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
$tablines .= make_type_tab($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;