boost: enable boost-atomic

It was disabled in february 2013 by commit
e5434583badf1abf4a4620efa76452638ad9e177
because did not build correctly with ucLibc at the time.

It now builds correctly with both uClibc v0.9.33 and uClibc-ng.

Signed-off-by: Noé Rubinstein <nrubinstein@aldebaran.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/boost/Config.in

@@ -50,6 +50,9 @@ config BR2_PACKAGE_BOOST_LAYOUT
 	default "tagged" if BR2_PACKAGE_BOOST_LAYOUT_TAGGED
 	default "versioned" if BR2_PACKAGE_BOOST_LAYOUT_VERSIONED
 
+config BR2_PACKAGE_BOOST_ATOMIC
+	bool "boost-atomic"
+
 config BR2_PACKAGE_BOOST_CHRONO
 	bool "boost-chrono"
 

package/boost/boost.mk

@@ -23,11 +23,11 @@ HOST_BOOST_FLAGS = --without-icu \
 	iostreams locale log math mpi program_options python random regex \
 	serialization signals system test thread timer wave)
 
-# 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
+BOOST_WITHOUT_FLAGS = coroutine log
 
+BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_ATOMIC),,atomic)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_CHRONO),,chrono)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_CONTEXT),,context)
 BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_DATE_TIME),,date_time)