From: Michael S. Tsirkin <mst@redhat.com>
Date: Tue, 15 Jan 2013 12:47:33 +0000 (+0200)
Subject: Makefile: clean timestamp generation rule
X-Git-Tag: Tizen_Studio_1.3_Release_p2.3.1~900^2~59^2~946^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6f329a55305c3b14da3c7b35f19379bae745e728;p=sdk%2Femulator%2Fqemu.git

Makefile: clean timestamp generation rule

create timestamp by rule without sideeffects.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

diff --git a/trace/Makefile.objs b/trace/Makefile.objs
index 27fe26b5c2..dde9d5784e 100644
--- a/trace/Makefile.objs
+++ b/trace/Makefile.objs
@@ -4,24 +4,24 @@
 # Auto-generated header for tracing routines
 
 $(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp
+	@cmp -s $< $@ || cp $< $@
 $(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
 	$(call quiet-command,$(TRACETOOL) \
 		--format=h \
 		--backend=$(TRACE_BACKEND) \
 		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
-	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
 
 ######################################################################
 # Auto-generated tracing routines (non-DTrace)
 
 ifneq ($(TRACE_BACKEND),dtrace)
 $(obj)/generated-tracers.c: $(obj)/generated-tracers.c-timestamp
+	@cmp -s $< $@ || cp $< $@
 $(obj)/generated-tracers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
 	$(call quiet-command,$(TRACETOOL) \
 		--format=c \
 		--backend=$(TRACE_BACKEND) \
 		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
-	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
 
 $(obj)/generated-tracers.o: $(obj)/generated-tracers.c $(obj)/generated-tracers.h
 endif