dev-python/pycparser: Backport upstream -OO patch, #628386

dev-python/pycparser/files/pycparser-2.18-OO.patch

@@ -0,0 +1,56 @@
+From 673accec311a027c22b0718d753f8da922915305 Mon Sep 17 00:00:00 2001
+From: Eli Bendersky <eliben@gmail.com>
+Date: Thu, 13 Jul 2017 20:25:29 -0700
+Subject: [PATCH] Address an import of pycparser in -OO mode.
+
+In this mode there are no docstrings; we don't want an instantiation of CParser
+to fail, though it won't actually work correctly if used.
+
+See #197 and #198
+---
+ pycparser/plyparser.py | 21 +++++++++++++++++++--
+ 1 file changed, 19 insertions(+), 2 deletions(-)
+
+diff --git a/pycparser/plyparser.py b/pycparser/plyparser.py
+index af91922..b6640fa 100644
+--- a/pycparser/plyparser.py
++++ b/pycparser/plyparser.py
+@@ -8,6 +8,7 @@
+ # License: BSD
+ #-----------------------------------------------------------------
+ 
++import warnings
+ 
+ class Coord(object):
+     """ Coordinates of a syntactic element. Consists of:
+@@ -87,12 +88,28 @@ def template(cls):
+ 
+     See `parameterized` for more information on parameterized rules.
+     """
++    issued_nodoc_warning = False
+     for attr_name in dir(cls):
+         if attr_name.startswith('p_'):
+             method = getattr(cls, attr_name)
+             if hasattr(method, '_params'):
+-                delattr(cls, attr_name)  # Remove template method
+-                _create_param_rules(cls, method)
++                # Remove the template method
++                delattr(cls, attr_name)
++                # Create parameterized rules from this method; only run this if
++                # the method has a docstring. This is to address an issue when
++                # pycparser's users are installed in -OO mode which strips
++                # docstrings away.
++                # See: https://github.com/eliben/pycparser/pull/198/ and
++                #      https://github.com/eliben/pycparser/issues/197
++                # for discussion.
++                if method.__doc__ is not None:
++                    _create_param_rules(cls, method)
++                elif not issued_nodoc_warning:
++                    warnings.warn(
++                        'parsing methods must have __doc__ for pycparser to work properly',
++                        RuntimeWarning,
++                        stacklevel=2)
++                    issued_nodoc_warning = True
+     return cls
+ 
+ 

dev-python/pycparser/pycparser-2.18-r1.ebuild

@@ -21,6 +21,10 @@ DEPEND="${RDEPEND}
 	dev-python/setuptools[${PYTHON_USEDEP}]
 	test? ( dev-python/nose[${PYTHON_USEDEP}] )"
 
+PATCHES=(
+	"${FILESDIR}"/pycparser-2.18-OO.patch
+)
+
 python_prepare_all() {
 	# remove the original files to guarantee their regen
 	rm pycparser/{c_ast,lextab,yacctab}.py || die