[Bug]: Issues building multilocale Python libraries on a Mac

[lydia-duncan]

Summary of Problem

Description:
When I try to build a multilocale Python library using our --library-python flag, I get this message:

ld: unknown option: -shared

Looking at the man page for ld on my Mac, it appears that the flag to use for building dynamic libraries is instead -dynamic. Additionally, if I modify make/compiler/Makefile.clang to use that instead, I then get an error about not being able to find -lm.

I believe this used to work back when support for multilocale Python interoperability was added. Additionally, it looks like normal compilation of Chapel executables includes -lm, so there's probably some setting we're missing for this compilation mode that is present for other builds. It could also be that we're using a different linker than normal compilation as well, since I would expect single locale Python compilation to also try to build dynamically and I wasn't encountering this issue with those compiles.

Is this issue currently blocking your progress?
No, I think I'll be able to build for multilocale Python interop testing on our new virtual machine, just waiting on information about how to log in there

Steps to Reproduce

Source Code:

Any Chapel code compiled to be a Python library

Compile command:
chpl --library --library-python --library-dir=lib foo.chpl

Execution command:
N/A

Associated Future Test(s):
No specific future for it, since we don't currently have a job to test it.

Configuration Information

• Output of chpl --version: 2.3.0 pre-release
• Output of $CHPL_HOME/util/printchplenv --anonymize:
  CHPL_TARGET_PLATFORM: darwin
  CHPL_TARGET_COMPILER: clang
  CHPL_TARGET_ARCH: arm64
  CHPL_TARGET_CPU: none *
  CHPL_LOCALE_MODEL: flat
  CHPL_COMM: gasnet *
  CHPL_COMM_SUBSTRATE: udp
  CHPL_GASNET_SEGMENT: everything
  CHPL_TASKS: qthreads
  CHPL_LAUNCHER: amudprun
  CHPL_TIMERS: generic
  CHPL_UNWIND: none
  CHPL_MEM: jemalloc
  CHPL_ATOMICS: cstdlib
  CHPL_NETWORK_ATOMICS: none
  CHPL_GMP: bundled
  CHPL_HWLOC: bundled
  CHPL_RE2: bundled
  CHPL_LLVM: none *
  CHPL_AUX_FILESYS: none
  CHPL_LIB_PIC: pic
• Back-end compiler and version, e.g. gcc --version or clang --version: Apple clang version 16.0.0
• (For Cray systems only) Output of module list: N/A