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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB5373 Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH 1/2] mk: fix unsupported flag error on armhf architercture X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" > -----Original Message----- > From: Bruce Richardson > Sent: Monday, November 11, 2019 6:47 PM > To: Phil Yang (Arm Technology China) > Cc: dev@dpdk.org; thomas@monjalon.net; david.marchand@redhat.com; > jerinj@marvell.com; Honnappa Nagarahalli > ; Gavin Hu (Arm Technology China) > ; Joyce Kong (Arm Technology China) > ; nd ; stable@dpdk.org > Subject: Re: [dpdk-dev] [PATCH 1/2] mk: fix unsupported flag error on arm= hf > architercture >=20 > On Mon, Nov 11, 2019 at 06:34:20PM +0800, Phil Yang wrote: > > The older version (e.g. version 7.4.0 ) of GNU C compiler for the armhf > > architecture doesn't support the flag '-Wno-address-of-packed-member', > > so remove this flag for aarch32. > > > > Fixes: a385972c3675 ("mk: disable warning for packed member pointer") > > Cc: stable@dpdk.org > > > > Signed-off-by: Phil Yang > > Reviewed-by: Gavin Hu > > Tested-by: Joyce Kong > > > > --- > > mk/toolchain/gcc/rte.vars.mk | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.m= k > > index 9fc7041..ec0cbbf 100644 > > --- a/mk/toolchain/gcc/rte.vars.mk > > +++ b/mk/toolchain/gcc/rte.vars.mk > > @@ -100,7 +100,9 @@ WERROR_FLAGS +=3D -Wno-format-truncation > > endif > > > > # disable packed member unalign warnings > > +ifneq ($(CONFIG_RTE_ARCH_ARM), y) > > WERROR_FLAGS +=3D -Wno-address-of-packed-member > > +endif > > > You don't need to do this, as gcc will not complain about this unknown fl= ag > unless you have other issues in your code.[1] I think it's better to keep= the > code clean in this case, otherwise we'll have the code littered with > conditionals for various flags. >=20 > /Bruce >=20 > [1] https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html > "When an unrecognized warning option is requested (e.g., > -Wunknown-warning), GCC emits a diagnostic stating that the option is not > recognized. However, if the -Wno- form is used, the behavior is slightly > different: no diagnostic is produced for -Wno-unknown-warning unless othe= r > diagnostics are being produced. This allows the use of new -Wno- options > with old compilers, but if something goes wrong, the compiler warns that = an > unrecognized option is present." Thanks, Bruce.=20 There are thousands of warnings with alignment when compiling for ARMv7 (AR= Mv7 supports unaligned memory access). Without this new flag, the build system works fine for ARMv7. So I add thi= s conditional for ARMv7 only. I agree with you we should clean up the code, but it needs a lot of effort = to achieve that.=20 This patch is going to make the ARMv7 target build successfully during this= period. Thanks, Phil