Duplicate symbol: blake2b when linking with libsodium

Mesrine

Hi,

I have developed a library that use "QbyteArray" from Qt and also libsodium functions like "crypto_sign_seed_keypair".

When compiling to wasm the library builds.
But when compiling an executable that depends on the library and call functions that will call "crypto_sign_seed_keypair"(of libsodium) the linker complains about duplicate symbols.
Specifically, when doing make step:

make
[ 16%] Building CXX object _deps/ed25519-build/CMakeFiles/ed25519.dir/ed25519.cpp.o
[ 33%] Linking CXX static library libed25519.a
[ 33%] Built target ed25519
[ 50%] Building CXX object CMakeFiles/qed25519.dir/qed25519.cpp.o
[ 66%] Linking CXX static library libqed25519.a
[ 66%] Built target qed25519
[ 83%] Building CXX object tests/CMakeFiles/test1.dir/test1.cpp.o
[100%] Linking CXX executable test1.js
wasm-ld: error: duplicate symbol: blake2b_init_param
>>> defined in /home/user/Qt/6.3.1/wasm_32/lib/libQt6Core.a(qcryptographichash.cpp.o)
>>> defined in /home/user/WASM/LATEST/libsodium-stable/libsodium-js/lib/libsodium.a(libsodium_la-blake2b-ref.o)

wasm-ld: error: duplicate symbol: blake2b_init
>>> defined in /home/user/Qt/6.3.1/wasm_32/lib/libQt6Core.a(qcryptographichash.cpp.o)
>>> defined in /home/user/WASM/LATEST/libsodium-stable/libsodium-js/lib/libsodium.a(libsodium_la-blake2b-ref.o)

wasm-ld: error: duplicate symbol: blake2b_init_key
>>> defined in /home/user/Qt/6.3.1/wasm_32/lib/libQt6Core.a(qcryptographichash.cpp.o)
>>> defined in /home/user/WASM/LATEST/libsodium-stable/libsodium-js/lib/libsodium.a(libsodium_la-blake2b-ref.o)

wasm-ld: error: duplicate symbol: blake2b_final
>>> defined in /home/user/Qt/6.3.1/wasm_32/lib/libQt6Core.a(qcryptographichash.cpp.o)
>>> defined in /home/user/WASM/LATEST/libsodium-stable/libsodium-js/lib/libsodium.a(libsodium_la-blake2b-ref.o)

wasm-ld: error: duplicate symbol: blake2b
>>> defined in /home/user/Qt/6.3.1/wasm_32/lib/libQt6Core.a(qcryptographichash.cpp.o)
>>> defined in /home/user/WASM/LATEST/libsodium-stable/libsodium-js/lib/libsodium.a(libsodium_la-blake2b-ref.o)

It seems that both static libraries qt6Core and libsodium use the same blake2b source codes.
I need both libraries(qt6Core and libsodium) in my library.
But I do not need to link to qcryptographichash.cpp.o object.
How can i neglect this object when linking using emscripten?
I use cmake.

I will much appreciate if some one advise me on how to resolve this.
Thanks for your time.

Mesrine

I noticed that ed25519 do not need blake2b. A temporal solution was to remove the object "libsodium_la-blake2b-ref.o" from libsodium.a by using

 ar dv libsodium.a libsodium_la-blake2b-ref.o

I can not remove "qcryptographichash.cpp.o" from libQt6Core.a because I use that on other libraries.