Build failed when without RTTI (dynamic_cast not permitted with -fno-rtti) #1027
Description
Describe your environment
Can not build with ENABLE_METRICS_PREVIEW and without RTTI -fno-rtti .
Steps to reproduce
cmake [...] -DWITH_METRICS_PREVIEW=ON "-DCMAKE_CXX_FLAGS=-fno-rtti"
What is the actual behavior?
2021-10-23T10:53:26.5426468Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:408:31: required from here
2021-10-23T10:53:26.5428857Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:419:22: error: ‘dynamic_cast’ not permitted with ‘-fno-rtti’
2021-10-23T10:53:26.5430685Z 419 | auto agg_ptr = dynamic_cast<BoundValueRecorder<T> *>(x.second.get())->GetAggregator();
2021-10-23T10:53:26.5431433Z | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2021-10-23T10:53:26.5502316Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h: In instantiation of ‘std::vector<opentelemetry::v1::sdk::metrics::Record> opentelemetry::v1::sdk::metrics::ValueRecorder<T>::GetRecords() [with T = float]’:
2021-10-23T10:53:26.5504767Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:408:31: required from here
2021-10-23T10:53:26.5507189Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:419:22: error: ‘dynamic_cast’ not permitted with ‘-fno-rtti’
2021-10-23T10:53:26.5600746Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h: In instantiation of ‘std::vector<opentelemetry::v1::sdk::metrics::Record> opentelemetry::v1::sdk::metrics::ValueRecorder<T>::GetRecords() [with T = int]’:
2021-10-23T10:53:26.5603182Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:408:31: required from here
2021-10-23T10:53:26.5605249Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:419:22: error: ‘dynamic_cast’ not permitted with ‘-fno-rtti’
2021-10-23T10:53:26.5683511Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h: In instantiation of ‘std::vector<opentelemetry::v1::sdk::metrics::Record> opentelemetry::v1::sdk::metrics::ValueRecorder<T>::GetRecords() [with T = short int]’:
2021-10-23T10:53:26.5685919Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:408:31: required from here
2021-10-23T10:53:26.5688332Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:419:22: error: ‘dynamic_cast’ not permitted with ‘-fno-rtti’
2021-10-23T10:53:26.5715576Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h: In instantiation of ‘std::vector<opentelemetry::v1::sdk::metrics::Record> opentelemetry::v1::sdk::metrics::UpDownCounter<T>::GetRecords() [with T = double]’:
2021-10-23T10:53:26.5718040Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:279:31: required from here
2021-10-23T10:53:26.5720128Z /home/runner/work/cmake-toolset/cmake-toolset/test/third_party/packages/opentelemetry-cpp-v1.0.1/sdk/include/opentelemetry/sdk/metrics/sync_instruments.h:290:22: error: ‘dynamic_cast’ not permitted with ‘-fno-rtti’
2021-10-23T10:53:26.5721716Z 290 | auto agg_ptr = dynamic_cast<BoundUpDownCounter<T> *>(x.second.get())->GetAggregator();
2021-10-23T10:53:26.5722357Z | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~