build: compile with C++20 support

Closes: nodejs#45402

Author: targos

common.gypi

@@ -280,7 +280,7 @@
       'VCCLCompilerTool': {
         'AdditionalOptions': [
           '/Zc:__cplusplus',
-          '-std:c++17'
+          '-std:c++20'
         ],
         'BufferSecurityCheck': 'true',
         'DebugInformationFormat': 1,          # /Z7 embed info in .obj files
@@ -399,7 +399,7 @@
       }],
       [ 'OS in "linux freebsd openbsd solaris android aix os400 cloudabi"', {
         'cflags': [ '-Wall', '-Wextra', '-Wno-unused-parameter', ],
-        'cflags_cc': [ '-fno-rtti', '-fno-exceptions', '-std=gnu++17' ],
+        'cflags_cc': [ '-fno-rtti', '-fno-exceptions', '-std=gnu++2a' ],
         'defines': [ '__STDC_FORMAT_MACROS' ],
         'ldflags': [ '-rdynamic' ],
         'target_conditions': [
@@ -539,7 +539,7 @@
           ['clang==1', {
             'xcode_settings': {
               'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
-              'CLANG_CXX_LANGUAGE_STANDARD': 'gnu++17',  # -std=gnu++17
+              'CLANG_CXX_LANGUAGE_STANDARD': 'gnu++20',  # -std=gnu++20
               'CLANG_CXX_LIBRARY': 'libc++',
             },
           }],