CMake: Enable projects to set the C++ version #10464
Merged
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This change enables projects that consume protobuf via
FetchContent_MakeAvailable()
to set the C++ version to be used. This isnecessary, as linking code compiled for different C++ standards is asking for
trouble (and will simply not work in some cases).
Check that any version that might be set in
CMAKE_CXX_STANDARD
is newenough (C++14 or later). On Cygwin, check if any
-std=gnu++XX
hasalready been set. In all cases, default to C++14.