From 4a45d56330882a5e596e97d05ba568ec32e0603c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Provazn=C3=ADk?= <jan.provaznik@microsoft.com>
Date: Tue, 18 Jun 2024 16:25:07 +0200
Subject: [PATCH] Log Registry LongPathsEnabled in v:diagnostic (#10223)

* Add a message for LongPathsEnabled

* refactor LongPathsEnabled logic to a ternary enum

* Elaborate and comment the resource string

* translations

* add state for registry not set

* deduplicate
---
 src/Framework/NativeMethods.cs                | 57 +++++++++++++++++--
 src/MSBuild/Resources/Strings.resx            | 13 +++++
 src/MSBuild/Resources/xlf/Strings.cs.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.de.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.es.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.fr.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.it.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.ja.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.ko.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.pl.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.pt-BR.xlf   | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.ru.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.tr.xlf      | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.zh-Hans.xlf | 20 +++++++
 src/MSBuild/Resources/xlf/Strings.zh-Hant.xlf | 20 +++++++
 src/MSBuild/XMake.cs                          | 14 ++++-
 16 files changed, 337 insertions(+), 7 deletions(-)

diff --git a/src/Framework/NativeMethods.cs b/src/Framework/NativeMethods.cs
index 3cd7934c726..63888fd973b 100644
--- a/src/Framework/NativeMethods.cs
+++ b/src/Framework/NativeMethods.cs
@@ -594,25 +594,70 @@ private static void SetMaxPath()
         }
     }
 
-    internal static bool IsMaxPathLegacyWindows()
+    internal enum LongPathsStatus
+    {
+        /// <summary>
+        ///  The registry key is set to 0 or does not exist.
+        /// </summary>
+        Disabled,
+
+        /// <summary>
+        /// The registry key does not exist.
+        /// </summary>
+        Missing,
+
+        /// <summary>
+        /// The registry key is set to 1.
+        /// </summary>
+        Enabled,
+
+        /// <summary>
+        /// Not on Windows.
+        /// </summary>
+        NotApplicable,
+    }
+
+    internal static LongPathsStatus IsLongPathsEnabled()
     {
+        if (!IsWindows)
+        {
+            return LongPathsStatus.NotApplicable;
+        }
+
         try
         {
-            return IsWindows && !IsLongPathsEnabledRegistry();
+            return IsLongPathsEnabledRegistry();
         }
         catch
         {
-            return true;
+            return LongPathsStatus.Disabled;
         }
     }
 
+    internal static bool IsMaxPathLegacyWindows()
+    {
+        var longPathsStatus = IsLongPathsEnabled();
+        return longPathsStatus == LongPathsStatus.Disabled || longPathsStatus == LongPathsStatus.Missing;
+    }
+
     [SupportedOSPlatform("windows")]
-    private static bool IsLongPathsEnabledRegistry()
+    private static LongPathsStatus IsLongPathsEnabledRegistry()
     {
         using (RegistryKey fileSystemKey = Registry.LocalMachine.OpenSubKey(WINDOWS_FILE_SYSTEM_REGISTRY_KEY))
         {
-            object longPathsEnabledValue = fileSystemKey?.GetValue(WINDOWS_LONG_PATHS_ENABLED_VALUE_NAME, 0);
-            return fileSystemKey != null && Convert.ToInt32(longPathsEnabledValue) == 1;
+            object longPathsEnabledValue = fileSystemKey?.GetValue(WINDOWS_LONG_PATHS_ENABLED_VALUE_NAME, -1);
+            if (fileSystemKey != null && Convert.ToInt32(longPathsEnabledValue) == -1)
+            {
+                return LongPathsStatus.Missing;
+            }
+            else if (fileSystemKey != null && Convert.ToInt32(longPathsEnabledValue) == 1)
+            {
+                return LongPathsStatus.Enabled;
+            }
+            else
+            { 
+                return LongPathsStatus.Disabled;
+            }
         }
     }
 
