From patchwork Tue Jan 15 16:57:37 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 212252 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 004DE2C007E for ; Wed, 16 Jan 2013 03:54:14 +1100 (EST) Received: from localhost ([::1]:57098 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Tv9m9-0006oo-57 for incoming@patchwork.ozlabs.org; Tue, 15 Jan 2013 11:54:13 -0500 Received: from eggs.gnu.org ([208.118.235.92]:34184) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Tv9lk-0006aZ-9d for qemu-devel@nongnu.org; Tue, 15 Jan 2013 11:53:50 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Tv9lc-0006ot-M2 for qemu-devel@nongnu.org; Tue, 15 Jan 2013 11:53:48 -0500 Received: from mx1.redhat.com ([209.132.183.28]:20865) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Tv9lc-0006oo-EM for qemu-devel@nongnu.org; Tue, 15 Jan 2013 11:53:40 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r0FGrchF000318 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Tue, 15 Jan 2013 11:53:38 -0500 Received: from redhat.com ([10.35.212.26]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with SMTP id r0FGrae1027813 for ; Tue, 15 Jan 2013 11:53:37 -0500 Date: Tue, 15 Jan 2013 18:57:37 +0200 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mutt-Fcc: =sent X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 2/4] Makefile: clean timestamp generation rule X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org create timestamp by rule without sideeffects. Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi --- trace/Makefile.objs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/trace/Makefile.objs b/trace/Makefile.objs index 27fe26b..dde9d57 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