Remove support for Visual Studio 2013

diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index a0490a7..5595760 100644
--- a/src/backend/utils/adt/pg_locale.c
+++ b/src/backend/utils/adt/pg_locale.c
@@ -1757,7 +1757,7 @@ get_collation_actual_version(char collprovider, const char *collcollate)
 							collcollate,
 							GetLastError())));
 		}
-		collversion = psprintf("%d.%d,%d.%d",
+		collversion = psprintf("%ld.%ld,%ld.%ld",
 							   (version.dwNLSVersion >> 8) & 0xFFFF,
 							   version.dwNLSVersion & 0xFF,
 							   (version.dwDefinedVersion >> 8) & 0xFFFF,

From 86b838c70b30998a981f6e53cacb0885963eda66 Mon Sep 17 00:00:00 2001
From: Michael Paquier <michael@paquier.xyz>
Date: Mon, 30 May 2022 16:44:22 +0900
Subject: [PATCH v2] Remove support for VS 2013

---
 src/include/port/win32.h              | 10 +++----
 src/include/port/win32_port.h         |  7 +----
 src/backend/main/main.c               | 22 ---------------
 src/backend/optimizer/path/costsize.c |  4 +--
 src/backend/utils/adt/float.c         |  6 +---
 src/backend/utils/adt/pg_locale.c     | 40 ---------------------------
 src/port/chklocale.c                  | 33 ++++------------------
 src/port/strtof.c                     |  9 ------
 doc/src/sgml/install-windows.sgml     | 10 +++----
 configure                             |  7 ++---
 configure.ac                          |  7 ++---
 src/tools/msvc/MSBuildProject.pm      | 27 +-----------------
 src/tools/msvc/README                 |  8 +++---
 src/tools/msvc/Solution.pm            | 28 -------------------
 src/tools/msvc/VSObjectFactory.pm     | 12 ++------
 15 files changed, 30 insertions(+), 200 deletions(-)

diff --git a/src/include/port/win32.h b/src/include/port/win32.h
index c6213c77c3..539f3ec6d1 100644
--- a/src/include/port/win32.h
+++ b/src/include/port/win32.h
@@ -11,12 +11,12 @@
 
 /*
  * Make sure _WIN32_WINNT has the minimum required value.
- * Leave a higher value in place. When building with at least Visual
- * Studio 2015 the minimum requirement is Windows Vista (0x0600) to
- * get support for GetLocaleInfoEx() with locales. For everything else
- * the minimum version is Windows XP (0x0501).
+ * Leave a higher value in place. When building with Visual Studio the
+ * minimum requirement is Windows Vista (0x0600) to get support for
+ * GetLocaleInfoEx() with locales. For everything else the minimum
+ * version is Windows XP (0x0501).
  */
-#if defined(_MSC_VER) && _MSC_VER >= 1900
+#ifdef _MSC_VER
 #define MIN_WINNT 0x0600
 #else
 #define MIN_WINNT 0x0501
diff --git a/src/include/port/win32_port.h b/src/include/port/win32_port.h
index dbbf88f8e8..c0225603f2 100644
--- a/src/include/port/win32_port.h
+++ b/src/include/port/win32_port.h
@@ -531,13 +531,8 @@ typedef unsigned short mode_t;
 
 #endif							/* _MSC_VER */
 
-#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || \
-	defined(__MINGW32__) || defined(__MINGW64__)
+#if  defined(__MINGW32__) || defined(__MINGW64__)
 /*
- * VS2013 has a strtof() that seems to give correct answers for valid input,
- * even on the rounding edge cases, but which doesn't handle out-of-range
- * input correctly. Work around that.
- *
  * Mingw claims to have a strtof, and my reading of its source code suggests
  * that it ought to work (and not need this hack), but the regression test
  * results disagree with me; whether this is a version issue or not is not
diff --git a/src/backend/main/main.c b/src/backend/main/main.c
index c43a527d3f..bb782fa1ec 100644
--- a/src/backend/main/main.c
+++ b/src/backend/main/main.c
@@ -30,11 +30,6 @@
 #include <sys/param.h>
 #endif
 
-#if defined(_M_AMD64) && _MSC_VER == 1800
-#include <math.h>
-#include <versionhelpers.h>
-#endif
-
 #include "bootstrap/bootstrap.h"
 #include "common/username.h"
 #include "port/atomics.h"
@@ -290,23 +285,6 @@ startup_hacks(const char *progname)
 		_CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
 		_CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
 		_CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDERR);
-
-#if defined(_M_AMD64) && _MSC_VER == 1800
-
-		/*----------
-		 * Avoid crashing in certain floating-point operations if we were
-		 * compiled for x64 with MS Visual Studio 2013 and are running on
-		 * Windows prior to 7/2008R2 SP1 on an AVX2-capable CPU.
-		 *
-		 * Ref: https://connect.microsoft.com/VisualStudio/feedback/details/811093/visual-studio-2013-rtm-c-x64-code-generation-bug-for-avx2-instructions
-		 *----------
-		 */
-		if (!IsWindows7SP1OrGreater())
-		{
-			_set_FMA3_enable(0);
-		}
-#endif							/* defined(_M_AMD64) && _MSC_VER == 1800 */
-
 	}
 #endif							/* WIN32 */
 
