boost: make build with python an option

Add an option to boost to build the Boost.Python library.
http://www.boost.org/doc/libs/1_55_0/libs/python/doc/index.html

Signed-off-by: Johan Derycke <johan.derycke@barco.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/boost/Config.in

@@ -94,6 +94,10 @@ config BR2_PACKAGE_BOOST_MPI
 config BR2_PACKAGE_BOOST_PROGRAM_OPTIONS
 	bool "boost-program_options"
 
+config BR2_PACKAGE_BOOST_PYTHON
+	depends on BR2_PACKAGE_PYTHON || BR2_PACKAGE_PYTHON3
+	bool "boost-python"
+
 config BR2_PACKAGE_BOOST_RANDOM
 	bool "boost-random"
 

package/boost/boost.mk

@@ -26,7 +26,7 @@ HOST_BOOST_FLAGS = --without-icu \
 # atomic library compile only with upstream version, wait for next release
 # coroutine breaks on some weak toolchains and it's new for 1.54+
 # log breaks with some toolchain combinations and it's new for 1.54+
-BOOST_WITHOUT_FLAGS = atomic coroutine log python
+BOOST_WITHOUT_FLAGS = atomic coroutine log
 
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_CHRONO),,chrono)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_CONTEXT),,context)
@@ -40,6 +40,7 @@ BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_LOCALE),,locale)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_MATH),,math)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_MPI),,mpi)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_PROGRAM_OPTIONS),,program_options)
+BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_PYTHON),,python)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_RANDOM),,random)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_REGEX),,regex)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_SERIALIZATION),,serialization)
@@ -50,6 +51,8 @@ BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_THREAD),,thread)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_TIMER),,timer)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_WAVE),,wave)
 
+BOOST_TARGET_CXXFLAGS = $(TARGET_CXXFLAGS)
+
 ifeq ($(BR2_PACKAGE_ICU),y)
 BOOST_FLAGS += --with-icu=$(STAGING_DIR)/usr
 BOOST_DEPENDENCIES += icu
@@ -61,6 +64,19 @@ ifeq ($(BR2_PACKAGE_BOOST_IOSTREAMS),y)
 BOOST_DEPENDENCIES += bzip2 zlib
 endif
 
+ifeq ($(BR2_PACKAGE_BOOST_PYTHON),y)
+BOOST_FLAGS += --with-python-root=$(HOST_DIR)
+ifeq ($(BR2_PACKAGE_PYTHON3),y)
+BOOST_FLAGS += --with-python=$(HOST_DIR)/usr/bin/python$(PYTHON3_VERSION_MAJOR)
+BOOST_TARGET_CXXFLAGS += -I$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR)m
+BOOST_DEPENDENCIES += python3
+else
+BOOST_FLAGS += --with-python=$(HOST_DIR)/usr/bin/python$(PYTHON_VERSION_MAJOR)
+BOOST_TARGET_CXXFLAGS += -I$(STAGING_DIR)/usr/include/python$(PYTHON_VERSION_MAJOR)
+BOOST_DEPENDENCIES += python
+endif
+endif
+
 HOST_BOOST_OPT += toolset=gcc threading=multi variant=release link=shared \
 	runtime-link=shared
 
@@ -85,7 +101,7 @@ BOOST_LAYOUT = $(call qstrip, $(BR2_PACKAGE_BOOST_LAYOUT))
 
 define BOOST_CONFIGURE_CMDS
 	(cd $(@D) && ./bootstrap.sh $(BOOST_FLAGS))
-	echo "using gcc : $(TARGET_CC_VERSION) : $(TARGET_CXX) : <cxxflags>\"$(TARGET_CXXFLAGS)\" <linkflags>\"$(TARGET_LDFLAGS)\" ;" > $(@D)/user-config.jam
+	echo "using gcc : $(TARGET_CC_VERSION) : $(TARGET_CXX) : <cxxflags>\"$(BOOST_TARGET_CXXFLAGS)\" <linkflags>\"$(TARGET_LDFLAGS)\" ;" > $(@D)/user-config.jam
 	echo "" >> $(@D)/user-config.jam
 endef