[PATCH] gcc-plugins: Disable GCC plugins for compile test builds

[Palmer Dabbelt]

On Mon, 07 Apr 2025 13:57:32 PDT (-0700), broonie at kernel.org wrote:
> In current mainline x86_64 allmodconfig builds done with tuxmake GCC 13
> and GCC 14 toolchains (which are Debian ones packaged up into containers)
> generate ICEs in landlock:
>
> Event                            | Plugins
> PLUGIN_FINISH_TYPE               | randomize_layout_plugin
> PLUGIN_FINISH_DECL               | randomize_layout_plugin
> PLUGIN_ATTRIBUTES                | latent_entropy_plugin randomize_layout_plugin
> PLUGIN_START_UNIT                | latent_entropy_plugin stackleak_plugin
> PLUGIN_ALL_IPA_PASSES_START      | randomize_layout_plugin
> /build/stage/linux/security/landlock/fs.c: In function ‘hook_file_ioctl_common’:
> /build/stage/linux/security/landlock/fs.c:1745:61: internal compiler error: in c
> ount_type_elements, at expr.cc:7075
>  1745 |                         .u.op = &(struct lsm_ioctlop_audit) {
>       |                                                             ^
>
> Arnd bisected this to c56f649646ec ("landlock: Log mount-related
> denials") but that commit is fairly obviously not really at fault here,
> most likely this is an issue in the plugin.  Given how disruptive having
> key configs like this failing let's disable the plugins for compile test
> builds until a fix is found.
>
> Suggested-by: Arnd Bergmann <arnd at arndb.de>
> Signed-off-by: Mark Brown <broonie at kernel.org>
> ---
>  scripts/gcc-plugins/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig
> index e383cda05367..29b03c136165 100644
> --- a/scripts/gcc-plugins/Kconfig
> +++ b/scripts/gcc-plugins/Kconfig
> @@ -7,6 +7,7 @@ config HAVE_GCC_PLUGINS
>
>  menuconfig GCC_PLUGINS
>  	bool "GCC plugins"
> +	depends on !COMPILE_TEST
>  	depends on HAVE_GCC_PLUGINS
>  	depends on CC_IS_GCC
>  	depends on $(success,test -e $(shell,$(CC) -print-file-name=plugin)/include/plugin-version.h)
>
> ---
> base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
> change-id: 20250407-kbuild-disable-gcc-plugins-8701aa609cb3
>
> Best regards,

This one's been biting me too.  It manifests for me on gcc-12 and gcc-13 
(both locally built toolchains off the release branches, cross compiling 
for RISC-V).

Tested-by: Palmer Dabbelt <palmer at rivosinc.com>