linux-kernel - Re: enabling COMPILE_TEST support for GCC plugins in v4.11

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Message-ID: <2680957.ot0HfIkH6p@wuerfel>
Date:   Fri, 09 Dec 2016 11:40:52 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Kees Cook <keescook@...gle.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Randy Dunlap <rdunlap@...radead.org>,
        Olof Johansson <olof@...om.net>,
        Mark Brown <broonie@...nel.org>, info@...nelci.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Next <linux-next@...r.kernel.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Laura Abbott <labbott@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: enabling COMPILE_TEST support for GCC plugins in v4.11

On Thursday, December 8, 2016 11:00:42 AM CET Kees Cook wrote:

> If you have a moment, applying 215e2aa6c024[1] and reverting
> a519167e753e for an allyesconfig/allmodconfig build should let you
> know if things are working correctly with headers installed. If anyone
> sees any problems, please let me know and I can queue up fixes.

Using gcc-4.9.3 or gcc-5.3.1 for an ARM allmodconfig build, I get tons of
errors such as this one:

/git/arm-soc/init/initramfs.c: In function 'error':
/git/arm-soc/init/initramfs.c:50:1: error: unrecognizable insn:
 }
 ^
(insn 26 25 27 5 (set (reg:SI 111 [ local_entropy.243 ])
        (rotatert:SI (reg:SI 116 [ local_entropy.243 ])
            (const_int -30 [0xffffffffffffffe2]))) -1
     (nil))
*** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
Event                            | Plugins
PLUGIN_ATTRIBUTES                | latent_entropy_plugin
PLUGIN_START_UNIT                | latent_entropy_plugin
/git/arm-soc/init/initramfs.c:50:1: internal compiler error: in extract_insn, at recog.c:2202
/git/arm-soc/arch/arm/vfp/vfpmodule.c: In function 'vfp_init':
/git/arm-soc/arch/arm/vfp/vfpmodule.c:824:1: error: unrecognizable insn:
 }
 ^
(insn 138 137 139 17 (set (reg:SI 165 [ local_entropy.93 ])
        (rotatert:SI (reg:SI 150 [ local_entropy.93 ])
            (const_int -9 [0xfffffffffffffff7]))) -1
     (nil))
*** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.

Using gcc-6.1.1 or gcc-7.0.0, everything works fine as far as I
can tell. With some older Ubuntu binary toolchains, I get this one:

In file included from <stdin>:1:0:
/git/arm-soc/scripts/gcc-plugins/gcc-common.h:4:22: fatal error: bversion.h: No such file or directory
compilation terminated.
Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?

and I can't find the packages for the headers (I still get them for
gcc-5, but not older versions). On very old toolchains (e.g. gcc-4.3),
I get this one:

Cannot use CONFIG_GCC_PLUGINS: your gcc version does not support plugins, you should upgrade it to at least gcc 4.5
scripts/Makefile.gcc-plugins:54: recipe for target 'gcc-plugins-check' failed

	Arnd