linux-kernel - Re: cc1plus invoked oom-killer: gfp_mask=0x280da, order=0, oom

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Date:	Fri, 06 Nov 2009 13:21:41 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Dave Korn <dave.korn.cygwin@...glemail.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	gcc@....gnu.org, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...washington.edu>
Subject: Re: cc1plus invoked oom-killer: gfp_mask=0x280da, order=0, oom_adj=0

Dave Korn wrote:
> Justin Mattock wrote:
>
>
>    
>> ==1830== Command: c++ -o jsxml.o -c -DOSTYPE="Linux2.6" -DOSARCH=Linux
>>      
>
>    Ah, you're running it on the "c++" utility and it's reporting the stats for
> that, but how it works is that "c++" (and "gcc", "g++", et al) is just a
> driver, that parses the command line arguments and shells out to the actual
> compiler ("cc1plus"), assembler and linker to get them to do all the work.
>
>    If you add "-v --save-temps" to the c++ invocation, it'll show you the
> separate command lines it executes for the subprograms; the first invocation
> will be of cc1plus, using the -E flag to generate the preprocessed source into
> a .ii file, it's the second invocation you want, the one which uses the
> "-fpreprocessed" flag and names the .ii file as input, which is the one that
> actually then compiles the pre-processed source into assembly.  For fuller
> explanation, see the GCC wiki:
>
> http://gcc.gnu.org/wiki/DebuggingGCC
>
>      cheers,
>        DaveK
>
>
>
>    
o.k. after some reading and some experimenting,
I finally got firefox to compile all the way without a
memory leak..
here's what I found:
using the default .mozconfig I see during compiling there
is a -O3 in the CFLAGS(mozilla default optimization)
When using my optimization I use -O2
by mistake I accidentally forgot to add the -O2 while
tweaking my .mozconfig for a right CFLAGS to use for
debugging, in doing so firefox compiled all the way.

So using a custom CFLAGS in mozconfig and leaving out
-O* works..

Any ideas what might be happening here?

Justin P. Mattock
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