ICU-21107 Specify language standard versions C11 & C++17 also for MSVC.

There were until now no versions specified at all, relying on the default (or commandline overrides) to be sufficiently recent.
unicode-org · Jan 16, 2024 · 078b88a · 078b88a
1 parent 214ae60
commit 078b88a
Show file tree

Hide file tree

Showing 76 changed files with 319 additions and 19 deletions.
diff --git a/icu4c/source/common/common.vcxproj b/icu4c/source/common/common.vcxproj
@@ -34,6 +34,8 @@
       <TypeLibraryName>$(OutDir)\icuuc.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <PreprocessorDefinitions>U_ATTRIBUTE_DEPRECATED=;U_COMMON_IMPLEMENTATION;U_PLATFORM_USES_ONLY_WIN32_API=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableLanguageExtensions>false</DisableLanguageExtensions>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/common/common_uwp.vcxproj b/icu4c/source/common/common_uwp.vcxproj
@@ -72,6 +72,8 @@
       <TypeLibraryName>$(OutDir)\icuuc.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\include;..\common;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <!-- U_DISABLE_RENAMING -->
       <!-- U_HIDE_DRAFT_API & U_HIDE_DEPRECATED_API -->

diff --git a/icu4c/source/extra/uconv/uconv.vcxproj b/icu4c/source/extra/uconv/uconv.vcxproj
@@ -34,9 +34,11 @@
       <TypeLibraryName>$(OutDir)\uconv.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <WarningLevel>Level3</WarningLevel>
       <CompileAs>Default</CompileAs>
-      <DisableLanguageExtensions>true</DisableLanguageExtensions>
+      <DisableLanguageExtensions>false</DisableLanguageExtensions>
       <AdditionalIncludeDirectories>..\..\..\include;..\..\common;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>UCONVMSG_LINK;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PrecompiledHeaderOutputFile>$(OutDir)\uconv.pch</PrecompiledHeaderOutputFile>

diff --git a/icu4c/source/i18n/i18n.vcxproj b/icu4c/source/i18n/i18n.vcxproj
@@ -34,6 +34,8 @@
       <TypeLibraryName>$(OutDir)\icuin.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <PreprocessorDefinitions>U_ATTRIBUTE_DEPRECATED=;U_I18N_IMPLEMENTATION;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableLanguageExtensions>false</DisableLanguageExtensions>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/i18n/i18n_uwp.vcxproj b/icu4c/source/i18n/i18n_uwp.vcxproj
@@ -70,6 +70,8 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\include;..\common;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <!-- U_DISABLE_RENAMING -->
       <!-- U_HIDE_DRAFT_API & U_HIDE_DEPRECATED_API -->

diff --git a/icu4c/source/io/io.vcxproj b/icu4c/source/io/io.vcxproj
@@ -34,6 +34,8 @@
       <TypeLibraryName>$(OutDir)\icuio.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\include;..\common;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>U_IO_IMPLEMENTATION;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableLanguageExtensions>false</DisableLanguageExtensions>

diff --git a/icu4c/source/layoutex/layoutex.vcxproj b/icu4c/source/layoutex/layoutex.vcxproj
@@ -34,6 +34,8 @@
     <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\include;..\common;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>U_LAYOUTEX_IMPLEMENTATION;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/samples/break/break.vcxproj b/icu4c/source/samples/break/break.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
     </ClCompile>

diff --git a/icu4c/source/samples/cal/cal.vcxproj b/icu4c/source/samples/cal/cal.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
       <DisableLanguageExtensions>false</DisableLanguageExtensions>

diff --git a/icu4c/source/samples/case/case.vcxproj b/icu4c/source/samples/case/case.vcxproj
@@ -33,9 +33,11 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
-      <DisableLanguageExtensions>true</DisableLanguageExtensions>
+      <DisableLanguageExtensions>false</DisableLanguageExtensions>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">

diff --git a/icu4c/source/samples/citer/citer.vcxproj b/icu4c/source/samples/citer/citer.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.\x64\Release\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>

diff --git a/icu4c/source/samples/coll/coll.vcxproj b/icu4c/source/samples/coll/coll.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.\x64\Debug\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/coll.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/csdet/csdet.vcxproj b/icu4c/source/samples/csdet/csdet.vcxproj
@@ -31,6 +31,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.\x64\Release\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <AdditionalIncludeDirectories>../../../include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>

