gh-130090: Support PGO for clang-cl

PCbuild/_freeze_module.vcxproj

@@ -92,6 +92,7 @@
       <AdditionalIncludeDirectories>$(IntDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <Optimization>Disabled</Optimization>
       <WholeProgramOptimization>false</WholeProgramOptimization>
+      <AdditionalOptions Condition="$(PlatformToolset) == 'ClangCL'">%(AdditionalOptions) -fno-lto</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>

PCbuild/pyproject.props

@@ -10,6 +10,8 @@
     <Py_IntDir Condition="'$(Py_IntDir)' == ''">$(MSBuildThisFileDirectory)obj\</Py_IntDir>
     <IntDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)$(ArchName)_$(Configuration)\$(ProjectName)\</IntDir>
     <IntDir>$(IntDir.Replace(`\\`, `\`))</IntDir>
+    <ClangProfileDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)$(ArchName)_PGInstrument\__clang_profiles\</ClangProfileDir>
+    <ClangProfileDir>$(ClangProfileDir.Replace(`\\`, `\`))</ClangProfileDir>
     <!-- pyconfig.h is updated by pythoncore.vcxproj, so it's always in pythoncore's IntDir -->
     <GeneratedPyConfigDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)$(ArchName)_$(Configuration)\pythoncore\</GeneratedPyConfigDir>
     <GeneratedFrozenModulesDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)_frozen\</GeneratedFrozenModulesDir>
@@ -70,6 +72,8 @@
       <AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(PlatformToolset) == 'ClangCL'">-Wno-deprecated-non-prototype -Wno-unused-label -Wno-pointer-sign -Wno-incompatible-pointer-types-discards-qualifiers -Wno-unused-function %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(Configuration) != 'Debug' and $(PlatformToolset) == 'ClangCL'">-flto %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="$(SupportPGO) and $(Configuration) == 'PGInstrument' and $(PlatformToolset) == 'ClangCL'">-fprofile-instr-generate=$(ClangProfileDir)\default_%m.profraw %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="$(SupportPGO) and $(Configuration) == 'PGUpdate' and $(PlatformToolset) == 'ClangCL'">-fprofile-instr-use=$(ClangProfileDir)\profdata.profdata %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(MSVCHasBrokenARM64Clamping) == 'true' and $(Platform) == 'ARM64'">-d2pattern-opt-disable:-932189325 %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(MSVCHasBrokenARM64SignExtension) == 'true' and $(Platform) == 'ARM64'">-d2ssa-patterns-all- %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(GenerateSourceDependencies) == 'true'">/sourceDependencies "$(IntDir.Trim(`\`))" %(AdditionalOptions)</AdditionalOptions>
@@ -185,7 +189,7 @@ public override bool Execute() {
              Targets="CleanAll" />
   </Target>
 
-  <Target Name="CopyPGCFiles" BeforeTargets="PrepareForBuild" Condition="$(Configuration) == 'PGUpdate'">
+  <Target Name="CopyPGCFiles" BeforeTargets="PrepareForBuild" Condition="$(Configuration) == 'PGUpdate' and $(PlatformToolset) != 'ClangCL'">
     <ItemGroup>
       <_PGCFiles Include="$(OutDir)instrumented\$(TargetName)!*.pgc" />
       <_PGDFile Include="$(OutDir)instrumented\$(TargetName).pgd" />

PCbuild/pythoncore.vcxproj

@@ -716,6 +716,26 @@
     <Delete Files="$(IntDir)pyconfig.h;$(OutDir)pyconfig.h" />
   </Target>
 
+  <Target Name="EnsureClangProfileDir" BeforeTargets="PrepareForBuild"
+          Condition="$(PlatformToolset) == 'ClangCL' and $(Configuration) == 'PGInstrument' and !Exists($(ClangProfileDir))"> 
+    <MakeDir Directories="$(ClangProfileDir)" />
+  </Target>
+
+  <Target Name="CleanClangProfileDir"  BeforeTargets="PrepareForBuild"
+          Condition="$(PlatformToolset) == 'ClangCL' and $(Configuration) == 'PGInstrument' and Exists($(ClangProfileDir))">
+     <ItemGroup>
+       <FilesToDelete Include="$(ClangProfileDir)\*.*"/>
+     </ItemGroup>
+    <Delete Files="@(FilesToDelete)" TreatErrorsAsWarnings="true" />
+  </Target>
+
+  <Target Name="MergeClangProfileData" BeforeTargets="PrepareForBuild"
+          Condition="$(PlatformToolset) == 'ClangCL' and $(Configuration) == 'PGUpdate'">
+    <Message Importance="high" Text="Merging clang profile data in $(ClangProfileDir)" />
+    <Exec
+      Command='"$(LLVMInstallDir)\bin\llvm-profdata.exe" merge -output=$(ClangProfileDir)\profdata.profdata $(ClangProfileDir)\default_*.profraw' />
+  </Target>
+
   <Target Name="_GetBuildInfo" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <GIT Condition="$(GIT) == ''">git</GIT>