Redo MSVC build implementation for pg_xlogdump.

The previous commit didn't work on MSVC editions earlier than
Visual Studio 2011, apparently. This works by copying files into the
contrib directory, and making provision to clean them up, which should
work on all editions.

src/tools/msvc/Mkvcbuild.pm

@@ -13,6 +13,7 @@ use Project;
 use Solution;
 use Cwd;
 use File::Copy;
+use File::Basename;
 use Config;
 use VSObjectFactory;
 use List::Util qw(first);
@@ -49,8 +50,6 @@ my $contrib_extraincludes =
 my $contrib_extrasource = {
 	'cube' => [ 'cubescan.l', 'cubeparse.y' ],
 	'seg'  => [ 'segscan.l',  'segparse.y' ], 
-	'pg_xlogdump' => [ '../../src/backend/access/transam/xlogreader.c',
-			   map { "../../$_" } glob('src/backend/access/rmgrdesc/*desc.c') ],
 	};
 my @contrib_excludes = ('pgcrypto', 'intagg', 'sepgsql');
 
@@ -586,9 +585,19 @@ sub mkvcbuild
 	$pgregress->AddDefine('HOST_TUPLE="i686-pc-win32vc"');
 	$pgregress->AddReference($libpgport, $libpgcommon);
 
-	my $pg_xlogdump = (grep {$_->{name} eq 'pg_xlogdump'} @{$solution->{projects}->{contrib}} )[0];
-	delete $pg_xlogdump->{files}->{'contrib\\pg_xlogdump\\xlogreader.c'};
+	# fix up pg_xlogdump once it's been set up
+	# files symlinked on Unix are copied on windows
+	my $pg_xlogdump = (grep {$_->{name} eq 'pg_xlogdump'} 
+					   @{$solution->{projects}->{contrib}} )[0];
 	$pg_xlogdump->AddDefine('FRONTEND');
+	foreach my $xf (glob('src/backend/access/rmgrdesc/*desc.c') )
+	{
+		my $bf = basename $xf;
+		copy($xf,"contrib/pg_xlogdump/$bf");
+		$pg_xlogdump->AddFile("contrib\\pg_xlogdump\\$bf");
+	}
+	copy('src/backend/access/transam/xlogreader.c',
+		 'contrib/pg_xlogdump/xlogreader.c'); 
 
 	$solution->Save();
 	return $solution->{vcver};

src/tools/msvc/clean.bat

@@ -78,6 +78,11 @@ REM Clean up datafiles built with contrib
 REM cd contrib
 REM for /r %%f in (*.sql) do if exist %%f.in del %%f
 
+REM clean up files copied into contrib\pg_xlogdump
+if exist contrib\pg_xlogdump\xlogreader.c del /q contrib\pg_xlogdump\xlogreader.c
+for %%f in (contrib\pg_xlogdump\*desc.c) do if not %%f==contrib\pg_xlogdump\rmgrdesc.c del /q %%f
+
+
 cd %D%
 
 REM Clean up ecpg regression test files