Install build-details.json on Windows

recipe/build_base.bat

@@ -236,6 +236,11 @@ if "%CONDA_BUILD_CROSS_COMPILATION%" == "1" (
 %PYTHON% -Wi %PREFIX%\lib\python\compileall.py -f -q -x "bad_coding|badsyntax|py2_" %PREFIX%\lib\python
 if errorlevel 1 exit 1
 
+:: Install a PEP 739 build-details.json next to the stdlib, like on unix
+%PYTHON% %RECIPE_DIR%\generate_build_details_win.py %SRC_DIR% %PREFIX%\lib\python\build-details.json
+if errorlevel 1 exit 1
+type %PREFIX%\lib\python\build-details.json
+
 :: Ensure that scripts are generated
 :: https://github.com/conda-forge/python-feedstock/issues/384
 %PYTHON% %RECIPE_DIR%\fix_staged_scripts.py

recipe/generate_build_details_win.py

@@ -0,0 +1,58 @@
+"""Generate a PEP 739 build-details.json for the conda Windows layout.
+
+Uses upstream's PC/layout generator (which does not need to run the target
+interpreter, so it also works when cross-compiling) and adjusts the paths
+for conda's unix-like Windows layout, where the file is installed into the
+stdlib directory (%PREFIX%\\lib\\python) just like on unix.
+
+Usage: python generate_build_details_win.py SRC_DIR OUTPUT_FILE
+"""
+
+import json
+import os
+import sys
+import types
+
+
+def main():
+    src_dir, output = sys.argv[1:3]
+
+    # Make PC/layout/support/constants.py read the version from the sources
+    # rather than from the running interpreter.
+    os.environ["PYTHONINCLUDE"] = os.path.join(src_dir, "Include")
+    sys.path.insert(0, os.path.join(src_dir, "PC", "layout"))
+    from support.builddetails import get_builddetails
+
+    arch = {
+        "win-64": "amd64",
+        "win-32": "win32",
+        "win-arm64": "arm64",
+    }[os.environ["target_platform"]]
+
+    ns = types.SimpleNamespace(
+        include_builddetails_json=True,
+        include_freethreaded=os.environ.get("PY_FREETHREADING") == "yes",
+        debug=os.environ.get("PY_INTERP_DEBUG") == "yes",
+        include_dev=True,
+        arch=arch,
+    )
+    ((_, (_, content)),) = list(get_builddetails(ns))
+    details = json.loads(content)
+
+    # The file lives in %PREFIX%\lib\python; all other paths are relative
+    # to base_prefix.
+    details["base_prefix"] = "../.."
+    # build_base.bat always installs python.exe (copied for debug and
+    # free-threaded builds), whereas e.g. python_d.exe is not always there.
+    details["base_interpreter"] = "./python.exe"
+    for key in ("dynamic", "dynamic_stableabi"):
+        details["libpython"][key] = "./" + details["libpython"][key]
+    details["c_api"]["headers"] = "./include/python"
+
+    with open(output, "w", encoding="utf-8") as f:
+        json.dump(details, f, indent=2)
+        f.write("\n")
+
+
+if __name__ == "__main__":
+    main()

recipe/meta.yaml

@@ -4,7 +4,7 @@
 {% set ver2 = '.'.join(version.split('.')[0:2]) %}
 {% set ver2nd = ''.join(version.split('.')[0:2]) %}
 {% set ver3nd = ''.join(version.split('.')[0:3]) %}
-{% set build_number = 0 %}
+{% set build_number = 1 %}
 
 # this makes the linter happy
 {% set channel_targets = channel_targets or 'conda-forge main' %}