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Thu, 4 Jun 2020 05:08:34 +0000 (UTC) Subject: Re: [PATCH] configure: Disable -Wtautological-type-limit-compare To: Richard Henderson , qemu-devel@nongnu.org References: <20200604034513.75103-1-richard.henderson@linaro.org> From: Thomas Huth Openpgp: preference=signencrypt Message-ID: <962eb77e-4e9c-e680-645c-2705d9dff7b7@redhat.com> Date: Thu, 4 Jun 2020 07:08:32 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200604034513.75103-1-richard.henderson@linaro.org> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=205.139.110.61; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/04 01:08:38 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: QEMU Trivial Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 04/06/2020 05.45, Richard Henderson wrote: > Clang 10 enables this by default with -Wtype-limit. > > All of the instances flagged by this Werror so far have been > cases in which we really do want the compiler to optimize away > the test completely. Disabling the warning will avoid having > to add ifdefs to work around this. > > Signed-off-by: Richard Henderson > --- > configure | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/configure b/configure > index f087d2bcd1..693f01327f 100755 > --- a/configure > +++ b/configure > @@ -2009,6 +2009,8 @@ gcc_flags="-Wno-missing-include-dirs -Wempty-body -Wnested-externs $gcc_flags" > gcc_flags="-Wendif-labels -Wno-shift-negative-value $gcc_flags" > gcc_flags="-Wno-initializer-overrides -Wexpansion-to-defined $gcc_flags" > gcc_flags="-Wno-string-plus-int -Wno-typedef-redefinition $gcc_flags" > +gcc_flags="$gcc_flags -Wno-tautological-type-limit-compare" > + > # Note that we do not add -Werror to gcc_flags here, because that would > # enable it for all configure tests. If a configure test failed due > # to -Werror this would just silently disable some features, Acked-by: Thomas Huth