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Date: Wed, 28 Mar 2018 04:30:59 -0700
From: Kees Cook <keescook@...omium.org>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: linux-kbuild <linux-kbuild@...r.kernel.org>, Sam Ravnborg <sam@...nborg.org>,
Linus Torvalds <torvalds@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>,
Ulf Magnusson <ulfalizer@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Randy Dunlap <rdunlap@...radead.org>,
"Luis R . Rodriguez" <mcgrof@...nel.org>, Nicolas Pitre <nico@...aro.org>, LKML <linux-kernel@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, Emese Revfy <re.emese@...il.com>
Subject: Re: [PATCH v2 18/21] gcc-plugins: move GCC version check for PowerPC
to Kconfig
On Mon, Mar 26, 2018 at 10:29 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> For PowerPC, GCC 5.2 is the requirement for GCC plugins. Move the
> version check to Kconfig so that the GCC plugin menus will be hidden
> if an older compiler is in use.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Acked-by: Andrew Donnellan <andrew.donnellan@....ibm.com>
> ---
>
> Changes in v2: None
>
> arch/powerpc/Kconfig | 2 +-
> scripts/Makefile.gcc-plugins | 8 --------
> 2 files changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 73ce5dd..b8474c2 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -195,7 +195,7 @@ config PPC
> select HAVE_FTRACE_MCOUNT_RECORD
> select HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_TRACER
> - select HAVE_GCC_PLUGINS
> + select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200
> select HAVE_GENERIC_GUP
> select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
> select HAVE_IDE
> diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
> index b0f9108..25da4c0 100644
> --- a/scripts/Makefile.gcc-plugins
> +++ b/scripts/Makefile.gcc-plugins
> @@ -56,14 +56,6 @@ gcc-plugins-check: FORCE
> ifdef CONFIG_GCC_PLUGINS
> ifeq ($(PLUGINCC),)
> ifneq ($(GCC_PLUGINS_CFLAGS),)
> - # Various gccs between 4.5 and 5.1 have bugs on powerpc due to missing
> - # header files. gcc <= 4.6 doesn't work at all, gccs from 4.8 to 5.1 have
> - # issues with 64-bit targets.
> - ifeq ($(ARCH),powerpc)
> - ifeq ($(call cc-ifversion, -le, 0501, y), y)
> - @echo "Cannot use CONFIG_GCC_PLUGINS: plugin support on gcc <= 5.1 is buggy on powerpc, please upgrade to gcc 5.2 or newer" >&2 && exit 1
I think we should retain the "buggy" note as a comment in Kconfig
since that knowledge isn't obvious just from the GCC_VERSION test.
> - endif
> - endif
> $(Q)$(srctree)/scripts/gcc-plugin.sh --show-error $(HOSTCXX) $(CC) || true
> @echo "Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?" >&2 && exit 1
> endif
> --
> 2.7.4
>
-Kees
--
Kees Cook
Pixel Security
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