make kernel with slackware64-current/source/k/build-all-kernels.sh
failed with: "You are building kernel with non-retpoline compiler."
what should I do then?

working OS environment: slackware64-14.2 in virtualbox
source code: slackware64-current
gcc version: gcc (GCC) 5.3.0

details like this:

root@142:/home/jaloo/src/slackware64-current/source/k# ./build-all-kernels.sh

*************************************************
* Building kernels for recipe x86_64...
*************************************************

Using kernel config: /home/jaloo/src/slackware64-current/source/k/kernel-configs/config-generic-4.19.80.x64
Untarring /home/jaloo/src/slackware64-current/source/k/linux-4.19.80.tar.?z in /tmp/package-kernel-source/usr/src...
Making /usr/src/linux symlink...
Copying /home/jaloo/src/slackware64-current/source/k/kernel-configs/config-generic-4.19.80.x64 to .config...
Fixing permissions/ownership...
Making oldconfig...
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
YACC scripts/kconfig/zconf.tab.c
LEX scripts/kconfig/zconf.lex.c
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --oldconfig Kconfig
#
# configuration written to .config
#
Building kernel...
You are building kernel with non-retpoline compiler.
Please update your compiler.
arch/x86/Makefile:315: recipe for target 'checkbin' failed
make: *** [checkbin] Error 1
You are building kernel with non-retpoline compiler.
Please update your compiler.
arch/x86/Makefile:315: recipe for target 'checkbin' failed
make: *** [checkbin] Error 1
mv: cannot stat '/tmp/kernel-source-4.19.80-noarch-1.txz': No such file or directory

Upgrade your slackware64-14.2 with *all* the patch packages in /patches/packages/.

4 members found this post helpful.

Thanks a lot, i upgrade all package.
it works, and i have finish the kernel compilation.

upgrade all package like this:
# uncomment one line about "Slackware64-14.2" from /etc/slackpkg/mirrors
slackpkg update
slackpkg upgrade-all

2 members found this post helpful.

The reference was to your gcc compiler. The older versions of gcc can't build a kernel that is secure against meltdown.

2 members found this post helpful.