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

[Kees Cook]

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!

-Kees

[1] https://lore.kernel.org/lkml/CAHk-=wjjiYjCp61gdAMpDOsUBU-A2hFFKJoVx5VAC7yV4K6WYg@xxxxxxxxxxxxxx/

-- 
Kees Cook