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From: vladimir.murzin@arm.com (Vladimir Murzin)
To: linux-arm-kernel@lists.infradead.org
Subject: [question] kernel build fails with O0 gcc optimization flag
Date: Wed, 25 Nov 2015 17:45:40 +0000	[thread overview]
Message-ID: <5655F3C4.2070503@arm.com> (raw)
In-Reply-To: <20151125171229.GA8415@yury-N73SV>

On 25/11/15 17:12, Yury Norov wrote:
> Hi all.
> 
> I changed optimization from O2 to O0 in Makefile:
>         609 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
>         610 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
>         611 else
>         612 KBUILD_CFLAGS   += -O2 <-- here
>         613 endif
> 
> And broke the build. O1 looks fine.
> 
> I tried Ubuntu and Cavium GCC:
>         gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu1) 
>         gcc version 5.2.0 (Cavium Development Version) 
> 
> Kernel is v4.3, defconfig, ARCH=arm64.
> 
> What am I doing wrong?

Related -00 question has been recently discussed in [1]

[1] http://www.spinics.net/lists/arm-kernel/msg435802.html

Cheers
Vladimir

  reply	other threads:[~2015-11-25 17:45 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-25 17:12 [question] kernel build fails with O0 gcc optimization flag Yury Norov
2015-11-25 17:45 ` Vladimir Murzin [this message]
2015-11-25 18:06 ` Russell King - ARM Linux
2015-11-25 19:56   ` Yury Norov

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