#! @PERL@
# autoscan - Create configure.scan (a preliminary configure.in) for a package.
# Copyright (C) 1994 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
# Written by David MacKenzie <djm@gnu.ai.mit.edu>.
require "find.pl";
$datadir = $ENV{"AC_MACRODIR"} || "@datadir@";
$verbose = 0;
# Reference these variables to pacify perl -w.
undef %identifiers_macros;
undef %makevars_macros;
undef %programs_macros;
&parse_args;
&init_tables;
&find('.');
&scan_files;
&output;
exit 0;
# Process any command line arguments.
sub parse_args
{
local ($usage) =
"Usage: autoscan [--macrodir=dir] [--help] [--verbose] [--version] [srcdir]\n";
foreach $_ (@ARGV) {
if (/^--m[a-z]*=(.*)/) {
$datadir = $1;
} elsif (/^--h/) {
print "$usage";
exit 0;
} elsif (/^--verb/) {
$verbose = 1;
} elsif (/^--vers/) {
&version;
} elsif (/^[^-]/) {
die "$usage" if defined($srcdir);
# Top level directory of the package being autoscanned.
$srcdir = $_;
} else {
die "$usage";
}
}
$srcdir="." if !defined($srcdir);
print "srcdir=$srcdir\n" if $verbose;
chdir $srcdir || die "$0: cannot cd to $srcdir: $!\n";
open(CONF, ">configure.scan") ||
die "$0: cannot create configure.scan: $!\n";
}
# Print the version number and exit.
sub version
{
open(ACG, "<$datadir/acgeneral.m4") ||
die "$0: cannot open $datadir/acgeneral.m4: $!\n";
while (<ACG>) {
if (/define.AC_ACVERSION.\s*([0-9.]+)/) {
print "Autoconf version $1\n";
exit 0;
}
}
die "Autoconf version unknown\n";
}
# Put values in the tables of what to do with each token.
sub init_tables
{
local($kind, $word, $macro);
# Initialize a table of C keywords (to ignore).
# Taken from K&R 1st edition p. 180.
# ANSI C, GNU C, and C++ keywords can introduce portability problems,
# so don't ignore them.
foreach $word ('int', 'char', 'float', 'double', 'struct', 'union',
'long', 'short', 'unsigned', 'auto', 'extern', 'register',
'typedef', 'static', 'goto', 'return', 'sizeof', 'break',
'continue', 'if', 'else', 'for', 'do', 'while', 'switch',
'case', 'default') {
$c_keywords{$word} = 0;
}
# 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.in files.
foreach $kind ('functions', 'headers', 'identifiers', 'programs',
'makevars') {
open(TABLE, "<$datadir/ac$kind") ||
die "$0: cannot open $datadir/ac$kind: $!\n";
while (<TABLE>) {
next if /^\s*$/ || /^\s*#/; # Ignore blank lines and comments.
($word, $macro) = split;
eval "\$$kind" . "_macros{\$word} = \$macro";
}
close(TABLE);
}
}
# Collect names of various kinds of files in the package.
# Called by &find on each file.
sub wanted
{
if (/^.*\.[chlymC]$/ || /^.*\.cc$/) {
$name =~ s?^\./??; push(@cfiles, $name);
}
elsif (/^[Mm]akefile$/ || /^[Mm]akefile\.in$/ || /^GNUmakefile$/) {
$name =~ s?^\./??; push(@makefiles, $name);
}
elsif (/^.*\.sh$/) {
$name =~ s?^\./??; push(@shfiles, $name);
}
}
# Read through the files and collect lists of tokens in them
# that might create nonportabilities.
sub scan_files
{
$initfile = $cfiles[0]; # Pick one at random.
if ($verbose) {
print "cfiles:", join(" ", @cfiles), "\n";
print "makefiles:", join(" ", @makefiles), "\n";
print "shfiles:", join(" ", @shfiles), "\n";
}
foreach $file (@cfiles) {
&scan_c_file($file);
}
foreach $file (@makefiles) {
&scan_makefile($file);
}
foreach $file (@shfiles) {
&scan_sh_file($file);
}
}
sub scan_c_file
{
local($file) = @_;
local($in_comment) = 0; # Nonzero if in a multiline comment.
open(CFILE, "<$file") || die "$0: cannot open $file: $!\n";
while (<CFILE>) {
# Strip out comments, approximately.
# Ending on this line.
if ($in_comment && m,\*/,) {
s,.*\*/,,;
$in_comment = 0;
}
# All on one line.
s,/\*.*\*/,,g;
# Starting on this line.
if (m,/\*,) {
$in_comment = 1;
}
# Continuing on this line.
next if $in_comment;
# Preprocessor directives.
if (/^\s*#\s*include\s*<([^>]*)>/) {
$headers{$1}++;
}
# Ignore other preprocessor directives.
next if /^\s*#/;
# Remove string and character constants.
s,\"[^\"]*\",,g;
s,\'[^\']*\',,g;
