kamailio-5.x: add app_python3

Adds the Python 3 module. Patch is required because otherwise the
module's Makefile tries to get the includes from host python.

The patch also adds "--embed" to the python-config call that discovers
LDFLAGS as otherwise the python lib is not linked into the module.

Patch has been accepted upstream already.

Adding PYTHON3 to MAKE_VARS tells the Makefile which python to use.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

net/kamailio-5.x/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=kamailio5
 PKG_VERSION:=5.3.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=https://www.kamailio.org/pub/kamailio/$(PKG_VERSION)/src
 PKG_SOURCE:=kamailio-$(PKG_VERSION)$(PKG_VARIANT)_src.tar.gz
@@ -33,6 +33,7 @@ MODULES_AVAILABLE:= \
 	app_jsdt \
 	app_lua \
 	app_lua_sr \
+	app_python3 \
 	app_ruby \
 	app_sqlang \
 	async \
@@ -231,6 +232,7 @@ PKG_CONFIG_DEPENDS:= \
 
 include $(INCLUDE_DIR)/nls.mk
 include $(INCLUDE_DIR)/package.mk
+include $(TOPDIR)/feeds/packages/lang/python/python3-version.mk
 
 # Build reproducibly
 TARGET_CFLAGS += -DVERSION_NODATE=1
@@ -420,6 +422,9 @@ MAKE_FLAGS += \
 	quiet=verbose \
 	run_prefix=""
 
+MAKE_VARS += \
+	PYTHON3=python$(PYTHON3_VERSION)
+
 define Build/Configure
 endef
 
@@ -451,6 +456,7 @@ $(eval $(call BuildKamailio5Module,alias_db,Database-backend aliases,,))
 $(eval $(call BuildKamailio5Module,app_jsdt,Execute JavaScript scripts,,))
 $(eval $(call BuildKamailio5Module,app_lua,Execute embedded Lua scripts,,+liblua))
 $(eval $(call BuildKamailio5Module,app_lua_sr,Old Lua API,,+kamailio5-mod-app-lua,))
+$(eval $(call BuildKamailio5Module,app_python3,Python3 scripting interpreter,,+python3-light))
 $(eval $(call BuildKamailio5Module,app_ruby,Ruby scripting interpreter,,+libruby))
 $(eval $(call BuildKamailio5Module,app_sqlang,Execute Squirrel language scripts,,+libstdcpp))
 $(eval $(call BuildKamailio5Module,async,Asynchronous SIP handling functions,,+kamailio5-mod-tm +kamailio5-mod-tmx))

net/kamailio-5.x/patches/150-python3-cross-compile.patch

@@ -0,0 +1,54 @@
+commit 05af36d34aa2668780aa111878206c6797fa98b0
+Author: Sebastian Kemper <sebastian_ml@gmx.net>
+Date:   Sun Apr 12 09:37:48 2020 +0200
+
+    app_python3: update Python3 detection mechanism
+    
+    This commit
+    
+      - removes the python calls whose output is never actually used.
+    
+      - changes the include discovery to use python3(.x)-config. This is
+        preferable because it also works for cross-compiling. Calling
+        python3(.x) directly will always provide host flags, which for
+        cross-compiling is not feasible.
+    
+      - updates LDFLAGS discovery to also work with >= Python 3.8. To
+        achieve this python3(.x)-config is first run with the argument
+        "--embed". If this does not succeed (exit status 1)
+        python3(.x)-config is run again without "--embed". This is the
+        method suggested by Python upstream to provide backwards
+        compatibility. See [1] for more details.
+    
+    [1] https://docs.python.org/3/whatsnew/3.8.html
+    
+    Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
+
+diff --git a/src/modules/app_python3/Makefile b/src/modules/app_python3/Makefile
+index 1c9ff1c6b6..d31cd6ab10 100644
+--- a/src/modules/app_python3/Makefile
++++ b/src/modules/app_python3/Makefile
+@@ -11,18 +11,16 @@ NAME=app_python3.so
+ # but no testing has been done with that.
+ PYTHON3?=python3
+ 
+-PYTHON3_VERSION=${shell ${PYTHON3} -c "import distutils.sysconfig;print(distutils.sysconfig.get_config_var('VERSION'))"}
+-PYTHON3_LIBDIR=${shell ${PYTHON3} -c "import distutils.sysconfig;print(distutils.sysconfig.get_config_var('LIBDIR'))"}
+-PYTHON3_LDFLAGS=${shell ${PYTHON3} -c "import distutils.sysconfig;print(distutils.sysconfig.get_config_var('LINKFORSHARED'))"}
+-PYTHON3_INCDIR=${shell ${PYTHON3} -c "import distutils.sysconfig;print(distutils.sysconfig.get_python_inc())"}
+-
+-LIBS=${shell ${PYTHON3}-config --ldflags}
++LIBS=${shell \
++	tmp_py3_libs=$$(${PYTHON3}-config --ldflags --embed 2>/dev/null) || \
++	tmp_py3_libs=$$(${PYTHON3}-config --ldflags); \
++	echo $$tmp_py3_libs}
+ 
+ ifeq ($(OS), freebsd)
+ LIBS+=-pthread
+ endif
+ 
+-DEFS+=-I${PYTHON3_INCDIR}
++DEFS+=${shell ${PYTHON3}-config --includes}
+ 
+ include ../../Makefile.modules
+