[PATCH 1/4] python: Conditionally provide py3 argument to SWIG

[Tobias Mueller]

* lang/python/setup.py.in: Only call with -py3 when we run under python3
or higher.
--

If we ever remove the -builtin flag and leave the the -py3 flag, SWIG
will generate Python code which will be incompatible with Python 2,
because the py3 flag generates python3 code which is incompatible with
python2.

So we conditionally generate SWIG bindings with -py3.

Signed-off-by: Tobias Mueller <muelli at cryptobitch.de>
---
 lang/python/setup.py.in | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lang/python/setup.py.in b/lang/python/setup.py.in
index 9669c28..c7f981a 100755
--- a/lang/python/setup.py.in
+++ b/lang/python/setup.py.in
@@ -152,9 +152,10 @@ class BuildExtFirstHack(build):
         self.run_command('build_ext')
         build.run(self)
 
+py3 = [] if sys.version_info.major < 3 else ['-py3']
 swige = Extension("gpg._gpgme", ["gpgme.i", "helpers.c"],
-                  swig_opts = ['-py3', '-builtin', '-threads',
-                               '-outdir', 'gpg'] + extra_swig_opts,
+                  swig_opts = ['-threads', '-builtin',
+                               '-outdir', 'gpg'] + py3 + extra_swig_opts,
                   include_dirs = include_dirs,
                   define_macros = define_macros,
                   library_dirs = library_dirs,
-- 
2.7.4