Conda build issue demo

[h-vetinari]

For a long time this feedstock has contained a note about a conda-build bug:

blas-feedstock/recipe/meta.yaml

Lines 241 to 249 in 166a641

	# Building with blis fails due to a conda-build bug
	{% if blas_impl != 'blis' %}
	- {{ pin_subpackage("liblapack", exact=True) }}
	- {{ pin_subpackage("liblapacke", exact=True) }}
	- {{ pin_subpackage("libcblas", exact=True) }}
	- {{ pin_subpackage("libblas", exact=True) }}
	{% else %}
	- blis 0.9.0
	{% endif %}

blas-feedstock/recipe/test_blas.sh

Lines 12 to 15 in 166a641

	if [[ "${blas_impl}" == "blis" ]]; then
	# conda-build can't install a correct environment for testing
	conda install -c conda-forge "libblas=*=*blis" "libcblas=*=*blis" "liblapack=*=*netlib" "liblapacke=*=*netlib" --use-local --yes -p $PREFIX
	fi

This is to document the issue publicly, which (AFAICT) boils down to an incorrect merge of the different (but not actually conflicting) variants being at play.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[h-vetinari]

Interestingly, the bug seems to have been fixed in conda-build 🥳

[h-vetinari]

Ah, celebrated too soon - I picked this into #114 and now the failure is back:

  File "C:\Miniforge\lib\site-packages\conda_build\render.py", line 749, in finalize_metadata
    _simplify_to_exact_constraints(m)
  File "C:\Miniforge\lib\site-packages\conda_build\render.py", line 598, in _simplify_to_exact_constraints
    raise ValueError(f"Conflicting exact pins: {exact_pins}")
ValueError: Conflicting exact pins: [['3.11.0', '0_h7bd1d87_netlib'], ['3.11.0', '0_win64_blis'], ['3.11.0', '0_h7bd1d87_netlib']]

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12406531693. Examine the logs at this URL for more detail.}