Made preprocessor with MSVC behave correctly.

SConscript

@@ -1019,7 +1019,8 @@ if env['COMPILER_FAMILY'] == 'gcc' or env['COMPILER_FAMILY'] == 'clang':
         # no-gnu-anonymous-struct - we don't care
         # no-missing-field-initializers - useful in some cases, annoying in most
         # no-ambiguous-reversed-operator - should be quite useful, but we get a false positive, apparently?
-        env.Append(CCFLAGS = ['-Wno-gnu-anonymous-struct', '-Wno-missing-field-initializers', '-Wno-ambiguous-reversed-operator'])
+        # no-parentheses-equality - false positive for fold expressions and doesn't seem to useful anyway
+        env.Append(CCFLAGS = ['-Wno-gnu-anonymous-struct', '-Wno-missing-field-initializers', '-Wno-ambiguous-reversed-operator', '-Wno-parentheses-equality'])
         env.Append(CXXFLAGS = ['-fexperimental-library']) # enable std::jthread
     if build_type == 'debug':
         env.Append(CCFLAGS = ['-g', '-O0'], CPPDEFINES = ['_GLIBCXX_DEBUG'])
@@ -1055,7 +1056,7 @@ elif env['COMPILER_FAMILY'] == 'cl':
     # C4251: missing dll-interface of some std types, yaml-cpp doesn't compile with this enabled
     # C4275: same as above
     env.Append(CCFLAGS = ['/W4', '/WX', '/wd4201', '/wd4127', '/wd4702', '/wd4251', '/wd4275', '/bigobj', '/vmg',
-                          f'/std:{cxx_version_name}', '/permissive-', '/FS', '/Zc:char8_t', '/utf-8'])
+                          f'/std:{cxx_version_name}', '/permissive-', '/FS', '/Zc:char8_t', '/utf-8', '/Zc:preprocessor'])
     env.Append(CPPDEFINES = ['_CRT_SECURE_NO_WARNINGS']) # I'd like to not use MSVC specific versions of functions because they are "safer" ...
     env.Append(DEPS_CXXFLAGS = ['/Zc:char8_t', '/utf-8', '/vmg'])
     if env['CXX_NO_EXCEPTIONS']: