Import of the watch repository from Pebble

third_party/nanopb/tests/cxx_descriptor/SConscript

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+# Test cxx descriptor functionality
+
+Import('env')
+
+base_env = env.Clone()
+base_env.Replace(NANOPBFLAGS = '--cpp-descriptor')
+base_env.NanopbProto('message')
+
+for std in ["c++03", "c++11", "c++14", "c++17", "c++20"]:
+    e = base_env.Clone()
+    e.Append(CXXFLAGS = '-std={}'.format(std))
+
+    # Make sure compiler supports this version of C++ before we actually run the
+    # test.
+    conf = Configure(e)
+    compiler_valid = conf.CheckCXX()
+    e = conf.Finish()
+    if not compiler_valid:
+        print("Skipping {} test - compiler doesn't support it".format(std))
+        continue
+
+    if std == 'c++03':
+        e.Append(CPPDEFINES = {'PB_C99_STATIC_ASSERT': 1})
+
+    o1 = e.Object('message_descriptor_{}'.format(std), 'message_descriptor.cc')
+    o2 = e.Object('message.pb_{}'.format(std), 'message.pb.c')
+    p = e.Program([o1, o2])
+    e.RunTest(p)