[gentoo-portage-dev] [PATCH] setup.py: enable libc bindings optionally (bug 594744)

[Zac Medico]

Since the libc bindings don't support cross-compilation, add
an option to enable them conditially. The ebuild can use this
to enable the libc bindings by adding the following code to
the python_prepare_all function:

    if use native-extensions; then
        printf "[build_ext]\nportage-ext-modules=true" >> \
            setup.cfg || die
    fi

X-Gentoo-Bug: 594744
X-Gentoo-Bug-URL: https://bugs.gentoo.org/594744
---
 .travis.yml |  1 +
 setup.py    | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index c098c4d..ded5893 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ python:
 install: "pip install lxml"
 
 script:
+    - printf "[build_ext]\nportage-ext-modules=true" >> setup.cfg
     - ./setup.py test
     - ./setup.py install --root=/tmp/install-root
     # prevent repoman tests from trying to fetch metadata.xsd
diff --git a/setup.py b/setup.py
index e900aaa..e1d21a0 100755
--- a/setup.py
+++ b/setup.py
@@ -6,6 +6,7 @@ from __future__ import print_function
 
 from distutils.core import setup, Command, Extension
 from distutils.command.build import build
+from distutils.command.build_ext import build_ext as _build_ext
 from distutils.command.build_scripts import build_scripts
 from distutils.command.clean import clean
 from distutils.command.install import install
@@ -624,6 +625,24 @@ def get_manpages():
 				yield [os.path.join('$mandir', topdir, 'man%s' % g), mans]
 
 
+class build_ext(_build_ext):
+	user_options = _build_ext.user_options + [
+        ('portage-ext-modules', None,
+         "enable portage's C/C++ extensions (cross-compling is not supported)"),
+	]
+
+	boolean_options = _build_ext.boolean_options + [
+		'portage-ext-modules'
+	]
+
+	def initialize_options(self):
+		_build_ext.initialize_options(self)
+		self.portage_ext_modules = None
+
+	def run(self):
+		if self.portage_ext_modules:
+			_build_ext.run(self)
+
 setup(
 	name = 'portage',
 	version = '2.3.1',
@@ -651,6 +670,7 @@ setup(
 
 	cmdclass = {
 		'build': x_build,
+		'build_ext': build_ext,
 		'build_man': build_man,
 		'build_scripts': x_build_scripts,
 		'build_scripts_bin': x_build_scripts_bin,
-- 
2.7.4