cpu/ppc4xx/config.mk: Make a needlessly deffered expansion immediate.
This will reduce the build time.
Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
diff --git a/cpu/ppc4xx/config.mk b/cpu/ppc4xx/config.mk
index 311c97b..baa97a4 100644
--- a/cpu/ppc4xx/config.mk
+++ b/cpu/ppc4xx/config.mk
@@ -25,7 +25,7 @@
PLATFORM_CPPFLAGS += -DCONFIG_4xx -ffixed-r2 -mstring -msoft-float
cfg=$(shell grep configs $(OBJTREE)/include/config.h | sed 's/.*<\(configs.*\)>/\1/')
-is440=$(shell grep CONFIG_440 $(TOPDIR)/include/$(cfg))
+is440:=$(shell grep CONFIG_440 $(TOPDIR)/include/$(cfg))
ifneq (,$(findstring CONFIG_440,$(is440)))
PLATFORM_CPPFLAGS += -Wa,-m440 -mcpu=440