107 lines
2.5 KiB
Perl
107 lines
2.5 KiB
Perl
# -*-perl-*- hey - emacs - this is a perl file
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# src/tools/msvc/pgflex.pl
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use strict;
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use warnings;
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use File::Basename;
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# silence flex bleatings about file path style
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$ENV{CYGWIN} = 'nodosfilewarning';
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# assume we are in the postgres source root
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do './src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
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my ($flexver) = `flex -V`; # grab first line
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$flexver = (split(/\s+/, $flexver))[1];
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$flexver =~ s/[^0-9.]//g;
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my @verparts = split(/\./, $flexver);
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unless ($verparts[0] == 2
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&& ($verparts[1] > 5 || ($verparts[1] == 5 && $verparts[2] >= 31)))
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{
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print "WARNING! Flex install not found, or unsupported Flex version.\n";
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print "echo Attempting to build without.\n";
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exit 0;
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}
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my $input = shift;
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if ($input !~ /\.l$/)
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{
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print "Input must be a .l file\n";
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exit 1;
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}
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elsif (!-e $input)
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{
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print "Input file $input not found\n";
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exit 1;
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}
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(my $output = $input) =~ s/\.l$/.c/;
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# get flex flags from make file
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my $makefile = dirname($input) . "/Makefile";
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my ($mf, $make);
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open($mf, '<', $makefile);
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local $/ = undef;
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$make = <$mf>;
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close($mf);
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my $basetarg = basename($output);
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my $flexflags = ($make =~ /^$basetarg:\s*FLEXFLAGS\s*=\s*(\S.*)/m ? $1 : '');
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system("flex $flexflags -o$output $input");
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if ($? == 0)
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{
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# Check for "%option reentrant" in .l file.
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my $lfile;
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open($lfile, '<', $input) || die "opening $input for reading: $!";
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my $lcode = <$lfile>;
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close($lfile);
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if ($lcode =~ /\%option\sreentrant/)
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{
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# Reentrant scanners usually need a fix to prevent
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# "unused variable" warnings with older flex versions.
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system("perl src\\tools\\fix-old-flex-code.pl $output");
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}
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else
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{
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# For non-reentrant scanners we need to fix up the yywrap
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# macro definition to keep the MS compiler happy.
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# For reentrant scanners (like the core scanner) we do not
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# need to (and must not) change the yywrap definition.
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my $cfile;
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open($cfile, '<', $output) || die "opening $output for reading: $!";
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my $ccode = <$cfile>;
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close($cfile);
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$ccode =~ s/yywrap\(n\)/yywrap()/;
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open($cfile, '>', $output) || die "opening $output for writing: $!";
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print $cfile $ccode;
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close($cfile);
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}
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if ($flexflags =~ /\s-b\s/)
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{
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my $lexback = "lex.backup";
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open($lfile, '<', $lexback) || die "opening $lexback for reading: $!";
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my $lexbacklines = <$lfile>;
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close($lfile);
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my $linecount = $lexbacklines =~ tr /\n/\n/;
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if ($linecount != 1)
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{
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print "Scanner requires backup, see lex.backup.\n";
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exit 1;
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}
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unlink $lexback;
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}
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exit 0;
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}
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else
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{
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exit $? >> 8;
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}
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