python: use default host build prefix, remove cross-compile workarounds for host

The sets host Python's prefix and exec-prefix to the same value
($(STAGING_DIR)/host for packages, as currently defined in
include/host-build.mk), which avoids the case where pyconfig.h is
not in the same location as Python's other header files (see
https://bugs.python.org/issue896330).

This also removes some cross compilation workarounds
(_python_sysroot/prefix/exec_prefix, disabling byte-compilation,
__PYVENV_LAUNCHER__) that are not necessary when compiling packages
for host.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2015 OpenWrt.org
+# Copyright (C) 2006-2016 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -12,7 +12,7 @@ include ./files/python-package.mk
 
 PKG_NAME:=python
 PKG_VERSION:=$(PYTHON_VERSION).$(PYTHON_VERSION_MICRO)
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=Python-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://www.python.org/ftp/python/$(PKG_VERSION)
@@ -144,7 +144,7 @@ define Build/InstallDev
 		$(PKG_INSTALL_DIR)/usr/include/python$(PYTHON_VERSION) \
 		$(1)/usr/include/
 	$(CP) \
-		$(STAGING_DIR)/host/usr/lib/python$(PYTHON_VERSION) \
+		$(STAGING_DIR)/host/lib/python$(PYTHON_VERSION) \
 		$(PKG_INSTALL_DIR)/usr/lib/libpython$(PYTHON_VERSION).so* \
 		$(1)/usr/lib/
 	$(CP) \
@@ -221,7 +221,6 @@ HOST_CONFIGURE_ARGS+= \
 	--without-cxx-main \
 	--without-pymalloc \
 	--with-threads \
-	--prefix=$(STAGING_DIR)/host/usr \
 	--with-system-expat=$(STAGING_DIR)/host \
 	--with-ensurepip=upgrade \
 	CONFIG_SITE= \

lang/python/files/python-host.mk

@@ -1,38 +1,36 @@
 #
-# Copyright (C) 2015 OpenWrt.org
+# Copyright (C) 2015-2016 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
 #
 
-HOST_PYTHON_INC_DIR:=$(STAGING_DIR)/host/usr/include/python$(PYTHON_VERSION)
+HOST_PYTHON_DIR:=$(STAGING_DIR)/host
+HOST_PYTHON_INC_DIR:=$(HOST_PYTHON_DIR)/include/python$(PYTHON_VERSION)
+HOST_PYTHON_LIB_DIR:=$(HOST_PYTHON_DIR)/lib/python$(PYTHON_VERSION)
 
-HOST_PYTHON_PKG_DIR:=/usr/lib/python$(PYTHON_VERSION)/site-packages
+HOST_PYTHON_PKG_DIR:=/lib/python$(PYTHON_VERSION)/site-packages
+
+HOST_PYTHON_BIN:=$(HOST_PYTHON_DIR)/bin/python$(PYTHON_VERSION)
 
 HOST_PYTHONPATH:=$(HOST_PYTHON_LIB_DIR):$(STAGING_DIR)/host/$(HOST_PYTHON_PKG_DIR)
+
 define HostPython
 	if [ "$(strip $(3))" == "HOST" ]; then \
 		export PYTHONPATH="$(HOST_PYTHONPATH)"; \
-		export _python_sysroot="$(STAGING_DIR)/host"; \
+		export PYTHONDONTWRITEBYTECODE=0; \
 	else \
 		export PYTHONPATH="$(PYTHONPATH)"; \
+		export PYTHONDONTWRITEBYTECODE=1; \
 		export _python_sysroot="$(STAGING_DIR)"; \
+		export _python_prefix="/usr"; \
+		export _python_exec_prefix="/usr"; \
 	fi; \
 	export PYTHONOPTIMIZE=""; \
-	export PYTHONDONTWRITEBYTECODE=1; \
-	export _python_prefix="/usr"; \
-	export _python_exec_prefix="/usr"; \
 	$(1) \
 	$(HOST_PYTHON_BIN) $(2);
 endef
 
-# These configure args are needed in detection of path to Python header files
-# using autotools.
-HOST_CONFIGURE_ARGS += \
-	_python_sysroot="$(STAGING_DIR)/host" \
-	_python_prefix="/usr" \
-	_python_exec_prefix="/usr"
-
 # $(1) => build subdir
 # $(2) => additional arguments to setup.py
 # $(3) => additional variables
@@ -48,7 +46,6 @@ define Build/Compile/HostPyMod
 		CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON_INC_DIR)" \
 		LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON_VERSION)" \
 		_PYTHON_HOST_PLATFORM=linux2 \
-		__PYVENV_LAUNCHER__="/usr/bin/$(PYTHON)" \
 		$(3) \
 		, \
 		./setup.py $(2) \

lang/python/files/python-package.mk

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2015 OpenWrt.org
+# Copyright (C) 2006-2016 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -17,9 +17,6 @@ PYTHON_PKG_DIR:=/usr/lib/python$(PYTHON_VERSION)/site-packages
 
 PYTHON:=python$(PYTHON_VERSION)
 
-HOST_PYTHON_LIB_DIR:=$(STAGING_DIR)/host/usr/lib/python$(PYTHON_VERSION)
-HOST_PYTHON_BIN:=$(STAGING_DIR)/host/bin/python2
-
 PYTHONPATH:=$(PYTHON_LIB_DIR):$(STAGING_DIR)/$(PYTHON_PKG_DIR):$(PKG_INSTALL_DIR)/$(PYTHON_PKG_DIR)
 
 # These configure args are needed in detection of path to Python header files