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gcc8 requires linking with libstdc++fs for access to std::filesystem under C++17.
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GCC 8 requires linking with
libstdc++fsfor access tostd::filesystemunder C++17. Doing this viaCMAKE_*_LINKER_FLAGS,LDFLAGS, etc ends up with the library too early on the link line, so it's not solvable without altering the CMake code.Add
libstdc++fsas a link library forlibpdal_utilwhen compiling with GCC 8Fixes #3826