From a7e1fc80dc729018e806d6f3202c852c0d69cba7 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Wed, 22 Feb 2017 17:40:45 -0800
Subject: [PATCH] Add an option to disable expat

This patch replaces the existing --with-system-expat option with a
--with-expat={system,builtin,none} option, which allows to tell Python
whether we want to use the system expat (already installed), the expat
builtin the Python sources, or no expat at all (which disables the
installation of XML modules).

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
[ Andrey Smirnov: ported to Python 3.6 ]
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 Makefile.pre.in |  6 +++++-
 configure.ac    | 18 +++++++++++++-----
 setup.py        |  2 +-
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index 3621130..a9bdbde 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1205,7 +1205,7 @@ LIBSUBDIRS=	site-packages \
 		logging csv wsgiref urllib \
 		ctypes ctypes/macholib \
 		idlelib idlelib/Icons \
-		distutils distutils/command $(XMLLIBSUBDIRS) \
+		distutils distutils/command \
 		importlib \
 		turtledemo \
 		multiprocessing multiprocessing/dummy \
@@ -1268,6 +1268,10 @@ ifeq (@CURSES@,yes)
 LIBSUBDIRS += curses
 endif
 
+ifeq (@EXPAT@,yes)
+LIBSUBDIRS += $(XMLLIBSUBDIRS)
+endif
+
 ifeq (@LIB2TO3@,yes)
 LIBSUBDIRS += lib2to3 lib2to3/fixes lib2to3/pgen2
 TESTSUBDIRS += lib2to3/tests			\
diff --git a/configure.ac b/configure.ac
index 485f73c..a426b3a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2782,13 +2782,21 @@ PKG_PROG_PKG_CONFIG
 AC_SUBST(DISABLED_EXTENSIONS)
 
 # Check for use of the system expat library
-AC_MSG_CHECKING(for --with-system-expat)
-AC_ARG_WITH(system_expat,
-            AS_HELP_STRING([--with-system-expat], [build pyexpat module using an installed expat library]),
+AC_MSG_CHECKING(for --with-expat)
+AC_ARG_WITH(expat,
+            AS_HELP_STRING([--with-expat], [select which expat version to use: system, builtin, none]),
             [],
-            [with_system_expat="no"])
+            [with_expat="builtin"])
 
-AC_MSG_RESULT($with_system_expat)
+AC_MSG_RESULT($with_expat)
+
+if test "$with_expat" != "none"; then
+   EXPAT=yes
+else
+   DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} pyexpat"
+   EXPAT=no
+fi
+AC_SUBST(EXPAT)
 
 # Check for use of the system libffi library
 AC_MSG_CHECKING(for --with-system-ffi)
diff --git a/setup.py b/setup.py
index 80ec79b..660bbd7 100644
--- a/setup.py
+++ b/setup.py
@@ -1492,7 +1492,7 @@ class PyBuildExt(build_ext):
         #
         # More information on Expat can be found at www.libexpat.org.
         #
-        if '--with-system-expat' in sysconfig.get_config_var("CONFIG_ARGS"):
+        if '--with-expat=system' in sysconfig.get_config_var("CONFIG_ARGS"):
             expat_inc = []
             define_macros = []
             expat_lib = ['expat']
-- 
2.9.3