[#529] Add runtime test for runtime version and fix clang-tidy warning

Author: mikir

compiler/extensions/cpp/runtime/ClangTidySuppressions.txt

@@ -134,6 +134,9 @@ modernize-use-equals-default:src/zserio/Span.h:79
 # This is completely filtered out because it just would add two more lines making readability even worse.
 readability-braces-around-statements:
 
+# This must be preprocessor define because version is checked during compilation time.
+cppcoreguidelines-macro-usage:src/zserio/CppRuntimeVersion.h:12
+
 # Intentional tests.
 bugprone-use-after-move:test/zserio/HeapOptionalHolderTest.cpp:178
 bugprone-use-after-move:test/zserio/HeapOptionalHolderTest.cpp:199

compiler/extensions/cpp/runtime/test/CMakeLists.txt

@@ -150,6 +150,7 @@ set(ZSERIO_CPP_RUNTIME_TEST_SRCS
     zserio/BuiltInOperatorsTest.cpp
     zserio/ConstraintExceptionTest.cpp
     zserio/CppRuntimeExceptionTest.cpp
+    zserio/CppRuntimeVersionTest.cpp
     zserio/DebugStringUtilTest.cpp
     zserio/EnumsTest.cpp
     zserio/FloatUtilTest.cpp

compiler/extensions/cpp/runtime/test/zserio/CppRuntimeVersionTest.cpp

@@ -0,0 +1,10 @@
+#include "zserio/CppRuntimeVersion.h"
+
+#include "gtest/gtest.h"
+
+TEST(CppRuntimeVersionTest, checkVersion)
+{
+    #if CPP_EXTENSION_RUNTIME_VERSION_NUMBER < 2011000
+        #error Zserio runtime library version is too old!
+    #endif
+}