docs: add conda help to faqs (#868)

Adding some more FAQs.

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

.pre-commit-config.yaml

@@ -88,7 +88,7 @@ repos:
           - rich
           - setuptools-scm
           - tomli
-          - types-setuptools~=70.0
+          - types-setuptools>=70.1
 
   - repo: https://github.com/henryiii/check-sdist
     rev: "v1.0.0rc2"

README.md

@@ -10,6 +10,7 @@
 [![PyPI version][pypi-version]][pypi-link]
 [![Conda-Forge][conda-badge]][conda-link]
 [![PyPI platforms][pypi-platforms]][pypi-link]
+[![Downloads][download-badge]][download-link]
 
 > [!NOTE]
 >
@@ -366,26 +367,28 @@ those of the author(s) and do not necessarily reflect the views of the National
 Science Foundation.
 
 <!-- prettier-ignore-start -->
+[OAC-2209877]:              https://www.nsf.gov/awardsearch/showAward?AWD_ID=2209877&HistoricalAwards=false
 [actions-badge]:            https://github.com/scikit-build/scikit-build-core/workflows/CI/badge.svg
 [actions-link]:             https://github.com/scikit-build/scikit-build-core/actions
+[cmeel]:                    https://github.com/cmake-wheel/cmeel
+[codecov-badge]:            https://codecov.io/gh/scikit-build/scikit-build-core/branch/main/graph/badge.svg?token=ZLbQzIvyG8
+[codecov-link]:             https://codecov.io/gh/scikit-build/scikit-build-core
 [conda-badge]:              https://img.shields.io/conda/vn/conda-forge/scikit-build-core
 [conda-link]:               https://github.com/conda-forge/scikit-build-core-feedstock
-[cmeel]:                    https://github.com/cmake-wheel/cmeel
-[github-discussions-badge]: https://img.shields.io/static/v1?label=Discussions&message=Ask&color=blue&logo=github
-[github-discussions-link]:  https://github.com/orgs/scikit-build/discussions
 [discord-badge]:            https://img.shields.io/discord/803025117553754132?label=Discord%20chat%20%23scikit-build
 [discord-link]:             https://discord.gg/pypa
-[codecov-badge]:            https://codecov.io/gh/scikit-build/scikit-build-core/branch/main/graph/badge.svg?token=ZLbQzIvyG8
-[codecov-link]:             https://codecov.io/gh/scikit-build/scikit-build-core
+[download-badge]:           https://static.pepy.tech/badge/scikit-build-core/month
+[download-link]:            https://pepy.tech/project/scikit-build-core
+[enscons]:                  https://pypi.org/project/enscons
+[github-discussions-badge]: https://img.shields.io/static/v1?label=Discussions&message=Ask&color=blue&logo=github
+[github-discussions-link]:  https://github.com/orgs/scikit-build/discussions
+[hatchling]:                https://hatch.pypa.io/latest
+[maturin]:                  https://www.maturin.rs
+[meson-python]:             https://meson-python.readthedocs.io
+[py-build-cmake]:           https://tttapa.github.io/py-build-cmake
 [pypi-link]:                https://pypi.org/project/scikit-build-core/
 [pypi-platforms]:           https://img.shields.io/pypi/pyversions/scikit-build-core
 [pypi-version]:             https://badge.fury.io/py/scikit-build-core.svg
 [rtd-badge]:                https://readthedocs.org/projects/scikit-build-core/badge/?version=latest
 [rtd-link]:                 https://scikit-build-core.readthedocs.io/en/latest/?badge=latest
-[OAC-2209877]:              https://www.nsf.gov/awardsearch/showAward?AWD_ID=2209877&HistoricalAwards=false
-[hatchling]:                https://hatch.pypa.io/latest
-[maturin]:                  https://www.maturin.rs
-[meson-python]:             https://meson-python.readthedocs.io
-[enscons]:                  https://pypi.org/project/enscons
-[py-build-cmake]:           https://tttapa.github.io/py-build-cmake
 <!-- prettier-ignore-end -->

docs/faqs.md

@@ -76,6 +76,48 @@ are not redistrubutable cannot be uploaded to PyPI[^2]. You have to run your
 wheels through `auditwheel` to make `manylinux` wheels. `cibuildwheel`
 automatically does this for you. See [repairing](#repairing-wheels).
 
+## Making a Conda recipe
+
+`scikit-build-core` is available on conda-forge, and is used in [dozens of recipes][]. There are a few things to keep in mind.
+
+You need to recreate your `build-system.requires` in the `host` table, with the
+conda versions of your dependencies. You also need to add `cmake` and either
+`make` or `ninja` to your `build:` table. Conda-build hard-codes
+`CMAKE_GENERATOR="Unix Makefiles` on UNIX systems, so you have to set or unset
+this to use Ninja if you prefer Ninja. The `scikit-build-core` recipe cannot
+depend on `cmake`, `make`, or `ninja`, because that would add those to the
+wrong table (`host` instead of `build`). Here's an example:
+
+```yaml
+build:
+  script:
+   - {{ PYTHON }} -m pip install . -vv
+
+requirements:
+  build:
+    - python                              # [build_platform != target_platform]
+    - cross-python_{{ target_platform }}  # [build_platform != target_platform]
+    - {{ compiler('c') }}
+    - {{ stdlib('c') }}
+    - {{ compiler('cxx') }}
+    - cmake >=3.15
+    - make                                 # [not win]
+  host:
+    - python
+    - pip
+    - scikit-build-core >=0.2.0
+  run:
+    - python
+```
+
+
+
+## Supporting free-threaded builds on Windows
+
+Windows currently requires a little extra care. You should set the C define
+`Py_GIL_DISABLED` on Windows; due to the way the two builds share the same
+config files, Python cannot set it for you on the free-threaded variant.
+
 [^1]:
     Due to a [bug in packaging](https://github.com/pypa/packaging/issues/160),
     some backends may mistakenly produce the wrong tags (including
@@ -91,5 +133,6 @@ automatically does this for you. See [repairing](#repairing-wheels).
 [scientific python cookie]: https://github.com/scientific-python/cookie
 [scientific python development guidelines]: https://learn.scientific-python.org/development
 [pybind11 example]: https://github.com/pybind/scikit_build_example
+[dozens of recipes]: https://github.com/search?type=code&q=org%3Aconda-forge+path%3Arecipe%2Fmeta.yaml+scikit-build-core
 
 <!-- prettier-ignore-end -->

src/scikit_build_core/setuptools/build_cmake.py

@@ -112,7 +112,7 @@ def run(self) -> None:
 
         bdist_wheel = dist.get_command_obj("bdist_wheel")
         assert bdist_wheel is not None
-        limited_api = bdist_wheel.py_limited_api  # type: ignore[attr-defined]
+        limited_api = bdist_wheel.py_limited_api
 
         # TODO: this is a hack due to moving temporary paths for isolation
         if build_temp.exists():
@@ -150,7 +150,7 @@ def run(self) -> None:
             name=dist.get_name(),
             version=Version(dist.get_version()),
             defines=defines,
-            limited_api=limited_api,
+            limited_api=bool(limited_api),
             configure_args=configure_args,
         )