use warnings;
use strict;
+BEGIN { require 'regen_lib.pl'; }
+
my $bison = 'bison';
if (@ARGV >= 2 and $ARGV[0] eq '-b') {
(my $tab_file = $y_file) =~ s/\.y$/.tab/;
(my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/;
(my $tmph_file = $y_file) =~ s/\.y$/tmp.h/;
+my $new_h_file = "$h_file-new";
+my $new_act_file = "$act_file-new";
+my $new_tab_file = "$tab_file-new";
# the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive
# the test below to allow that version too. DAPM Feb 04.
my $version = `$bison -V`;
+unless ($version) { die <<EOF; }
+Could not find a version of bison in your path. Please install bison.
+EOF
+
unless ($version =~ /\b(1\.875[a-z]?|2\.[0134])\b/) { die <<EOF; }
You have the wrong version of bison in your path; currently 1.875
-2.0, 2.1 or 2.3 is required. Try installing
- http://ftp.gnu.org/gnu/bison/bison-2.1.tar.gz
+2.0, 2.1, 2.3 or 2.4 is required. Try installing
+ http://ftp.gnu.org/gnu/bison/bison-2.4.1.tar.gz
or similar. Your bison identifies itself as:
$version
$tablines .= make_type_tab($y_file, $tablines);
-chmod 0644, $act_file;
-open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n";
+chmod 0644, $new_act_file;
+open ACTFILE, ">$new_act_file" or die "can't open $new_act_file: $!\n";
print ACTFILE $actlines;
close ACTFILE;
-chmod 0444, $act_file;
+chmod 0444, $new_act_file;
-chmod 0644, $tab_file;
-open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n";
+chmod 0644, $new_tab_file;
+open TABFILE, ">$new_tab_file" or die "can't open $new_tab_file: $!\n";
print TABFILE $tablines;
close TABFILE;
-chmod 0444, $tab_file;
+chmod 0444, $new_tab_file;
unlink $tmpc_file;
# C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them.
open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n";
-chmod 0644, $h_file;
-open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n";
+chmod 0644, $new_h_file;
+open H_FILE, ">$new_h_file" or die "Can't open $new_h_file: $!\n";
my $endcore_done = 0;
# Token macros need to be generated manually on bison 2.4
my $gather_tokens = ($version =~ /\b2\.4\b/ ? undef : 0);
}
close TMPH_FILE;
close H_FILE;
-chmod 0444, $h_file;
+chmod 0444, $new_h_file;
unlink $tmph_file;
-print "rebuilt: $h_file $tab_file $act_file\n";
+rename_if_different($new_h_file, $h_file);
+rename_if_different($new_tab_file, $tab_file);
+rename_if_different($new_act_file, $act_file);
exit 0;