icc: Fix C/C++ std options and add a unit test for them

Compiler versions 15.0 and later actually ignore invalid values for the
-std= option unless `-diag-error 10159` is passed, so we need to put
that in the unit test.

I have tested this with versions 14.0.3, 15.0.6, 16.0.4, and 17.0.1.
Would be great if someone could test with 13.x.y

mesonbuild/compilers.py

@@ -2448,9 +2448,12 @@ class IntelCCompiler(IntelCompiler, CCompiler):
                           '3': ['-Wall', '-w3', '-diag-disable:remark', '-Wpedantic', '-Wextra', '-Wpch-messages']}
 
     def get_options(self):
+        c_stds = ['c89', 'c99']
+        g_stds = ['gnu89', 'gnu99']
+        if mesonlib.version_compare(self.version, '>=16.0.0'):
+            c_stds += ['c11']
         opts = {'c_std': coredata.UserComboOption('c_std', 'C language standard to use',
-                                                  ['none', 'c89', 'c99',
-                                                   'gnu89', 'gnu99'],
+                                                  ['none'] + c_stds + g_stds,
                                                   'none')}
         return opts
 
@@ -2469,6 +2472,7 @@ class IntelCCompiler(IntelCompiler, CCompiler):
 
 
 class IntelCPPCompiler(IntelCompiler, CPPCompiler):
+
     def __init__(self, exelist, version, icc_type, is_cross, exe_wrap):
         CPPCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
         IntelCompiler.__init__(self, icc_type)
@@ -2477,22 +2481,21 @@ class IntelCPPCompiler(IntelCompiler, CPPCompiler):
                           '3': ['-Wall', '-w3', '-diag-disable:remark', '-Wpedantic', '-Wextra', '-Wpch-messages', '-Wnon-virtual-dtor']}
 
     def get_options(self):
+        c_stds = []
+        g_stds = ['gnu++98']
+        if mesonlib.version_compare(self.version, '>=15.0.0'):
+            c_stds += ['c++11', 'c++14']
+            g_stds += ['gnu++11']
+        if mesonlib.version_compare(self.version, '>=16.0.0'):
+            c_stds += ['c++17']
         if mesonlib.version_compare(self.version, '>=17.0.0'):
-            opts = {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                        ['none', 'c++11', 'c++0x', 'c++14',
-                                                         'gnu++98', 'gnu++11', 'gnu++0x', 'gnu++14'],
-                                                        'none'),
-                    'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
-                                                               'STL debug mode',
-                                                               False)}
-        else:
-            opts = {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                        ['none', 'c++03', 'c++11', 'c++0x',
-                                                         'gnu++98', 'gnu++03', 'gnu++11', 'gnu++0x'],
-                                                        'none'),
-                    'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
-                                                               'STL debug mode',
-                                                               False)}
+            g_stds += ['gnu++14']
+        opts = {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
+                                                    ['none'] + c_stds + g_stds,
+                                                    'none'),
+                'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
+                                                           'STL debug mode',
+                                                           False)}
         return opts
 
     def get_option_compile_args(self, options):

run_unittests.py

@@ -19,7 +19,7 @@ import re, json
 import tempfile
 from glob import glob
 import mesonbuild.environment
-from mesonbuild.environment import detect_ninja
+from mesonbuild.environment import detect_ninja, Environment
 from mesonbuild.dependencies import PkgConfigDependency
 
 def get_soname(fname):
@@ -33,6 +33,12 @@ def get_soname(fname):
             return m.group(1)
     raise RuntimeError('Could not determine soname:\n\n' + raw_out)
 
+def get_fake_options():
+    import argparse
+    opts = argparse.Namespace()
+    opts.cross_file = None
+    return opts
+
 class FakeEnvironment(object):
     def __init__(self):
         self.cross_info = None
@@ -81,11 +87,13 @@ class LinuxlikeTests(unittest.TestCase):
     def _run(self, command):
         self.output += subprocess.check_output(command, env=os.environ.copy())
 