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
index fcc26b01a4..5e5732f6e1 100644
--- a/src/backend/optimizer/path/costsize.c
+++ b/src/backend/optimizer/path/costsize.c
@@ -5445,10 +5445,8 @@ calc_joinrel_size_estimate(PlannerInfo *root,
 						   double outer_rows,
 						   double inner_rows,
 						   SpecialJoinInfo *sjinfo,
-						   List *restrictlist_in)
+						   List *restrictlist)
 {
-	/* This apparently-useless variable dodges a compiler bug in VS2013: */
-	List	   *restrictlist = restrictlist_in;
 	JoinType	jointype = sjinfo->jointype;
 	Selectivity fkselec;
 	Selectivity jselec;
diff --git a/src/backend/utils/adt/float.c b/src/backend/utils/adt/float.c
index 63bb0f2277..fc8f39a7a9 100644
--- a/src/backend/utils/adt/float.c
+++ b/src/backend/utils/adt/float.c
@@ -249,13 +249,9 @@ float4in(PG_FUNCTION_ARGS)
 			 * precision).  We'd prefer not to throw error for that, so try to
 			 * detect whether it's a "real" out-of-range condition by checking
 			 * to see if the result is zero or huge.
-			 *
-			 * Use isinf() rather than HUGE_VALF on VS2013 because it
-			 * generates a spurious overflow warning for -HUGE_VALF.  Also use
-			 * isinf() if HUGE_VALF is missing.
 			 */
 			if (val == 0.0 ||
-#if !defined(HUGE_VALF) || (defined(_MSC_VER) && (_MSC_VER < 1900))
+#if !defined(HUGE_VALF)
 				isinf(val)
 #else
 				(val >= HUGE_VALF || val <= -HUGE_VALF)
diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index a0490a7522..34bd8d424e 100644
--- a/src/backend/utils/adt/pg_locale.c
+++ b/src/backend/utils/adt/pg_locale.c
@@ -960,7 +960,6 @@ cache_locale_time(void)
  * [2] https://docs.microsoft.com/en-us/windows/win32/intl/locale-names
  */
 
-#if _MSC_VER >= 1900
 /*
  * Callback function for EnumSystemLocalesEx() in get_iso_localename().
  *
@@ -1110,7 +1109,6 @@ get_iso_localename(const char *winlocname)
 
 	return NULL;
 }
-#endif							/* _MSC_VER >= 1900 */
 
 static char *
 IsoLocaleName(const char *winlocname)
@@ -1125,46 +1123,8 @@ IsoLocaleName(const char *winlocname)
 		return iso_lc_messages;
 	}
 	else
-	{
-#if (_MSC_VER >= 1900)			/* Visual Studio 2015 or later */
 		return get_iso_localename(winlocname);
-#else
-		_locale_t	loct;
 
-		loct = _create_locale(LC_CTYPE, winlocname);
-		if (loct != NULL)
-		{
-			size_t		rc;
-			char	   *hyphen;
-
-			/* Locale names use only ASCII, any conversion locale suffices. */
-			rc = wchar2char(iso_lc_messages, loct->locinfo->locale_name[LC_CTYPE],
-							sizeof(iso_lc_messages), NULL);
-			_free_locale(loct);
-			if (rc == -1 || rc == sizeof(iso_lc_messages))
-				return NULL;
-
-			/*
-			 * Since the message catalogs sit on a case-insensitive
-			 * filesystem, we need not standardize letter case here.  So long
-			 * as we do not ship message catalogs for which it would matter,
-			 * we also need not translate the script/variant portion, e.g.
-			 * uz-Cyrl-UZ to uz_UZ@cyrillic.  Simply replace the hyphen with
-			 * an underscore.
-			 *
-			 * Note that the locale name can be less-specific than the value
-			 * we would derive under earlier Visual Studio releases.  For
-			 * example, French_France.1252 yields just "fr".  This does not
-			 * affect any of the country-specific message catalogs available
-			 * as of this writing (pt_BR, zh_CN, zh_TW).
-			 */
-			hyphen = strchr(iso_lc_messages, '-');
-			if (hyphen)
-				*hyphen = '_';
-			return iso_lc_messages;
-		}
-#endif							/* Visual Studio 2015 or later */
-	}
 #endif							/* defined(_MSC_VER) */
 	return NULL;				/* Not supported on this version of msvc/mingw */
 }
diff --git a/src/port/chklocale.c b/src/port/chklocale.c
index c85d8da3c8..2aaf2ae8c0 100644
--- a/src/port/chklocale.c
+++ b/src/port/chklocale.c
@@ -191,19 +191,10 @@ static const struct encoding_match encoding_match_list[] = {
 /*
  * On Windows, use CP<code page number> instead of the nl_langinfo() result
  *
- * Visual Studio 2012 expanded the set of valid LC_CTYPE values, so have its
- * locale machinery determine the code page.  See comments at IsoLocaleName().
- * For other compilers, follow the locale's predictable format.
- *
- * Visual Studio 2015 should still be able to do the same, but the declaration
- * of lc_codepage is missing in _locale_t, causing this code compilation to
- * fail, hence this falls back instead on GetLocaleInfoEx. VS 2015 may be an
- * exception and post-VS2015 versions should be able to handle properly the
- * codepage number using _create_locale(). So, instead of the same logic as
- * VS 2012 and VS 2013, this routine uses GetLocaleInfoEx to parse short
- * locale names like "de-DE", "fr-FR", etc. If those cannot be parsed correctly
- * process falls back to the pre-VS-2010 manual parsing done with
- * using <Language>_<Country>.<CodePage> as a base.
+ * This routine uses GetLocaleInfoEx() to parse short locale names like
+ * "de-DE", "fr-FR", etc.  If those cannot be parsed correctly process falls
+ * back to the pre-VS-2010 manual parsing done with using
+ * <Language>_<Country>.<CodePage> as a base.
  *
  * Returns a malloc()'d string for the caller to free.
  */
@@ -211,22 +202,9 @@ static char *
 win32_langinfo(const char *ctype)
 {
 	char	   *r = NULL;
-
-#if defined(_MSC_VER) && (_MSC_VER < 1900)
-	_locale_t	loct = NULL;
-
-	loct = _create_locale(LC_CTYPE, ctype);
-	if (loct != NULL)
-	{
-		r = malloc(16);			/* excess */
-		if (r != NULL)
-			sprintf(r, "CP%u", loct->locinfo->lc_codepage);
-		_free_locale(loct);
-	}
-#else
 	char	   *codepage;
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1900)
+#if defined(_MSC_VER)
 	uint32		cp;
 	WCHAR		wctype[LOCALE_NAME_MAX_LENGTH];
 
