autoscan.in

autoconf是一个产生可以自动配置源代码包

#! @PERL@ -w
# -*- perl -*-
# @configure_input@

# autoscan - Create configure.scan (a preliminary configure.ac) for a package.
# Copyright (C) 1994, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
#  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.

# Written by David MacKenzie <[e-mail]>.

eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
    if 0;

BEGIN
{
  my $datadir = $ENV{'autom4te_perllibdir'} || '@datadir@';
  unshift @INC, $datadir;

  # 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.
  $ENV{'SHELL'} = '@SHELL@' if ($^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'} || '@bindir@/@autom4te-name@';
my $autoconf = "$autom4te --language=autoconf";
my @prepend_include;
my @include = ('@datadir@');

# $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>.\n";

# $version
# --------
$version = "autoscan (@PACKAGE_NAME@) @VERSION@
Written by David J. MacKenzie and Akim Demaille.

Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n";




## ------------------------ ##
## 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 $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 $file = new Autom4te::XFile "<$file_name";

  while ($_ = $file->getline)
    {
      # Strip out comments.
      if ($in_comment && s,^.*?\*/,,)
	{
	  $in_comment = 0;
	}
      # The whole line is inside a commment.
      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 $file = new Autom4te::XFile "<$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);
	    }
	}