Load a shared library linked to Rust library in R

Following up on this question here, I am having issues using dyn.load to load a shared library that is linked to a Rust dylib. I suspect it has something to do with where R is looking for the Rust dylib, but I have not found a way to specify another location than whatever the default is.

From R, I execute the following:

> dyn.load('src/test.so')

And receive this error message:

Error in dyn.load("src/test.so") : 
  unable to load shared object '/Users/Zelazny7/r-dev/rustr/src/test.so':
  dlopen(/Users/Zelazny7/r-dev/rustr/src/test.so, 6): Library not loaded: libglue.dylib
  Referenced from: /Users/Zelazny7/r-dev/rustr/src/test.so
  Reason: image not found

How do I load a shared library that depends on another shared library?

The documentation for dyn.load does not specify how to do this.

Update:

Thanks to shepmaster I was able to successfully build and import a shared library in R. The shared library was compiled in C and is itself linked to a Rust library. These were my steps:

My directory contents:

C:Usersgraveseetest>ls
rglue.dll  rglue.rs  rustr.c  treble.h

Compiling the final shared library:

gcc -shared -m64 -I"C:Program FilesRR-3.2.0include" rustr.c -L"C:Program FilesRR-3.2.0binx64" -lR -L. -lrglue -o test.dll

Loading the library in R:

> dyn.load("test.dll")
> is.loaded("triple")
[1] TRUE
> .Call("triple", as.integer(32))
The triple is 96

The problem is going to boil down to the fact that your shared libraries are not in the directories that your system expects them to be by default.

There are a few tricks that you can use, 2 of which I was able to make work:

DYLD_LIBRARY_PATH=/path/to/rust/lib/ R

g++ -shared treble.cxx -o treble.so -L/tmp/ -Wl,-rpath,/tmp -lglue

install_name_tool -change libglue.dylib /tmp/libglue.dylib treble.so

Basically, you will want to look up how to have shared libraries that depend on other shared libraries when multiple of those libraries do not exist in your default linker search paths.

Sources

Linking a dynamic library (libjvm.dylib) in Mac OS X (rpath issue)

Print rpath of executable on OSX

@executable_path, @load_path and @rpath

How do I modify the install name of a .dylib at build time

clang, change dependent shared library install name at link time

虽然最初的答案很好，但我在这里提出了一个替代方法。

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