@@ -279,7 +257,6 @@ win32_langinfo(const char *ctype)
 			}
 		}
 	}
-#endif
 
 	return r;
 }
diff --git a/src/port/strtof.c b/src/port/strtof.c
index 7da05be687..314fcc9851 100644
--- a/src/port/strtof.c
+++ b/src/port/strtof.c
@@ -54,15 +54,6 @@ strtof(const char *nptr, char **endptr)
 
 #elif HAVE_BUGGY_STRTOF
 /*
- * On Windows, there's a slightly different problem: VS2013 has a strtof()
- * that returns the correct results for valid input, but may fail to report an
- * error for underflow or overflow, returning 0 instead. Work around that by
- * trying strtod() when strtof() returns 0.0 or [+-]Inf, and calling it an
- * error if the result differs. Also, strtof() doesn't handle subnormal input
- * well, so prefer to round the strtod() result in such cases. (Normally we'd
- * just say "too bad" if strtof() doesn't support subnormals, but since we're
- * already in here fixing stuff, we might as well do the best fix we can.)
- *
  * Cygwin has a strtof() which is literally just (float)strtod(), which means
  * we can't avoid the double-rounding problem; but using this wrapper does get
  * us proper over/underflow checks. (Also, if they fix their strtof(), the
diff --git a/doc/src/sgml/install-windows.sgml b/doc/src/sgml/install-windows.sgml
index bcfd5a1a10..ef30e797e3 100644
--- a/doc/src/sgml/install-windows.sgml
+++ b/doc/src/sgml/install-windows.sgml
@@ -22,7 +22,7 @@
   <productname>Windows</productname>. The simplest way to build with
   Microsoft tools is to install <productname>Visual Studio 2022</productname>
   and use the included compiler. It is also possible to build with the full
-  <productname>Microsoft Visual C++ 2013 to 2022</productname>.
+  <productname>Microsoft Visual C++ 2015 to 2022</productname>.
   In some cases that requires the installation of the
   <productname>Windows SDK</productname> in addition to the compiler.
  </para>
@@ -77,19 +77,17 @@
  <para>
   Both 32-bit and 64-bit builds are possible with the Microsoft Compiler suite.
   32-bit PostgreSQL builds are possible with
-  <productname>Visual Studio 2013</productname> to
+  <productname>Visual Studio 2015</productname> to
   <productname>Visual Studio 2022</productname>,
   as well as standalone Windows SDK releases 8.1a to 10.
   64-bit PostgreSQL builds are supported with
   <productname>Microsoft Windows SDK</productname> version 8.1a to 10 or
-  <productname>Visual Studio 2013</productname> and above. Compilation
+  <productname>Visual Studio 2015</productname> and above. Compilation
   is supported down to <productname>Windows 7</productname> and
   <productname>Windows Server 2008 R2 SP1</productname> when building with
-  <productname>Visual Studio 2013</productname> to
+  <productname>Visual Studio 2015</productname> to
   <productname>Visual Studio 2022</productname>.
    <!--
-       For 2013 requirements:
-       https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2013-sysrequirements-vs
        For 2015 requirements:
        https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2015-sysrequirements-vs
        For 2017 requirements:
diff --git a/configure b/configure
index 7dec6b7bf9..e77fa2ca34 100755
--- a/configure
+++ b/configure
@@ -16909,10 +16909,9 @@ fi
 