-    def init(self, srcdir):
+    def init(self, srcdir, extra_args=None):
+        if extra_args is None:
+            extra_args = []
         args = [srcdir, self.builddir,
                 '--prefix', self.prefix,
                 '--libdir', self.libdir]
-        self._run(self.meson_command + args)
+        self._run(self.meson_command + args + extra_args)
         self.privatedir = os.path.join(self.builddir, 'meson-private')
 
     def build(self):
@@ -410,6 +418,59 @@ class LinuxlikeTests(unittest.TestCase):
         self.assertTrue('TEST_ENV is set' in vg_log)
         self.assertTrue('Memcheck' in vg_log)
 
+    def _test_stds_impl(self, testdir, compiler, p):
+        lang_std = p + '_std'
+        # 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:
+            std_opt = '{}={}'.format(lang_std, v)
+            self.init(testdir, ['-D' + std_opt])
+            cmd = self.get_compdb()[0]['command']
+            if v != 'none':
+                cmd_std = "'-std={}'".format(v)
+                self.assertIn(cmd_std, cmd)
+            try:
+                self.build()
+            except:
+                print('{} was {!r}'.format(lang_std, v))
+                raise
+            self.wipe()
+        # Check that an invalid std option in CFLAGS/CPPFLAGS fails
+        # Needed because by default ICC ignores invalid options
+        cmd_std = '-std=FAIL'
+        env_flags = p.upper() + 'FLAGS'
+        os.environ[env_flags] = cmd_std
+        self.init(testdir)
+        cmd = self.get_compdb()[0]['command']
+        qcmd_std = "'{}'".format(cmd_std)
+        self.assertIn(qcmd_std, cmd)
+        with self.assertRaises(subprocess.CalledProcessError,
+                               msg='{} should have failed'.format(qcmd_std)):
+            self.build()
+
+    def test_compiler_c_stds(self):
+        '''
+        Test that C stds specified for this compiler can all be used. Can't be
+        an ordinary test because it requires passing options to meson.
+        '''
+        testdir = os.path.join(self.common_test_dir, '1 trivial')
+        env = Environment(testdir, self.builddir, self.meson_command,
+                          get_fake_options(), [])
+        cc = env.detect_c_compiler(False)
+        self._test_stds_impl(testdir, cc, 'c')
+
+    def test_compiler_cpp_stds(self):
+        '''
+        Test that C++ stds specified for this compiler can all be used. Can't
+        be an ordinary test because it requires passing options to meson.
+        '''
+        testdir = os.path.join(self.common_test_dir, '2 cpp')
+        env = Environment(testdir, self.builddir, self.meson_command,
+                          get_fake_options(), [])
+        cpp = env.detect_cpp_compiler(False)
+        self._test_stds_impl(testdir, cpp, 'cpp')
+
+
 class RewriterTests(unittest.TestCase):
 
     def setUp(self):

test cases/common/1 trivial/meson.build

@@ -6,6 +6,11 @@ project('trivial test',
 #this is a comment
 sources = 'trivial.c'
 
+if meson.get_compiler('c').get_id() == 'intel'
+  # Error out if the -std=xxx option is incorrect
+  add_project_arguments('-diag-error', '10159', language : 'c')
+endif
+
 exe = executable('trivialprog', sources : sources)
 
 test('runtest', exe) # This is a comment

test cases/common/2 cpp/meson.build

@@ -1,3 +1,9 @@
 project('c++ test', 'cpp')
+
+if meson.get_compiler('cpp').get_id() == 'intel'
+  # Error out if the -std=xxx option is incorrect
+  add_project_arguments('-diag-error', '10159', language : 'cpp')
+endif
+
 exe = executable('trivialprog', 'trivial.cc', extra_files : 'something.txt')
 test('runtest', exe)