[R-SIG-Mac] Problems with runtime linking of R-extension

[Ralf Stubner]

> Am 23.02.2018 um 11:14 schrieb Keith O'Hara <keith.ohara at nyu.edu>:
> 
> Try adding '/usr/local/lib' to DYLD_LIBRARY_PATH and DYLD_FALLBACK_LIBRARY_PATH.

Unfortunately setting these variables (or LD_LIBRARY_PATH) to /usr/local/lib does not help with the error message. 

> If that doesn't fix the problem, try modifying the install name of libaf to include /usr/local/lib. Something like:
> 
> sudo install_name_tool -id /usr/local/lib/libaf.dylib /usr/local/lib/libaf.dylib
> 
> or
> 
> sudo install_name_tool -id /usr/local/lib/libaf.3.dylib /usr/local/lib/libaf.3.dylib

This helps to some extend, similar to adding „-rpath /usr/local/lib“ to PKG_LIBS. I am then able to load the library. However, ArrayFire does not find/load its backend libraries libafcpu.dynlib and libafopencl.dynlib, which are also located in /usr/local/lib and therefore reports „backends: 0". This does not happen with the plain C program that correctly finds two available backends.

To make things even stranger, the above is true when I start R from the Terminal. When using R.app or RStudio, I can load minimal.so (even without rpath option or manipulating the install name)  and calling the count_backends function gives the correct result. 

What does R.app and RStudio to differently from R in the Terminal?

Thanks
Ralf