From: Ilya Yanok <yanok@emcraft.com>
To: Darren Hart <dvhart@linux.intel.com>
Cc: poky@pokylinux.org
Subject: Re: [PATCH 3/3] u-boot: compile with -O2 on PowerPC
Date: Thu, 10 Feb 2011 02:21:17 +0300 [thread overview]
Message-ID: <4D53216D.4010908@emcraft.com> (raw)
In-Reply-To: <4D52D210.6070905@linux.intel.com>
Hi Darren,
09.02.2011 20:42, Darren Hart wrote:
> This is already disabled in u-boot.inc with the following line:
>
> # GCC 4.5.1 builds unusable binaries using -Os, remove it from OPTFLAGS
> EXTRA_OEMAKE = "CROSS_COMPILE=${TARGET_PREFIX} OPTFLAGS=''"
Yes, sorry, I've useed not up-to-date version of metadata and missed
this fix. But it has to be '-O2' still.
> Resetting OPTFLAGS to '' removes the -Os from the variable in the
> Makefile. This isn't just a PowerPC problem, it also manifested on ARM,
> I believe it is a GCC 4.5.1 issue.
Well, the difference here is that on PowerPC we have -Os option disabled
completely. Wolfgang tried to summarize know gcc bugs and seems like -Os
bugs on ARM and PowerPC have different nature (it looks like bugs on ARM
are already fixed while on the ones PowerPC are not).
Then I think it's a bad idea to remove -Os everywhere: U-Boot really
wants to be built with -Os optimization so we might want to change
optimization level to -O2 only for targets where it's absolutely
required. Actually I was able to build and successfully run U-Boot on
beagleboard with -Os so it doesn't look like it's completely broken on ARM.
Regards, Ilya.
next prev parent reply other threads:[~2011-02-09 23:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-08 20:26 [PATCH 1/3] linux: add LIC_FILES_CHKSUM Ilya Yanok
2011-02-08 20:26 ` [PATCH 2/3] u-boot: " Ilya Yanok
2011-02-09 17:38 ` Darren Hart
2011-02-09 17:42 ` Gary Thomas
2011-02-09 23:02 ` Ilya Yanok
2011-02-09 22:58 ` Ilya Yanok
2011-02-09 23:04 ` Darren Hart
2011-02-09 23:25 ` Ilya Yanok
2011-02-09 23:38 ` Darren Hart
2011-02-09 23:43 ` Ilya Yanok
2011-02-10 0:06 ` Darren Hart
2011-02-10 0:42 ` Richard Purdie
2011-02-08 20:26 ` [PATCH 3/3] u-boot: compile with -O2 on PowerPC Ilya Yanok
2011-02-09 17:42 ` Darren Hart
2011-02-09 18:05 ` Adrian Alonso
2011-02-09 18:40 ` Darren Hart
2011-02-09 18:15 ` Koen Kooi
2011-02-09 18:27 ` Wolfgang Denk
2011-02-09 23:21 ` Ilya Yanok [this message]
2011-02-09 23:34 ` Darren Hart
2011-02-09 23:48 ` Ilya Yanok
2011-02-09 11:26 ` [PATCH 1/3] linux: add LIC_FILES_CHKSUM Richard Purdie
2011-02-09 17:33 ` Darren Hart
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