[Bug Report]

[RobertPincus]

Describe the bug
conda-build fails on MacOS 15.1.1 running on Apple ARM (Python 3.11.11)

To Reproduce
Following the instructions for building a local installation with conda as in README.md on branch main, the step condo build condo.recipe runs for a while and fails. Example output include missing symbols and many uses of "placehold_":

export PREFIX=/Users/robert/Documents/mambaforge/envs/pyRTE/conda-bld/pyrte_rrtmgp_1737578614018/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_
export SRC_DIR=/Users/robert/Documents/mambaforge/envs/pyRTE/conda-bld/pyrte_rrtmgp_1737578614018/test_tmp
import: 'pyrte_rrtmgp'
import: 'pyrte_rrtmgp'
+ pyrte_rrtmgp run_tests
Running tests...
Tests failed!
============================= test session starts ==============================
platform darwin -- Python 3.11.11, pytest-8.3.4, pluggy-1.5.0
rootdir: /Users/robert/Documents/mambaforge/envs/pyRTE/conda-bld/pyrte_rrtmgp_1737578614018
collected 0 items / 9 errors

==================================== ERRORS ====================================
_ ERROR collecting _test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/lib/python3.11/site-packages/pyrte_rrtmgp/tests/lw_solver_test/2stream_test/lw_solver_2stream_test.py _
ImportError while importing test module '$PREFIX/lib/python3.11/site-packages/pyrte_rrtmgp/tests/lw_solver_test/2stream_test/lw_solver_2stream_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/lib/python3.11/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/lib/python3.11/site-packages/pyrte_rrtmgp/tests/lw_solver_test/2stream_test/lw_solver_2stream_test.py:8: in <module>
    import pyrte_rrtmgp.pyrte_rrtmgp as py
E   ImportError: dlopen($PREFIX/lib/python3.11/site-packages/pyrte_rrtmgp/pyrte_rrtmgp.cpython-311-darwin.so, 0x0002): symbol not found in flat namespace '_rrtmgp_compute_Planck_source'

Expected behavior
I was hoping for a working installation :-)

Software Versions:

• OS:MacOS 15.1.1, Apple ARM
• Whatever is fetched by conda?

[sehnem]

This looks like an issue with the linking of the libraries, I had something similar in the past with my M1 Mac, I solved it adding some conditions to the CMakeList, but it may be breaking other installers.

if (${LINUX})
    target_link_libraries(${TARGET_NAME} PUBLIC gfortran)
elseif(APPLE)
    # On macOS, explicitly link against gfortran runtime
    if(APPLE_ARM)
        target_link_directories(${TARGET_NAME} PUBLIC /opt/homebrew/lib/gcc/current)
    else()
        target_link_directories(${TARGET_NAME} PUBLIC /usr/local/lib/gcc/current)
    endif()
    target_link_libraries(${TARGET_NAME} PUBLIC gfortran)
endif()

I could not reproduce it in my machine I used Miniconda3-py311_24.5.0-0-MacOSX-arm64 and the build and install worked. It is also working in the CI. Tomorrow I will try to use the exact version of mambaforge that you are using to see if I can reproduce it.

[RobertPincus]

@sehnem It seems plausible that conda build is missing the paths to some directories, but that can't be the only problem: the last line of the error log I copied above reads:
E ImportError: dlopen($PREFIX/lib/python3.11/site-packages/pyrte_rrtmgp/pyrte_rrtmgp.cpython-311-darwin.so, 0x0002): symbol not found in flat namespace '_rrtmgp_compute_Planck_source'