Allow c++23 in gcc-11.

Author: bredelings

mesonbuild/compilers/cpp.py

@@ -421,7 +421,7 @@ def get_options(self) -> 'MutableKeyedOptionDictType':
             'c++2a', 'c++20', 'gnu++03', 'gnu++11', 'gnu++14', 'gnu++17',
             'gnu++1z', 'gnu++2a', 'gnu++20',
         ]
-        if version_compare(self.version, '>=12.2.0'):
+        if version_compare(self.version, '>=11.0.0'):
             cppstd_choices.append('c++23')
             cppstd_choices.append('gnu++23')
         opts[key].choices = cppstd_choices

unittests/linuxliketests.py

@@ -519,10 +519,10 @@ def _test_stds_impl(self, testdir: str, compiler: 'Compiler') -> None:
                      compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=10.0.0'))
         has_cpp2b = (compiler.get_id() not in {'clang', 'gcc'} or
                      compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=12.0.0', None) or
-                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=12.2.0'))
+                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=11.0.0'))
         has_cpp23 = (compiler.get_id() not in {'clang', 'gcc'} or
                      compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=17.0.0', None) or
-                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=12.2.0'))
+                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=11.0.0'))
         has_c18 = (compiler.get_id() not in {'clang', 'gcc'} or
                    compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=8.0.0', '>=11.0') or
                    compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=8.0.0'))