ecpg: Output dir, source dir, stamp file argument for preproc/*.pl

This is in preparation for building postgres with meson / ninja.

When building with meson, commands are run at the root of the build tree. Add
an option to put build output into the appropriate place. This can be utilized
by src/tools/msvc/ for a minor simplification, which also provides some
coverage for the new option.

Add option to generate a timestamp for check_rules.pl, so that proper
dependencies on it having been run can be generated.

Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Discussion: https://postgr.es/m/5e216522-ba3c-f0e6-7f97-5276d0270029@enterprisedb.com

src/interfaces/ecpg/preproc/Makefile

@@ -65,8 +65,8 @@ preproc.h: preproc.c
 preproc.c: BISONFLAGS += -d
 
 preproc.y: ../../../backend/parser/gram.y parse.pl ecpg.addons ecpg.header ecpg.tokens ecpg.trailer ecpg.type
-	$(PERL) $(srcdir)/parse.pl $(srcdir) < $< > $@
-	$(PERL) $(srcdir)/check_rules.pl $(srcdir) $<
+	$(PERL) $(srcdir)/parse.pl --srcdir $(srcdir) --parser $< --output $@
+	$(PERL) $(srcdir)/check_rules.pl --srcdir $(srcdir) --parser $<
 
 # generate keyword headers
 c_kwlist_d.h: c_kwlist.h $(GEN_KEYWORDLIST_DEPS)

src/interfaces/ecpg/preproc/check_rules.pl

@@ -19,16 +19,20 @@
 use strict;
 use warnings;
 no warnings 'uninitialized';
+use Getopt::Long;
 
+my $srcdir  = '.';
+my $parser  = '../../../backend/parser/gram.y';
+my $stamp   = '';
 my $verbose = 0;
-if ($ARGV[0] eq '-v')
-{
-	$verbose = shift;
-}
-my $path   = shift || '.';
-my $parser = shift || '../../../backend/parser/gram.y';
 
-my $filename = $path . "/ecpg.addons";
+GetOptions(
+	'srcdir=s' => \$srcdir,
+	'parser=s' => \$parser,
+	'stamp=s'  => \$stamp,
+	'verbose'  => \$verbose,) or die "wrong arguments";
+
+my $filename = "$srcdir/ecpg.addons";
 if ($verbose)
 {
 	print "parser: $parser\n";
@@ -188,4 +192,10 @@ if ($verbose)
 	print "$cc rules checked\n";
 }
 
+if ($stamp)
+{
+	open my $stampfh, '>', $stamp or die $!;
+	close $stampfh;
+}
+
 exit $ret;

src/interfaces/ecpg/preproc/parse.pl

@@ -15,9 +15,20 @@
 use strict;
 use warnings;
 no warnings 'uninitialized';
+use Getopt::Long;
 
-my $path = shift @ARGV;
-$path = "." unless $path;
+my $srcdir  = '.';
+my $outfile = '';
+my $parser  = '';
+
+GetOptions(
+	'srcdir=s' => \$srcdir,
+	'output=s' => \$outfile,
+	'parser=s' => \$parser,) or die "wrong arguments";
+
+# open parser / output file early, to raise errors early
+open(our $parserfh, '<', $parser) or die "could not open parser file $parser";
+open(our $outfh, '>', $outfile) or die "could not open output file $outfile";
 
 my $copymode              = 0;
 my $brace_indent          = 0;
@@ -128,15 +139,17 @@ dump_buffer('tokens');
 dump_buffer('types');
 dump_buffer('ecpgtype');
 dump_buffer('orig_tokens');
-print '%%',                "\n";
-print 'prog: statements;', "\n";
+print $outfh '%%',                "\n";
+print $outfh 'prog: statements;', "\n";
 dump_buffer('rules');
 include_file('trailer', 'ecpg.trailer');
 dump_buffer('trailer');
 
+close($parserfh);
+
 sub main
 {
-  line: while (<>)
+  line: while (<$parserfh>)
 	{
 		if (/ERRCODE_FEATURE_NOT_SUPPORTED/)
 		{
@@ -442,7 +455,7 @@ sub main
 sub include_file
 {
 	my ($buffer, $filename) = @_;
-	my $full = "$path/$filename";
+	my $full = "$srcdir/$filename";
 	open(my $fh, '<', $full) or die;
 	while (<$fh>)
 	{
@@ -498,9 +511,9 @@ sub add_to_buffer
 sub dump_buffer
 {
 	my ($buffer) = @_;
-	print '/* ', $buffer, ' */', "\n";
+	print $outfh '/* ', $buffer, ' */', "\n";
 	my $ref = $buff{$buffer};
-	print @$ref;
+	print $outfh @$ref;
 	return;
 }
 
@@ -652,7 +665,7 @@ sub dump_line
 
 sub preload_addons
 {
-	my $filename = $path . "/ecpg.addons";
+	my $filename = $srcdir . "/ecpg.addons";
 	open(my $fh, '<', $filename) or die;
 
 	# there may be multiple lines starting ECPG: and then multiple lines of code.

src/tools/msvc/Solution.pm

@@ -746,9 +746,8 @@ sub GenerateFiles
 			'src/backend/parser/gram.y'))
 	{
 		print "Generating preproc.y...\n";
-		chdir('src/interfaces/ecpg/preproc');
-		system('perl parse.pl < ../../../backend/parser/gram.y > preproc.y');
-		chdir('../../../..');
+		my $ecpg = 'src/interfaces/ecpg';
+		system("perl $ecpg/preproc/parse.pl --srcdir $ecpg/preproc --parser src/backend/parser/gram.y --output $ecpg/preproc/preproc.y");
 	}
 
 	unless (-f "src/port/pg_config_paths.h")