 if test "$PORTNAME" = "win32" -o "$PORTNAME" = "cygwin"; then
 	# Cygwin and (apparently, based on test results) Mingw both
-	# have a broken strtof(), so substitute the same replacement
-	# code we use with VS2013. That's not a perfect fix, since
-	# (unlike with VS2013) it doesn't avoid double-rounding, but
-	# we have no better options. To get that, though, we have to
+	# have a broken strtof(), so substitute its implementation.
+	# That's not a perfect fix, since it doesn't avoid double-rounding,
+	# but we have no better options. To get that, though, we have to
 	# force the file to be compiled despite HAVE_STRTOF.
 	case " $LIBOBJS " in
   *" strtof.$ac_objext "* ) ;;
diff --git a/configure.ac b/configure.ac
index d093fb88dd..a6fd901141 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1927,10 +1927,9 @@ fi
 
 if test "$PORTNAME" = "win32" -o "$PORTNAME" = "cygwin"; then
 	# Cygwin and (apparently, based on test results) Mingw both
-	# have a broken strtof(), so substitute the same replacement
-	# code we use with VS2013. That's not a perfect fix, since
-	# (unlike with VS2013) it doesn't avoid double-rounding, but
-	# we have no better options. To get that, though, we have to
+	# have a broken strtof(), so substitute its implementation.
+	# That's not a perfect fix, since it doesn't avoid double-rounding,
+	# but we have no better options. To get that, though, we have to
 	# force the file to be compiled despite HAVE_STRTOF.
 	AC_LIBOBJ([strtof])
 	AC_MSG_NOTICE([On $host_os we will use our strtof wrapper.])
diff --git a/src/tools/msvc/MSBuildProject.pm b/src/tools/msvc/MSBuildProject.pm
index f24d9e5348..62acdda3a1 100644
--- a/src/tools/msvc/MSBuildProject.pm
+++ b/src/tools/msvc/MSBuildProject.pm
@@ -4,7 +4,7 @@
 package MSBuildProject;
 
 #
-# Package that encapsulates a MSBuild project file (Visual C++ 2013 or greater)
+# Package that encapsulates a MSBuild project file (Visual C++ 2015 or greater)
 #
 # src/tools/msvc/MSBuildProject.pm
 #
@@ -405,31 +405,6 @@ EOF
 	return;
 }
 
-package VC2013Project;
-
-#
-# Package that encapsulates a Visual C++ 2013 project file
-#
-
-use strict;
-use warnings;
-use base qw(MSBuildProject);
-
-no warnings qw(redefine);    ## no critic
-
-sub new
-{
-	my $classname = shift;
-	my $self      = $classname->SUPER::_new(@_);
-	bless($self, $classname);
-
-	$self->{vcver}           = '12.00';
-	$self->{PlatformToolset} = 'v120';
-	$self->{ToolsVersion}    = '12.0';
-
-	return $self;
-}
-
 package VC2015Project;
 
 #
diff --git a/src/tools/msvc/README b/src/tools/msvc/README
index 473d6f425b..1c36925258 100644
--- a/src/tools/msvc/README
+++ b/src/tools/msvc/README
@@ -4,7 +4,7 @@ MSVC build
 ==========
 
 This directory contains the tools required to build PostgreSQL using
-Microsoft Visual Studio 2013 - 2022. This builds the whole backend, not just
+Microsoft Visual Studio 2015 - 2022. This builds the whole backend, not just
 the libpq frontend library. For more information, see the documentation
 chapter "Installation on Windows" and the description below.
 
@@ -67,7 +67,7 @@ Install.pm             module containing the install logic
 Mkvcbuild.pm           module containing the code to generate the Visual
                        Studio build (project/solution) files
 MSBuildProject.pm      module containing the code to generate MSBuild based
-                       project files (Visual Studio 2013 or greater)
+                       project files (Visual Studio 2015 or greater)
 Project.pm             module containing the common code to generate the
                        Visual Studio project files. Also provides the
                        common interface of all project file generators
@@ -88,10 +88,10 @@ config_default.pl to create the configuration arguments.
 These configuration arguments are passed over to Mkvcbuild::mkvcbuild
 (Mkvcbuild.pm) which creates the Visual Studio project and solution files.
 It does this by using VSObjectFactory::CreateSolution to create an object
-implementing the Solution interface (this could be either VS2013Solution,
+implementing the Solution interface (this could be either
 VS2015Solution, VS2017Solution, VS2019Solution or VS2022Solution, all in
 Solution.pm, depending on the user's build environment) and adding objects
-implementing the corresponding Project interface (VC2013Project,
+implementing the corresponding Project interface (
 VC2015Project, VC2017Project, VC2019Project or VC2022Project from
 MSBuildProject.pm) to it. When Solution::Save is called, the implementations
 of Solution and Project save their content in the appropriate format.
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index d30e8fcb11..a4a2c637ff 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -1218,34 +1218,6 @@ sub GetFakeConfigure
 	return $cfg;
 }
 
-package VS2013Solution;
-
-#
-# Package that encapsulates a Visual Studio 2013 solution file
-#
-
-use Carp;
-use strict;
-use warnings;
-use base qw(Solution);
-
-no warnings qw(redefine);    ## no critic
-
-sub new
-{
-	my $classname = shift;
-	my $self      = $classname->SUPER::_new(@_);
-	bless($self, $classname);
-
-	$self->{solutionFileVersion}        = '12.00';
-	$self->{vcver}                      = '12.00';
-	$self->{visualStudioName}           = 'Visual Studio 2013';
-	$self->{VisualStudioVersion}        = '12.0.21005.1';
-	$self->{MinimumVisualStudioVersion} = '10.0.40219.1';
-
-	return $self;
-}
-
 package VS2015Solution;
 
