From: markus@trippelsdorf.de (Markus Trippelsdorf)
To: linux-arm-kernel@lists.infradead.org
Subject: Build failure with v4.9-rc1 and GCC trunk -- compiler weirdness
Date: Wed, 19 Oct 2016 17:37:46 +0200 [thread overview]
Message-ID: <20161019153746.GA4411@x4> (raw)
In-Reply-To: <20161017183806.GG5601@arm.com>
On 2016.10.17 at 19:38 +0100, Will Deacon wrote:
> Hi all,
>
> I'm seeing an arm64 build failure with -rc1 and GCC trunk, although I
> believe that the new compiler behaviour at the heart of the problem
> has the potential to affect other architectures and other pieces of
> kernel code relying on dead-code elimination to remove deliberately
> undefined functions.
>
> The failure looks like:
>
> | drivers/built-in.o: In function `armada_3700_add_composite_clk':
> |
> | linux/drivers/clk/mvebu/armada-37xx-periph.c:351:
> | undefined reference to `____ilog2_NaN'
> |
> | linux/drivers/clk/mvebu/armada-37xx-periph.c:351:(.text+0xc72e0):
> | relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol
> | `____ilog2_NaN'
> |
> | make: *** [vmlinux] Error 1
>
This is a gcc bug, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72785
--
Markus
WARNING: multiple messages have this Message-ID (diff)
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
peterz@infradead.org, mingo@kernel.org,
ard.biesheuvel@linaro.org, james.greenhalgh@arm.com,
gregory.clement@free-electrons.com, sboyd@codeaurora.org
Subject: Re: Build failure with v4.9-rc1 and GCC trunk -- compiler weirdness
Date: Wed, 19 Oct 2016 17:37:46 +0200 [thread overview]
Message-ID: <20161019153746.GA4411@x4> (raw)
In-Reply-To: <20161017183806.GG5601@arm.com>
On 2016.10.17 at 19:38 +0100, Will Deacon wrote:
> Hi all,
>
> I'm seeing an arm64 build failure with -rc1 and GCC trunk, although I
> believe that the new compiler behaviour at the heart of the problem
> has the potential to affect other architectures and other pieces of
> kernel code relying on dead-code elimination to remove deliberately
> undefined functions.
>
> The failure looks like:
>
> | drivers/built-in.o: In function `armada_3700_add_composite_clk':
> |
> | linux/drivers/clk/mvebu/armada-37xx-periph.c:351:
> | undefined reference to `____ilog2_NaN'
> |
> | linux/drivers/clk/mvebu/armada-37xx-periph.c:351:(.text+0xc72e0):
> | relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol
> | `____ilog2_NaN'
> |
> | make: *** [vmlinux] Error 1
>
This is a gcc bug, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72785
--
Markus
next prev parent reply other threads:[~2016-10-19 15:37 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-17 18:38 Build failure with v4.9-rc1 and GCC trunk -- compiler weirdness Will Deacon
2016-10-17 18:38 ` Will Deacon
2016-10-17 19:43 ` Ard Biesheuvel
2016-10-17 19:43 ` Ard Biesheuvel
2016-10-19 13:35 ` Will Deacon
2016-10-19 13:35 ` Will Deacon
2016-10-19 14:59 ` Ard Biesheuvel
2016-10-19 14:59 ` Ard Biesheuvel
2016-10-19 15:01 ` Ard Biesheuvel
2016-10-19 15:01 ` Ard Biesheuvel
2016-10-19 15:11 ` Arnd Bergmann
2016-10-19 15:11 ` Arnd Bergmann
2016-10-19 15:27 ` Ard Biesheuvel
2016-10-19 15:27 ` Ard Biesheuvel
2016-10-19 15:44 ` Arnd Bergmann
2016-10-19 15:44 ` Arnd Bergmann
2016-10-19 15:32 ` Gregory CLEMENT
2016-10-19 15:32 ` Gregory CLEMENT
2016-10-19 15:58 ` Russell King - ARM Linux
2016-10-19 15:58 ` Russell King - ARM Linux
2016-10-19 15:37 ` Markus Trippelsdorf [this message]
2016-10-19 15:37 ` Markus Trippelsdorf
2016-10-19 15:55 ` Linus Torvalds
2016-10-19 15:55 ` Linus Torvalds
2016-10-19 15:56 ` Markus Trippelsdorf
2016-10-19 15:56 ` Markus Trippelsdorf
2016-10-19 16:00 ` Ard Biesheuvel
2016-10-19 16:00 ` Ard Biesheuvel
2016-10-19 16:01 ` Linus Torvalds
2016-10-19 16:01 ` Linus Torvalds
2016-10-19 16:22 ` Will Deacon
2016-10-19 16:22 ` Will Deacon
2017-02-01 16:58 ` Laura Abbott
2017-02-01 16:58 ` Laura Abbott
2017-02-01 17:36 ` Ard Biesheuvel
2017-02-01 17:36 ` Ard Biesheuvel
2017-02-01 18:19 ` Ard Biesheuvel
2017-02-01 18:19 ` Ard Biesheuvel
2017-02-01 19:04 ` Joe Perches
2017-02-01 19:04 ` Joe Perches
2017-02-01 19:31 ` Ard Biesheuvel
2017-02-01 19:31 ` Ard Biesheuvel
2017-02-01 19:49 ` Joe Perches
2017-02-01 19:49 ` Joe Perches
2017-02-01 19:53 ` Ard Biesheuvel
2017-02-01 19:53 ` Ard Biesheuvel
2017-02-01 20:34 ` Joe Perches
2017-02-01 20:34 ` Joe Perches
2017-02-01 21:11 ` Ard Biesheuvel
2017-02-01 21:11 ` Ard Biesheuvel
2017-02-02 9:02 ` Peter Zijlstra
2017-02-02 9:02 ` Peter Zijlstra
2017-02-01 21:50 ` Laura Abbott
2017-02-01 21:50 ` Laura Abbott
2017-02-02 9:17 ` Ard Biesheuvel
2017-02-02 9:17 ` Ard Biesheuvel
2017-02-02 15:43 ` Laura Abbott
2017-02-02 15:43 ` Laura Abbott
2017-02-02 15:45 ` Ard Biesheuvel
2017-02-02 15:45 ` Ard Biesheuvel
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