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# -*-perl-*- hey - emacs - this is a perl file
# Copyright (c) 2021, PostgreSQL Global Development Group
# src/tools/msvc/pgflex.pl
use strict;
use warnings;
use File::Basename;
# silence flex bleatings about file path style
$ENV{CYGWIN} = 'nodosfilewarning';
# assume we are in the postgres source root
do './src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
my ($flexver) = `flex -V`; # grab first line
$flexver = (split(/\s+/, $flexver))[1];
$flexver =~ s/[^0-9.]//g;
my @verparts = split(/\./, $flexver);
unless ($verparts[0] == 2
&& ($verparts[1] > 5 || ($verparts[1] == 5 && $verparts[2] >= 31)))
{
print "WARNING! Flex install not found, or unsupported Flex version.\n";
print "echo Attempting to build without.\n";
exit 0;
}
my $input = shift;
if ($input !~ /\.l$/)
{
print "Input must be a .l file\n";
exit 1;
}
elsif (!-e $input)
{
print "Input file $input not found\n";
exit 1;
}
(my $output = $input) =~ s/\.l$/.c/;
# get flex flags from make file
my $makefile = dirname($input) . "/Makefile";
my ($mf, $make);
open($mf, '<', $makefile);
local $/ = undef;
$make = <$mf>;
close($mf);
my $basetarg = basename($output);
my $flexflags = ($make =~ /^$basetarg:\s*FLEXFLAGS\s*=\s*(\S.*)/m ? $1 : '');
system("flex $flexflags -o$output $input");
if ($? == 0)
{
# Check for "%option reentrant" in .l file.
my $lfile;
open($lfile, '<', $input) || die "opening $input for reading: $!";
my $lcode = <$lfile>;
close($lfile);
if ($lcode =~ /\%option\sreentrant/)
{
# Reentrant scanners usually need a fix to prevent
# "unused variable" warnings with older flex versions.
system("perl src\\tools\\fix-old-flex-code.pl $output");
}
else
{
# For non-reentrant scanners we need to fix up the yywrap
# macro definition to keep the MS compiler happy.
# For reentrant scanners (like the core scanner) we do not
# need to (and must not) change the yywrap definition.
my $cfile;
open($cfile, '<', $output) || die "opening $output for reading: $!";
my $ccode = <$cfile>;
close($cfile);
$ccode =~ s/yywrap\(n\)/yywrap()/;
open($cfile, '>', $output) || die "opening $output for writing: $!";
print $cfile $ccode;
close($cfile);
}
if ($flexflags =~ /\s-b\s/)
{
my $lexback = "lex.backup";
open($lfile, '<', $lexback) || die "opening $lexback for reading: $!";
my $lexbacklines = <$lfile>;
close($lfile);
my $linecount = $lexbacklines =~ tr /\n/\n/;
if ($linecount != 1)
{
print "Scanner requires backup, see lex.backup.\n";
exit 1;
}
unlink $lexback;
}
exit 0;
}
else
{
exit $? >> 8;
}
|