diff --git a/src/MSBuild/Resources/Strings.resx b/src/MSBuild/Resources/Strings.resx
index 1129806b5c5..5dba823befb 100644
--- a/src/MSBuild/Resources/Strings.resx
+++ b/src/MSBuild/Resources/Strings.resx
@@ -1661,6 +1661,19 @@
     <value>succeeded: {0}</value>
     <comment>{0} whole number</comment>
   </data>
+  <data name="LongPaths" xml:space="preserve">
+    <value>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</value>
+    <comment>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</comment>
+  </data>
+  <data name="LongPaths_Enabled" xml:space="preserve">
+    <value>enabled</value>
+  </data>
+  <data name="LongPaths_Disabled" xml:space="preserve">
+    <value>disabled</value>
+  </data>
+  <data name="LongPaths_Missing" xml:space="preserve">
+    <value>not set</value>
+  </data>
   <!-- **** TerminalLogger strings end **** -->
     <!--
         The command line message bucket is: MSB1001 - MSB1999
diff --git a/src/MSBuild/Resources/xlf/Strings.cs.xlf b/src/MSBuild/Resources/xlf/Strings.cs.xlf
index f417ee15051..120aef2c3d9 100644
--- a/src/MSBuild/Resources/xlf/Strings.cs.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.cs.xlf
@@ -161,6 +161,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">MSBuild verze {0} pro {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.de.xlf b/src/MSBuild/Resources/xlf/Strings.de.xlf
index 50706b404dc..b428a5c1cf7 100644
--- a/src/MSBuild/Resources/xlf/Strings.de.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.de.xlf
@@ -161,6 +161,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">MSBuild-Version {0} für {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.es.xlf b/src/MSBuild/Resources/xlf/Strings.es.xlf
index e8e133d96d3..a31a8006280 100644
--- a/src/MSBuild/Resources/xlf/Strings.es.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.es.xlf
@@ -160,6 +160,26 @@ Esta marca es experimental y puede que no funcione según lo previsto.
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">Versión de MSBuild {0} para {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.fr.xlf b/src/MSBuild/Resources/xlf/Strings.fr.xlf
index bf502af7f50..15883adffc6 100644
--- a/src/MSBuild/Resources/xlf/Strings.fr.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.fr.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">Version MSBuild {0} pour {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.it.xlf b/src/MSBuild/Resources/xlf/Strings.it.xlf
index 9963ca29c49..8563e1864c8 100644
--- a/src/MSBuild/Resources/xlf/Strings.it.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.it.xlf
@@ -160,6 +160,26 @@ Questo flag è sperimentale e potrebbe non funzionare come previsto.
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">Versione di MSBuild {0} per {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.ja.xlf b/src/MSBuild/Resources/xlf/Strings.ja.xlf
index e7954c3f91c..507c861bb97 100644
--- a/src/MSBuild/Resources/xlf/Strings.ja.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.ja.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">MSBuild のバージョン {0} ({1})</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.ko.xlf b/src/MSBuild/Resources/xlf/Strings.ko.xlf
index f995ca421bc..7a6d0d02cc4 100644
--- a/src/MSBuild/Resources/xlf/Strings.ko.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.ko.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">msbuild 버전 {0}({1}용)</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.pl.xlf b/src/MSBuild/Resources/xlf/Strings.pl.xlf
index 6d1956125cd..f51befa72f5 100644
--- a/src/MSBuild/Resources/xlf/Strings.pl.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.pl.xlf
@@ -160,6 +160,26 @@ Ta flaga jest eksperymentalna i może nie działać zgodnie z oczekiwaniami.
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">Wersja programu MSBuild {0} dla {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.pt-BR.xlf b/src/MSBuild/Resources/xlf/Strings.pt-BR.xlf
index 4e3266b9533..aa4fbc6c949 100644
--- a/src/MSBuild/Resources/xlf/Strings.pt-BR.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.pt-BR.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">Versão do MSBuild {0} para {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.ru.xlf b/src/MSBuild/Resources/xlf/Strings.ru.xlf
index 2c27bb72d73..cae465db562 100644
--- a/src/MSBuild/Resources/xlf/Strings.ru.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.ru.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">Версия MSBuild {0} для {1}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.tr.xlf b/src/MSBuild/Resources/xlf/Strings.tr.xlf
index 86fc2093ac5..d74d39651ba 100644
--- a/src/MSBuild/Resources/xlf/Strings.tr.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.tr.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">{1} için MSBuild sürüm {0}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.zh-Hans.xlf b/src/MSBuild/Resources/xlf/Strings.zh-Hans.xlf
index 78c661b0857..74973d7b85a 100644
--- a/src/MSBuild/Resources/xlf/Strings.zh-Hans.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.zh-Hans.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">适用于 {1} MSBuild 版本 {0}</target>
diff --git a/src/MSBuild/Resources/xlf/Strings.zh-Hant.xlf b/src/MSBuild/Resources/xlf/Strings.zh-Hant.xlf
index 29c76948500..7f159572f6e 100644
--- a/src/MSBuild/Resources/xlf/Strings.zh-Hant.xlf
+++ b/src/MSBuild/Resources/xlf/Strings.zh-Hant.xlf
@@ -160,6 +160,26 @@
       LOCALIZATION: The prefix "MSBUILD : error MSBxxxx:" should not be localized.
     </note>
       </trans-unit>
+      <trans-unit id="LongPaths">
+        <source>Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</source>
+        <target state="new">Based on the Windows registry key LongPathsEnabled, the LongPaths feature is {0}.</target>
+        <note>"Windows" is the OS, "LongPathsEnabled" should not be localized, and {0} will be "enabled"/"disabled"/"not set"</note>
+      </trans-unit>
+      <trans-unit id="LongPaths_Disabled">
+        <source>disabled</source>
+        <target state="new">disabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Enabled">
+        <source>enabled</source>
+        <target state="new">enabled</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="LongPaths_Missing">
+        <source>not set</source>
+        <target state="new">not set</target>
+        <note />
+      </trans-unit>
       <trans-unit id="MSBuildVersionMessage">
         <source>MSBuild version {0} for {1}</source>
         <target state="translated">{1} 的 MSBuild 版本 {0}</target>
diff --git a/src/MSBuild/XMake.cs b/src/MSBuild/XMake.cs
index 088d2c00179..2f1d6142241 100644
--- a/src/MSBuild/XMake.cs
+++ b/src/MSBuild/XMake.cs
@@ -1749,6 +1749,18 @@ private static bool PrintTargets(string projectFile, string toolsVersion, Dictio
                     MessageImportance.Low),
             };
 
