build: add jobserver support for host builds

SVN-Revision: 33423

include/host-build.mk

@@ -9,11 +9,17 @@ HOST_BUILD_DIR ?= $(BUILD_DIR_HOST)/$(PKG_NAME)$(if $(PKG_VERSION),-$(PKG_VERSIO
 HOST_INSTALL_DIR ?= $(HOST_BUILD_DIR)/host-install
 HOST_BUILD_PARALLEL ?=
 
+ifneq ($(CONFIG_PKG_BUILD_USE_JOBSERVER),)
+  HOST_MAKE_J:=$(if $(MAKE_JOBSERVER),$(MAKE_JOBSERVER) -j)
+else
+  HOST_MAKE_J:=-j$(CONFIG_PKG_BUILD_JOBS)
+endif
+
 ifeq ($(strip $(HOST_BUILD_PARALLEL)),0)
 HOST_JOBS?=-j1
 else
 HOST_JOBS?=$(if $(HOST_BUILD_PARALLEL)$(CONFIG_PKG_DEFAULT_PARALLEL),\
-	$(if $(CONFIG_PKG_BUILD_PARALLEL),-j$(CONFIG_PKG_BUILD_JOBS),-j1),-j1)
+	$(if $(CONFIG_PKG_BUILD_PARALLEL),$(HOST_MAKE_J),-j1),-j1)
 endif
 
 include $(INCLUDE_DIR)/host.mk