Turn-off implicit GNU Make RC/SCCS rules

This small patch prevents GNU Make from stating RCS and SCCS
specific files on the filesystem. This makes the output of
"make -d" slightly more readable, and also reduces the no-change
time on AOSP master by a bit less than a second on average.

Change-Id: Ifa50ace32e8689717956d7247b0d6f53ef72b7a1

diff --git a/core/main.mk b/core/main.mk
index ffdc16a..1df662a 100644 (file)
--- a/core/main.mk
+++ b/core/main.mk
@@ -12,6 +12,13 @@ endif
 # this turns off the suffix rules built into make
 .SUFFIXES:
 
+# this turns off the RCS / SCCS implicit rules of GNU Make
+% : RCS/%,v
+% : RCS/%
+% : %,v
+% : s.%
+% : SCCS/s.%
+
 # If a rule fails, delete $@.
 .DELETE_ON_ERROR:
 
@@ -429,7 +436,7 @@ endif
 else   # !SDK_ONLY
 ifeq ($(BUILD_TINY_ANDROID), true)
 
-# TINY_ANDROID is a super-minimal build configuration, handy for board 
+# TINY_ANDROID is a super-minimal build configuration, handy for board
 # bringup and very low level debugging
 
 subdirs := \