Bug 1566297

Which compiler?

[root@storageqe-16 libfc_test]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC)

on gcc 4.8.5-28.el7 (kernel-3.10.0-862.el7) it works, here is the PASSed result in my beaker job http://beaker-archive.app.eng.bos.redhat.com/beaker-logs/2018/04/24055/2405555/4997438/70142193/TESTOUT.log
the beaker job is https://beaker.engineering.redhat.com/recipes/4997438#task70142188

You have to use gcc-4.8.5-28.el7 or newer; older gccs don't support -mindirect-branch= yet.  Not a bug.

Indeed.

Retpolines are supported in latest RHEL-7.5 gcc:
gcc-4.8.5-28.el7

And in the following z-streams:
gcc-4.8.5-16.el7_4.2
gcc-4.8.5-11.el7_3.1
gcc-4.8.5-4.el7_2.1

Btw. rather than `gcc -v` do `rpm -q gcc` which will show the z-stream suffix too.
You should be able to rebuild the kernel with 4.8.5-16 too, but you need to have
the latest z-stream update.

I'm a bit at loss here, because I see exactly this issue myself on an up-to-date RHEL7.

user@host /usr/src/kernels/3.10.0-862.9.1.el7.x86_64  $ rpm -q redhat-release-server gcc
redhat-release-server-7.5-8.el7.x86_64
gcc-4.8.5-28.el7_5.1.x86_64
user@host /usr/src/kernels/3.10.0-862.9.1.el7.x86_64  $ make
arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Compiler update recommended..  Stop.


I've also tried devtoolset-7:
user@host /usr/src/kernels/3.10.0-862.9.1.el7.x86_64  $ scl enable devtoolset-7
user@host /usr/src/kernels/3.10.0-862.9.1.el7.x86_64  $ rpm -q devtoolset-7-gcc
devtoolset-7-gcc-7.3.1-5.10.el7.x86_64
$ which gcc
/opt/rh/devtoolset-7/root/usr/bin/gcc
$ gcc --version | head -n1
gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
/usr/src/kernels/3.10.0-862.9.1.el7.x86_64  $ make
arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Compiler update recommended..  Stop.

I might do something completely wrong and stupid ... but I'm not able to see my mistake now.

I have the same problem on my Red Hat Enterprise Linux Server 7.5:

[root@r-arch-host11 rshim]# rpm -q gcc
gcc-4.8.5-28.el7.x86_64

[root@r-arch-host11 rshim]# uname -r
3.10.0-862.el7.x86_64

[root@r-arch-host11 rshim]# cat /etc/os-release
NAME="Red Hat Enterprise Linux Server"
VERSION="7.5 (Maipo)"
ID="rhel"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="7.5"
PRETTY_NAME="Red Hat Enterprise Linux Server 7.5 (Maipo)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:7.5:GA:server"
HOME_URL="https://www.redhat.com/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"

REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 7"
REDHAT_BUGZILLA_PRODUCT_VERSION=7.5
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="7.5"

[root@r-arch-host11 rshim]# make -C /lib/modules/`uname -r`/build M=$PWD modules_install
make: Entering directory `/usr/src/kernels/3.10.0-862.el7.x86_64'
arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Compiler update recommended..  Stop.
make: Leaving directory `/usr/src/kernels/3.10.0-862.el7.x86_64'
[root@r-arch-host11 rshim]#

Sorry, my latest comment is irrelevant - this was an installation issue, not compilation.

(In reply to Michael Savisko from comment #10)
> I have the same problem on my Red Hat Enterprise Linux Server 7.5:
> 
> [root@r-arch-host11 rshim]# rpm -q gcc
> gcc-4.8.5-28.el7.x86_64
> 
You need the latest 7.5 z-stream update of gcc: 
gcc-4.8.5-28.el7_5.1.x86_64

I am trying to rebuild kernel-3.10.0-862.9.1.el7.src.rpm with gcc-4.8.5-28.el7_5.1.el7.x86_64 and it seems to build just fine.

When I tried to build the kmod-kvdo package from the src.rpm downloaded using yum, I saw exactly the same error message:

arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Compiler update recommended..  Stop.

I'm using gcc-4.8.5-28.el7_5.1.x86_64 which is retpoline-aware.

(Note that there is no problem building the kernel.)

My issue was somewhere else. Once the build environment was adjusted, there was no error. Sorry for the noise.

Closing again.

@Akemi Yagi @Michael Savisko

Could u please be more specific about the "build environment was adjusted" "this was an installation issue, not compilation."? We are experiencing the same failure on CentOS 7.9 and GCC version is already gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) that supports retpoline and it is the only gcc that has been installed.