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Under non-Windows platforms, also create a dynamic library version of the runtime. Build of either version of the library can be switched on using FLANG_RT_ENABLE_STATIC=ON respectively FLANG_RT_ENABLE_SHARED=ON. Default is to build only the static library, consistent with previous behaviour. This is because the way the flang driver invokes the linker, most linkers choose the dynamic library by default, if available. Building the dynamic library therefore causes flang-built executables to depend on `libflang_rt.so`, unless explicitly told otherwise.