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[jschwe]

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[jason-yau]

Wanted-help: When I add more than one Rust static library which is built with cxx crate, duplicated symbol errors occurred. I think it is because the cxx.cc source was compiled into the rust library. Then the libraries have same symbols which is defined in cxx.cc. Thus, when more than one such library is linked, the errors occur. How do solve this issue?

duplicate symbol '_cxxbridge1$exception' in:
    rust/libfoo.a(cxx-6f92fa0cc8784bc2.cxx.25a7702b-cgu.12.rcgu.o)
    rust/libbar.a(cxx-50d76a46afddca83.cxx.7a1aee28-cgu.12.rcgu.o)
duplicate symbol '_cxxbridge1$str$new' in:
    rust/libfoo.a(cxx-6f92fa0cc8784bc2.cxx.25a7702b-cgu.14.rcgu.o)
    rust/libbar.a(cxx-50d76a46afddca83.cxx.7a1aee28-cgu.14.rcgu.o)
duplicate symbol '_cxxbridge1$str$ptr' in:
    rust/libfoo.a(cxx-6f92fa0cc8784bc2.cxx.25a7702b-cgu.14.rcgu.o)
    rust/libbar.a(cxx-50d76a46afddca83.cxx.7a1aee28-cgu.14.rcgu.o)
duplicate symbol '_cxxbridge1$str$len' in:
    rust/libfoo.a(cxx-6f92fa0cc8784bc2.cxx.25a7702b-cgu.14.rcgu.o)
    rust/libbar.a(cxx-50d76a46afddca83.cxx.7a1aee28-cgu.14.rcgu.o)
duplicate symbol '_cxxbridge1$str$from' in:
    rust/libfoo.a(cxx-6f92fa0cc8784bc2.cxx.25a7702b-cgu.14.rcgu.o)
    rust/libbar.a(cxx-50d76a46afddca83.cxx.7a1aee28-cgu.14.rcgu.o)
    ........

[jschwe]

So just to clarify, you have:

• Some C++ library that you link into multiple Rust libraries.
• You then link those Rust libraries as static libraries into a foreign (e.g. C/C++) library

You should only invoke the linker once when creating the final binary. So, in your case, don't link your C++ code into the Rust library but defer the linking until the final step. You should be able to just do target_link_libraries(<rust_library> INTERFACE <cxx_library>) in CMake.