Yocto 1.6 no libboost_log in toolchain - boost

Question

I've installed Yocto 1.6 and run the bitbake to set up the toolchain, following the tutorial written by Daiane Angolini. While I see most of the boost libraries under $SDKTARGETSYSROOT/usr/lib, there seems to be no libboost_log.a nor libboost_log_setup.a. I believe these were introduced with Boost 1.55, and that Yocto 1.6 has moved to Boost 1.55. Shouldn't they be there, or have I done something wrong?
My .../fsl-community-bsp/build/conf/local.conf:
BB_NUMBER_THREADS ?= "${#oe.utils.cpu_count()}"
PARALLEL_MAKE ?= "-j ${#oe.utils.cpu_count()}"
MACHINE ??= 'imx6qsabresd'
DISTRO ?= 'poky'
PACKAGE_CLASSES ?= "package_rpm"
EXTRA_IMAGE_FEATURES = "debug-tweaks tools-sdk"
USER_CLASSES ?= "buildstats image-mklibs image-prelink"
PATCHRESOLVE = "noop"
BB_DISKMON_DIRS = "\
STOPTASKS,${TMPDIR},1G,100K \
STOPTASKS,${DL_DIR},1G,100K \
STOPTASKS,${SSTATE_DIR},1G,100K \
ABORT,${TMPDIR},100M,1K \
ABORT,${DL_DIR},100M,1K \
ABORT,${SSTATE_DIR},100M,1K"
PACKAGECONFIG_pn-qemu-native = "sdl"
PACKAGECONFIG_pn-nativesdk-qemu = "sdl"
ASSUME_PROVIDED += "libsdl-native"
CONF_VERSION = "1"
BB_NUMBER_THREADS = '1'
PARALLEL_MAKE = '-j 1'
DL_DIR ?= "${BSPDIR}/downloads/"
ACCEPT_FSL_EULA = ""
CORE_IMAGE_EXTRA_INSTALL += "boost"

Answer 1

The right way is to extend the existing recipe. In fact, you normally never change a 3rd-party recipe directly. This means, you are creating your own "recipes-support/boost/" folder which includes a file called "boost_%.bbappend".
'%' means that the boost version is not of interest. 'bbappend' means that you extend the existing boost-recipe. This file contains only one line:
BOOST_LIBS += " log"

Answer 2

In order to add log library you should edit boost recipe file.
In this example you should edit boost.inc.
To add log, atomic and loace libraries, replace
BOOST_LIBS = "\
date_time \
filesystem \
graph \
iostreams \
program_options \
regex \
serialization \
signals \
system \
test \
thread \
"
with
BOOST_LIBS = "\
date_time \
filesystem \
graph \
iostreams \
program_options \
regex \
serialization \
signals \
system \
test \
thread \
log \
atomic \
locale
"