Add an option to disable bsddb

bsddb has an external dependency on Berkeley DB. Since we want to be
able to build Python without it, this patch adds an option to disable
the build/installation of this Python module.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>

---
 Makefile.pre.in |   10 ++++++++--
 configure.in    |   22 ++++++++++++++++++++++
 2 files changed, 30 insertions(+), 2 deletions(-)

Index: b/Makefile.pre.in
===================================================================
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -965,7 +965,7 @@
 		email email/mime \
 		ensurepip ensurepip/_bundled \
 		json \
-		logging bsddb csv importlib wsgiref \
+		logging csv importlib wsgiref \
 		ctypes ctypes/macholib \
 		idlelib idlelib/Icons \
 		distutils distutils/command \
@@ -981,7 +981,6 @@
 	test/tracedmodules \
 	email/test email/test/data \
 	json/tests \
-	bsddb/test \
 	ctypes/test \
 	idlelib/idle_test \
 	distutils/tests \
@@ -1022,6 +1021,11 @@
 LIBSUBDIRS += $(XMLLIBSUBDIRS)
 endif
 
+ifeq (@BSDDB@,yes)
+LIBSUBDIRS += bsddb
+TESTSUBDIRS += bsddb/test
+endif
+
 libinstall:	build_all $(srcdir)/Lib/$(PLATDIR) $(srcdir)/Modules/xxmodule.c
 	@for i in $(SCRIPTDIR) $(LIBDEST); \
 	do \
Index: b/configure.ac
===================================================================
--- a/configure.ac
+++ b/configure.ac
@@ -2656,6 +2656,28 @@
     	     DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} nis"
   	  fi])
 
+AC_ARG_ENABLE(dbm,
+	AS_HELP_STRING([--disable-dbm], [disable DBM]),
+	[ if test "$enableval" = "no"; then
+    	     DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} dbm"
+  	  fi])
+
+AC_ARG_ENABLE(gdbm,
+	AS_HELP_STRING([--disable-gdbm], [disable GDBM]),
+	[ if test "$enableval" = "no"; then
+    	     DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} gdbm"
+  	  fi])
+
+AC_SUBST(BSDDB)
+AC_ARG_ENABLE(bsddb,
+	AS_HELP_STRING([--disable-bsddb], [disable BerkeyleyDB]),
+	[ if test "$enableval" = "no"; then
+    	     BSDDB=no
+    	     DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} _bsddb"
+  	  else
+	     BSDDB=yes
+  	  fi], [ BSDDB=yes ])
+
 AC_ARG_ENABLE(unicodedata,
 	AS_HELP_STRING([--disable-unicodedata], [disable unicodedata]),
 	[ if test "$enableval" = "no"; then