linux-kernel - Re: kbuild: check the minimum compiler version in Kconfig

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Date:   Wed, 16 Nov 2022 15:16:32 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Nathan Chancellor <natechancellor@...il.com>, ojeda@...nel.org,
        sedat.dilek@...il.com, clang-built-linux <llvm@...ts.linux.dev>,
        Manoj Gupta <manojgupta@...gle.com>
Subject: Re: kbuild: check the minimum compiler version in Kconfig

On 11/16/22 15:11, Nick Desaulniers wrote:
> On Wed, Nov 16, 2022 at 3:10 PM Nick Desaulniers
> <ndesaulniers@...gle.com> wrote:
>>
>> On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>>>
>>> On 11/16/22 14:48, Nick Desaulniers wrote:
>>>> On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>>>>>
>>>>> Hi Masahiro, Nick,
>>>>>
>>>>> The compiler version check performed with
>>>>> aec6c60a01d3a3170242d6a99372a388e1136dc6 ("kbuild: check the minimum
>>>>> compiler version in Kconfig") can be defeated and prevent running the
>>>>> *config targets if specifying LLVM=1 on the command line, in that way:
>>>>>
>>>>> BR_BINARIES_DIR=/local/users/fainelli/buildroot-llvm/output/arm64/images
>>>>> LLVM=1 LLVM_IAS=1 PKG_CONFIG_PATH="" /usr/bin/make -j49 -C
>>>>> /local/users/fainelli/buildroot-llvm/output/arm64/build/linux-custom
>>>>> HOSTCC="/usr/bin/gcc"
>>>>> HOSTCC="/local/users/fainelli/buildroot-llvm/output/arm64/host/bin/ccache
>>>>> /usr/bin/gcc -O2
>>>>> -I/local/users/fainelli/buildroot-llvm/output/arm64/host/include
>>>>> -DNDEBUG -L/local/users/fainelli/buildroot-llvm/output/arm64/host/lib
>>>>> -Wl,-rpath,/local/users/fainelli/buildroot-llvm/output/arm64/host/lib"
>>>>> ARCH=arm64
>>>>> INSTALL_MOD_PATH=/local/users/fainelli/buildroot-llvm/output/arm64/target
>>>>> CROSS_COMPILE="/local/users/fainelli/buildroot-llvm/output/arm64/host/bin/aarch64-linux-"
>>>>> WERROR=0
>>>>> DEPMOD=/local/users/fainelli/buildroot-llvm/output/arm64/host/sbin/depmod
>>>>> INSTALL_MOD_STRIP=1 HOSTCC="/usr/bin/gcc" menuconfig
>>>>>      UPD     scripts/kconfig/mconf-cfg
>>>>>      HOSTCC  scripts/kconfig/mconf.o
>>>>>      HOSTCC  scripts/kconfig/lxdialog/checklist.o
>>>>>      HOSTCC  scripts/kconfig/lxdialog/inputbox.o
>>>>>      HOSTCC  scripts/kconfig/lxdialog/menubox.o
>>>>>      HOSTCC  scripts/kconfig/lxdialog/textbox.o
>>>>>      HOSTCC  scripts/kconfig/lxdialog/util.o
>>>>>      HOSTCC  scripts/kconfig/lxdialog/yesno.o
>>>>>      HOSTLD  scripts/kconfig/mconf
>>>>> ***
>>>>> *** Compiler is too old.
>>>>> ***   Your Clang version:    10.0.0
>>>>> ***   Minimum Clang version: 10.0.1
>>>>> ***
>>>>> scripts/Kconfig.include:44: Sorry, this compiler is not supported.
>>>>>
>>>>> Here, the compiler check is actually checking the host compiler clang
>>>>> version installed on my Ubuntu 20.04 system, as opposed to the cross
>>>>> compiler clang version that is being used.
>>>>
>>>> LLVM=1 will use `clang` as found by your $PATH.  Where did you express
>>>> to make what the "cross compiler clang version" is? (And why do you
>>>> set HOSTCC three times)
>>>
>>> We are setting CROSS_COMPILE to express the cross compiler clang prefix
>>> to use.
>>
>> Can you try setting CLANG_PREFIX rather than CROSS_COMPILE (to the same value)?
>>
>> CLANG_PREFIX=/local/users/fainelli/buildroot-llvm/output/arm64/host/bin/aarch64-linux-
> 
> sorry, I meant LLVM_PREFIX

Same results unfortunately.
-- 
Florian