Could not load xacc_iontrap

[amccaskey]

From the latest qcor/cli docker image...

[2022-02-17 13:56:17.041] [xacc-logger] [error] [XACC Error] Could not load xacc_iontrap, error message: Bundle#14 start failed: Error loading shared library libxacc-circuit-optimizers.so: No such file or directory (needed by /usr/local/aideqc/qcor/plugins/libxacc-iontrap.so)
[2022-02-17 13:56:17.041] [xacc-logger] [error] [XACC Error] Framework Exiting

Of course just deleting xacc_iontrap gets you going, but there are some link problems with the plugin that should be fixed. I think, specifically, it is linking and using functions from another plugin, which is not something we should be doing.

Here's the ldd output

Error relocating /usr/local/aideqc/qcor/plugins/libxacc-iontrap.so: _ZN4xacc7quantum9GateFuser10initializeERKSt10shared_ptrINS_20CompositeInstructionEE: symbol not found
Error relocating /usr/local/aideqc/qcor/plugins/libxacc-iontrap.so: _ZNK4xacc7quantum9GateFuser13calcFusedGateEi: symbol not found
Error relocating /usr/local/aideqc/qcor/plugins/libxacc-iontrap.so: _ZTIN4xacc7quantum9GateFuserE: symbol not found

Problem is that the plugin RPATH is not pointing to INSTALL/plugins, so it won't be able to find the circuit optimizers library to link.

[amccaskey]

@ausbin I think you should try to get the GateFusion dependency out of this plugin at some point. The best way might be to create an interface at the quantum/gate/utils package level that GateFuser in circuit-optimizers can inherit from and contribute GateFuser as a plugin to the service registry under that new type. Then you can remove the link from xacc-circuit-optimizers on your iontrap plugin, and only rely on xacc-quantum-gate.

[ausbin]

Hi @amccaskey, sorry for the slow turnaround on my end. Attempt at a fix here: #521