package/gdb: add support for host-gdb with python3

host-gdb was limited to link only with Python 2 although it's possible
to build Python 3 for host. Add the ability to link with Python 3.

Signed-off-by: Ramon Fried <rfried.dev@gmail.com>
[Thomas: add an option to the choice to not have Python support]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gdb/Config.in.host

@@ -32,10 +32,28 @@ config BR2_PACKAGE_HOST_GDB_TUI
 	help
 	  This option enables terminal user interface (TUI) for gdb
 
+choice
+	prompt "Python support"
+	default BR2_PACKAGE_HOST_GDB_NOPYTHON
+	help
+	  Select the version of Python you wish to use
+
+config BR2_PACKAGE_HOST_GDB_NOPYTHON
+	bool "None"
+	help
+	  This option disables Python support in the cross gdb.
+
 config BR2_PACKAGE_HOST_GDB_PYTHON
-	bool "Python support"
+	bool "Python 2"
 	help
-	  This option enables the Python support in the cross gdb.
+	  This option enables the Python 2 support in the cross gdb.
+
+config BR2_PACKAGE_HOST_GDB_PYTHON3
+	bool "Python 3"
+	help
+	  This option enables the Python 3 support in the cross gdb.
+
+endchoice
 
 config BR2_PACKAGE_HOST_GDB_SIM
 	bool "Simulator support"

package/gdb/gdb.mk

@@ -238,6 +238,9 @@ endif
 ifeq ($(BR2_PACKAGE_HOST_GDB_PYTHON),y)
 HOST_GDB_CONF_OPTS += --with-python=$(HOST_DIR)/bin/python2
 HOST_GDB_DEPENDENCIES += host-python
+else ifeq ($(BR2_PACKAGE_HOST_GDB_PYTHON3),y)
+HOST_GDB_CONF_OPTS += --with-python=$(HOST_DIR)/bin/python3
+HOST_GDB_DEPENDENCIES += host-python3
 else
 HOST_GDB_CONF_OPTS += --without-python
 endif