Build .NET 4.6 support conditionally

filmor · filmor · commit 19dc42edb3ff · 2026-05-05T21:53:51.000+02:00
diff --git a/Justfile b/Justfile
@@ -0,0 +1,14 @@
+default:
+    @just --choose
+
+setup:
+    dotnet restore
+    uv sync
+
+docs:
+    doxygen doc/Doxyfile
+    uv run --group doc sphinx-build doc/source/ ./doc/build/html/
+
+build-wheels:
+    uv build
+    uv build --wheel -C="--global-option=--net46-support"
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,6 +1,7 @@
 graft src/runtime
 prune src/runtime/obj
 prune src/runtime/bin
+graft src/compat
 include src/pythonnet.snk
 include Directory.Build.*
 include pythonnet.sln
diff --git a/doc/source/python.rst b/doc/source/python.rst
@@ -45,7 +45,8 @@ Mono (``mono``)
 
 .NET Framework (``netfx``)
     Default on Windows and also only supported there. Must be at least version
-    4.6.1, with 4.7.2 or later recommended.
+    4.6.1, with 4.7.2 or later recommended. For .NET 4.6 support, the wheel has
+    to be built with the environment variable `PYTHONNET_BUILD_NET46_SUPPORT=1`.
 
 .NET Core (``coreclr``)
     Self-contained is not supported, must be at least version 3.1.
diff --git a/setup.py b/setup.py
@@ -3,15 +3,20 @@
 import distutils
 from distutils.command.build import build as _build
 from setuptools.command.develop import develop as _develop
-from wheel.bdist_wheel import bdist_wheel as _bdist_wheel
 from setuptools import Distribution
 from setuptools import setup, Command
 
 import os
+import sys
 
 # Disable SourceLink during the build until it can read repo-format v1, #1613
 os.environ["EnableSourceControlManagerQueries"] = "false"
 
+NET46_SUPPORT_OPTION = "--net46-support"
+NET46_SUPPORT = NET46_SUPPORT_OPTION in sys.argv
+if NET46_SUPPORT:
+    sys.argv.remove(NET46_SUPPORT_OPTION)
+
 
 class DotnetLib:
     def __init__(self, name, path, **kwargs):
@@ -106,33 +111,27 @@ def install_for_development(self):
         return super().install_for_development()
 
 
-class bdist_wheel(_bdist_wheel):
-    def finalize_options(self):
-        # Monkey patch bdist_wheel to think the package is pure even though we
-        # include DLLs
-        super().finalize_options()
-        self.root_is_pure = True
-
-
 # Monkey-patch Distribution s.t. it supports the dotnet_libs attribute
 Distribution.dotnet_libs = None
 
 cmdclass = {
     "build": build,
     "build_dotnet": build_dotnet,
     "develop": develop,
-    "bdist_wheel": bdist_wheel,
 }
 
-dotnet_libs = [
-    DotnetLib(
-        "python-runtime",
-        "src/compat/Python.Runtime.Compat.csproj",
-        output="pythonnet/runtime",
-    )
-]
+
+if NET46_SUPPORT:
+    csproj = "src/compat/Python.Runtime.Compat.csproj"
+    plat_name = "win32"
+else:
+    csproj = "src/runtime/Python.Runtime.csproj"
+    plat_name = "any"
+
+dotnet_libs = [DotnetLib("python-runtime", csproj, output="pythonnet/runtime")]
 
 setup(
     cmdclass=cmdclass,
     dotnet_libs=dotnet_libs,
+    options={"bdist_wheel": {"plat_name": plat_name}},
 )
