Hi, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> writes: > On Wed, Nov 16, 2016 at 12:12:53AM +0530, PrasannaKumar Muralidharan wrote: >> >> scripts/kconfig/conf --silentoldconfig Kconfig >> >> CHK include/config/kernel.release >> >> Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong >> >> not supported by compiler >> >> make: *** [prepare-compiler-check] Error 1 >> >> make: *** Waiting for unfinished jobs.... >> > >> > So turn off CONFIG_CC_STACKPROTECTOR_STRONG or upgrade your C compiler. >> >> I turned off CONFIG_CC_STACKPROTECTOR_STRONG and got the following error >> ******************************************************************************************************* >> HOSTCC scripts/basic/fixdep >> HOSTCC scripts/basic/bin2c >> HOSTCC arch/x86/tools/relocs_32.o >> HOSTCC arch/x86/tools/relocs_64.o >> HOSTCC arch/x86/tools/relocs_common.o >> HOSTLD arch/x86/tools/relocs >> CHK include/config/kernel.release >> CHK include/generated/uapi/linux/version.h >> CHK include/generated/utsrelease.h >> CC arch/x86/purgatory/purgatory.o >> AS arch/x86/purgatory/stack.o >> AS arch/x86/purgatory/setup-x86_64.o >> CC arch/x86/purgatory/sha256.o >> AS arch/x86/purgatory/entry64.o >> CC arch/x86/purgatory/string.o >> LD arch/x86/purgatory/purgatory.ro >> BIN2C arch/x86/purgatory/kexec-purgatory.c >> CHK include/generated/timeconst.h >> CC kernel/bounds.s >> kernel/bounds.c:1:0: error: code model kernel does not support PIC mode >> /* >> >> make[1]: *** [kernel/bounds.s] Error 1 >> make: *** [prepare0] Error 2 >> ******************************************************************************************************* >> >> Using gcc 6.2 to compile kernel. gcc works with >> -fstack-protector-strong for a simple test c code. I doubt compiler is >> the problem. Should I make some change to make kernel compile with gcc >> 6.2? Thank you for your quick response. > > This is Ubuntu, right? Build a 64bit kernel and you should be fine, > right now Canonical is shipping a version of gcc that doesn't want to > build the kernel. There's a patch floating around, go bug the Canonical > developers to get it upstream please... > > If not, I don't know, sorry. At least Debian started building toolchains with PIE enabled by default. I've had this problem for a while, actually. I'm building kernels with: $ make CC="gcc -fno-PIE" and everything builds fine. -- balbi
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