Re: commit ("1e860048c53ee gcc-plugins: simplify GCC plugin-dev capability test")

[Dinh Nguyen]

On 1/6/21 5:14 PM, Kees Cook wrote:

On Wed, Jan 06, 2021 at 08:44:58AM -0600, Dinh Nguyen wrote:

Hi Masahiro,

With v5.11-rc1 and commit("1e860048c53ee gcc-plugins: simplify GCC
plugin-dev capability test"), I get this error for my arm socfpga_defconfig
build. I have been building the kernel the same way for many years now. Do
you know what I might be doing wrong?

$ make ARCH=arm CROSS_COMPILE=${CROSS_COMPILE}
   SYNC    include/config/auto.conf.cmd
   SYSHDR  arch/arm/include/generated/uapi/asm/unistd-common.h
   SYSHDR  arch/arm/include/generated/uapi/asm/unistd-oabi.h
   SYSHDR  arch/arm/include/generated/uapi/asm/unistd-eabi.h
   REMOVE  arch/arm/include/generated/asm/mm-arch-hooks.h
   HOSTCXX scripts/gcc-plugins/arm_ssp_per_task_plugin.so
In file included from scripts/gcc-plugins/gcc-common.h:103:0,
                  from scripts/gcc-plugins/arm_ssp_per_task_plugin.c:3:
/home/dinguyen/linux_dev/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/plugin/include/builtins.h:23:10:
fatal error: mpc.h: No such file or directory
#include <mpc.h>
           ^~~~~~~
compilation terminated.
scripts/gcc-plugins/Makefile:47: recipe for target
'scripts/gcc-plugins/arm_ssp_per_task_plugin.so' failed
make[2]: *** [scripts/gcc-plugins/arm_ssp_per_task_plugin.so] Error 1
scripts/Makefile.build:496: recipe for target 'scripts/gcc-plugins' failed
make[1]: *** [scripts/gcc-plugins] Error 2
Makefile:1190: recipe for target 'scripts' failed
make: *** [scripts] Error 2
make: *** Waiting for unfinished jobs....
   UPD     include/config/kernel.release

Thanks,
Dinh

Hi! Thanks for the report. Other folks have also encountered this,
and it appears to be a problem with distro packaging of the gcc plugin
development packages. You'll need to install the GNU multiprecision
libraries ("gmp-devel" on most rpm-based systems, "libgmp-dev" on most
debian systems)[1].

Hopefully that'll work!

Thanks, that worked! I also had to install libmpc-dev as well.

Dinh