another optimization

SVN-Revision: 5507

Makefile

@@ -21,10 +21,15 @@ SHELL:=/usr/bin/env bash
 export LC_ALL=C
 export LANG=C
 export TOPDIR=${shell pwd}
-include $(TOPDIR)/include/verbose.mk
 ifeq ($(KBUILD_VERBOSE),99)
   MAKE:=3>/dev/null $(MAKE)
 endif
+ifneq ($(shell tty -s <&3 || echo x),x)
+  IS_TTY=1
+  export IS_TTY
+endif
+
+include $(TOPDIR)/include/verbose.mk
 
 OPENWRTVERSION:=$(RELEASE)
 ifneq ($(VERSION),)

include/verbose.mk

@@ -18,7 +18,7 @@ ifeq ("$(origin V)", "command line")
   KBUILD_VERBOSE:=$(V)
 endif
 
-ifneq ($(shell tty -s <&3 || echo x),x)
+ifeq ($(IS_TTY),1)
   _Y:="\\33[33m"# yellow
   _N:="\\33[m"#	normal
 endif