From 1f87d10e85aab16cb28b36799ad37aa85f3e361f Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Sat, 15 Sep 2012 10:21:24 +0000
Subject: build: add a config option for passing the top-level make jobserver
 to packages that have parallel build enabled, significantly improves
 parallelization and gets rid of CPU overcommit during intra-package parallel
 builds

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33414 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 include/package.mk  | 8 +++++++-
 include/toplevel.mk | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

(limited to 'include')

diff --git a/include/package.mk b/include/package.mk
index 64973b051..6b3617f77 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -15,11 +15,17 @@ PKG_MD5SUM ?= unknown
 PKG_BUILD_PARALLEL ?=
 PKG_INFO_DIR := $(STAGING_DIR)/pkginfo
 
+ifneq ($(CONFIG_PKG_BUILD_USE_JOBSERVER),)
+  MAKE_J:=$(MAKE_JOBSERVER)
+else
+  MAKE_J:=-j$(CONFIG_PKG_BUILD_JOBS)
+endif
+
 ifeq ($(strip $(PKG_BUILD_PARALLEL)),0)
 PKG_JOBS?=-j1
 else
 PKG_JOBS?=$(if $(PKG_BUILD_PARALLEL)$(CONFIG_PKG_DEFAULT_PARALLEL),\
-	$(if $(CONFIG_PKG_BUILD_PARALLEL),-j$(CONFIG_PKG_BUILD_JOBS),-j1),-j1)
+	$(if $(CONFIG_PKG_BUILD_PARALLEL),$(MAKE_J),-j1),-j1)
 endif
 
 include $(INCLUDE_DIR)/prereq.mk
diff --git a/include/toplevel.mk b/include/toplevel.mk
index d37ddb917..ba5af9c15 100644
--- a/include/toplevel.mk
+++ b/include/toplevel.mk
@@ -148,7 +148,7 @@ prereq:: prepare-tmpinfo .config
 			echo "WARNING: your configuration is out of sync. Please run make menuconfig, oldconfig or defconfig!"; \
 		fi \
 	)
-	@+$(SUBMAKE) -r $@
+	@+$(SUBMAKE) -r $@ MAKE_JOBSERVER="$(filter --jobserver% -j,$(MAKEFLAGS))"
 
 help:
 	cat README
-- 
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