1 files changed, 79 insertions, 0 deletions
diff --git a/package/python3/0016-Add-importlib-fix-for-PEP-3147-issue.patch b/package/python3/0016-Add-importlib-fix-for-PEP-3147-issue.patch
new file mode 100644
index 000000000..02f1d164f
--- /dev/null
+++ b/package/python3/0016-Add-importlib-fix-for-PEP-3147-issue.patch
@@ -0,0 +1,79 @@
+From 1153f503a38daf6388021575f1ad6ce8b702911b Mon Sep 17 00:00:00 2001
+From: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
+Date: Wed, 23 Dec 2015 11:46:14 +0100
+Subject: [PATCH] Add importlib fix for PEP 3147 issue
+
+Python 3 has a new standard for installing .pyc file, called PEP
+3147. Unfortunately, this standard requires both the .py and .pyc
+files to be installed for a Python module to be found. This is quite
+annoying on space-constrained embedded systems, since the .py file is
+technically not required for execution.
+
+This patch changes cache_from_source() and source_from_cache() in
+importlib to get rid of the "__pycache__" directory.
+This effectively disables PEP 3147 for:
+
+* The python standard library
+* Packages built with distutils or setuptools
+* Packages built with automake that use the `py-compile` helper
+
+Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
+---
+ Lib/importlib/_bootstrap.py | 26 +++++---------------------
+ 1 file changed, 5 insertions(+), 21 deletions(-)
+
+diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
+index 5b91c05..a1755ec 100644
+--- a/Lib/importlib/_bootstrap.py
++++ b/Lib/importlib/_bootstrap.py
+@@ -444,8 +444,6 @@ def cache_from_source(path, debug_override=None):
+     If debug_override is not None, then it must be a boolean and is used in
+     place of sys.flags.optimize.
+ 
+-    If sys.implementation.cache_tag is None then NotImplementedError is raised.
+-
+     """
+     debug = not sys.flags.optimize if debug_override is None else debug_override
+     if debug:
+@@ -454,33 +452,19 @@ def cache_from_source(path, debug_override=None):
+         suffixes = OPTIMIZED_BYTECODE_SUFFIXES
+     head, tail = _path_split(path)
+     base, sep, rest = tail.rpartition('.')
+-    tag = sys.implementation.cache_tag
+-    if tag is None:
+-        raise NotImplementedError('sys.implementation.cache_tag is None')
+-    filename = ''.join([(base if base else rest), sep, tag, suffixes[0]])
+-    return _path_join(head, _PYCACHE, filename)
++    filename = ''.join([(base if base else rest), suffixes[0]])
++    return _path_join(head, filename)
+ 
+ 
+ def source_from_cache(path):
+     """Given the path to a .pyc./.pyo file, return the path to its .py file.
+ 
+     The .pyc/.pyo file does not need to exist; this simply returns the path to
+-    the .py file calculated to correspond to the .pyc/.pyo file.  If path does
+-    not conform to PEP 3147 format, ValueError will be raised. If
+-    sys.implementation.cache_tag is None then NotImplementedError is raised.
++    the .py file calculated to correspond to the .pyc/.pyo file.
+ 
+     """
+-    if sys.implementation.cache_tag is None:
+-        raise NotImplementedError('sys.implementation.cache_tag is None')
+-    head, pycache_filename = _path_split(path)
+-    head, pycache = _path_split(head)
+-    if pycache != _PYCACHE:
+-        raise ValueError('{} not bottom-level directory in '
+-                         '{!r}'.format(_PYCACHE, path))
+-    if pycache_filename.count('.') != 2:
+-        raise ValueError('expected only 2 dots in '
+-                         '{!r}'.format(pycache_filename))
+-    base_filename = pycache_filename.partition('.')[0]
++    head, filename = _path_split(path)
++    base_filename = filename.partition('.')[0]
+     return _path_join(head, base_filename + SOURCE_SUFFIXES[0])
+ 
+ 
+-- 
+2.6.4
+