gnuradio: add zeromq support

This patch adds support for sink/source GNURadio blocks to send/receive
zeromq data stream.

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gnuradio/Config.in

@@ -69,6 +69,13 @@ config BR2_PACKAGE_GNURADIO_UTILS
 	help
 	  Misc python utilities
 
+config BR2_PACKAGE_GNURADIO_ZEROMQ
+	bool "gr-zeromq support"
+	select BR2_PACKAGE_CPPZMQ
+	select BR2_PACKAGE_PYTHON_PYZMQ if BR2_PACKAGE_GNURADIO_PYTHON
+	help
+	  zeromq communication support
+
 comment "gr-fft, -filter, -analog, -channels, -digital, -trellis, -pager, -qtgui depends fftw's single precision"
 	depends on !BR2_PACKAGE_FFTW_PRECISION_SINGLE
 

package/gnuradio/gnuradio.mk

@@ -147,4 +147,14 @@ else
 GNURADIO_CONF_OPTS += -DENABLE_GR_UTILS=OFF
 endif
 
+ifeq ($(BR2_PACKAGE_GNURADIO_ZEROMQ),y)
+GNURADIO_DEPENDENCIES += cppzmq
+ifeq ($(BR2_PACKAGE_GNURADIO_PYTHON),y)
+GNURADIO_DEPENDENCIES += python-pyzmq
+endif
+GNURADIO_CONF_OPTS += -DENABLE_GR_ZEROMQ=ON
+else
+GNURADIO_CONF_OPTS += -DENABLE_GR_ZEROMQ=OFF
+endif
+
 $(eval $(cmake-package))