large improvement for parallel builds. works without V=99 now and without warnings. tested with -j on an 2x dual core opteron machine

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11414 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 6 insertions, 5 deletions

diff --git a/rules.mk b/rules.mk
index a88295ecd..6d6dab09b 100644
--- a/rules.mk
+++ b/rules.mk
@@ -23,6 +23,12 @@ $(strip $(subst ",,$(1)))
 endef
 #"))
 
+empty:=
+space:= $(empty) $(empty)
+merge=$(subst $(space),,$(1))
+confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
+
+_SINGLE=MAKEFLAGS=$(space)
 ARCH:=$(call qstrip,$(shell echo $(CONFIG_ARCH) | sed -e 's/i[3-9]86/i386/'))
 BOARD:=$(call qstrip,$(CONFIG_TARGET_BOARD))
 TARGET_OPTIMIZATION:=$(call qstrip,$(CONFIG_TARGET_OPTIMIZATION))
@@ -145,11 +151,6 @@ $(call shvar,$(1))=$$(call $(1))
 export $(call shvar,$(1))
 endef
 
-empty:=
-space:= $(empty) $(empty)
-merge=$(subst $(space),,$(1))
-confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
-
 # file extension
 ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))