Index: qmake/generators/win32/msvc_objectmodel.cpp
<+>UTF-8
===================================================================
diff --git a/qmake/generators/win32/msvc_objectmodel.cpp b/qmake/generators/win32/msvc_objectmodel.cpp
--- a/qmake/generators/win32/msvc_objectmodel.cpp	(revision 98e7a6ae2cc1c44ef7ef801ad3149f7a49b3c8fc)
+++ b/qmake/generators/win32/msvc_objectmodel.cpp	(date 1607580880799)
@@ -1147,11 +1147,15 @@
             ShowIncludes = _True;
             break;
         }
-        if (strlen(option) > 8 && second == 't' && third == 'd') {
-            const QString version = option + 8;
-            static const QStringList knownVersions = { "14", "17", "latest" };
-            if (knownVersions.contains(version)) {
-                LanguageStandard = "stdcpp" + version;
+        if (strlen(option) > 5 && second == 't' && third == 'd') {
+            const QString version = option + 5;
+            static const QStringList knownCppVersions = { "c++14", "c++17", "c++latest" };
+            static const QStringList knownCVersions = { "c11", "c17" };
+            if (knownCppVersions.contains(version)) {
+                LanguageStandard = "stdcpp" + version.mid(3);
+                break;
+            } else if (config->CompilerVersion >= NET2019 && knownCVersions.contains(version)) {
+                LanguageStandard_C = "std" + version;
                 break;
             }
         }
Index: qmake/generators/win32/msbuild_objectmodel.cpp
<+>UTF-8
===================================================================
diff --git a/qmake/generators/win32/msbuild_objectmodel.cpp b/qmake/generators/win32/msbuild_objectmodel.cpp
--- a/qmake/generators/win32/msbuild_objectmodel.cpp	(revision 98e7a6ae2cc1c44ef7ef801ad3149f7a49b3c8fc)
+++ b/qmake/generators/win32/msbuild_objectmodel.cpp	(date 1607567151447)
@@ -144,6 +144,7 @@
 const char _KeyContainer[]                      = "KeyContainer";
 const char _KeyFile[]                           = "KeyFile";
 const char _LanguageStandard[]                  = "LanguageStandard";
+const char _LanguageStandard_C[]                = "LanguageStandard_C";
 const char _LargeAddressAware[]                 = "LargeAddressAware";
 const char _LinkDLL[]                           = "LinkDLL";
 const char _LinkErrorReporting[]                = "LinkErrorReporting";
@@ -1483,6 +1484,7 @@
             << attrTagT(_MinimalRebuild, tool.MinimalRebuild)
             << attrTagT(_MultiProcessorCompilation, tool.MultiProcessorCompilation)
             << attrTagS(_LanguageStandard, tool.LanguageStandard)
+            << attrTagS(_LanguageStandard_C, tool.LanguageStandard_C)
             << attrTagS(_ObjectFileName, tool.ObjectFile)
             << attrTagT(_OmitDefaultLibName, tool.OmitDefaultLibName)
             << attrTagT(_OmitFramePointers, tool.OmitFramePointers)
Index: qmake/generators/win32/msvc_objectmodel.h
<+>UTF-8
===================================================================
diff --git a/qmake/generators/win32/msvc_objectmodel.h b/qmake/generators/win32/msvc_objectmodel.h
--- a/qmake/generators/win32/msvc_objectmodel.h	(revision 98e7a6ae2cc1c44ef7ef801ad3149f7a49b3c8fc)
+++ b/qmake/generators/win32/msvc_objectmodel.h	(date 1607567151427)
@@ -527,6 +527,7 @@
     inlineExpansionOption   InlineFunctionExpansion;
     triState                KeepComments;
     QString                 LanguageStandard;
+    QString                 LanguageStandard_C;
     triState                MinimalRebuild;
     QString                 ObjectFile;
     triState                OmitDefaultLibName;