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Ubuntu 20.04 use clang 10 and 11.
ubuntu 20.04 will cease development on April 25.
ros 2 releases require a c++17 standard.
Clang 11 release introduces the following features:
The default C language standard used when -std= is not specified has been upgraded from gnu11 to gnu17.
For this reason is important switch to clang11 or higher.
other changes: https://releases.llvm.org/11.1.0/tools/clang/docs/index.html