LD_LIBRARY_PATH not properly set for `cargo run`

cargo run doesn't finds the *.so files that have been generated by the build scripts, and are in a sub-directory of target. Why?


I just compiled proj hello-word with the following feature:

proj = { version = "0.16.2", features = ["bundled_proj"] }

The bundled_proj feature allows you to link against a PROJ included with (and built from source by) the proj-sys crate, upon which this crate is built. To do so, enable the bundled_proj Cargo feature.

As you can see, the PROJ library has been correctly built and the .so have been generated.

$ ls **/*proj*.so* -l
lrwxrwxrwx. 1 rmoussu domain users       13 May 14 19:39 target/debug/build/proj-sys-d63ece34f7e325f8/out/build/lib/libproj.so -> libproj.so.19
lrwxrwxrwx. 1 rmoussu domain users       17 May 14 19:39 target/debug/build/proj-sys-d63ece34f7e325f8/out/build/lib/libproj.so.19 -> libproj.so.19.1.0
-rwxr-xr-x. 1 rmoussu domain users 36594520 May 14 19:39 target/debug/build/proj-sys-d63ece34f7e325f8/out/build/lib/libproj.so.19.1.0
lrwxrwxrwx. 1 rmoussu domain users       13 May 14 19:40 target/debug/build/proj-sys-d63ece34f7e325f8/out/lib64/libproj.so -> libproj.so.19
lrwxrwxrwx. 1 rmoussu domain users       17 May 14 19:40 target/debug/build/proj-sys-d63ece34f7e325f8/out/lib64/libproj.so.19 -> libproj.so.19.1.0
-rwxr-xr-x. 1 rmoussu domain users 36594520 May 14 19:39 target/debug/build/proj-sys-d63ece34f7e325f8/out/lib64/libproj.so.19.1.0

However cargo doesn't seems to find them.

$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.06s
     Running `target/debug/transform`
target/debug/transform: error while loading shared libraries: libproj.so.19: cannot open shared object file: No such file or directory

If I specify them manually, the binary runs correctly.

$ LD_LIBRARY_PATH="$PWD/target/debug/build/proj-sys-d63ece34f7e325f8/out/build/lib/:$LD_LIBRARY_PATH" cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.05s
     Running `target/debug/transform`

According to the author of the crate proj, it seems that the issue is on his side, but if someone could help us, it would be welcome.

I took a look at the chapter in cargo book on the build script, but I'm not sure what to do.

Note: I also reported the error on proj github

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