From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de ([212.227.126.130]:54003 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932370AbcCRJwt (ORCPT ); Fri, 18 Mar 2016 05:52:49 -0400 From: Arnd Bergmann Subject: Re: [PATCH] ARC: build: Turn off -Wmaybe-uninitialized for ARC gcc 4.8 Date: Fri, 18 Mar 2016 10:52:12 +0100 Message-ID: <23667289.mNa1Q2STbY@wuerfel> In-Reply-To: <1458290783-31491-1-git-send-email-vgupta@synopsys.com> References: <1458290783-31491-1-git-send-email-vgupta@synopsys.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org, Claudiu Zissulescu , Michal Marek , Geert Uytterhoeven , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org On Friday 18 March 2016 14:16:23 Vineet Gupta wrote: > diff --git a/arch/arc/Makefile b/arch/arc/Makefile > index fed12f39d8ce..aeb101e8e674 100644 > --- a/arch/arc/Makefile > +++ b/arch/arc/Makefile > @@ -48,9 +48,14 @@ endif > upto_gcc44 := $(call cc-ifversion, -le, 0404, y) > atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y) > atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y) > +is_gcc48 := $(call cc-ifversion, -eq, 0408, y) > > cflags-$(atleast_gcc44) += -fsection-anchors > > +# gcc 4.8 spits out false positives for default -O3 > +# disable these for 4.8 and revisit when we upgrade to newer ver > +cflags-$(is_gcc48) += $(call cc-disable-warning,maybe-uninitialized,) > + > cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock > cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape Is this any better with gcc-4.9 or gcc-5? Maybe it's better to add the flag to the line that adds -O3 for consistency. We do the same thing for -Os in the global Makefile, as that triggers a similar load of warnings. Arnd