Hooks: distutils: Fix no suitable dest location found for pyconfig.h.

Locating `pyconfig.h` and the `makefile` gets into a mess when using
certain environment managers (pyenv-virtualenv) because PyInstaller,
whilst trying to find an appropriate `dest` path to put the files in,
gets confused by `sys.prefix` (or its varients) not being a parent dir of
the config and makefiles.

As of Python 3.6, direct parsing of `pyconfig.h` and `makefile` are
replaced by a Python module generated on building Python so that
these files are no longer required.

PyInstaller/hooks/hook-distutils.py

@@ -17,19 +17,14 @@
 runtime for platform-specific metadata.
 """
 
-# TODO Verify that bundling Makefile and pyconfig.h is still required for Python 3.
-
-import os
+from PyInstaller import compat
+
+# From Python 3.6 and later ``distutils.sysconfig`` takes on the same
+# behaviour as regular ``sysconfig`` of moving the config vars to a
+# module (see hook-sysconfig.py). It doesn't use a nice
+# `get module name` function like ``sysconfig`` does to help us
+# locate it but the module is the same file that ``sysconfig`` uses so
+# we can use the ``_get_sysconfigdata_name()`` from regular ``sysconfig``.
 import sysconfig
-
-from PyInstaller.utils.hooks import relpath_to_config_or_make
-
-_CONFIG_H = sysconfig.get_config_h_filename()
-_MAKEFILE = sysconfig.get_makefile_filename()
-
-# Data files in PyInstaller hook format.
-datas = [(_CONFIG_H, relpath_to_config_or_make(_CONFIG_H))]
-
-# The Makefile does not exist on all platforms, eg. on Windows
-if os.path.exists(_MAKEFILE):
-    datas.append((_MAKEFILE, relpath_to_config_or_make(_MAKEFILE)))
+if not compat.is_win and hasattr(sysconfig, '_get_sysconfigdata_name'):
+    hiddenimports = [sysconfig._get_sysconfigdata_name()]

news/5218.hooks.rst

@@ -0,0 +1 @@
+Update hook for ``distutils.sysconfig`` to be compatible with pyenv-virtualenv.