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build: link the shared libxad from xad 2.2 - #11
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Build QuantLib and the extension against the installed xad package (find_package(XAD CONFIG) via xad.get_cmake_dir()) instead of lib/xad, with thread-local tapes and the dynamic MSVC runtime. The extension finds libxad through an rpath to xad/lib; wheel repair excludes it.
QuantLib and xad share the active tape through libxad, so xad.Tape no longer needs wrapping.
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Use the shared libxad from the xad 2.2 wheel, so xad and QuantLib share one tape per thread.
find_package(XAD 2.2 CONFIG)viaxad.get_cmake_dir();lib/xadsubmodule removed._activate_tape) removed.