Added support for clang with GNU stdlib (relevant on Ubuntu 18.04) #153
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This PR adds support for using clang with GNU stdlib on older versions of stdlib where its required to pass
stdc++fs
to the linker.NOTE: In the cmake check for
clang_with_gnu_stdlib
, there is a generator expression checking$<NOT:$<BOOL:${WIN32}>>
. This is not exactly what I would like to have there. Better would be a check for Linux, but I did not find a nice way to put that into a generator expression. MaybeUNIX
would do, but the fix is also not required on Apple.Closes #152