+            NativeMethodsShared.LongPathsStatus longPaths = NativeMethodsShared.IsLongPathsEnabled();
+            if (longPaths != NativeMethodsShared.LongPathsStatus.NotApplicable)
+            {
+                messages.Add(
+                    new BuildManager.DeferredBuildMessage(
+                        ResourceUtilities.FormatResourceStringIgnoreCodeAndKeyword(
+                            "LongPaths",
+                            ResourceUtilities.FormatResourceStringIgnoreCodeAndKeyword(
+                                "LongPaths_" + longPaths.ToString())),
+                        MessageImportance.Low));
+            }
+
             if (Traits.Instance.DebugEngine)
             {
                 messages.Add(
@@ -3013,7 +3025,7 @@ private static string GetProjectDirectory(string[] projectSwitchParameters)
         private static bool CheckAndGatherProjectAutoResponseFile(CommandLineSwitches switchesFromAutoResponseFile, CommandLineSwitches commandLineSwitches, bool recursing, string commandLine)
         {
             bool found = false;
-           
+
             var projectDirectory = GetProjectDirectory(commandLineSwitches[CommandLineSwitches.ParameterizedSwitch.Project]);
 
             if (!recursing && !commandLineSwitches[CommandLineSwitches.ParameterlessSwitch.NoAutoResponse])