# Tokens in the code.
# Maybe we should ignore function definitions (in column 0)?
while (s/\W([a-zA-Z_]\w*)\s*\(/ /) {
$functions{$1}++ if !defined($c_keywords{$1});
}
while (s/\W([a-zA-Z_]\w*)\W/ /) {
$identifiers{$1}++ if !defined($c_keywords{$1});
}
}
close(CFILE);
if ($verbose) {
local($word);
print "\n$file functions:\n";
foreach $word (sort keys %functions) {
print "$word $functions{$word}\n";
}
print "\n$file identifiers:\n";
foreach $word (sort keys %identifiers) {
print "$word $identifiers{$word}\n";
}
print "\n$file headers:\n";
foreach $word (sort keys %headers) {
print "$word $headers{$word}\n";
}
}
}
sub scan_makefile
{
local($file) = @_;
open(MFILE, "<$file") || die "$0: cannot open $file: $!\n";
while (<MFILE>) {
# Strip out comments and variable references.
s/#.*//;
s/\$\([^\)]*\)//g;
s/\${[^\}]*}//g;
s/@[^@]*@//g;
# Variable assignments.
while (s/\W([a-zA-Z_]\w*)\s*=/ /) {
$makevars{$1}++;
}
# Libraries.
while (s/\W-l([a-zA-Z_]\w*)\W/ /) {
$libraries{$1}++;
}
# Tokens in the code.
while (s/\W([a-zA-Z_]\w*)\W/ /) {
$programs{$1}++;
}
}
close(MFILE);
if ($verbose) {
local($word);
print "\n$file makevars:\n";
foreach $word (sort keys %makevars) {
print "$word $makevars{$word}\n";
}
print "\n$file libraries:\n";
foreach $word (sort keys %libraries) {
print "$word $libraries{$word}\n";
}
print "\n$file programs:\n";
foreach $word (sort keys %programs) {
print "$word $programs{$word}\n";
}
}
}
sub scan_sh_file
{
local($file) = @_;
open(MFILE, "<$file") || die "$0: cannot open $file: $!\n";
while (<MFILE>) {
# Strip out comments and variable references.
s/#.*//;
s/\${[^\}]*}//g;
s/@[^@]*@//g;
# Tokens in the code.
while (s/\W([a-zA-Z_]\w*)\W/ /) {
$programs{$1}++;
}
}
close(MFILE);
if ($verbose) {
local($word);
print "\n$file programs:\n";
foreach $word (sort keys %programs) {
print "$word $programs{$word}\n";
}
}
}
# Print a configure.in.
sub output
{
local (%unique_makefiles);
print CONF "dnl Process this file with autoconf to produce a configure script.\n";
print CONF "AC_INIT($initfile)\n";
&output_programs;
&output_headers;
&output_identifiers;
&output_functions;
# Change DIR/Makefile.in to DIR/Makefile.
foreach $_ (@makefiles) {
s/\.in$//;
$unique_makefiles{$_}++;
}
print CONF "\nAC_OUTPUT(", join(" ", keys(%unique_makefiles)), ")\n";
close CONF;
}
# Print Autoconf macro $1 if it's not undef and hasn't been printed already.
sub print_unique
{
local($macro) = @_;
if (defined($macro) && !defined($printed{$macro})) {
print CONF "$macro\n";
$printed{$macro} = 1;
}
}
sub output_programs
{
local ($word);
print CONF "\ndnl Checks for programs.\n";
foreach $word (sort keys %programs) {
&print_unique($programs_macros{$word});
}
foreach $word (sort keys %makevars) {
&print_unique($makevars_macros{$word});
}
print CONF "\ndnl Checks for libraries.\n";
foreach $word (sort keys %libraries) {
print CONF "dnl Replace `\main\' with a function in -l$word:\n";
print CONF "AC_CHECK_LIB($word, main)\n";
}
}
sub output_headers
{
local ($word);
print CONF "\ndnl Checks for header files.\n";
foreach $word (sort keys %headers) {
if (defined($headers_macros{$word}) &&
$headers_macros{$word} eq 'AC_CHECK_HEADERS') {
push(@have_headers, $word);
} else {
&print_unique($headers_macros{$word});
}
}
print CONF "AC_CHECK_HEADERS(" . join(' ', sort(@have_headers)) . ")\n"
if defined(@have_headers);
}
sub output_identifiers
{
local ($word);
print CONF "\ndnl Checks for typedefs, structures, and compiler characteristics.\n";
foreach $word (sort keys %identifiers) {
&print_unique($identifiers_macros{$word});
}
}
sub output_functions
{
local ($word);
print CONF "\ndnl Checks for library functions.\n";
foreach $word (sort keys %functions) {
if (defined($functions_macros{$word}) &&
$functions_macros{$word} eq 'AC_CHECK_FUNCS') {
push(@have_funcs, $word);
} else {
&print_unique($functions_macros{$word});
}
}
print CONF "AC_CHECK_FUNCS(" . join(' ', sort(@have_funcs)) . ")\n"
if defined(@have_funcs);
}