 #
diff --git a/src/tools/msvc/VSObjectFactory.pm b/src/tools/msvc/VSObjectFactory.pm
index 9f9712b793..975ccf2ee5 100644
--- a/src/tools/msvc/VSObjectFactory.pm
+++ b/src/tools/msvc/VSObjectFactory.pm
@@ -33,11 +33,7 @@ sub CreateSolution
 		$visualStudioVersion = DetermineVisualStudioVersion();
 	}
 
-	if ($visualStudioVersion eq '12.00')
-	{
-		return new VS2013Solution(@_);
-	}
-	elsif ($visualStudioVersion eq '14.00')
+	if ($visualStudioVersion eq '14.00')
 	{
 		return new VS2015Solution(@_);
 	}
@@ -87,11 +83,7 @@ sub CreateProject
 		$visualStudioVersion = DetermineVisualStudioVersion();
 	}
 
-	if ($visualStudioVersion eq '12.00')
-	{
-		return new VC2013Project(@_);
-	}
-	elsif ($visualStudioVersion eq '14.00')
+	if ($visualStudioVersion eq '14.00')
 	{
 		return new VC2015Project(@_);
 	}
-- 
2.36.1

From c685a8f1617e585e88a16689f7b4f4e338417bca Mon Sep 17 00:00:00 2001
From: Michael Paquier <michael@paquier.xyz>
Date: Thu, 7 Jul 2022 16:45:32 +0900
Subject: [PATCH v3] Remove support for VS 2013

---
 src/include/port/win32_port.h         |  7 +----
 src/backend/main/main.c               |  5 ----
 src/backend/optimizer/path/costsize.c |  4 +--
 src/backend/utils/adt/float.c         |  6 +---
 src/backend/utils/adt/pg_locale.c     | 40 ---------------------------
 src/port/chklocale.c                  | 33 ++++------------------
 src/port/strtof.c                     |  9 ------
 doc/src/sgml/install-windows.sgml     |  8 ++----
 configure                             |  7 ++---
 configure.ac                          |  7 ++---
 src/tools/msvc/MSBuildProject.pm      | 27 +-----------------
 src/tools/msvc/README                 |  8 +++---
 src/tools/msvc/Solution.pm            | 28 -------------------
 src/tools/msvc/VSObjectFactory.pm     | 12 ++------
 14 files changed, 24 insertions(+), 177 deletions(-)

diff --git a/src/include/port/win32_port.h b/src/include/port/win32_port.h
index dbbf88f8e8..5121c0c626 100644
--- a/src/include/port/win32_port.h
+++ b/src/include/port/win32_port.h
@@ -531,13 +531,8 @@ typedef unsigned short mode_t;
 
 #endif							/* _MSC_VER */
 
-#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || \
-	defined(__MINGW32__) || defined(__MINGW64__)
+#if defined(__MINGW32__) || defined(__MINGW64__)
 /*
- * VS2013 has a strtof() that seems to give correct answers for valid input,
- * even on the rounding edge cases, but which doesn't handle out-of-range
- * input correctly. Work around that.
- *
  * Mingw claims to have a strtof, and my reading of its source code suggests
  * that it ought to work (and not need this hack), but the regression test
  * results disagree with me; whether this is a version issue or not is not
diff --git a/src/backend/main/main.c b/src/backend/main/main.c
index dd82722ee3..bb782fa1ec 100644
--- a/src/backend/main/main.c
+++ b/src/backend/main/main.c
@@ -30,11 +30,6 @@
 #include <sys/param.h>
 #endif
 
-#if defined(_M_AMD64) && _MSC_VER == 1800
-#include <math.h>
-#include <versionhelpers.h>
-#endif
-
 #include "bootstrap/bootstrap.h"
 #include "common/username.h"
 #include "port/atomics.h"
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
index fcc26b01a4..5e5732f6e1 100644
--- a/src/backend/optimizer/path/costsize.c
+++ b/src/backend/optimizer/path/costsize.c
@@ -5445,10 +5445,8 @@ calc_joinrel_size_estimate(PlannerInfo *root,
 						   double outer_rows,
 						   double inner_rows,
 						   SpecialJoinInfo *sjinfo,
-						   List *restrictlist_in)
+						   List *restrictlist)
 {
-	/* This apparently-useless variable dodges a compiler bug in VS2013: */
-	List	   *restrictlist = restrictlist_in;
 	JoinType	jointype = sjinfo->jointype;
 	Selectivity fkselec;
 	Selectivity jselec;
diff --git a/src/backend/utils/adt/float.c b/src/backend/utils/adt/float.c
index 63bb0f2277..fc8f39a7a9 100644
--- a/src/backend/utils/adt/float.c
+++ b/src/backend/utils/adt/float.c
@@ -249,13 +249,9 @@ float4in(PG_FUNCTION_ARGS)
 			 * precision).  We'd prefer not to throw error for that, so try to
 			 * detect whether it's a "real" out-of-range condition by checking
 			 * to see if the result is zero or huge.
-			 *
-			 * Use isinf() rather than HUGE_VALF on VS2013 because it
-			 * generates a spurious overflow warning for -HUGE_VALF.  Also use
-			 * isinf() if HUGE_VALF is missing.
 			 */
 			if (val == 0.0 ||
-#if !defined(HUGE_VALF) || (defined(_MSC_VER) && (_MSC_VER < 1900))
+#if !defined(HUGE_VALF)
 				isinf(val)
 #else
 				(val >= HUGE_VALF || val <= -HUGE_VALF)
diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index 5cf5dd5f87..607a4b7340 100644
--- a/src/backend/utils/adt/pg_locale.c
+++ b/src/backend/utils/adt/pg_locale.c
@@ -950,7 +950,6 @@ cache_locale_time(void)
  * [2] https://docs.microsoft.com/en-us/windows/win32/intl/locale-names
  */
 
