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Because path.cc is compiled with -std=gnu++17 the static constexpr data member is implicitly 'inline' and so no definition gets emitted unless it gets used in that translation unit. Other translation units built as C++11 or C++14 still require a namespace-scope definition of the variable, so mark the definition as used. PR libstdc++/85818 * src/filesystem/path.cc (path::preferred_separator): Add used attribute. * testsuite/experimental/filesystem/path/preferred_separator.cc: New. Tested powerpc64le-linux, committed to trunk. Backport to gcc-8 to follow.
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