CmdStan on IBM Power-9 systems

Summary:

CmdStan fails to compile models on IBM Power-9 systems.

This issue was previously discussed in the following Stan discourse post, https://discourse.mc-stan.org/t/error-running-cmdstan-on-ibm-power9-system/22060. A step-by-step solution is given in the PDF document attached to the first post - possibly worth adding to the Stan documentation?

Description:

Trying to compile a Stan model on an IBM Power-9 system results in the following error:

make ../src/models/deaths_and_111_calls

--- Translating Stan model to C++ code ---
bin/stanc  --o=../src/models/deaths_and_111_calls.hpp ../src/models/deaths_and_111_calls.stan
/bin/bash: bin/stanc: cannot execute binary file
make: *** No rule to make target `../src/models/deaths_and_111_calls.hpp', needed by `../src/models/deaths_and_111_calls'.  Stop.

CmdStan is distributed with pre-compiled stanc binary files that were built for x86 architecture, not Power-9. Because of this, we must build and configure the Stan compiler by hand.

Reproducible Steps:

Compile any Stan model on an IBM Power-9 system.

Current Output:

See description,

Expected Output:

A compiled model.

Additional Information:

NA.

Current Version:

Initially v2.23.0, persists v2.27.0

Start by reproducing the make ../src/models/deaths_and_111_calls failure on an IBM Power-9 system and inspect the precompiled bin/stanc entry point. Review the linked Stan Discourse post and its attached PDF for the hand-built compiler configuration; done means a Stan model compiles successfully on Power-9, with the required steps documented if appropriate.