-#if _MSC_VER >= 1900
 /*
  * Callback function for EnumSystemLocalesEx() in get_iso_localename().
  *
@@ -1100,7 +1099,6 @@ get_iso_localename(const char *winlocname)
 
 	return NULL;
 }
-#endif							/* _MSC_VER >= 1900 */
 
 static char *
 IsoLocaleName(const char *winlocname)
@@ -1115,46 +1113,8 @@ IsoLocaleName(const char *winlocname)
 		return iso_lc_messages;
 	}
 	else
-	{
-#if (_MSC_VER >= 1900)			/* Visual Studio 2015 or later */
 		return get_iso_localename(winlocname);
-#else
-		_locale_t	loct;
 
-		loct = _create_locale(LC_CTYPE, winlocname);
-		if (loct != NULL)
-		{
-			size_t		rc;
-			char	   *hyphen;
-
-			/* Locale names use only ASCII, any conversion locale suffices. */
-			rc = wchar2char(iso_lc_messages, loct->locinfo->locale_name[LC_CTYPE],
-							sizeof(iso_lc_messages), NULL);
-			_free_locale(loct);
-			if (rc == -1 || rc == sizeof(iso_lc_messages))
-				return NULL;
-
-			/*
-			 * Since the message catalogs sit on a case-insensitive
-			 * filesystem, we need not standardize letter case here.  So long
-			 * as we do not ship message catalogs for which it would matter,
-			 * we also need not translate the script/variant portion, e.g.
-			 * uz-Cyrl-UZ to uz_UZ@cyrillic.  Simply replace the hyphen with
-			 * an underscore.
-			 *
-			 * Note that the locale name can be less-specific than the value
-			 * we would derive under earlier Visual Studio releases.  For
-			 * example, French_France.1252 yields just "fr".  This does not
-			 * affect any of the country-specific message catalogs available
-			 * as of this writing (pt_BR, zh_CN, zh_TW).
-			 */
-			hyphen = strchr(iso_lc_messages, '-');
-			if (hyphen)
-				*hyphen = '_';
-			return iso_lc_messages;
-		}
-#endif							/* Visual Studio 2015 or later */
-	}
 #endif							/* defined(_MSC_VER) */
 	return NULL;				/* Not supported on this version of msvc/mingw */
 }
diff --git a/src/port/chklocale.c b/src/port/chklocale.c
index c85d8da3c8..2aaf2ae8c0 100644
--- a/src/port/chklocale.c
+++ b/src/port/chklocale.c
@@ -191,19 +191,10 @@ static const struct encoding_match encoding_match_list[] = {
 /*
  * On Windows, use CP<code page number> instead of the nl_langinfo() result
  *
- * Visual Studio 2012 expanded the set of valid LC_CTYPE values, so have its
- * locale machinery determine the code page.  See comments at IsoLocaleName().
- * For other compilers, follow the locale's predictable format.
- *
- * Visual Studio 2015 should still be able to do the same, but the declaration
- * of lc_codepage is missing in _locale_t, causing this code compilation to
- * fail, hence this falls back instead on GetLocaleInfoEx. VS 2015 may be an
- * exception and post-VS2015 versions should be able to handle properly the
- * codepage number using _create_locale(). So, instead of the same logic as
- * VS 2012 and VS 2013, this routine uses GetLocaleInfoEx to parse short
- * locale names like "de-DE", "fr-FR", etc. If those cannot be parsed correctly
- * process falls back to the pre-VS-2010 manual parsing done with
- * using <Language>_<Country>.<CodePage> as a base.
+ * This routine uses GetLocaleInfoEx() to parse short locale names like
+ * "de-DE", "fr-FR", etc.  If those cannot be parsed correctly process falls
+ * back to the pre-VS-2010 manual parsing done with using
+ * <Language>_<Country>.<CodePage> as a base.
  *
  * Returns a malloc()'d string for the caller to free.
  */
@@ -211,22 +202,9 @@ static char *
 win32_langinfo(const char *ctype)
 {
 	char	   *r = NULL;
-
-#if defined(_MSC_VER) && (_MSC_VER < 1900)
-	_locale_t	loct = NULL;
-
-	loct = _create_locale(LC_CTYPE, ctype);
-	if (loct != NULL)
-	{
-		r = malloc(16);			/* excess */
-		if (r != NULL)
-			sprintf(r, "CP%u", loct->locinfo->lc_codepage);
-		_free_locale(loct);
-	}
-#else
 	char	   *codepage;
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1900)
+#if defined(_MSC_VER)
 	uint32		cp;
 	WCHAR		wctype[LOCALE_NAME_MAX_LENGTH];
 
