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From: Kees Cook <keescook@chromium.org>
Date: Tue, 10 Apr 2018 00:00:03 -0700
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Subject: Re: [PATCH v2 20/21] gcc-plugins: enable GCC_PLUGINS for COMPILE_TEST
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-kbuild <linux-kbuild@vger.kernel.org>, Sam Ravnborg <sam@ravnborg.org>,
	Linus Torvalds <torvalds@linux-foundation.org>, Arnd Bergmann <arnd@arndb.de>,
	Ulf Magnusson <ulfalizer@gmail.com>, Thomas Gleixner <tglx@linutronix.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Randy Dunlap <rdunlap@infradead.org>,
	"Luis R . Rodriguez" <mcgrof@kernel.org>, Nicolas Pitre <nico@linaro.org>, LKML <linux-kernel@vger.kernel.org>
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On Mon, Apr 9, 2018 at 11:15 PM, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> Can you explain a bit more about GCC_PLUGIN_RANDSTRUCT_PERFORMANCE?
>
> IIUC, this option reduces the randomization.

Correct: I don't want to do COMPILE_TEST buids with
GCC_PLUGIN_RANDSTRUCT_PERFORMANCE since it is effectively a subset of
the GCC_PLUGIN_RANDSTRUCT possibilities. So, ..._PERFORMANCE shouldn't
be enabled for COMPILE_TEST, as that would reduce the coverage for
buid tests.

-Kees

-- 
Kees Cook
Pixel Security