target/imagebuilder: use multi-thread support for xz compression

[openwrt/openwrt.git] / rules.mk

diff --git a/rules.mk b/rules.mk
index b140fbca7091633fbe48d00c69d1d1257414b4c1..f1ca735f2ed212c4675c9a99d4591b7d8ac9e4b9 100644 (file)
--- a/rules.mk
+++ b/rules.mk
@@ -70,6 +70,7 @@ TARGET_SUFFIX=$(call qstrip,$(CONFIG_TARGET_SUFFIX))
 BUILD_SUFFIX:=$(call qstrip,$(CONFIG_BUILD_SUFFIX))
 SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
 BUILD_SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
+NPROC:=$(shell sysctl -n hw.ncpu 2>/dev/null || nproc)
 export SHELL:=/usr/bin/env bash
 
 IS_PACKAGE_BUILD := $(if $(filter package/%,$(BUILD_SUBDIR)),1)