@@ -279,7 +257,6 @@ win32_langinfo(const char *ctype)
 			}
 		}
 	}
-#endif
 
 	return r;
 }
diff --git a/src/port/strtof.c b/src/port/strtof.c
index 7da05be687..314fcc9851 100644
--- a/src/port/strtof.c
+++ b/src/port/strtof.c
@@ -54,15 +54,6 @@ strtof(const char *nptr, char **endptr)
 
 #elif HAVE_BUGGY_STRTOF
 /*
- * On Windows, there's a slightly different problem: VS2013 has a strtof()
- * that returns the correct results for valid input, but may fail to report an
- * error for underflow or overflow, returning 0 instead. Work around that by
- * trying strtod() when strtof() returns 0.0 or [+-]Inf, and calling it an
- * error if the result differs. Also, strtof() doesn't handle subnormal input
- * well, so prefer to round the strtod() result in such cases. (Normally we'd
- * just say "too bad" if strtof() doesn't support subnormals, but since we're
- * already in here fixing stuff, we might as well do the best fix we can.)
- *
  * Cygwin has a strtof() which is literally just (float)strtod(), which means
  * we can't avoid the double-rounding problem; but using this wrapper does get
  * us proper over/underflow checks. (Also, if they fix their strtof(), the
diff --git a/doc/src/sgml/install-windows.sgml b/doc/src/sgml/install-windows.sgml
index 66567d17a0..afb004b5cf 100644
--- a/doc/src/sgml/install-windows.sgml
+++ b/doc/src/sgml/install-windows.sgml
@@ -22,7 +22,7 @@
   <productname>Windows</productname>. The simplest way to build with
   Microsoft tools is to install <productname>Visual Studio 2022</productname>
   and use the included compiler. It is also possible to build with the full
-  <productname>Microsoft Visual C++ 2013 to 2022</productname>.
+  <productname>Microsoft Visual C++ 2015 to 2022</productname>.
   In some cases that requires the installation of the
   <productname>Windows SDK</productname> in addition to the compiler.
  </para>
@@ -77,15 +77,13 @@
  <para>
   Both 32-bit and 64-bit builds are possible with the Microsoft Compiler suite.
   32-bit PostgreSQL builds are possible with
-  <productname>Visual Studio 2013</productname> to
+  <productname>Visual Studio 2015</productname> to
   <productname>Visual Studio 2022</productname>,
   as well as standalone Windows SDK releases 8.1a to 10.
   64-bit PostgreSQL builds are supported with
   <productname>Microsoft Windows SDK</productname> version 8.1a to 10 or
-  <productname>Visual Studio 2013</productname> and above.
+  <productname>Visual Studio 2015</productname> and above.
    <!--
-       For 2013 requirements:
-       https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2013-sysrequirements-vs
        For 2015 requirements:
        https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2015-sysrequirements-vs
        For 2017 requirements:
diff --git a/configure b/configure
index da177403ef..e64f5c4802 100755
--- a/configure
+++ b/configure
@@ -16904,10 +16904,9 @@ fi
 
 if test "$PORTNAME" = "win32" -o "$PORTNAME" = "cygwin"; then
 	# Cygwin and (apparently, based on test results) Mingw both
-	# have a broken strtof(), so substitute the same replacement
-	# code we use with VS2013. That's not a perfect fix, since
-	# (unlike with VS2013) it doesn't avoid double-rounding, but
-	# we have no better options. To get that, though, we have to
+	# have a broken strtof(), so substitute its implementation.
+	# That's not a perfect fix, since it doesn't avoid double-rounding,
+	# but we have no better options. To get that, though, we have to
 	# force the file to be compiled despite HAVE_STRTOF.
 	case " $LIBOBJS " in
   *" strtof.$ac_objext "* ) ;;
diff --git a/configure.ac b/configure.ac
index 6c6f997ee3..f6e831ee26 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1927,10 +1927,9 @@ fi
 
 if test "$PORTNAME" = "win32" -o "$PORTNAME" = "cygwin"; then
 	# Cygwin and (apparently, based on test results) Mingw both
-	# have a broken strtof(), so substitute the same replacement
-	# code we use with VS2013. That's not a perfect fix, since
-	# (unlike with VS2013) it doesn't avoid double-rounding, but
-	# we have no better options. To get that, though, we have to
+	# have a broken strtof(), so substitute its implementation.
+	# That's not a perfect fix, since it doesn't avoid double-rounding,
+	# but we have no better options. To get that, though, we have to
 	# force the file to be compiled despite HAVE_STRTOF.
 	AC_LIBOBJ([strtof])
 	AC_MSG_NOTICE([On $host_os we will use our strtof wrapper.])
diff --git a/src/tools/msvc/MSBuildProject.pm b/src/tools/msvc/MSBuildProject.pm
index f24d9e5348..62acdda3a1 100644
--- a/src/tools/msvc/MSBuildProject.pm
+++ b/src/tools/msvc/MSBuildProject.pm
@@ -4,7 +4,7 @@
 package MSBuildProject;
 
