Changes by Chris to support clang-cl

Co-Authored-By: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>

Author: Fidget-Spinner

PCbuild/pythoncore.vcxproj

@@ -108,7 +108,6 @@
       <PreprocessorDefinitions Condition="'$(UseJIT)' == 'true'">_Py_JIT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(UseTIER2)' != '' and '$(UseTIER2)' != '0'">_Py_TIER2=$(UseTIER2);%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(UseTailCallInterp)' == 'true'">Py_TAIL_CALL_INTERP=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalOptions Condition="'$(UseTailCallInterp)' == 'true'">/std:clatest %(AdditionalOptions)</AdditionalOptions>
       <PreprocessorDefinitions Condition="'$(WITH_COMPUTED_GOTOS)' != ''">HAVE_COMPUTED_GOTOS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(DisableRemoteDebug)' != 'true'">Py_REMOTE_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
@@ -591,7 +590,9 @@
     <ClCompile Include="..\Python\bltinmodule.c" />
     <ClCompile Include="..\Python\bootstrap_hash.c" />
     <ClCompile Include="..\Python\brc.c" />
-    <ClCompile Include="..\Python\ceval.c" />
+    <ClCompile Include="..\Python\ceval.c">
+      <AdditionalOptions Condition="'$(UseTailCallInterp)' == 'true' and $(PlatformToolset) != 'ClangCL'">/std:clatest %(AdditionalOptions)</AdditionalOptions>
+    </ClCompile>
     <ClCompile Include="..\Python\codecs.c" />
     <ClCompile Include="..\Python\codegen.c" />
     <ClCompile Include="..\Python\compile.c" />

Python/ceval_macros.h

@@ -79,7 +79,7 @@
 #endif
 
 #if Py_TAIL_CALL_INTERP
-#   ifdef _MSC_VER
+#   if defined(_MSC_VER) && !defined(__clang__)
 #      define Py_MUSTTAIL [[msvc::musttail]]
 #      define Py_PRESERVE_NONE_CC __preserve_none
 #   else