Enable C++20 for macOS, Linux, and Android

We have already enabled C++20 for Windows [1] including Qt6 [2]. Let's globally enable C++20 for other platforms. There must be no user observable behavior change. Closes google#783. [1]: 07d9335 [2]: 43449d0 PiperOrigin-RevId: 573458525
coooooooozy · Nov 25, 2023 · e0e1768 · e0e1768
1 parent 09b90a8
commit e0e1768
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Showing 3 changed files with 7 additions and 7 deletions.
diff --git a/src/.bazelrc b/src/.bazelrc
@@ -1,9 +1,9 @@
 # Common options
-build --cxxopt "-std=c++17"
+build --cxxopt "-std=c++20"
 build --copt "-funsigned-char"
 build --copt "-Wno-sign-compare"
 build --copt "-Wno-char-subscripts"
-build --host_cxxopt "-std=c++17"
+build --host_cxxopt "-std=c++20"
 build --host_copt "-funsigned-char"
 build --host_copt "-Wno-sign-compare"
 build --host_copt "-Wno-char-subscripts"

diff --git a/src/build_tools/build_qt.py b/src/build_tools/build_qt.py
@@ -261,6 +261,7 @@ def make_configure_options(args: argparse.Namespace) -> list[str]:
     raise ValueError(f'Only Qt6 is supported but specified {qt_version}.')
 
   qt_configure_options = ['-opensource',
+                          '-c++std', 'c++20',
                           '-silent',
                           '-no-cups',
                           '-no-dbus',
@@ -306,8 +307,7 @@ def make_configure_options(args: argparse.Namespace) -> list[str]:
           '-DCMAKE_OSX_ARCHITECTURES:STRING=' + ';'.join(macos_cpus),
       ]
   elif is_windows():
-    qt_configure_options += ['-c++std', 'c++20',
-                             '-force-debug-info',
+    qt_configure_options += ['-force-debug-info',
                              '-ltcg',  # Note: ignored in debug build
                              '-no-freetype',
                              '-no-harfbuzz',

diff --git a/src/gyp/common.gypi b/src/gyp/common.gypi
@@ -179,7 +179,7 @@
           }],
           ['compiler_target=="clang" or compiler_target=="gcc"', {
             'cflags_cc': [
-              '-std=c++17',
+              '-std=c++20',
             ],
           }],
         ],
@@ -199,7 +199,7 @@
           }],
           ['compiler_host=="clang" or compiler_host=="gcc"', {
             'cflags_cc': [
-              '-std=c++17',
+              '-std=c++20',
             ],
           }],
         ],
@@ -262,7 +262,7 @@
             '-Wno-covered-switch-default',
             '-Wno-unnamed-type-template-args',
           ],
-          'CLANG_CXX_LANGUAGE_STANDARD': 'c++17',
+          'CLANG_CXX_LANGUAGE_STANDARD': 'c++20',
           'CLANG_CXX_LIBRARY': 'libc++',
           'OTHER_CPLUSPLUSFLAGS': [
             '$(inherited)',