 #
-# Package that encapsulates a MSBuild project file (Visual C++ 2013 or greater)
+# Package that encapsulates a MSBuild project file (Visual C++ 2015 or greater)
 #
 # src/tools/msvc/MSBuildProject.pm
 #
@@ -405,31 +405,6 @@ EOF
 	return;
 }
 
-package VC2013Project;
-
-#
-# Package that encapsulates a Visual C++ 2013 project file
-#
-
-use strict;
-use warnings;
-use base qw(MSBuildProject);
-
-no warnings qw(redefine);    ## no critic
-
-sub new
-{
-	my $classname = shift;
-	my $self      = $classname->SUPER::_new(@_);
-	bless($self, $classname);
-
-	$self->{vcver}           = '12.00';
-	$self->{PlatformToolset} = 'v120';
-	$self->{ToolsVersion}    = '12.0';
-
-	return $self;
-}
-
 package VC2015Project;
 
 #
diff --git a/src/tools/msvc/README b/src/tools/msvc/README
index 473d6f425b..1c36925258 100644
--- a/src/tools/msvc/README
+++ b/src/tools/msvc/README
@@ -4,7 +4,7 @@ MSVC build
 ==========
 
 This directory contains the tools required to build PostgreSQL using
-Microsoft Visual Studio 2013 - 2022. This builds the whole backend, not just
+Microsoft Visual Studio 2015 - 2022. This builds the whole backend, not just
 the libpq frontend library. For more information, see the documentation
 chapter "Installation on Windows" and the description below.
 
@@ -67,7 +67,7 @@ Install.pm             module containing the install logic
 Mkvcbuild.pm           module containing the code to generate the Visual
                        Studio build (project/solution) files
 MSBuildProject.pm      module containing the code to generate MSBuild based
-                       project files (Visual Studio 2013 or greater)
+                       project files (Visual Studio 2015 or greater)
 Project.pm             module containing the common code to generate the
                        Visual Studio project files. Also provides the
                        common interface of all project file generators
@@ -88,10 +88,10 @@ config_default.pl to create the configuration arguments.
 These configuration arguments are passed over to Mkvcbuild::mkvcbuild
 (Mkvcbuild.pm) which creates the Visual Studio project and solution files.
 It does this by using VSObjectFactory::CreateSolution to create an object
-implementing the Solution interface (this could be either VS2013Solution,
+implementing the Solution interface (this could be either
 VS2015Solution, VS2017Solution, VS2019Solution or VS2022Solution, all in
 Solution.pm, depending on the user's build environment) and adding objects
-implementing the corresponding Project interface (VC2013Project,
+implementing the corresponding Project interface (
 VC2015Project, VC2017Project, VC2019Project or VC2022Project from
 MSBuildProject.pm) to it. When Solution::Save is called, the implementations
 of Solution and Project save their content in the appropriate format.
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index d30e8fcb11..a4a2c637ff 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -1218,34 +1218,6 @@ sub GetFakeConfigure
 	return $cfg;
 }
 
-package VS2013Solution;
-
-#
-# Package that encapsulates a Visual Studio 2013 solution file
-#
-
-use Carp;
-use strict;
-use warnings;
-use base qw(Solution);
-
-no warnings qw(redefine);    ## no critic
-
-sub new
-{
-	my $classname = shift;
-	my $self      = $classname->SUPER::_new(@_);
-	bless($self, $classname);
-
-	$self->{solutionFileVersion}        = '12.00';
-	$self->{vcver}                      = '12.00';
-	$self->{visualStudioName}           = 'Visual Studio 2013';
-	$self->{VisualStudioVersion}        = '12.0.21005.1';
-	$self->{MinimumVisualStudioVersion} = '10.0.40219.1';
-
-	return $self;
-}
-
 package VS2015Solution;
 
 #
diff --git a/src/tools/msvc/VSObjectFactory.pm b/src/tools/msvc/VSObjectFactory.pm
index 9f9712b793..975ccf2ee5 100644
--- a/src/tools/msvc/VSObjectFactory.pm
+++ b/src/tools/msvc/VSObjectFactory.pm
@@ -33,11 +33,7 @@ sub CreateSolution
 		$visualStudioVersion = DetermineVisualStudioVersion();
 	}
 
-	if ($visualStudioVersion eq '12.00')
-	{
-		return new VS2013Solution(@_);
-	}
-	elsif ($visualStudioVersion eq '14.00')
+	if ($visualStudioVersion eq '14.00')
 	{
 		return new VS2015Solution(@_);
 	}
@@ -87,11 +83,7 @@ sub CreateProject
 		$visualStudioVersion = DetermineVisualStudioVersion();
 	}
 
-	if ($visualStudioVersion eq '12.00')
-	{
-		return new VC2013Project(@_);
-	}
-	elsif ($visualStudioVersion eq '14.00')
+	if ($visualStudioVersion eq '14.00')
 	{
 		return new VC2015Project(@_);
 	}
-- 
2.36.1