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X-MS-Exchange-CrossTenant-Network-Message-Id: 87f8a603-ddb1-465e-f6da-08d6462661f6 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.60.83];Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN4PR0201MB3520 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08. 11. 18 16:01, Nathan Chancellor wrote: > On Thu, Nov 08, 2018 at 07:45:42AM +0100, Michal Simek wrote: >> On 07. 11. 18 18:48, Nick Desaulniers wrote: >>> On Wed, Nov 7, 2018 at 1:01 AM Michal Simek wrote: >>>> >>>> On 07. 11. 18 9:55, Nathan Chancellor wrote: >>>>> On Wed, Nov 07, 2018 at 09:46:12AM +0100, Michal Simek wrote: >>>>>> On 01. 11. 18 1:57, Nathan Chancellor wrote: >>>>>>> Clang warns when one enumerated type is implicitly converted to another: >>>>>>> >>>>>>> drivers/pinctrl/pinctrl-zynq.c:985:18: warning: implicit conversion from >>>>>>> enumeration type 'enum zynq_pin_config_param' to different enumeration >>>>>>> type 'enum pin_config_param' [-Wenum-conversion] >>>>>>> {"io-standard", PIN_CONFIG_IOSTANDARD, zynq_iostd_lvcmos18}, >>>>>>> ~ ^~~~~~~~~~~~~~~~~~~~~ >>>>>>> drivers/pinctrl/pinctrl-zynq.c:990:16: warning: implicit conversion from >>>>>>> enumeration type 'enum zynq_pin_config_param' to different enumeration >>>>>>> type 'enum pin_config_param' [-Wenum-conversion] >>>>>>> = { PCONFDUMP(PIN_CONFIG_IOSTANDARD, "IO-standard", NULL, true), >>>>>>> ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>>>>>> ./include/linux/pinctrl/pinconf-generic.h:163:11: note: expanded from >>>>>>> macro 'PCONFDUMP' >>>>>>> .param = a, .display = b, .format = c, .has_arg = d \ >>>>>>> ^ >>>>>>> 2 warnings generated. >>>>>> >>>>>> This is interesting. I have never tried to use llvm for building the >>>>>> kernel. Do you have any description how this can be done? >>>>>> >>>>> >>>>> Depending on what version of Clang you have access to, it is usually just as >>>>> simple as running 'make ARCH=arm CC=clang CROSS_COMPILE=arm-linux-gnueabi-'. >>>>> >>>>> Clang 7.0+ is recommended but 6.0 might work too. >>>> >>>> TBH I would expect to download container and run this there to make sure >>>> that I don't break anything else. >>> >>> This is the first request we've had for a container in order to test a >>> patch. If it comes up again from other folks, I think it makes sense >>> to create one. Until then, its nice to have. It's definitely >>> overkill for this patch. >> >> I have played with it to see that error and here are some steps I did. >> >> docker run --name test-clang -it --rm debian:latest bash >> apt-get update >> apt-get install gcc-arm-linux-gnueabi gcc-aarch64-linux-gnu clang git bc >> build-essential bison flex make llvm vim libssl-dev sparse >> >> git clone >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git --depth 1 >> cd linux >> >> export ARCH=arm64 >> export CROSS_COMPILE=aarch64-linux-gnu- >> >> make defconfig > > This should also have 'CC=clang' because compiler detection happens in > Kconfig now so compiler flags get properly set. Other than that, looks > good and I was able to build pinctrl-zynq.o without any issues with > those commands. For arm32 I am still getting compilation issue (arm64 is fine) Below are my steps and version I use. Do you know what could be the problem? Thanks, Michal root@1e15921e6d15:~/linux# arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (Debian 6.3.0-18) 6.3.0 20170516 Copyright (C) 2016 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. root@1e15921e6d15:~/linux# clang --version clang version 3.8.1-24 (tags/RELEASE_381/final) Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin export ARCH=arm export CROSS_COMPILE=arm-linux-gnuaebi- make CC=clang defconfig make CC=clang drivers/pinctrl/pinctrl-zynq.o and I get clang: error: unsupported argument '-W' to option 'Wa,' scripts/Makefile.build:305: recipe for target 'scripts/mod/empty.o' failed make[2]: *** [scripts/mod/empty.o] Error 1 scripts/Makefile.build:546: recipe for target 'scripts/mod' failed