Error: cannot open shared object file: No such file or directory. about evcxr HOT 10 OPEN

Try setting LD_LIBRARY_PATH to the absolute path to the directory that contains your dylib.

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Try setting LD_LIBRARY_PATH to the absolute path to the directory that contains your dylib.

Thanks for your help, I just tried what you said and got the same error.
When I use the function adding_from_Library in another program with command cargo run, the function works fine. But it doesn't work in notebook. I think it might be related to the method cargo_command from eval_context.rs. The generated command may lose something so the compiler cannot find the library.

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Does it work if you use

:env LD_LIBRARY_PATH=/path/to/dynlink/library
:restart

?

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Does it work if you use

:env LD_LIBRARY_PATH=/path/to/dynlink/library
:restart

?

I just tried what you said, and still got the same error.
Then I copied the libawesome_math.so file to the directory path_to_tmpdir\target\x86_64-unknown-linux-gnu\debug\deps, and still got the same error. I'm curious why this error happen, doesn't the compiler find the shared object in this directory. If it does, why the compiler cannot find the shared object?

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The error happens after compilation. It happens when evcxr attempts to dlopen the dylib is compiled for the user code. It finds the dylib, but then the dynamic linker doesn't find where libawesome_math.so is. Setting LD_LIBRARY_PATH should tell the dynamic linker in which directory it can find it, but for some reason that doesn't help for you.

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The error happens after compilation. It happens when evcxr attempts to dlopen the dylib is compiled for the user code. It finds the dylib, but then the dynamic linker doesn't find where libawesome_math.so is. Setting LD_LIBRARY_PATH should tell the dynamic linker in which directory it can find it, but for some reason that doesn't help for you.

Is there way that I copy the libawesome_math.so file to a specific location, so that the compiler can find it?

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The dynamic linker should look in /lib, /usr/lib, /usr/local/lib (only writable as root and I strongly recommend not to add any files here, but if you do anyway prefer /usr/local/lib. that one is not under the control of your distro's package manager) and all the directories mentioned by LD_LIBRARY_PATH. Can you check if println!("{:?}", std::env::var("LD_LIBRARY_PATH")); does mention the LD_LIBRARY_PATH you tried to set?

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The dynamic linker should look in /lib, /usr/lib, /usr/local/lib (only writable as root and I strongly recommend not to add any files here, but if you do anyway prefer /usr/local/lib. that one is not under the control of your distro's package manager) and all the directories mentioned by LD_LIBRARY_PATH. Can you check if println!("{:?}", std::env::var("LD_LIBRARY_PATH")); does mention the LD_LIBRARY_PATH you tried to set?

When I run this cell in notebook:

std::env::var("LD_LIBRARY_PATH")
//output: Ok("/root/dynlink/library")

I put the libawesome_math.so in /usr/lib, and deleted the build.rs file. Then I cd into directory dynlink/executable and ran cargo run, and got this error:

/root/dynlink/executable/src/lib.rs:7: undefined reference to `from_the_library'

It seems the putting the .so file in /usr/lib doesn't work on my computer.

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I tried creating a directory structure like you said and I got a different error. For me the error wasn't that it couldn't find the .so file, it was that it couldn't find the symbol. I'm not sure what you were doing to get it to try to load the .so file. I got it to load it by adding #[link(name = "awesome_math")] before extern in lib.rs.

I've attached a .tar.gz of the directory structure that worked for me. I didn't use LD_LIBRARY_PATH, but instead set rpath like you were doing in one of your earlier attempts.

358.tar.gz

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❯ ~/work/evcxr/target/debug/evcxr
Welcome to evcxr. For help, type :help
>> :dep executable = { path = "executable" }
   Compiling libc v0.2.151
   Compiling cc v1.0.83
   Compiling executable v0.1.0 (/home/david/tmp/358/executable)
>> executable::adding_from_library()
()
Adding: 3

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