Add C++17 flags to GCC and Clang.

mesonbuild/compilers/cpp.py

@@ -76,8 +76,8 @@ class ClangCPPCompiler(ClangCompiler, CPPCompiler):
 
     def get_options(self):
         return {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                    ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++1z',
-                                                     'gnu++11', 'gnu++14', 'gnu++1z'],
+                                                    ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++17', 'c++1z',
+                                                     'gnu++11', 'gnu++14', 'gnu++17', 'gnu++1z'],
                                                     'none')}
 
     def get_option_compile_args(self, options):
@@ -102,8 +102,8 @@ class GnuCPPCompiler(GnuCompiler, CPPCompiler):
 
     def get_options(self):
         opts = {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                    ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++1z',
-                                                     'gnu++03', 'gnu++11', 'gnu++14', 'gnu++1z'],
+                                                    ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++17', 'c++1z',
+                                                     'gnu++03', 'gnu++11', 'gnu++14', 'gnu++17', 'gnu++1z'],
                                                     'none'),
                 'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
                                                            'STL debug mode',

run_unittests.py

@@ -35,7 +35,7 @@ import mesonbuild.mesonlib
 import mesonbuild.coredata
 from mesonbuild.interpreter import ObjectHolder
 from mesonbuild.mesonlib import is_linux, is_windows, is_osx, is_cygwin, windows_proof_rmtree
-from mesonbuild.mesonlib import python_command, meson_command
+from mesonbuild.mesonlib import python_command, meson_command, version_compare
 from mesonbuild.environment import Environment
 from mesonbuild.dependencies import DependencyException
 from mesonbuild.dependencies import PkgConfigDependency, ExternalProgram
@@ -2048,6 +2048,8 @@ class LinuxlikeTests(BasePlatformTests):
         # Check that all the listed -std=xxx options for this compiler work
         # just fine when used
         for v in compiler.get_options()[lang_std].choices:
+            if compiler.get_id() == 'clang' and version_compare(compiler.version, '<5.0.0') and '17' in v:
+                continue
             std_opt = '{}={}'.format(lang_std, v)
             self.init(testdir, ['-D' + std_opt])
             cmd = self.get_compdb()[0]['command']