Hi,

I am trying to remove deprecated python setup.py install calls in our CI and building instructions for Slycot:
python-control/Slycot#173

I am unable to pass scikit-build command line arguments through pip in a conda-build recipe for Windows.

This one works:

set BLAS_ROOT=%PREFIX%
set LAPACK_ROOT=%PREFIX%

"%PYTHON%" setup.py install -G "NMake Makefiles" -DBLA_VENDOR=Generic

if errorlevel 1 exit 1

On Unix-like systems I can do:

export SKBUILD_CONFIGURE_OPTIONS="-DBLA_VENDOR=Generic"
$PYTHON -m pip install -v . --no-build-isolation --global-option='--generator="Unix Makefiles"'

How do I set the generator for pip builds on Windows?

set "SKBUILD_CONFIGURE_OPTIONS=-DBLA_VENDOR=Generic"
"%PYTHON%" -m pip install . --no-build-isolation --global-option="--generator=NMake Makefiles" -vv

doesn't do the trick.

I also reconn that using pip --global-option, --build-option and so on are actually not sustainable. (pypa/pip#9774, pypa/pip#9769)

So how do I specify the generator from the CLI or environment for a modern Python installation without setup.py on all platforms?