* Re: kbuild: check the minimum compiler version in Kconfig
@ 2022-11-16 21:48 Florian Fainelli
2022-11-16 22:48 ` Nick Desaulniers
0 siblings, 1 reply; 7+ messages in thread
From: Florian Fainelli @ 2022-11-16 21:48 UTC (permalink / raw)
To: Masahiro Yamada, linux-kernel@vger.kernel.org, Nick Desaulniers
Cc: Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek
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.
It is not clear to me how to best address that, short of not specifying
LLVM=1 on the kernel *config targets, but IMHO there is still an actual
issue where we do not check the compiler that we would want to check.
Thanks!
--
Florian
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: kbuild: check the minimum compiler version in Kconfig 2022-11-16 21:48 kbuild: check the minimum compiler version in Kconfig Florian Fainelli @ 2022-11-16 22:48 ` Nick Desaulniers 2022-11-16 22:56 ` Florian Fainelli 0 siblings, 1 reply; 7+ messages in thread From: Nick Desaulniers @ 2022-11-16 22:48 UTC (permalink / raw) To: Florian Fainelli Cc: Masahiro Yamada, linux-kernel@vger.kernel.org, Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@gmail.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) > > It is not clear to me how to best address that, short of not specifying > LLVM=1 on the kernel *config targets, but IMHO there is still an actual > issue where we do not check the compiler that we would want to check. > > Thanks! > -- > Florian -- Thanks, ~Nick Desaulniers ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: kbuild: check the minimum compiler version in Kconfig 2022-11-16 22:48 ` Nick Desaulniers @ 2022-11-16 22:56 ` Florian Fainelli 2022-11-16 23:10 ` Nick Desaulniers 0 siblings, 1 reply; 7+ messages in thread From: Florian Fainelli @ 2022-11-16 22:56 UTC (permalink / raw) To: Nick Desaulniers Cc: Masahiro Yamada, linux-kernel@vger.kernel.org, Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek On 11/16/22 14:48, Nick Desaulniers wrote: > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@gmail.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. 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: kbuild: check the minimum compiler version in Kconfig 2022-11-16 22:56 ` Florian Fainelli @ 2022-11-16 23:10 ` Nick Desaulniers 2022-11-16 23:11 ` Nick Desaulniers 0 siblings, 1 reply; 7+ messages in thread From: Nick Desaulniers @ 2022-11-16 23:10 UTC (permalink / raw) To: Florian Fainelli Cc: Masahiro Yamada, linux-kernel@vger.kernel.org, Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek, clang-built-linux, Manoj Gupta On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <f.fainelli@gmail.com> wrote: > > On 11/16/22 14:48, Nick Desaulniers wrote: > > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@gmail.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- > > 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: kbuild: check the minimum compiler version in Kconfig 2022-11-16 23:10 ` Nick Desaulniers @ 2022-11-16 23:11 ` Nick Desaulniers 2022-11-16 23:16 ` Florian Fainelli 0 siblings, 1 reply; 7+ messages in thread From: Nick Desaulniers @ 2022-11-16 23:11 UTC (permalink / raw) To: Florian Fainelli Cc: Masahiro Yamada, linux-kernel@vger.kernel.org, Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek, clang-built-linux, Manoj Gupta On Wed, Nov 16, 2022 at 3:10 PM Nick Desaulniers <ndesaulniers@google.com> wrote: > > On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <f.fainelli@gmail.com> wrote: > > > > On 11/16/22 14:48, Nick Desaulniers wrote: > > > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@gmail.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 > > > > > > 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: kbuild: check the minimum compiler version in Kconfig 2022-11-16 23:11 ` Nick Desaulniers @ 2022-11-16 23:16 ` Florian Fainelli 2022-11-16 23:24 ` Nathan Chancellor 0 siblings, 1 reply; 7+ messages in thread From: Florian Fainelli @ 2022-11-16 23:16 UTC (permalink / raw) To: Nick Desaulniers Cc: Masahiro Yamada, linux-kernel@vger.kernel.org, Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek, clang-built-linux, Manoj Gupta On 11/16/22 15:11, Nick Desaulniers wrote: > On Wed, Nov 16, 2022 at 3:10 PM Nick Desaulniers > <ndesaulniers@google.com> wrote: >> >> On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <f.fainelli@gmail.com> wrote: >>> >>> On 11/16/22 14:48, Nick Desaulniers wrote: >>>> On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@gmail.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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: kbuild: check the minimum compiler version in Kconfig 2022-11-16 23:16 ` Florian Fainelli @ 2022-11-16 23:24 ` Nathan Chancellor 0 siblings, 0 replies; 7+ messages in thread From: Nathan Chancellor @ 2022-11-16 23:24 UTC (permalink / raw) To: Florian Fainelli Cc: Nick Desaulniers, Masahiro Yamada, linux-kernel@vger.kernel.org, Paul Gortmaker, Nathan Chancellor, ojeda, sedat.dilek, clang-built-linux, Manoj Gupta 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 > > <ndesaulniers@google.com> wrote: > > > > > > On Wed, Nov 16, 2022 at 2:56 PM Florian Fainelli <f.fainelli@gmail.com> wrote: > > > > > > > > On 11/16/22 14:48, Nick Desaulniers wrote: > > > > > On Wed, Nov 16, 2022 at 1:48 PM Florian Fainelli <f.fainelli@gmail.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. 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-11-16 23:24 UTC | newest] Thread overview: 7+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2022-11-16 21:48 kbuild: check the minimum compiler version in Kconfig Florian Fainelli 2022-11-16 22:48 ` Nick Desaulniers 2022-11-16 22:56 ` Florian Fainelli 2022-11-16 23:10 ` Nick Desaulniers 2022-11-16 23:11 ` Nick Desaulniers 2022-11-16 23:16 ` Florian Fainelli 2022-11-16 23:24 ` Nathan Chancellor
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