macos_nativelib_dependencies.md

# Loading a MacOS Native Library's Dependencies

Assume we have `libBindingtest1p1.dylib`, which links to `libtest1.dylib`, i.e. requires the OS native library to load `libtest1.dylib` to resolve symbols.

Usually we just se `DYLD_LIBRARY_PATH` including the path where `libtest1.dylib` is located and we are good to go.

## Just use dynamic loading via GlueGen's ProcAddressTable

Note, the above problem does not occur when using GlueGen's ProcAddressTable, i.e. loading the underlying tool library `libtest2.dylib` w/ dlopen and passing all symbols to the JNI library `libBindingtest1p2.dylib`.

## Can't pass `DYLD_LIBRARY_PATH` to `/usr/bin/java`

This is supposed to be related to MacOS's `System Integrity Protect (SIP)`.

## Workaround inability to pass `DYLD_LIBRARY_PATH` to `/usr/bin/java`

### Use explicit OpenJDK/Temurin JDK `java` executable path

Interestingly passing `DYLD_LIBRARY_PATH` works using the explicit `java` executable path, set by default as follows:

    # MacOS: Select JVM path to allow DYLD_LIBRARY_PATH
    JAVA_HOME=`/usr/libexec/java_home -version 17`
    PATH=$JAVA_HOME/bin:$PATH
    export JAVA_HOME PATH

### Using ``@loader_path` within dependent library

Set location of referenced library `libtest1.dylib` to same path of dependent library `libBindingtest1p1.dylib` using `@loader_path`.

    cd build-macosx/test/build/natives/
    otool -L libBindingtest1p1.dylib
    install_name_tool -change libtest1.dylib @loader_path/libtest1.dylib libBindingtest1p1.dylib
    otool -L libBindingtest1p1.dylib

Further we could try `@executable_path` and `@rpath`.

See An alternative to macOS's DYLD_LIBRARY_PATH.