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188e64dde7
Using an unset variable hides the true intent and also requires an extra backslash `\$running_under_some_shell` when used in heredoc. Note that this could also lead to mistake when using `\$` in a regular Perl program, as this would be true and not false as it should be. Stop recommending the use of an undefined variable for the shell fallback. Use '0', with a comment making clear the goal of 'if 0'.
60 lines
1.5 KiB
Perl
60 lines
1.5 KiB
Perl
#!/usr/local/bin/perl
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use strict;
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use warnings;
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use Config;
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use File::Basename qw(&basename &dirname);
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use File::Spec;
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use Cwd;
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# List explicitly here the variables you want Configure to
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# generate. Metaconfig only looks for shell variables, so you
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# have to mention them as if they were shell variables, not
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# %Config entries:
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# $startperl
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# $perlpath
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# $eunicefix
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# This forces PL files to create target in same directory as PL file.
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# This is so that make depend always knows where to find PL derivatives.
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my $origdir = cwd;
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chdir dirname($0);
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my $file = basename($0, '.PL');
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$file .= '.com' if $^O eq 'VMS';
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# Open input file before creating output file.
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my $in = File::Spec->catfile(File::Spec->updir, 'lib', 'diagnostics.pm');
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open IN, '<', $in or die "Can't open $in: $!\n";
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# Create output file.
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open OUT, '>', $file or die "Can't create $file: $!";
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print "Extracting $file (with variable substitutions)\n";
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# In this section, perl variables will be expanded during extraction.
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# You can use $Config{...} to use Configure variables.
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print OUT <<"!GROK!THIS!";
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$Config{startperl}
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eval 'exec $Config{perlpath} -S \$0 \${1+"\$@"}'
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if 0; # ^ Run only under a shell
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!GROK!THIS!
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print OUT <<'!NO!SUBS!';
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BEGIN { pop @INC if $INC[-1] eq '.' }
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!NO!SUBS!
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while (<IN>) {
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print OUT unless /^package diagnostics/;
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}
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close IN;
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close OUT or die "Can't close $file: $!";
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chmod 0755, $file or die "Can't reset permissions for $file: $!\n";
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exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':';
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chdir $origdir;
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