fix build on clangcl, except for v8 assembly (#9)

1. To avoid many warnings, this PR declares the C and C++ standards separately.
2. This PR extends gyp so that we can build with AVX-512. Nevertheless, getting runtime dispatching with ClangCl through Visual Studio is challenging, so we disable it. It only affects one component of zip, so the effect on runtime performance should be negligible. Note that other dependencies such as simdutf do not need to this build support for runtime dispatching (so you still get AVX2, AVX-512 support in these dependencies).

common.gypi

@@ -285,10 +285,13 @@
     ],
     'msvs_settings': {
       'VCCLCompilerTool': {
+        # Node has C and C++ dependencies: we want to specify the standards
+        # independently. Recent versions of Visual Studio support C11 and C17
+        # https://learn.microsoft.com/en-us/cpp/overview/install-c17-support?view=msvc-170
+        'LanguageStandard': 'stdcpp20',
+        'LanguageStandard_C': 'stdc11',
         'AdditionalOptions': [
           '/Zc:__cplusplus',
-          # The following option enables c++20 on Windows. This is needed for V8 v12.4+
-          '-std:c++20',
           # The following option reduces the "error C1060: compiler is out of heap space"
           '/Zm2000',
         ],

deps/zlib/zlib.gyp

@@ -17,12 +17,11 @@
           'type': 'static_library',
           'conditions': [
             ['target_arch in "ia32 x64" and OS!="ios"', {
-              'defines': [ 'ADLER32_SIMD_SSSE3' ],
               'conditions': [
                 ['OS=="win"', {
                   'defines': [ 'X86_WINDOWS' ],
                 },{
-                  'defines': [ 'X86_NOT_WINDOWS' ],
+                  'defines': [ 'X86_NOT_WINDOWS', 'ADLER32_SIMD_SSSE3' ],
                 }],
                 ['OS!="win" or llvm_version!="0.0"', {
                   'cflags': [ '-mssse3' ],
@@ -40,12 +39,11 @@
           'direct_dependent_settings': {
             'conditions': [
               ['target_arch in "ia32 x64" and OS!="ios"', {
-                'defines': [ 'ADLER32_SIMD_SSSE3' ],
                 'conditions': [
                   ['OS=="win"', {
                     'defines': [ 'X86_WINDOWS' ],
                   },{
-                    'defines': [ 'X86_NOT_WINDOWS' ],
+                    'defines': [ 'X86_NOT_WINDOWS', 'ADLER32_SIMD_SSSE3' ],
                   }],
                 ],
               }],

tools/gyp/pylib/gyp/MSVSSettings.py

@@ -579,6 +579,8 @@ def _ValidateSettings(validators, settings, stderr):
 # Options that have the same name in MSVS and MSBuild
 _Same(_compile, "AdditionalIncludeDirectories", _folder_list)  # /I
 _Same(_compile, "AdditionalOptions", _string_list)
+_Same(_compile, "LanguageStandard", _string)
+_Same(_compile, "LanguageStandard_C", _string)
 _Same(_compile, "AdditionalUsingDirectories", _folder_list)  # /AI
 _Same(_compile, "AssemblerListingLocation", _file_name)  # /Fa
 _Same(_compile, "BrowseInformationFile", _file_name)
@@ -675,6 +677,7 @@ def _ValidateSettings(validators, settings, stderr):
             "NoExtensions",  # /arch:IA32 (vs2012+)
             # This one only exists in the new msbuild format.
             "AdvancedVectorExtensions2",  # /arch:AVX2 (vs2013r2+)
+            "AdvancedVectorExtensions512",  #  (vs2019+)
         ]
     ),
 )

tools/gyp/pylib/gyp/msvs_emulation.py

@@ -531,7 +531,7 @@ def GetCflags(self, config):
         cl("AdditionalOptions", prefix="")
         cl(
             "EnableEnhancedInstructionSet",
-            map={"1": "SSE", "2": "SSE2", "3": "AVX", "4": "IA32", "5": "AVX2"},
+            map={"1": "SSE", "2": "SSE2", "3": "AVX", "4": "IA32", "5": "AVX2", "6": "AVX512"},
             prefix="/arch:",
         )
         cflags.extend(