initial buildroot for linux 5.15

package/paho-mqtt-cpp/Config.in

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+config BR2_PACKAGE_PAHO_MQTT_CPP
+	bool "paho-mqtt-cpp"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::future
+	depends on BR2_INSTALL_LIBSTDCPP
+	select BR2_PACKAGE_PAHO_MQTT_C
+	help
+	  MQTT client C++ library
+
+	  https://eclipse.org/paho/clients/cpp/
+
+comment "paho-mqtt-cpp needs a toolchain w/ threads, C++"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735
+
+comment "paho-mqtt-cpp needs a toolchain not affected by GCC bug 64735"
+	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735

package/paho-mqtt-cpp/paho-mqtt-cpp.hash

@@ -0,0 +1,4 @@
+# Locally computed:
+sha256  435e97e4d5b1da13daa26cadd3e83fe9d154930abaa78b8ff1b8c854b5345d8b  paho-mqtt-cpp-1.2.0.tar.gz
+sha256  83bbba033dc985487e321b6dfde111772affb73460be48726299fed3da684b1c  edl-v10
+sha256  44277b2bec6093e4ac313afec251a4de599d24c4e768f8574d95b13a9d2d97b5  epl-v10

package/paho-mqtt-cpp/paho-mqtt-cpp.mk

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+################################################################################
+#
+# paho-mqtt-cpp
+#
+################################################################################
+
+PAHO_MQTT_CPP_VERSION = 1.2.0
+PAHO_MQTT_CPP_SITE = $(call github,eclipse,paho.mqtt.cpp,v$(PAHO_MQTT_CPP_VERSION))
+PAHO_MQTT_CPP_LICENSE = EPL-1.0 or BSD-3-Clause
+PAHO_MQTT_CPP_LICENSE_FILES = epl-v10 edl-v10
+PAHO_MQTT_CPP_INSTALL_STAGING = YES
+PAHO_MQTT_CPP_DEPENDENCIES = paho-mqtt-c
+
+ifeq ($(BR2_PACKAGE_OPENSSL),y)
+PAHO_MQTT_CPP_DEPENDENCIES += openssl
+PAHO_MQTT_CPP_CONF_OPTS += -DPAHO_WITH_SSL=TRUE
+else
+PAHO_MQTT_CPP_CONF_OPTS += -DPAHO_WITH_SSL=FALSE
+endif
+
+ifeq ($(BR2_SHARED_LIBS),y)
+PAHO_MQTT_CPP_CONF_OPTS += \
+	-DPAHO_BUILD_SHARED=TRUE \
+	-DPAHO_BUILD_STATIC=FALSE
+else ifeq ($(BR2_STATIC_LIBS),y)
+PAHO_MQTT_CPP_CONF_OPTS += \
+	-DPAHO_BUILD_SHARED=FALSE \
+	-DPAHO_BUILD_STATIC=TRUE
+else ifeq ($(BR2_SHARED_STATIC_LIBS),y)
+PAHO_MQTT_CPP_CONF_OPTS += \
+	-DPAHO_BUILD_SHARED=TRUE \
+	-DPAHO_BUILD_STATIC=TRUE
+endif
+
+$(eval $(cmake-package))