Build failed when enable RKNN option

[weitianhan]

Shout out to your great work! It's easy to follow your instruction to build and run the project. It's working greatly on my RK3588 with CPU inference.

However, when I try to enable the RKNN acceleration, I failed to build the targets. It seems that the compiler fails to link the RKNN library. Could you guide me how to fix it?

What I have done is just adding -DUSE_RKNN=ON in cmake command.
I have make sure the RKNN library librknnrt.so is under /usr/lib and the header files rknn*.h are under /usr/include

[ 36%] Built target piper
[ 45%] Linking CXX executable paroli-cli
[ 54%] Linking CXX executable paroli-server
/usr/bin/ld: cannot find -lrknn: No such file or directory
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/paroli-cli.dir/build.make:99: paroli-cli] Error 1
make[1]: *** [CMakeFiles/Makefile2:113: CMakeFiles/paroli-cli.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
/usr/bin/ld: cannot find -lrknn: No such file or directory
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/paroli-server.dir/build.make:165: paroli-server] Error 1
make[1]: *** [CMakeFiles/Makefile2:139: CMakeFiles/paroli-server.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

[weitianhan]

Never mind the problem. I fix it by passing the library path in cmakelist.

if (USE_RKNN)
    target_compile_definitions(piper PRIVATE USE_RKNN)
    target_sources(piper PRIVATE piper/rknn-inferer.cpp)
-   target_link_libraries(piper PRIVATE rknn)
+   target_link_libraries(piper PRIVATE /usr/lib/librknnrt.so)
endif()

[marty1885]

Ah dang I broke it accidentally. Thanks for finding it. Will patch it soon!