From: Josh Poimboeuf <jpoimboe@redhat.com>
To: kbuild test robot <fengguang.wu@intel.com>
Cc: kbuild-all@01.org, linux-kernel@vger.kernel.org,
Ingo Molnar <mingo@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: arch/x86//kernel/ftrace.c:35:3: error: #error The following combination is not supported: ((compiler missing -mfentry) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR_SIZE
Date: Mon, 17 Apr 2017 08:33:13 -0500 [thread overview]
Message-ID: <20170417133313.ibbt5nmp76xzabf4@treble> (raw)
In-Reply-To: <201704160947.iSmcgQi7%fengguang.wu@intel.com>
On Sun, Apr 16, 2017 at 09:20:50AM +0800, kbuild test robot wrote:
> Hi Josh,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: d5ff0814fda50f0306e102f39640cf5bb76af08e
> commit: 3f135e57a4f76d24ae8d8a490314331f0ced40c5 x86/build: Mostly disable '-maccumulate-outgoing-args'
> date: 2 weeks ago
> config: x86_64-randconfig-s1-04160822 (attached as .config)
> compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
> reproduce:
> git checkout 3f135e57a4f76d24ae8d8a490314331f0ced40c5
> # save the attached .config to linux build tree
> make ARCH=x86_64
>
> All errors (new ones prefixed by >>):
>
> >> arch/x86//kernel/ftrace.c:35:3: error: #error The following combination is not supported: ((compiler missing -mfentry) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR_SIZE
Hi Fengguang,
The error is working as designed. gcc < 4.6.0 doesn't have -mfentry, so
it fails the above check on x86. Can you add a skip rule? It should
skip building the following case:
x86 && ((gcc < 4.6.0) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR_SIZE
--
Josh
next prev parent reply other threads:[~2017-04-17 13:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-16 1:20 kbuild test robot
2017-04-17 13:33 ` Josh Poimboeuf [this message]
2017-04-18 18:52 ` Andi Kleen
2017-04-18 20:19 ` Josh Poimboeuf
2017-04-18 20:25 ` Andi Kleen
2017-04-18 21:44 ` [PATCH] x86/build: convert function graph '-Os' error to warning Josh Poimboeuf
2017-04-19 8:07 ` [tip:x86/urgent] " tip-bot for Josh Poimboeuf
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