Avoid invalid `-std=c++…` flag when `CXX_STANDARD` is empty in CMake macro
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@ -141,7 +141,7 @@ function (add_reflection_generator_invocation)
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if (ARGS_CLANG_OPTIONS_FROM_TARGETS)
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foreach (TARGET_NAME ${ARGS_CLANG_OPTIONS_FROM_TARGETS})
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# set c++ standard
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list(APPEND ARGS_CLANG_OPTIONS "-std=c++$<TARGET_PROPERTY:${TARGET_NAME},CXX_STANDARD>")
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list(APPEND ARGS_CLANG_OPTIONS "$<$<BOOL:$<TARGET_PROPERTY:${TARGET_NAME},CXX_STANDARD>>:-std=c++$<TARGET_PROPERTY:${TARGET_NAME},CXX_STANDARD>>")
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# add compile flags and options
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_reflective_rapidjson_set_prop("${TARGET_NAME}" COMPILE_FLAGS)
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list(APPEND ARGS_CLANG_OPTIONS "$<$<BOOL:${PROP}>:$<JOIN:${PROP},$<SEMICOLON>>>")
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