: 2
## End:

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