On Wed, 17 Oct 2018 at 18:33, Michel Onoff <michel.onoff@web.de> wrote:

Afaik, dlopen(3), which I presume UFFI uses internally to load (shared)
libraries on demand (I cannot imagine anything else), looks in
LD_LIBRARY_PATH (DYLD_LIBRARY_PATH on macOS), not in PATH.

What is the strategy that UFFI internally uses in its own implementation
to search for a library? What if that library depends on other libraries
in turn? Where would these ones be searched for?

I'm not really familiar with the mechanism, but a quick trawl of the VM sources found these...

[1] https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/platforms/unix/vm/sqUnixExternalPrims.c

[2] https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/platforms/Mac%20OS/vm/sqMacUnixExternalPrims.c

[3] https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/platforms/iOS/vm/OSX/sqMacUnixExternalPrims.m

[4] https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/platforms/iOS/vm/iPhone/sqMacUnixExternalPrims.m

For [1] and [2],��ioLoadModule() seems to use LD_LIBRARY_PATH,��

but [3] and [4] don't.

IIUC, [2] is a deprecated version and [3] is the one you are concerned about.

btw, If you want to discuss those files, consider cross posting to vm-dev.

http://lists.squeakfoundation.org/mailman/listinfo/vm-dev

cheers -ben