From 41ba2ca080fe98ac4dc599f1e88328b030af8ace Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Fri, 5 May 2017 12:05:34 -0300
Subject: [PATCH] Allow MSVC to build with Tcl 8.6.

Commit eaba54c20c5 added support for Tcl 8.6 for configure-supported
platforms after verifying that pltcl works without further changes, but
the MSVC tooling wasn't updated accordingly.  Update MSVC to match,
restructuring the code to avoid duplicating the logic for every Tcl
version supported.

Backpatch to all live branches, like eaba54c20c5.  In 9.4 and previous,
change the patch to use backslashes rather than forward, as in the rest
of the file.

Reported by Paresh More, who also tested the patch I provided.
Discussion: https://postgr.es/m/CAAgiCNGVw3ssBtSi3ZNstrz5k00ax=UV+_ZEHUeW_LMSGL2sew@mail.gmail.com
---
 src/tools/msvc/Mkvcbuild.pm | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 304edf915f9..6085ae5a387 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -249,20 +249,24 @@ sub mkvcbuild
 
 	if ($solution->{options}->{tcl})
 	{
+		my $found = 0;
 		my $pltcl =
 		  $solution->AddProject('pltcl', 'dll', 'PLs', 'src\pl\tcl');
 		$pltcl->AddIncludeDir($solution->{options}->{tcl} . '\include');
 		$pltcl->AddReference($postgres);
-		if (-e $solution->{options}->{tcl} . '\lib\tcl85.lib')
+
+		for my $tclver (qw(86t 85 84))
 		{
-			$pltcl->AddLibrary(
-				$solution->{options}->{tcl} . '\lib\tcl85.lib');
-		}
-		else
-		{
-			$pltcl->AddLibrary(
-				$solution->{options}->{tcl} . '\lib\tcl84.lib');
+			my $tcllib = $solution->{options}->{tcl} . "\\lib\\tcl$tclver.lib";
+			if (-e $tcllib)
+			{
+				$pltcl->AddLibrary($tcllib);
+				$found = 1;
+				last;
+			}
 		}
+		die "Unable to find $solution->{options}->{tcl}\\lib\\tcl<version>.lib"
+			unless $found;
 	}
 
 	$libpq = $solution->AddProject('libpq', 'dll', 'interfaces',