From 89440bb60196550660d1c5f293142ee0ef97c971 Mon Sep 17 00:00:00 2001
From: Yasumasa Suenaga <yasuenag@gmail.com>
Date: Wed, 12 Nov 2025 21:42:13 +0900
Subject: [PATCH] 8371967: Add Visual Studio 2026 to build toolchain for
 Windows

---
 doc/building.html                    |  2 +-
 doc/building.md                      |  2 +-
 make/autoconf/toolchain_microsoft.m4 | 17 ++++++++++++++++-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/doc/building.html b/doc/building.html
index 99eb3e0c473f1..19313ebf43a82 100644
--- a/doc/building.html
+++ b/doc/building.html
@@ -668,7 +668,7 @@ <h3 id="microsoft-visual-studio">Microsoft Visual Studio</h3>
 (Note that this version is often presented as "MSVC 14.28", and reported
 by cl.exe as 19.28.) Older versions will not be accepted by
 <code>configure</code> and will not work. The maximum accepted version
-of Visual Studio is 2022.</p>
+of Visual Studio is 2026.</p>
 <p>If you have multiple versions of Visual Studio installed,
 <code>configure</code> will by default pick the latest. You can request
 a specific version to be used by setting
diff --git a/doc/building.md b/doc/building.md
index 047255d184803..1fbd395a9d130 100644
--- a/doc/building.md
+++ b/doc/building.md
@@ -468,7 +468,7 @@ available for this update.
 The minimum accepted version is Visual Studio 2019 version 16.8. (Note that
 this version is often presented as "MSVC 14.28", and reported by cl.exe as
 19.28.) Older versions will not be accepted by `configure` and will not work.
-The maximum accepted version of Visual Studio is 2022.
+The maximum accepted version of Visual Studio is 2026.
 
 If you have multiple versions of Visual Studio installed, `configure` will by
 default pick the latest. You can request a specific version to be used by
diff --git a/make/autoconf/toolchain_microsoft.m4 b/make/autoconf/toolchain_microsoft.m4
index 17ad2666b3ab8..f577cf1a2a1d6 100644
--- a/make/autoconf/toolchain_microsoft.m4
+++ b/make/autoconf/toolchain_microsoft.m4
@@ -25,7 +25,7 @@
 
 ################################################################################
 # The order of these defines the priority by which we try to find them.
-VALID_VS_VERSIONS="2022 2019"
+VALID_VS_VERSIONS="2022 2019 2026"
 
 VS_DESCRIPTION_2019="Microsoft Visual Studio 2019"
 VS_VERSION_INTERNAL_2019=142
@@ -57,6 +57,21 @@ VS_SDK_PLATFORM_NAME_2022=
 VS_SUPPORTED_2022=true
 VS_TOOLSET_SUPPORTED_2022=true
 
+VS_DESCRIPTION_2026="Microsoft Visual Studio 2026"
+VS_VERSION_INTERNAL_2026=145
+VS_MSVCR_2026=vcruntime140.dll
+VS_VCRUNTIME_1_2026=vcruntime140_1.dll
+VS_MSVCP_2026=msvcp140.dll
+VS_ENVVAR_2026="VS180COMNTOOLS"
+VS_USE_UCRT_2026="true"
+VS_VS_INSTALLDIR_2026="Microsoft Visual Studio/18"
+VS_EDITIONS_2026="BuildTools Community Professional Enterprise"
+VS_SDK_INSTALLDIR_2026=
+VS_VS_PLATFORM_NAME_2026="v145"
+VS_SDK_PLATFORM_NAME_2026=
+VS_SUPPORTED_2026=true
+VS_TOOLSET_SUPPORTED_2026=true
+
 ################################################################################
 
 AC_DEFUN([TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT],