On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <[email protected]> wrote:
>
> On 11/16/22 14:48, Nick Desaulniers wrote:
> > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <[email protected]> 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-
>
> Setting HOSTCC three times is done by buildroot, it does it through make
> flags, and then variables passed to make etc. clearly we could change
> that, but that's out of scope is not it?
> --
> Florian
>
--
Thanks,
~Nick Desaulniers
On Wed, Nov 16, 2022 at 3:10 PM Nick Desaulniers
<[email protected]> wrote:
>
> On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <[email protected]> wrote:
> >
> > On 11/16/22 14:48, Nick Desaulniers wrote:
> > > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <[email protected]> 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
>
>
> >
> > Setting HOSTCC three times is done by buildroot, it does it through make
> > flags, and then variables passed to make etc. clearly we could change
> > that, but that's out of scope is not it?
> > --
> > Florian
> >
>
>
> --
> Thanks,
> ~Nick Desaulniers
--
Thanks,
~Nick Desaulniers
On 11/16/22 15:11, Nick Desaulniers wrote:
> On Wed, Nov 16, 2022 at 3:10 PM Nick Desaulniers
> <[email protected]> wrote:
>>
>> On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <[email protected]> wrote:
>>>
>>> On 11/16/22 14:48, Nick Desaulniers wrote:
>>>> On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <[email protected]> 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
On Wed, Nov 16, 2022 at 03:16:32PM -0800, Florian Fainelli wrote:
> On 11/16/22 15:11, Nick Desaulniers wrote:
> > On Wed, Nov 16, 2022 at 3:10 PM Nick Desaulniers
> > <[email protected]> wrote:
> > >
> > > On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <[email protected]> wrote:
> > > >
> > > > On 11/16/22 14:48, Nick Desaulniers wrote:
> > > > > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <[email protected]> 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.
What kernel version is this?
If you are not using PATH to control which binaries are being used, you
can use
$ make LLVM=.../
to use .../clang, .../ld.lld, etc (the trailing slash is critical for
this), which will behave similar to CROSS_COMPILE for GCC. When building
with LLVM, CROSS_COMPILE only controls the target triple and it is
unnecessary when using all LLVM tools. That LLVM behavior is relatively
new, see commit e9c281928c24 ("kbuild: Make $(LLVM) more flexible").
Cheers,
Nathan