Messages in this thread | | | From | Nick Desaulniers <> | Date | Wed, 16 Nov 2022 15:10:59 -0800 | Subject | Re: kbuild: check the minimum compiler version in Kconfig |
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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
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