diff --git a/icu4c/source/samples/date/date.vcxproj b/icu4c/source/samples/date/date.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.\x64\Debug\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/date.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/datefmt/datefmt.vcxproj b/icu4c/source/samples/datefmt/datefmt.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.\x64\Release\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Debug/datefmt.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/dtitvfmtsample/dtitvfmtsample.vcxproj b/icu4c/source/samples/dtitvfmtsample/dtitvfmtsample.vcxproj
@@ -65,6 +65,12 @@
     <IntDir>.\x64\Release\</IntDir>
     <TargetName>$(ProjectName)</TargetName>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/samples/dtptngsample/dtptngsample.vcxproj b/icu4c/source/samples/dtptngsample/dtptngsample.vcxproj
@@ -65,6 +65,12 @@
     <IntDir>.\x64\Release\</IntDir>
     <TargetName>$(ProjectName)</TargetName>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/samples/layout/layout.vcxproj b/icu4c/source/samples/layout/layout.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.\x64\Debug\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/layout.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/legacy/legacy.vcxproj b/icu4c/source/samples/legacy/legacy.vcxproj
@@ -66,6 +66,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.\x64\Debug\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/legacy.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/msgfmt/msgfmt.vcxproj b/icu4c/source/samples/msgfmt/msgfmt.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.\x64\Debug\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/msgfmt.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/numfmt/numfmt.vcxproj b/icu4c/source/samples/numfmt/numfmt.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.\x64\Release\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Debug/numfmt.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/plurfmtsample/plurfmtsample.vcxproj b/icu4c/source/samples/plurfmtsample/plurfmtsample.vcxproj
@@ -64,6 +64,12 @@
     <IntDir>.\x64\Release\</IntDir>
     <TargetName>$(ProjectName)</TargetName>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/samples/props/props.vcxproj b/icu4c/source/samples/props/props.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.\x64\Debug\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/props.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/strsrch/strsrch.vcxproj b/icu4c/source/samples/strsrch/strsrch.vcxproj
@@ -30,6 +30,12 @@
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.\x64\Release\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Debug/strsrch.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/translit/translit.vcxproj b/icu4c/source/samples/translit/translit.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
     </ClCompile>

diff --git a/icu4c/source/samples/uciter8/uciter8.vcxproj b/icu4c/source/samples/uciter8/uciter8.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
     </ClCompile>

diff --git a/icu4c/source/samples/ucnv/ucnv.vcxproj b/icu4c/source/samples/ucnv/ucnv.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
     </ClCompile>

diff --git a/icu4c/source/samples/udata/reader.vcxproj b/icu4c/source/samples/udata/reader.vcxproj
@@ -35,6 +35,12 @@
     <IntDir>.\x64\Release\</IntDir>
     <TargetName>$(ProjectName)</TargetName>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Midl>
       <TypeLibraryName>.\reader_Win32_Debug/reader.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/udata/writer.vcxproj b/icu4c/source/samples/udata/writer.vcxproj
@@ -35,6 +35,12 @@
     <IntDir>.\x64\Release\</IntDir>
     <TargetName>$(ProjectName)</TargetName>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Debug/writer.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/ufortune/ufortune.vcxproj b/icu4c/source/samples/ufortune/ufortune.vcxproj
@@ -32,6 +32,8 @@
       <TypeLibraryName>$(OutDir)\ufortune.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <WarningLevel>Level3</WarningLevel>

diff --git a/icu4c/source/samples/ugrep/ugrep.vcxproj b/icu4c/source/samples/ugrep/ugrep.vcxproj
@@ -26,6 +26,12 @@
     <LinkIncremental Condition="'$(Configuration)'=='Debug'">true</LinkIncremental>
     <LinkIncremental Condition="'$(Configuration)'=='Release'">false</LinkIncremental>
   </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
       <TypeLibraryName>.\x86\Release/ugrep.tlb</TypeLibraryName>

diff --git a/icu4c/source/samples/uresb/uresb.vcxproj b/icu4c/source/samples/uresb/uresb.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>../../../include;../../tools/toolutil;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
     </ClCompile>

diff --git a/icu4c/source/samples/ustring/ustring.vcxproj b/icu4c/source/samples/ustring/ustring.vcxproj
@@ -33,6 +33,8 @@
   <!-- Options that are common to *all* project configurations -->
   <ItemDefinitionGroup>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>Level3</WarningLevel>
     </ClCompile>

diff --git a/icu4c/source/stubdata/stubdata.vcxproj b/icu4c/source/stubdata/stubdata.vcxproj
@@ -35,9 +35,11 @@
       <TypeLibraryName>$(OutDir)\icudt.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <AdditionalIncludeDirectories>..\common;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>STUBDATA_BUILD;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <DisableLanguageExtensions>true</DisableLanguageExtensions>
+      <DisableLanguageExtensions>false</DisableLanguageExtensions>
       <WarningLevel>Level3</WarningLevel>
       <CompileAs>Default</CompileAs>
       <PrecompiledHeaderOutputFile>$(OutDir)/icudt.pch</PrecompiledHeaderOutputFile>

diff --git a/icu4c/source/test/cintltst/cintltst.vcxproj b/icu4c/source/test/cintltst/cintltst.vcxproj
@@ -32,6 +32,8 @@
       <TypeLibraryName>$(OutDir)\cintltst.tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard_C>stdc11</LanguageStandard_C>
       <WarningLevel>Level3</WarningLevel>
       <CompileAs>Default</CompileAs>
       <DisableLanguageExtensions>false</DisableLanguageExtensions>