deps_builder: Optionally build boost::python

This this adds the option of building boost::python
in the libs builder, in preparation for future
dependencies that require it (ie pyopenvdb)

disabled by default, can be enabled with the
`WITH_BOOST_PYTHON` cmake option.

Differential Revision: https://developer.blender.org/D8212

Reviewed by: brecht

build_files/build_environment/CMakeLists.txt

@@ -57,7 +57,6 @@ include(cmake/zlib.cmake)
 include(cmake/openal.cmake)
 include(cmake/png.cmake)
 include(cmake/jpeg.cmake)
-include(cmake/boost.cmake)
 include(cmake/blosc.cmake)
 include(cmake/pthreads.cmake)
 include(cmake/openexr.cmake)
@@ -89,6 +88,8 @@ include(cmake/python_site_packages.cmake)
 include(cmake/package_python.cmake)
 include(cmake/numpy.cmake)
 include(cmake/usd.cmake)
+# Boost needs to be included after python.cmake due to the PYTHON_BINARY variable being needed.
+include(cmake/boost.cmake)
 if(UNIX)
   # Rely on PugiXML compiled with OpenImageIO
 else()

build_files/build_environment/cmake/boost.cmake

@@ -49,6 +49,15 @@ else()
   endif()
 endif()
 
+if(WITH_BOOST_PYTHON)
+  set(JAM_FILE ${BUILD_DIR}/boost.user-config.jam)
+  configure_file(${PATCH_DIR}/boost.user.jam.in ${JAM_FILE})
+  set(BOOST_PYTHON_OPTIONS
+    --with-python
+    --user-config=${JAM_FILE}
+  )
+endif()
+
 set(BOOST_OPTIONS
   --with-filesystem
   --with-locale
@@ -65,6 +74,7 @@ set(BOOST_OPTIONS
   -sNO_LZMA=1
   -sNO_ZSTD=1
   ${BOOST_TOOLSET}
+  ${BOOST_PYTHON_OPTIONS}
 )
 
 string(TOLOWER ${BUILD_MODE} BOOST_BUILD_TYPE)
@@ -81,3 +91,11 @@ ExternalProject_Add(external_boost
   BUILD_IN_SOURCE 1
   INSTALL_COMMAND "${BOOST_HARVEST_CMD}"
 )
+
+if(WITH_BOOST_PYTHON)
+  add_dependencies(
+    external_boost
+    external_python
+    external_numpy
+  )
+endif()

build_files/build_environment/cmake/options.cmake

@@ -20,6 +20,7 @@ if(WIN32)
   option(ENABLE_MINGW64 "Enable building of ffmpeg/iconv/libsndfile/fftw3 by installing mingw64" ON)
 endif()
 option(WITH_WEBP "Enable building of oiio with webp support" OFF)
+option(WITH_BOOST_PYTHON "Enable building of boost with python support" OFF)
 set(MAKE_THREADS 1 CACHE STRING "Number of threads to run make with")
 
 if(NOT BUILD_MODE)

build_files/build_environment/patches/boost.user.jam.in

@@ -0,0 +1,4 @@
+using python : @PYTHON_SHORT_VERSION@ : @PYTHON_BINARY@
+ : @LIBDIR@/python/include @LIBDIR@/python/include/python@PYTHON_SHORT_VERSION@m/ 
+ : @LIBDIR@/python/libs  
+;